CN110708014A - Detection system and method based on photovoltaic bus board - Google Patents
Detection system and method based on photovoltaic bus board Download PDFInfo
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Abstract
A detection system and method based on photovoltaic collector board, including detection circuit one; the first detection circuit is used for detecting the voltage of each photovoltaic solar panel and the current of each photovoltaic solar panel; the second detection circuit is used for detecting the voltage of each bus circuit and the current of each bus circuit; the first detection circuit and the second detection circuit are both connected with a processing device, and the processing device judges whether the fuse state and the photovoltaic solar panel are connected or not through data sent by the first detection circuit and the second detection circuit. The defects that in the prior art, the MCU judges whether the fuse state and the photovoltaic solar panel are connected or not and is influenced by the MPPT formed by the MPP voltage and the MPP current and misjudgment can occur in the process of detecting and judging whether the fuse state and the photovoltaic solar panel are connected or not are effectively overcome by combining other structures and methods.
Description
Technical Field
The invention relates to the technical field of photovoltaics, belongs to the technical field of bus board detection, and particularly relates to a detection system and a detection method based on a photovoltaic bus board.
Background
Photovoltaic: the solar photovoltaic power generation system is a novel power generation system which directly converts solar radiation energy into electric energy by utilizing the photovoltaic effect of a solar cell semiconductor material.
Currently, the solar photovoltaic industry has become one of the emerging industries that are the most concerned in the world today. Photovoltaic power generation is a direct power generation method that uses solar energy and semiconductor electronic devices to effectively absorb solar radiation energy and convert the solar radiation energy into electric energy, and is the mainstream solar power generation method at present. The photovoltaic power generation does not need fuel and gas emission, belongs to the green industry, has the characteristics of no pollution, safety, long service life, simple maintenance, inexhaustible resources, wide resource distribution and the like, is considered as the most important new energy in the 21 st century, and can be widely applied to the fields of spaceflight, communication, energy, agriculture, office facilities, traffic, private residences and the like.
In the solar photovoltaic industry, a photovoltaic inverter is a commonly used device, and the photovoltaic inverter is one of important system balances in a photovoltaic array system and can be used together with general alternating current power supply equipment. The photovoltaic inverter has a special function matched with the photovoltaic array, can convert variable direct-current voltage generated by the photovoltaic solar panel into alternating-current AC with commercial power frequency, and can feed back the alternating-current AC to a commercial power transmission system or supply an off-grid power grid.
The photovoltaic solar panel is a direct supplier of electric energy in the photovoltaic device, so that management of the photovoltaic solar panel is particularly important, and a junction plate is added in the photovoltaic inverter, particularly in a medium-power-group serial photovoltaic inverter, to manage the photovoltaic solar panel.
Specifically, the functions of the bus bar include the following functions:
1. monitoring the voltage and current of each string of photovoltaic solar panels;
2. disconnecting the string of the failed photovoltaic solar panels through the fuse; fuses are connected in series on the positive pole of the photovoltaic solar panel and the negative pole of the photovoltaic solar panel so as to ensure the operation safety of the photovoltaic solar panel.
Simultaneously still need to possess: 3. detecting whether the fuse is damaged;
4. detect the function that photovoltaic solar panel inserted whether.
At present, however, for the functions of detecting whether the fuse is damaged and detecting whether the photovoltaic solar panel is connected mentioned in the above-mentioned 3 and 4, respectively, the voltage and the current before the junction of the positive electrode of the photovoltaic solar panel and the negative electrode of the photovoltaic solar panel are simply collected, and then comparative analysis is performed to detect whether the fuse is damaged and detect whether the photovoltaic solar panel is connected, for example, as follows:
in order to meet the output power requirement of 30KW, the medium-power group string type photovoltaic inverter uses 8 photovoltaic solar panels with the same specification as a power input element, every 4 photovoltaic solar panels in the 8 photovoltaic solar panels are gathered through a collecting plate and divided into two independent collecting circuits, the two independent collecting circuits are respectively used for realizing two independent Maximum Power Point Tracking (MPPT), and then the two collecting circuits are respectively connected into the photovoltaic inverter, so that the generated energy of the photovoltaic inverter is improved. Collecting positive electrodes PV1+, PV2+, PV3+ and PV4+ of the 4-path photovoltaic solar panel into PV + through a collecting plate, and collecting negative electrodes PV1-, PV2-, PV 3-and PV 4-of the 4-path photovoltaic solar panel into PV-; the positive electrodes PV5+, PV6+, PV7+ and PV8+ of the other 4 paths of photovoltaic solar panels are converged into PV + +, and the negative electrodes PV5-, PV6-, PV 7-and PV 8-of the other 4 paths of photovoltaic solar panels are converged into PV- -. And the voltage signal before 8 way photovoltaic solar cell panel's the converge through voltage detection circuit and send into MCU's signal respectively is: v1, V2, V3, V4, V5, V6, V7, V8; the current signal that MCU was sent into through current detection circuit to 8 way photovoltaic solar cell panel's the electric current before converging is respectively: i1, I2, I3, I4, I5, I6, I7, I8; at present, the sampled signals are only sent to the MCU in a processing mode aiming at the signals, and the MCU judges whether the fuse state and the photovoltaic solar panel are connected or not through the signals. The judgment basis is that if the signal value of the current signal of a certain path of photovoltaic solar panel is detected to be less than 1A and the signal value of the voltage signal of the certain path of photovoltaic solar panel is detected to be more than 250V, the fuse is judged to be disconnected; if the current value of the current signal in a certain path of photovoltaic solar panel is detected to be smaller than 1A and the signal value of the voltage signal is detected to be smaller than 100V, the photovoltaic solar panel is judged to be not accessed; and the other conditions are judged to be normal state.
Because MPP voltage and MPP current after the confluence are not considered in the current processing method, because the formation of MPP voltage and MPP current is a dynamic process, MCU can be used for judging whether the fuse state and the photovoltaic solar panel are accessed and influenced by MPPT formed by MPP voltage and MPP current in the dynamic process, and therefore, the condition of misjudgment can be generated in the process of detecting and judging whether the fuse state and the photovoltaic solar panel are accessed.
Disclosure of Invention
In order to solve the problems, the invention provides a detection system based on a photovoltaic bus board and a method thereof, which effectively avoid the defects that in the prior art, an MCU judges whether a fuse state and a photovoltaic solar panel are accessed and is influenced by MPPT formed by MPP voltage and MPP current, and misjudgment can occur in the process of detecting and judging whether the fuse state and the photovoltaic solar panel are accessed.
In order to overcome the defects in the prior art, the invention provides a detection system based on a photovoltaic bus board and a solution of the method thereof, which specifically comprise the following steps:
a detection system based on a photovoltaic bus board comprises a first detection circuit; the first detection circuit is used for detecting the voltage of each photovoltaic solar panel and the current of each photovoltaic solar panel;
the second detection circuit is used for detecting the voltage of each bus circuit and the current of each bus circuit;
the first detection circuit and the second detection circuit are both connected with a processing device, and the processing device judges whether the fuse state and the photovoltaic solar panel are connected or not through data sent by the first detection circuit and the second detection circuit.
The first detection circuit is connected with the photovoltaic solar panel, and the confluence circuit is connected with the second detection circuit;
the processing device is a controller mcu;
and a fuse is connected in series between the anode of each photovoltaic solar panel and the cathode of each photovoltaic solar panel.
The positive electrode of the photovoltaic solar panel and the negative electrode of the photovoltaic solar panel are respectively connected with the positive input end of the differential amplifier of the first detection circuit and the negative input end of the differential amplifier of the first detection circuit, and the output end of the differential amplifier of the first detection circuit is connected with the controller mcu, so that the output end of the differential amplifier of the first detection circuit can output a signal of the front end voltage of the fuse connected with the photovoltaic solar panel to the controller mcu;
the negative electrode of the photovoltaic solar panel is connected with a current sensor of a first detection circuit in series, the current sensor of the first detection circuit is connected with the controller mcu, and the current sensor of the first detection circuit can input a sampled signal of the photovoltaic solar panel to the controller mcu.
And a differential amplifier for amplifying the signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit is connected in series between the current sensor of the first detection circuit and the controller mcu.
The positive electrode of the confluence circuit and the negative electrode of the confluence circuit are respectively connected with the positive input end of a differential amplifier of a second detection circuit and the negative input end of the differential amplifier of the second detection circuit, and the output end of the differential amplifier of the second detection circuit is connected with the controller mcu, so that the output end of the differential amplifier of the second detection circuit can output a signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit to the controller mcu;
the negative electrode of the confluence circuit is connected with a current sensor of a second detection circuit in series, the current sensor of the second detection circuit is connected with the controller mcu, and the current sensor of the second detection circuit can input a sampled signal of the confluence circuit into the controller mcu.
And a differential amplifier for amplifying the signal of the confluence circuit sampled by the current sensor of the second detection circuit is connected in series between the current sensor of the second detection circuit and the controller mcu.
The number of the photovoltaic solar panels is n, each i photovoltaic solar panels form a confluence circuit after passing through a confluence plate, and each confluence circuit is connected to a photovoltaic INVERTER;
wherein n and i are both positive integers and n is greater than i.
The method of the photovoltaic bus board-based detection system comprises the following steps:
step 1: the controller mcu receives signals of the front end voltage of fuses connected with the photovoltaic solar panels and signals of the photovoltaic solar panels sampled by the current sensors of the first detection circuit, which are transmitted by the output ends of the differential amplifiers of the first detection circuit, and simultaneously receives signals of the MPPT voltage of the rear ends of the fuses connected with the confluence circuit and signals of the confluence circuit sampled by the current sensors of the second detection circuit, which are transmitted by the output ends of the differential amplifiers of the second detection circuit in real time, and presets the initial value of the counter to be zero;
step 2: the controller mcu converts the received signals of the front end voltage of the fuse connected with each photovoltaic solar panel and the signals of the photovoltaic solar panel sampled by the current sensor of the first detection circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit, into the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the actual current value of the photovoltaic solar panel respectively, meanwhile, the controller mcu also converts a real-time received signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit and a real signal of the confluence circuit sampled by a current sensor of the second detection circuit, which are transmitted from the output end of the differential amplifier of the second detection circuit, into an actual MPPT voltage value at the rear end of the fuse connected with the confluence circuit and an actual current value of the confluence circuit respectively;
and step 3: the controller mcu compares the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel with the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel;
and 4, step 4: if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is greater than the rear end MPPT voltage value K2 of the fuse connected with the actual confluence circuit corresponding to the actual photovoltaic solar panel and the difference value of subtracting the rear end MPPT voltage value K2 from the front end voltage value K1 is greater than a threshold value one, the controller mcu continuously and synchronously receives signals of the front end voltage of the fuse connected with the photovoltaic solar panel and signals of the rear end MPPT voltage of the fuse connected with the confluence circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit and are transmitted from the output end of the differential amplifier of the second detection circuit for a plurality of times;
and 5: the controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit;
step 6: the controller mcu compares the actual front end voltage value of the fuse connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one;
and 7: if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is larger than the back end MPPT voltage value K2 of the fuse connected with the actual confluence circuit corresponding to the photovoltaic solar panel and the difference value of subtracting the back end MPPT voltage value K2 from the front end voltage value K1 is larger than a threshold value one, the value of the counter is increased by one;
and 8: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of the times of continuously and synchronously receiving the fuses for a plurality of times by the controller mcu in the step 4, judging that the fuses connected with the photovoltaic solar panel are disconnected, displaying the information that the fuses connected with the photovoltaic solar panel are disconnected on the display module, and resetting the value of the counter;
and step 9: in addition, the controller mcu can also judge whether the photovoltaic solar panel is connected.
The controller mcu also can judge whether the photovoltaic solar panel is accessed, and the steps are as follows:
step 9-1: the controller mcu judges the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel;
step 9-2: if the actual rear-end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is zero or the actual front-end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, the controller mcu continuously and synchronously receives signals of the front-end voltage of the fuse connected with the photovoltaic solar panel and signals of the rear-end MPPT voltage of the fuse connected with the confluence circuit, which are transmitted from the output end of the differential amplifier of the detection circuit I and are transmitted for a plurality of times;
step 9-3: the controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit;
step 9-4: the controller mcu judges the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one;
step 9-5: if the real MPPT voltage value K2 of the back end of the fuse connected with the confluence circuit of the photovoltaic solar panel is zero or the real front end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, the value of the counter is increased by one;
and 9-6: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of the times of continuously and synchronously receiving for a plurality of times by the controller mcu in the step 9-2, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter.
The method for judging whether the photovoltaic solar panel is connected or not by the controller mcu can also comprise the following steps:
step 9-A: the controller mcu judges the actual current value of the photovoltaic solar panel, the corresponding actual current value of the confluence circuit, the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel;
step 9-B: if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel minus the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is larger than a set threshold value four, and the corresponding actual current value of the confluence circuit is larger than a set threshold value five, the controller mcu continuously and synchronously receives the signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted by the output end of the differential amplifier of the first detection circuit, the signal of the rear end MPPT voltage of the fuse connected with the confluence circuit transmitted by the output end of the differential amplifier of the second detection circuit and the current sensor of the second detection circuit for sampling A signal of the circuit;
step 9-C: the controller mcu converts the synchronously received signal of the front end voltage of the fuse connected with the photovoltaic solar panel and the signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit, into the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the synchronous actual current value of the photovoltaic solar panel respectively, meanwhile, the controller mcu also converts a synchronously received signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit transmitted by the output end of the differential amplifier of the second detection circuit and a signal of the confluence circuit sampled by the current sensor of the second detection circuit into a synchronous actual value of the MPPT voltage at the rear end of the fuse connected with the confluence circuit and a synchronous actual value of the current of the confluence circuit respectively;
step 9-D: the controller mcu judges the actual front end voltage value of the fuse connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuse connected with the confluence circuit and the synchronous actual current value of the confluence circuit one by one;
step 9-E: if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the front end voltage value K1 of the fuse connected with the photovoltaic solar panel subtracted by the rear end MPPT voltage value K2 of the fuse connected with the confluence circuit is larger than a set threshold value four, and the current value of the synchronous actual confluence circuit is larger than a set threshold value five, the value of the counter is increased by one;
step 9-F: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuses connected with the confluence circuit and the synchronous actual current value of the confluence circuit, if the value of the counter exceeds the preset proportion of the number of times of continuous synchronous receiving of the controller mcu in the step 9-B, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter.
Before the controller mcu in the step 5 and the step 9-3 converts the received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into the actual front end voltage value of the fuse connected with the photovoltaic solar panel, the controller mcu processes the received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit by using a filtering algorithm, and before the controller mcu in the step 5 and the step 9-3 also converts the signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit synchronously received into the synchronized actual back end MPPT voltage value of the fuse connected with the confluence circuit, the controller mcu also processes the received signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit, which is transmitted from the output end of the differential amplifier of the second detection circuit, by using a filtering algorithm;
before the controller mcu in step 9-C converts the synchronously received signal of the front end voltage of the fuse connected to the photovoltaic solar panel and the synchronously received signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit transmitted from the output end of the differential amplifier of the first detection circuit into the actual value of the front end voltage of the fuse connected to the photovoltaic solar panel and the synchronous value of the actual current of the photovoltaic solar panel, respectively, the controller mcu processes the synchronously received signal of the front end voltage of the fuse connected to the photovoltaic solar panel and the synchronously received signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit transmitted from the output end of the differential amplifier of the first detection circuit with a filtering algorithm; in step 9-C, before the controller mcu converts the synchronously received signal of the MPPT voltage at the rear end of the fuse connected to the bus circuit transmitted from the output terminal of the differential amplifier of the second detection circuit and the signal of the bus circuit sampled by the current sensor of the second detection circuit into the synchronous actual MPPT voltage value at the rear end of the fuse connected to the bus circuit and the synchronous actual current value of the bus circuit, the controller mcu performs filtering processing on the synchronously received signal of the MPPT voltage at the rear end of the fuse connected to the bus circuit transmitted from the output terminal of the differential amplifier of the second detection circuit and the signal of the bus circuit sampled by the current sensor of the second detection circuit by using a filtering algorithm.
The invention has the beneficial effects that:
the invention only adds the MPPT voltage and the MPPT current detection device and the MPPT voltage and the MPPT current detection method. More judgment algorithms are added in the modules of the processing device. The accuracy of judgment is greatly improved. The final judgment result of the processing device can be reflected to the display module in real time, the client can see the states of the bus board and the photovoltaic solar panel through the prompt of the display module, when a fault occurs, the problem point can be found only by checking the state display of the display module, and therefore manpower is saved and complex maintenance is carried out. The defect that whether MCU judges whether fuse state and photovoltaic solar panel are connected or not, and whether the fuse state and the photovoltaic solar panel are connected or not can be judged by mistake in the process of detecting and judging whether the fuse state and the photovoltaic solar panel are connected or not, wherein the influence of MPPT formed by MPP voltage and MPP current is effectively avoided in the prior art.
Drawings
Fig. 1 is a block diagram of a photovoltaic bus bar-based detection system of the present invention.
Fig. 2 is a schematic connection diagram of the positive electrode of the first bus circuit according to the first embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating the connection of the positive electrodes of the second bus circuit according to the first embodiment of the present invention.
Fig. 4 is a schematic connection diagram of the negative electrode of the first bus circuit according to the first embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating the connection of the negative electrode of the second bus circuit according to the first embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating connection of positive and negative electrodes of a first photovoltaic solar panel according to a first embodiment of the present invention.
Fig. 7 is a schematic diagram illustrating connection of positive and negative electrodes of a second photovoltaic solar panel according to a first embodiment of the present invention.
Fig. 8 is a schematic diagram illustrating connection of positive and negative electrodes of a photovoltaic solar panel iii according to a first embodiment of the present invention.
Fig. 9 is a schematic diagram illustrating connection of positive and negative electrodes of a photovoltaic solar panel four according to a first embodiment of the present invention.
Fig. 10 is a schematic diagram illustrating connection of positive and negative electrodes of a photovoltaic solar panel according to a first embodiment of the present invention.
Fig. 11 is a schematic diagram illustrating connection of positive and negative electrodes of a photovoltaic solar panel six according to a first embodiment of the present invention.
Fig. 12 is a schematic diagram illustrating connection of positive and negative electrodes of a photovoltaic solar panel according to a first embodiment of the present invention.
Fig. 13 is a schematic diagram illustrating connection of positive and negative electrodes of a photovoltaic solar panel eight according to a first embodiment of the present invention.
Fig. 14 is a schematic diagram illustrating connection of positive and negative electrodes of a first bus circuit according to a first embodiment of the present invention.
Fig. 15 is a schematic diagram illustrating connection between the positive and negative electrodes of the second bus circuit according to the first embodiment of the present invention.
Fig. 16 is a schematic connection diagram of a current sensor nine according to a first embodiment of the present invention.
Fig. 17 is a schematic connection diagram of a current sensor according to a first embodiment of the present invention.
Fig. 18 is a schematic diagram of a photovoltaic inverter according to a first embodiment of the present invention.
Fig. 19 is a schematic diagram of a controller according to a first embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and examples.
As shown in fig. 1 to 19, the photovoltaic bus board-based detection system includes a first detection circuit; the detection circuit I is used for detecting the voltage of each photovoltaic solar panel and the current of each photovoltaic solar panel; the second detection circuit is used for detecting the voltage of each bus circuit and the current of each bus circuit; the first detection circuit and the second detection circuit are both connected with the processing device, and the processing device judges whether the fuse state and the photovoltaic solar panel are connected or not through data sent by the first detection circuit and the second detection circuit. This increases the data sent from the second detection circuit to introduce the MPPT voltage and MPPT current detection, and thus adds a more accurate judgment algorithm to the program of the processing device. The accuracy of judging whether the fuse state and the photovoltaic solar panel are connected is greatly improved. The first detection circuit is connected with the photovoltaic solar panel, and the confluence circuit is connected with the second detection circuit; the processing device is a controller mcu; and a fuse is connected in series between the anode of each photovoltaic solar panel and the cathode of each photovoltaic solar panel. The controller can be an MCU, PLC, single chip, ARM processor, DSP processor, or FPGA processor. The positive electrode of the photovoltaic solar panel and the negative electrode of the photovoltaic solar panel are respectively connected with the positive input end of the differential amplifier of the first detection circuit and the negative input end of the differential amplifier of the first detection circuit, and the output end of the differential amplifier of the first detection circuit is connected with the controller mcu, so that the output end of the differential amplifier of the first detection circuit can output a signal of the front end voltage of the fuse connected with the photovoltaic solar panel to the controller mcu; the negative electrode of the photovoltaic solar panel is connected with the current sensor of the first detection circuit in series, the current sensor of the first detection circuit is connected with the controller mcu, and the current sensor of the first detection circuit can input the sampled signal of the photovoltaic solar panel into the controller mcu. And a differential amplifier for amplifying signals of the photovoltaic solar panel sampled by the current sensor of the first detection circuit is connected in series between the current sensor of the first detection circuit and the controller mcu. Thereby enabling amplification of the signal sampled by the current sensor. The positive electrode of the confluence circuit and the negative electrode of the confluence circuit are respectively connected with the positive input end of a differential amplifier of the second detection circuit and the negative input end of the differential amplifier of the second detection circuit, and the output end of the differential amplifier of the second detection circuit is connected with the controller mcu, so that the output end of the differential amplifier of the second detection circuit can output a signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit to the controller mcu; the negative electrode of the second detection circuit is connected in series with the current sensor of the second detection circuit, the current sensor of the second detection circuit is connected with the controller mcu, and the current sensor of the second detection circuit can input the sampled signal of the second detection circuit into the controller mcu. A differential amplifier for amplifying a signal of a confluence circuit sampled by the current sensor of the second detection circuit is connected in series between the current sensor of the second detection circuit and the controller mcu. Thereby enabling amplification of the signal sampled by the current sensor. The number of the photovoltaic solar panels is n, the specifications of the n photovoltaic solar panels are the same, each i photovoltaic solar panels form a confluence circuit after passing through the confluence plate, and each confluence circuit is connected to a photovoltaic INVERTER; the photovoltaic INVERTER can be a medium power string photovoltaic INVERTER. Wherein n and i are both positive integers and n is greater than i. The controller mcu is connected with a memory and a display module, the memory can be a flash memory or an external memory, and the display module can be a display, a display screen or a liquid crystal screen; the memory comprises a receiving module, a conversion module, a comparison module I, a comparison module II and a comparison module III; the receiving module is used for receiving signals of the front end voltage of the fuse connected with each photovoltaic solar panel and signals of the photovoltaic solar panel sampled by the current sensor of the first detection circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit in a polling mode, and simultaneously, the receiving module is also used for receiving signals of the MPPT voltage of the rear end of the fuse connected with the confluence circuit and signals of the confluence circuit sampled by the current sensor of the second detection circuit, which are transmitted from the output end of the differential amplifier of the second detection circuit in real time; the conversion module is used for converting a received signal of the front end voltage of a fuse connected with each photovoltaic solar panel and a received signal of the photovoltaic solar panel sampled by a current sensor of the first detection circuit, which are transmitted from the output end of a differential amplifier of the first detection circuit, into an actual front end voltage value of the fuse connected with the photovoltaic solar panel and an actual current value of the photovoltaic solar panel respectively, and meanwhile, the conversion module is also used for converting a received signal of the rear end MPPT voltage of a fuse connected with the confluence circuit and a received signal of the confluence circuit sampled by a current sensor of the second detection circuit, which are transmitted from the output end of a differential amplifier of the second detection circuit, into an actual rear end MPPT voltage value of the fuse connected with the confluence circuit and an actual current value of the confluence circuit respectively; the comparison module I is used for comparing a front end voltage value K1 of a fuse connected with an actual photovoltaic solar panel with a rear end MPPT voltage value K2 of the fuse connected with a convergence circuit corresponding to the actual photovoltaic solar panel, and the convergence circuit in the rear end MPPT voltage value of the fuse connected with the convergence circuit corresponding to the actual photovoltaic solar panel is the convergence circuit connected with the photovoltaic solar panel through the convergence plate; if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is larger than the back end MPPT voltage value K2 of the fuse connected with the actual collecting circuit corresponding to the photovoltaic solar panel and the difference value of the front end voltage value K1 minus the back end MPPT voltage value K2 is larger than a threshold value one, wherein the threshold value one can be the minimum value of the difference between the voltage value between the positive electrode and the negative electrode of the actual photovoltaic solar panel when the fuse connected with the photovoltaic solar panel is disconnected and the MPPT voltage value between the positive electrode and the negative electrode of the collecting circuit connected with the photovoltaic solar panel through the collecting circuit for a plurality of times, which are obtained by testing in advance, 200 times, the signal of the front end voltage of the fuse connected with the photovoltaic solar panel and the signal of the back end voltage of the fuse connected with the collecting circuit, which are transmitted from the output ends of the differential amplifiers of the detection circuits one and two times are synchronously received A signal of terminal MPPT voltage; the number of times can be 100 times. Then converting a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converting a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit; comparing the actual front end voltage value of the fuse connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one; if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is larger than the back end MPPT voltage value K2 of the fuse connected with the converging circuit corresponding to the actual photovoltaic solar panel and the difference value of subtracting the back end MPPT voltage value K2 from the front end voltage value K1 is larger than a threshold value one, the value of the counter is added with one; the number of times can be 100 times. After comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of the times of continuous and synchronous receiving for a plurality of times by the controller mcu, the MPPT characteristic is adopted: after a fuse connected with a certain photovoltaic solar panel is disconnected, the voltage value of the front end of the fuse is larger than the actual MPPT voltage value of the rear end of the fuse connected with a confluence circuit, so that the fact that the fuse connected with the photovoltaic solar panel is disconnected is judged, information that the fuse connected with the photovoltaic solar panel is disconnected is displayed on a display module, and the value of a counter is reset; the comparison module II is used for judging the front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the rear end MPPT voltage value K2 of the fuse connected with the convergence circuit corresponding to the photovoltaic solar panel, and the convergence circuit in the rear end MPPT voltage value of the fuse connected with the convergence circuit corresponding to the photovoltaic solar panel is the convergence circuit connected with the photovoltaic solar panel through the convergence plate; if the back-end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the reality of the photovoltaic solar panel is zero or the front-end voltage value K1 of the fuse connected with the photovoltaic solar panel corresponding to the reality is smaller than a preset threshold value II, wherein the threshold value II can be the minimum value of the front-end voltage value K1 of the fuse connected with the photovoltaic solar panel, which is obtained through testing for 200 times in advance and is actually connected with the photovoltaic solar panel when the photovoltaic solar panel is not connected, the signals of the front-end voltage of the fuse connected with the photovoltaic solar panel and transmitted from the output end of the differential amplifier of the detection circuit I and the signals of the back-end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the detection circuit II are continuously and synchronously received for a plurality of times; the number of times can be 100 times. The controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit; then, the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit are judged one by one; if the real MPPT voltage value K2 of the back end of the fuse connected with the confluence circuit of the photovoltaic solar panel is zero or the real front end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, the value of the counter is increased by one; the number of times can be 100 times. After comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of continuous synchronous receiving times, judging that the photovoltaic solar panel is not accessed, displaying information that the photovoltaic solar panel is not accessed on a display module, and resetting the value of the counter; the predetermined ratio can be 70%, and if the number of times is 100 times, that is, if the value of the counter exceeds 100 × 70% — 70%, it can be determined that the photovoltaic solar panel is not connected. The comparison module III is used for judging the actual current value of the photovoltaic solar panel, the corresponding actual current value of the confluence circuit, the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel, the confluence circuit in the actual rear end MPPT voltage value of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is the confluence circuit connected with the photovoltaic solar panel through the confluence plate, and the confluence circuit of the corresponding actual current value of the confluence circuit is the same as the confluence circuit; if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel minus the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is larger than a set threshold value four, and the corresponding actual current value of the confluence circuit is larger than a set threshold value five, the threshold value three can be the minimum value of the actual current value of the photovoltaic solar panel obtained by testing for a plurality of times such as 200 times in advance when the photovoltaic solar panel is not accessed, and the threshold value four can be the difference of the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel obtained by testing for a plurality of times such as 200 times in advance when the photovoltaic solar panel is not accessed, minus the actual rear end voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel The threshold value five can be the maximum value of the current value of the corresponding actual bus circuit when the photovoltaic solar panel is not connected for a number of times, such as 200 times, obtained through testing in advance; continuously and synchronously receiving signals of the voltage of the front end of a fuse connected with the photovoltaic solar panel and transmitted by the output end of a differential amplifier of a first detection circuit for a plurality of times, signals of the MPPT voltage of the rear end of the fuse connected with the confluence circuit and transmitted by the output end of a differential amplifier of a second detection circuit, signals of the MPPT voltage of the rear end of the fuse connected with the confluence circuit and transmitted by the output end of the differential amplifier of the second detection circuit and signals of the confluence circuit sampled by a current sensor of the second detection circuit; the number of times can be 10 times. Then, a synchronously received signal of the front end voltage of the fuse connected with the photovoltaic solar panel and a synchronously received signal of the photovoltaic solar panel, which are transmitted from the output end of the differential amplifier of the first detection circuit, of the photovoltaic solar panel are converted into an actual front end voltage value of the fuse connected with the photovoltaic solar panel and an actual current value of the photovoltaic solar panel, and meanwhile, the controller mcu also converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit and a synchronously received signal of the confluence circuit, which are transmitted from the output end of the differential amplifier of the second detection circuit, of the fuse connected with the confluence circuit and a synchronously received signal of the confluence circuit, which is sampled by the current sensor of the second detection circuit, of the fuse connected with the confluence circuit into an actual back end MPPT voltage value of the fuse connected with the confluence circuit and an actual current value of the confluence circuit; judging the front end voltage value of the fuse connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuse connected with the confluence circuit and the synchronous actual current value of the confluence circuit one by one; if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the front end voltage value K1 of the fuse connected with the photovoltaic solar panel subtracted by the rear end MPPT voltage value K2 of the fuse connected with the confluence circuit is larger than a set threshold value four, and the current value of the synchronous actual confluence circuit is larger than a set threshold value five, the value of the counter is increased by one; the number of times can be 10 times. After comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuses connected with the confluence circuit and the synchronous actual current value of the confluence circuit, if the value of the counter exceeds the preset proportion of the continuous synchronous receiving times of the controller mcu, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter. The predetermined ratio can be 70%, and if the number of times is 10, that is, if the value of the counter exceeds 10 × 70% — 7, it can be determined that the photovoltaic solar panel is not connected.
For example, a first example is illustrated, where n is 8, i is 2, the output power of the photovoltaic INVERTER is 30KW, and the output power of each photovoltaic solar panel is 3.75 KW. The 8 photovoltaic solar panels are respectively a photovoltaic solar panel I, a photovoltaic solar panel II, a photovoltaic solar panel III, a photovoltaic solar panel IV, a photovoltaic solar panel V, a photovoltaic solar panel VI, a photovoltaic solar panel VII and a photovoltaic solar panel VIII; the 2 bus circuits are a first bus circuit and a second bus circuit respectively; the positive pole of the photovoltaic solar panel I, the positive pole of the photovoltaic solar panel II, the positive pole of the photovoltaic solar panel III, the positive pole of the photovoltaic solar panel IV, the positive pole of the photovoltaic solar panel V, the positive pole of the photovoltaic solar panel VI, the positive pole of the photovoltaic solar panel seven and the positive pole of the photovoltaic solar panel eight are respectively positive pole PV1+, positive pole PV2+, positive pole PV3+, positive pole PV4+, positive pole PV5+, positive pole PV6+, positive pole PV7+ and positive pole PV8 +; the negative electrode of the photovoltaic solar panel I, the negative electrode of the photovoltaic solar panel II, the negative electrode of the photovoltaic solar panel III, the negative electrode of the photovoltaic solar panel IV, the negative electrode of the photovoltaic solar panel V, the negative electrode of the photovoltaic solar panel VI, the negative electrode of the photovoltaic solar panel seven and the negative electrode of the photovoltaic solar panel eight are respectively negative electrode one PV1-, negative electrode two PV2-, negative electrode three PV3-, negative electrode four PV4-, negative electrode five PV5-, negative electrode six PV6-, negative electrode seven PV 7-and negative electrode eight PV 8-; the first positive electrode PV1+, the second positive electrode PV2+, the third positive electrode PV3+, the fourth positive electrode PV4+, the fifth positive electrode PV5+, the sixth positive electrode PV6+, the seventh positive electrode PV7+ and the eighth positive electrode PV8+ are respectively connected with one end of the first fuse FSJ1, one end of the second fuse FSJ2, one end of the third fuse FSJ3, one end of the fourth fuse FSJ4, one end of the fifth fuse FSJ7, one end of the sixth fuse FSJ8, one end of the seventh fuse FSJ9 and one end of the eighth fuse FSJ 10; the first negative PV1-, the second negative PV2-, the third negative PV3-, the fourth negative PV4-, the fifth negative PV5-, the sixth negative PV6-, the seventh negative PV 7-and the eighth negative PV 8-are respectively connected with one end of a fuse nine FSJ5, one end of a fuse ten FSJ11, one end of a fuse eleven FSJ13, one end of a fuse twelve FSJ15, one end of a fuse thirteen FSJ6, one end of a fuse fourteen FSJ12, one end of a fuse fifteen FSJ14 and one end of a fuse sixteen FSJ 16; the other end of the first fuse FSJ1, the other end of the second fuse FSJ2, the other end of the third fuse FSJ3 and the other end of the fourth fuse FSJ4 are connected together through a bus board to form a positive electrode PV + of a first bus circuit; the other end of the fuse five FSJ7, the other end of the fuse six FSJ8, the other end of the fuse seven FSJ9 and the other end of the fuse eight FSJ10 are connected together through a bus board to form a positive electrode PV + + of a bus circuit II; the other end of the fuse nine FSJ5, the other end of the fuse ten FSJ11, the other end of the fuse eleven FSJ13 and the other end of the fuse twelve FSJ15 are connected together through a bus board to form a negative electrode PV < - >, of a first bus circuit; the end of the fuse nine FSJ5, the end of the fuse ten FSJ11, the end of the fuse eleven FSJ13 and the end of the fuse twelve FSJ15 are respectively connected in series with a current sensor I HCT1, a current sensor II HCT2, a current sensor III HCT3 and a current sensor IV HCT 4; the other end of the fuse thirteen FSJ6, the other end of the fuse fourteen FSJ12, the other end of the fuse fifteen FSJ14 and the other end of the fuse sixteen FSJ16 are connected together through a bus board to form a negative electrode PV < - >, of a bus circuit II; the end of the fuse thirteen FSJ6, the end of the fuse fourteen FSJ12, the end of the fuse fifteen FSJ14 and the end of the fuse sixteen FSJ16 are respectively connected in series with a current sensor five HCT5, a current sensor six HCT6, a current sensor seven HCT7 and a current sensor eight HCT 8.
The detection circuit comprises a current sensor I HCT1, a current sensor II HCT2, a current sensor III HCT3, a current sensor IV HCT4, a current sensor V HCT5, a current sensor V HCT6, a current sensor seven HCT7, a current sensor eight HCT8, a resistor I RJ24, a resistor II RJ25, a resistor III RJ26, a resistor IV 21, a differential amplifier I UJ2A, a resistor V RJ28, a resistor VI RJ29, a resistor III RJ30, a resistor III RJ39, a resistor III RJ27, a capacitor II CJ5, a resistor IV 41, a resistor III RJ42, a resistor twelve RJ43, a resistor thirteen RJ43, a differential amplifier II J2 43, a resistor IV 43, a resistor fifteen 43, a resistor III RJ43, a resistor IV 43, a resistor III RJ43, a resistor IV 43, a resistor III RJ43, a resistor IV 43, a resistor, Twenty-seven RJ57, three CJ11 capacitors, twenty-eighteen RJ68 resistors twenty-nine RJ69, thirty-three RJ71 resistors thirty-eleven RJ70 resistors, four UJ3D differential amplifiers, thirty-twelve RJ73 resistors thirty-three RJ74 resistors forty-three RJ98 resistors thirty-five RJ76 resistors thirty-sixteen RJ72 resistors four CJ12 resistors thirty-seventeen RJ91 resistors thirty-eight RJ92 resistors thirty-nine RJ93 resistors forty RJ87 resistors, five UJ4C differential amplifiers forty-one RJ96 resistors forty-two RJ97 resistors forty-fifty RJ98 resistors forty-fifty-five RJ99 resistors forty-fifteen 99 resistors fifty-five CJ 99 resistors forty-eight RJ 8472 resistors forty-six RJ110 resistors forty-seven RJ111 resistors forty-eight RJ112 resistors eight RJ123 resistors six UJ 99 differential amplifiers six UJ5 RJ99 resistors fifty-fifty RJ114 resistors 115 RJ115 resistors RJ115 resistors twenty-two RJ119 resistors twenty-two RJ, A resistor fifty-eight RJ123, a differential amplifier seventy UJ5C, a resistor fifty-nine RJ128, a resistor sixty-129, a resistor sixty-one RJ130, a resistor sixty-two RJ131, a resistor sixty-three RJ127, a capacitor seventy CJ19, a resistor sixty-four RJ132, a resistor sixty-five RJ133, a resistor sixty-six RJ134, a resistor sixty-seventeen RJ135, a differential amplifier eighty UJ5D, a resistor one hundred seventy-seventeen RJ83, a resistor sixty-nine RJ138, a resistor seventy-ten RJ139, a resistor seventy-one RJ140, a resistor seventy-two RJ136, a capacitor eighty CJ20, a resistor seventy-thirteen RJ5, a resistor seventy-fourteen RJ6, a resistor seventy-five RJ1, a differential amplifier UJ1A, a resistor seventy-sixteen 9, a resistor seventy-seven-eight RJ3, a capacitor ninety CJ1, a resistor seventy-eight-ten RJ15, a resistor seventy-nine RJ58 16, an eighty-eight RJ, Eighty seven RJ resistor, eleven CJ capacitor, eighty eight RJ resistor, eighty nine RJ resistor, ninety RJ resistor, twelve UJ differential amplifier 3, nineteen RJ resistor, ninety two RJ resistor, twelve CJ capacitor, ninety thirteen RJ resistor, ninety four RJ resistor, one hundred RJ resistor, thirteen UJ differential amplifier 1, one hundred and six RJ resistor, ninety seven RJ resistor, one hundred RJ resistor, fourteen UJ differential amplifier 1, one hundred and six RJ resistor, one hundred and two RJ resistor, fourteen CJ capacitor, one hundred and three RJ resistor, one hundred and four RJ resistor, one hundred and five zero RJ resistor, fifteen UJ differential amplifier 2, one hundred and six RJ resistor, one hundred and seven RJ capacitor, one hundred and eight RJ resistor, nine hundred and nine hundred RJ resistor, ten RJ resistor, sixteen RJ differential amplifier UJ3 resistor, one hundred and eleven RJ resistor, twelve RJ resistor, and twelve R, A resistance one hundred twelve RJ52 and a capacitance sixteen CJ 10; the first positive electrode PV1+ is connected with one end of a first resistor RJ24, the other end of the first resistor RJ24 is connected with one end of a second resistor RJ25, the other end of the second resistor RJ25 is connected with one end of a third resistor RJ26, the other end of the third resistor RJ26 and the positive input end of a first differential amplifier UJ2A are connected with one end of a fourth resistor RJ21, and the other end of the fourth resistor RJ21 is grounded; a negative electrode one PV 1-is connected with one end of a resistor five RJ28, the other end of the resistor five RJ28 is connected with one end of a resistor six RJ29, the other end of the resistor six RJ29 is connected with one end of a resistor seven RJ30, the other end of the resistor seven RJ30 and the negative input end of a differential amplifier one UJ2A are connected with one end of a resistor eight RJ39, the output end of a differential amplifier one UJ2A and one end of a resistor nine RJ27 are connected with the other end of the resistor eight RJ39, the other end of the resistor nine RJ27 and one pole of a capacitor CJ5 are connected with one input port of a controller mcu, the other pole of the capacitor CJ5 is grounded, the resistor nine RJ27 and the capacitor CJ5 form a first filter circuit, and the other end of the resistor nine RJ27 is used as a signal output end of a front end voltage V1 of; the fuses connected with the photovoltaic solar panel I are a fuse I FSJ1 and a fuse II FSJ 5; the positive electrode II PV2+ is connected with one end of a resistor eleven RJ41, the other end of the resistor eleven RJ41 is connected with one end of a resistor eleven RJ42, the other end of the resistor eleven RJ42 is connected with one end of a resistor twelve RJ43, the other end of the resistor twelve RJ43 and the positive input end of a differential amplifier II UJ2D are connected with one end of a resistor thirteen RJ40, and the other end of the resistor thirteen RJ40 is grounded; the negative electrode second PV 2-is connected with one end of a resistor fourteen RJ45, the other end of the resistor fourteen RJ45 is connected with one end of a resistor fifteen RJ46, the other end of the resistor fifteen RJ46 is connected with one end of a resistor sixteen RJ47, the other end of the resistor sixteen RJ47 and the negative input end of a differential amplifier second UJ2D are connected with one end of a resistor seventeen RJ50, the output end of the differential amplifier second UJ2D and one end of a resistor eighteen RJ44 are connected with the other end of a resistor seventeen RJ50, the other end of the resistor eighteen RJ44 and one pole of a capacitor bicJ 8 are connected with an input port II of a controller mcu, the other pole of the capacitor dicJ 8 is grounded, the resistor eighteen RJ44 and the capacitor dicJ 8 form a filter circuit II, and the other end of the resistor eighteen RJ44 is used as a signal; the fuses connected with the photovoltaic solar panel II are a fuse II FSJ2 and a fuse Ten FSJ 11; the anode three PV3+ is connected with one end of a resistor nineteen RJ54, the other end of the resistor nineteen RJ54 is connected with one end of a resistor twenty RJ55, the other end of the resistor twenty RJ55 is connected with one end of a resistor twenty-one RJ56, the other end of the resistor twenty-one RJ56 and the positive input end of a differential amplifier three UJ3C are connected with one end of a resistor twenty-two RJ53, and the other end of the resistor twenty-two RJ53 is grounded; the negative electrode three PV 3-is connected with one end of a resistor twenty three RJ64, the other end of the resistor twenty three RJ64 is connected with one end of a resistor twenty four RJ65, the other end of the resistor twenty four RJ65 is connected with one end of a resistor twenty five RJ66, the other end of the resistor twenty five RJ66 and the negative input end of a differential amplifier three UJ3C are connected with one end of a resistor twenty six RJ67, the output end of the differential amplifier three UJ3C and one end of a resistor twenty seven RJ57 are connected with the other end of a resistor twenty six RJ67, the other end of the resistor twenty seven RJ57 and one pole of a capacitor CJ11 are connected with a third input port of a controller mcu, the other pole of the capacitor tri CJ11 is grounded, the resistor twenty seven RJ57 and the capacitor tri CJ11 form a third filter circuit, and the other end of the resistor twenty seven RJ57 is used as a signal output end of a front V3; fuses connected with the photovoltaic solar panel III are a fuse III FSJ3 and a fuse eleven FSJ 13; the positive electrode four PV4+ is connected with one end of a resistor twenty-eight RJ68, the other end of the resistor twenty-eight RJ68 is connected with one end of a resistor twenty-nine RJ69, the other end of the resistor twenty-nine RJ69 is connected with one end of a resistor thirty-nine RJ71, the other end of the resistor thirty-RJ 71 and the positive input end of a differential amplifier four UJ3D are connected with one end of a resistor thirty-one RJ70, and the other end of the resistor thirty-one RJ70 is grounded; the negative electrode four PV 4-is connected with one end of a resistor thirty-two RJ73, the other end of the resistor thirty-two RJ73 is connected with one end of a resistor thirty-three RJ74, the other end of the resistor thirty-three RJ74 is connected with one end of a resistor forty-three RJ98, the other end of the resistor forty-three RJ98 and the negative input end of a differential amplifier four UJ3D are connected with one end of a resistor thirty-five RJ76, the output end of the differential amplifier four UJ3D and one end of a resistor thirty-six RJ72 are connected with the other end of a resistor thirty-five RJ76, the other end of the resistor thirty-sixteen RJ72 and one pole of a capacitor CJ12 are connected with the input port of the controller mcu in a fourth mode, the other pole of the capacitor tetracJ 12 is grounded, the resistor thirty-six RJ72 and the capacitor tetracJ 12 form a filter circuit in a fourth mode, and the other end of the resistor thirty-sixteen R; fuses connected with the photovoltaic solar panel four are four fuses FSJ4 and twelve fuses FSJ 15; the anode five PV5+ is connected with one end of a resistor thirty-seven RJ91, the other end of the resistor thirty-seven RJ91 is connected with one end of a resistor thirty-eight RJ92, the other end of the resistor thirty-eight RJ92 is connected with one end of a resistor thirty-nine RJ93, the other end of the resistor thirty-nine RJ93 and the positive input end of a differential amplifier five UJ4C are connected with one end of a resistor forty RJ87, and the other end of the resistor forty RJ87 is grounded; the negative electrode five PV 5-is connected with one end of a resistor forty-one RJ96, the other end of the resistor forty-one RJ96 is connected with one end of a resistor forty-two RJ97, the other end of the resistor forty-two RJ97 is connected with one end of a resistor forty-three RJ98, the other end of the resistor forty-three RJ98 and the negative input end of a differential amplifier five UJ4C are connected with one end of a resistor forty-four RJ99, the output end of the differential amplifier five UJ4C and one end of a resistor forty-five RJ94 are connected with the other end of a resistor forty-four RJ99, the other end of the resistor forty-fifteen RJ94 and one pole of a capacitor CJ15 are connected with the input port five of the controller mcu, the other pole of the capacitor fifty CJ15 is grounded, the resistor forty-fifteen RJ94 and the capacitor fifty RJ15 form a filter circuit five, and the other end of the resistor-fifteen RJ94 is; the fuses connected with the photovoltaic solar panel five are a fuse five FSJ7 and a fuse thirteen FSJ 6; the positive electrode six PV6+ is connected with one end of a resistor forty-six RJ110, the other end of the resistor forty-six RJ110 is connected with one end of a resistor forty-seven RJ111, the other end of the resistor forty-seven RJ111 is connected with one end of a resistor forty-eight RJ112, the other end of the resistor forty-eight RJ112 and the positive input end of a differential amplifier six UJ5A are connected with one end of a resistor fifty-eight RJ123, and the other end of the resistor fifty-eight RJ123 is grounded; a cathode six PV 6-is connected with one end of a resistor fifty RJ114, the other end of the resistor fifty RJ114 is connected with one end of a resistor fifty RJ115, the other end of the resistor fifty RJ115 is connected with one end of a resistor fifty two RJ116, the other end of the resistor fifty twelve RJ116 and a negative input end of a differential amplifier six UJ5A are connected with one end of a resistor fifty three RJ119, an output end of the differential amplifier six UJ5A and one end of the resistor fifty four RJ113 are connected with the other end of the resistor fifty three RJ119, the other end of the resistor fifty four RJ113 and one pole of a capacitor six CJ17 are connected with an input port six of a controller mcu, the other pole of the capacitor six CJ17 is grounded, the resistor fifty four RJ113 and the capacitor six CJ17 form a filter circuit six, and the other end of the resistor fifty four RJ113 is used as a signal output end of a front end voltage V6; the fuses connected with the photovoltaic solar panel six are fuses six FSJ8 and a fuse fourteen FSJ 12; the anode seven PV7+ is connected with one end of a resistor fifty-five RJ124, the other end of the resistor fifty-five RJ124 is connected with one end of a resistor fifty-six RJ125, the other end of the resistor fifty-six RJ125 is connected with one end of a resistor fifty-seven RJ126, the other end of the resistor fifty-seventeen RJ126 and the positive input end of a differential amplifier seven UJ5C are connected with one end of a resistor fifty-eight RJ123, and the other end of the resistor fifty-eight RJ123 is grounded; a cathode seven PV 7-is connected with one end of a resistor fifty nine RJ128, the other end of the resistor fifty nine RJ128 is connected with one end of a resistor sixty RJ129, the other end of the resistor sixty RJ129 is connected with one end of a resistor sixty one RJ130, the other end of the resistor sixty one RJ130 and a negative input end of a differential amplifier seven UJ5C are connected with one end of a resistor sixty two RJ131, an output end of a differential amplifier seven UJ5C and one end of a resistor sixty three RJ127 are connected with the other end of the resistor sixty two RJ131, the other end of the resistor sixty three RJ127 and one pole of a capacitor seven CJ19 are connected with an input port seven of the controller mcu, the other pole of the capacitor seven CJ19 is grounded, the resistor sixty three RJ127 and the capacitor seven CJ19 form a filter circuit seven, and the other end of the resistor sixty three RJ127 is used as a signal output end voltage V59; the fuses connected with the photovoltaic solar panel seven are a fuse seven FSJ9 and a fuse fifteen FSJ 14; the anode eight PV8+ is connected with one end of a resistor sixty-four RJ132, the other end of the resistor sixty-four RJ132 is connected with one end of a resistor sixty-five RJ133, the other end of the resistor sixty-five RJ133 is connected with one end of a resistor sixty-six RJ134, the other end of the resistor sixty-six RJ134 and the positive input end of a differential amplifier eight UJ5D are connected with one end of a resistor sixty-seven RJ135, and the other end of the resistor sixty-seven RJ135 is grounded; the negative electrode eight PV 8-is connected with one end of a resistor one hundred seventeen RJ83, the other end of the resistor one hundred seventeen RJ83 is connected with one end of a resistor sixty nine RJ138, the other end of the resistor sixty nine RJ138 is connected with one end of a resistor seventy RJ139, the other end of the resistor seventy RJ139 and the negative input end of a differential amplifier eight UJ5D are connected with one end of a resistor seventy RJ140, the output end of the differential amplifier eight UJ5D and one end of a resistor seventy two RJ136 are connected with the other end of the resistor seventy one RJ140, the other end of the resistor seventy twelve RJ136 and one pole of a capacitor eight CJ20 are connected with the input port eight of the controller mcu, the other pole of the capacitor eight CJ20 is grounded, the resistor seventy two RJ136 and the capacitor eight CJ20 form a filter circuit eight, and the other end of the resistor seventy twelve RJ136 is used as a signal output end; the eight fuses connected with the photovoltaic solar panel are eight fuses FSJ10 and sixteen fuses FSJ 16; the signal output end of the first current sensor HCT1 is connected with one end of a resistor seventy-three RJ5, the grounding end of the first current sensor HCT1 is connected with one end of a resistor seventy-four RJ6, the other end of the resistor seventy-three RJ5 and one end of a resistor seventy-five RJ1 are connected with the positive input end of a differential amplifier nine UJ1A, the other end of the resistor seventy-five RJ1 is grounded, the other end of the resistor seventy-four RJ6, the negative input end of the differential amplifier nine UJ1A and one end of a resistor seventy-six RJ9 are connected, the other end of the, the output end of a difference amplifier nine UJ1A is connected with one end of a resistor seventeen RJ3, the other end of the resistor seventeen RJ3 and one pole of a capacitor nine CJ1 are connected with an input port nine of the controller mcu, the other end of the resistor seventeen RJ3 is used as a signal output end of a current sensor HCT1 sampling signal I1, the other pole of the capacitor nine CJ1 is grounded, and the resistor seventeen RJ3 and the capacitor nine CJ1 form a filter circuit nine; the signal output end of the second HCT2 of the current sensor is connected with one end of a resistor seventy eight RJ15, the grounding end of the second HCT2 of the current sensor is connected with one end of a resistor seventy nine RJ16, the other end of a resistor seventy eight RJ15 and one end of a resistor eighy RJ11 are connected with the positive input end of a differential amplifier ten UJ1C, the other end of a resistor eighy RJ11 is grounded, the other end of a resistor seventy nine RJ16, the negative input end of a differential amplifier ten UJ1C and one end of a resistor eighy one RJ17 are connected, the other end of a resistor eighty one RJ17, an output end of a differential amplifier, namely the differential amplifier, is connected with one end of a resistor, namely eighty-twelve RJ13, the other end of the resistor, namely eighty-twelve RJ13, one pole of a capacitor, namely the capacitor, namely; the signal output end of the current sensor tri-HCT 3 is connected with one end of a resistor eighty-three RJ33, the grounding end of the current sensor tri-HCT 3 is connected with one end of a resistor eighty-four RJ34, the other end of the resistor eighty-three RJ33 and one end of a resistor eighty-five RJ22 are connected with the positive input end of an eleventh UJ2B of a differential amplifier, the other end of the resistor eighty-five RJ22 is grounded, the other end of the resistor eighty-four RJ34, the negative input end of the eleventh UJ2B of the differential amplifier and one end of a resistor eighty-six RJ35, the other end of the resistor, the output end of an eleventh UJ2B of the differential amplifier is connected with one end of a resistor eighty-seven RJ31, the other end of the resistor eighty-seven RJ31 and one pole of an eleventh capacitor CJ6 are connected with an eleventh input port of a controller mcu, the other end of the resistor eighty-seven RJ31 is used as a signal output end of a sampled signal I3 of a current sensor tri HCT3, the other pole of the eleventh capacitor CJ6 is grounded, and the resistor eighty-seven RJ31 and the eleventh capacitor CJ6 form an eleventh filter circuit; the signal output end of the current sensor four HCT4 is connected with one end of a resistor eighty eight RJ58, the grounding end of the current sensor four HCT4 is connected with one end of a resistor eighty nine RJ59, the other end of the resistor eighty eight RJ58, one end of a resistor ninety RJ48 and the positive input end of a differential amplifier twelve UJ3A are connected, the other end of the resistor ninety RJ48 is grounded, the other end of the resistor eighty nine RJ59, the negative input end of the differential amplifier twelve UJ3A and one end of a resistor ninety one RJ60 are connected, the other end of the resistor ninety one RJ60, the output end of a differential amplifier twelve UJ3A is connected with one end of a resistor ninety-two RJ51, the other end of the resistor ninety-two RJ51, one pole of a capacitor twelve CJ9 and the input port twelve of the controller mcu are connected, the other end of the resistor ninety-two RJ51 is used as a signal output end of a current sensor four HCT4 sampling signal I4, the other pole of the capacitor twelve CJ9 is grounded, and the resistor ninety-two RJ51 and the capacitor twelve CJ9 form a filter circuit twelve; the signal output end of the current sensor pentahct 5 is connected with one end of a resistor ninety-three RJ7, the grounding end of the current sensor pentahct 5 is connected with one end of a resistor ninety-four RJ8, the other end of the resistor ninety-three RJ7 and one end of a resistor one hundred RJ12 are connected with the positive input end of a differential amplifier thirteen UJ1B, the other end of the resistor one hundred RJ12 is grounded, the other end of the resistor ninety-four RJ8, the negative input end of the differential amplifier thirteen UJ1B and one end of a resistor one hundred zero six 38 are connected, the other end of the resistor one hundred zero six RJ58, an output end of a differential amplifier thirteen UJ1B is connected with one end of a resistor ninety-seven RJ4, the other end of the resistor ninety-seven RJ4 and one pole of a capacitor thirteen CJ2 are connected with an input port thirteen of a controller mcu, the other end of the resistor ninety-seven RJ4 is used as a signal output end of a current sensor pentaHCT 5 sampling signal I5, the other pole of the capacitor thirteen CJ2 is grounded, and the resistor ninety-seven RJ4 and the capacitor thirteen CJ2 form a filter circuit thirteen; the signal output end of the current sensor six HCT6 is connected with one end of a resistor ninety eight RJ18, the grounding end of the current sensor six HCT6 is connected with one end of a resistor ninety nine RJ19, the other end of the resistor ninety eight RJ18 and one end of a resistor one hundred RJ12 are connected with the positive input end of a differential amplifier fourteen UJ1D, the other end of the resistor one hundred RJ12 is grounded, the other end of the resistor ninety nine RJ19, the negative input end of the differential amplifier fourteen UJ1D and one end of a resistor one hundred zero six RJ38 are connected, the other end of the resistor one hundred zero six RJ38, the output end of a differential amplifier fourteen UJ1D is connected with one end of a resistor one-hundred-two RJ14, the other end of the resistor one-hundred-two RJ14 and one pole of a capacitor fourteen CJ4 are connected with a fourteen input port of a controller mcu, the other end of the resistor one-hundred-two RJ14 is used as a signal output end of a current sensor six HCT6 sampling signal I6, the other pole of the capacitor fourteen CJ4 is grounded, and the resistor one-hundred-two RJ14 and the capacitor fourteen CJ4 form a filter circuit fourteen; the signal output end of a current sensor heptahct 7 is connected with one end of a resistor one-hundred-three RJ36, the grounding end of a current sensor heptahct 7 is connected with one end of a resistor one-hundred-four RJ37, the other end of the resistor one-hundred-three RJ36, one end of a resistor one-hundred-five RJ23 and the positive input end of a differential amplifier fifteen UJ2C, the other end of the resistor one-hundred-zero-five RJ23 is grounded, the other end of the resistor one-hundred-four RJ37, the negative input end of the differential amplifier fifteen UJ2C and one end of the resistor one-hundred-zero-six RJ38 are connected, the other end of the resistor one-hundred-zero-six RJ38, the output end of the differential amplifier fifteen UJ2C and one end of a resistor one-hundred-zero-seven RJ32 are connected, the other end of the resistor one-hundred-seven RJ32, one pole of a capacitor fifteen CJ8 and the input port fifteen of a controller mcu 32, the other end, the resistance one hundred and seven RJ32 and the capacitance fifteen CJ7 form the filter circuit fifteen; the signal output end of the current sensor eight HCT8 is connected with one end of a resistor one hundred and eight RJ61, the grounding end of the current sensor eight HCT8 is connected with one end of a resistor one hundred and nine RJ62, the other end of the resistor one hundred and eight RJ61, one end of a resistor one hundred and ten RJ49 are connected with the positive input end of a differential amplifier sixteen UJ3B, the other end of the resistor one hundred and ten RJ49 is grounded, the other end of the resistor one hundred and nine RJ62, the negative input end of the differential amplifier sixteen UJ3B and one end of a resistor one hundred and eleven RJ63 are connected, the other end of the resistor one hundred and eleven RJ63, the output end of the differential amplifier sixteen UJ3B and one end of a resistor one hundred and twelve RJ52 are connected, the other end of the resistor one hundred and twelve RJ52, one pole of a capacitor sixteen CJ cJ10 and an input port of a controller mcu 52, the other end of the resistor one hundred and twelve RJ52 is used as, the resistor one hundred twelve RJ52 and the capacitor sixteen CJ10 form the filter circuit sixteen. The detection circuit comprises a resistor one hundred and thirteen RJ79, a resistor one hundred and fourteen RJ80, a resistor one hundred and fifteen RJ81, a resistor one hundred and sixteen RJ77, a differential amplifier seventeen UJ4B, a resistor one hundred and seventeen RJ83, a resistor one hundred and eighteen RJ84, a resistor one hundred and nineteen RJ85, a resistor one hundred and twenty RJ95, a resistor one hundred and twenty one RJ82, a capacitor seventeen CJ14, a resistor one hundred and twenty twelve RJ101, a resistor one hundred and twenty three RJ102, a resistor one hundred and twenty four RJ103, a resistor one hundred and twenty five RJ100, a differential amplifier eighteen UJ4D, a resistor one hundred and twenty six RJ105, a resistor one hundred and twenty seven RJ106, a resistor one hundred and twenty eight RJ107, a resistor one hundred and twenty nine RJ117, a resistor one hundred and thirty RJ104, a capacitor eighteen CJ8, a current sensor nine HCT9, a current sensor decaHCT 10, a current sensor A, a thirty-, One hundred thirty five RJ86, nineteen CJ13, one hundred thirty six RJ120, one hundred thirty seven RJ121, one hundred thirty eight RJ109, twenty UJ5B, one hundred thirty nine RJ122, one hundred forty RJ118, and twenty CJ 18; the positive electrode PV + of the first confluence circuit is connected with one end of a resistor one hundred and thirteen RJ79, the other end of the resistor one hundred and thirteen RJ79 is connected with one end of a resistor one hundred and fourteen RJ80, the other end of the resistor one hundred and fourteen RJ80 is connected with one end of a resistor one hundred and fifteen RJ81, the other end of the resistor one hundred and fifteen RJ81 and the positive input end of a differential amplifier seventeen UJ4B are connected with one end of a resistor one hundred and sixteen RJ77, and the other end of the resistor one hundred and sixteen RJ77 is grounded; the negative electrode PV-of the first confluence circuit is connected with one end of a resistor one hundred seventeen RJ83, the other end of the resistor one hundred seventeen RJ83 is connected with one end of a resistor one hundred eighteen RJ84, the other end of the resistor one hundred eighteen RJ84 is connected with one end of a resistor one hundred nineteen RJ85, the other end of the resistor one hundred nineteen RJ85 and the negative input end of a differential amplifier seventeen UJ4B are connected with one end of a resistor one hundred twenty RJ95, and the output end of the differential amplifier seventeen UJ4B, one end of a resistor one hundred twenty one RJ82 is connected with the other end of the resistor one hundred twenty RJ95, the other end of the resistor one hundred twenty one RJ82 and one pole of a capacitor seventeen CJ14 are connected with an input port seventeen of the controller mcu, the other pole of the capacitor seventeen CJ14 is grounded, the resistor one hundred twenty one RJ82 and the capacitor seventeen CJ14 form a filter circuit seventeen, and the other end of the resistor one hundred twenty one RJ82 is used as an output end VmpPT 1 of the rear end MPPT voltage of a fuse connected with the first junction circuit; the positive electrode PV + + of the second confluence circuit is connected with one end of a resistor one hundred twenty two RJ101, the other end of the resistor one hundred twenty two twelve RJ101 is connected with one end of a resistor one hundred twenty three RJ102, the other end of the resistor one hundred twenty three RJ102 is connected with one end of a resistor one hundred twenty four RJ103, the other end of the resistor one hundred twenty four RJ103 and the positive input end of a differential amplifier eighteen UJ4D are connected with one end of a resistor one hundred twenty five RJ100, and the other end of the resistor one hundred twenty five RJ100 is grounded; the negative electrode PV of the second confluence circuit is connected with one end of a resistor one hundred twenty six RJ105, the other end of the resistor one hundred twenty six RJ105 is connected with one end of a resistor one hundred twenty seven RJ106, the other end of the resistor one hundred twenty seven RJ106 is connected with one end of a resistor one hundred twenty eight RJ107, the other end of the resistor one hundred twenty eighteen RJ107 and the negative input end of a differential amplifier eighteen UJ4D are connected with one end of a resistor one hundred twenty nine RJ117, the output end of the differential amplifier eighteen UJ4D, one end of a resistor one hundred thirty RJ104 is connected with the other end of the resistor one hundred twenty nine RJ117, the other end of the resistor one hundred thirty RJ104 and one pole of a capacitor eighteen CJ16 are connected with an input port eighteen of the controller mcu, the other pole of the capacitor eighteen CJ16 is grounded, the resistor one hundred thirty RJ104 and the capacitor eighteen CJ16 form a filter circuit eighteen, and the other end of the resistor one hundred thirty RJ104 is used as an output end VmpPT 2 of rear-end MPPT voltage of a fuse connected with the second bus circuit; the positive pole PV + of the first confluence circuit and the positive pole PV + + of the second confluence circuit are connected with the photovoltaic inverter INVERT, the negative pole PV-of the first confluence circuit is connected with the current sensor nine HCT9 in series and then is connected with the photovoltaic inverter INVERT, and the negative pole PV-of the second confluence circuit is connected with the current sensor ten HCT10 in series and then is connected with the photovoltaic inverter INVERT; the signal output end of the current sensor nine HCT9 is connected with one end of a resistor one hundred thirty-one RJ88, the grounding end of the current sensor nine HCT9 is connected with one end of a resistor one hundred thirty-two RJ89, the other end of the resistor one hundred thirty-one RJ88, one end of the resistor one hundred thirty-three RJ78 and the positive input end of a differential amplifier nineteen UJ4A, the other end of the resistor one hundred thirty-three RJ78 is grounded, the other end of the resistor one hundred thirty-two RJ89, the negative input end of the differential amplifier nineteen UJ4A and one end of the resistor one hundred thirty-four RJ90 are connected, the other end of the resistor one hundred thirty-four RJ90, the output end of the differential amplifier nineteen UJ4A and one end of the resistor one hundred thirty-five RJ86 are connected, the other end of the resistor one hundred thirty-five RJ86, one pole of a capacitor nineteen CJ13 and the input port of a controller mcu is connected, the other end, the other electrode of the capacitor nineteen CJ13 is grounded, and the resistor one hundred thirty five RJ86 and the capacitor nineteen CJ13 form a filter circuit nineteen; a signal output end of the current sensor decahct 10 is connected with one end of a resistor one hundred thirty six RJ120, a ground end of the current sensor decahct 10 is connected with one end of a resistor one hundred thirty seven RJ121, the other end of the resistor one hundred thirty sixteen RJ120, one end of the resistor one hundred thirty eight RJ109 and a positive input end of a differential amplifier twenty UJ5B, the other end of the resistor one hundred thirty eighteen RJ109 is grounded, the other end of the resistor one hundred thirty seven RJ121, a negative input end of the differential amplifier twenty UJ5B and one end of a resistor one hundred thirty nine RJ122 are connected, the other end of the resistor one hundred thirty nine RJ122, an output end of the differential amplifier twenty UJ5B and one end of a resistor one hundred forty RJ118 are connected, the other end of the resistor one hundred forty RJ118, one pole of a capacitor twenty CJ18 and an input port of a controller mcu are connected, and the other end of the resistor forty one hundred, the other pole of the capacitor twenty CJ18 is grounded, and the resistor one hundred forty RJ118 and the capacitor twenty CJ18 form a filter circuit twenty. All the filter circuits can filter the output signals of the differential amplification circuits where the filter circuits are located, unnecessary interference is eliminated, and the accuracy of the output signals is improved.
The method of the detection system based on the photovoltaic bus board comprises the following steps:
step 1: when the photovoltaic inverter enters a normal grid-connected working state, the controller mcu receives signals of the front end voltage of fuses connected with each photovoltaic solar panel and signals of the photovoltaic solar panel sampled by a current sensor of the first detection circuit in a polling mode, which are transmitted by the output end of a differential amplifier of the first detection circuit, and simultaneously receives signals of the MPPT voltage of the rear end of the fuses connected with the confluence circuit and signals of the confluence circuit sampled by the current sensor of the second detection circuit in real time, which are transmitted by the output end of a differential amplifier of the second detection circuit, and presets the initial value of a counter as zero;
step 2: the controller mcu converts the received signals of the front end voltages of the fuses connected with the photovoltaic solar panels and the signals of the photovoltaic solar panels sampled by the current sensors of the first detection circuit into actual values of the front end voltages of the fuses connected with the photovoltaic solar panels and the actual values of the current of the photovoltaic solar panels respectively, and simultaneously converts the signals of the back end MPPT voltages of the fuses connected with the confluence circuit and the signals of the confluence circuit sampled by the current sensors of the second detection circuit into actual values of the back end MPPT voltages of the fuses connected with the confluence circuit and the actual values of the current of the confluence circuit respectively, wherein the signals are received in real time from the output ends of the differential amplifiers of the second detection circuit;
further illustrated by example one, the controller mcu converts the received signal of the front end voltage of the fuse connected to each photovoltaic solar panel transmitted from the output terminal of the differential amplifier of the first detection circuit into the front end voltage value of the fuse connected to the actual photovoltaic solar panel, taking as an example the connection of the differential amplifier UJ2A connected to the positive electrode PV1+ and the negative electrode PV 1-in the first detection circuit, the signal received by the controller mcu as the front end voltage V1 of the fuse connected to the first photovoltaic solar panel is a voltage value obtained by scaling the electromotive force difference between the positive electrode PV1+ and the negative electrode PV 1-by the amplification factor of the differential amplifier UJ2A, which is usually a fraction smaller than 1, and the controller mcu divides the scaled voltage value by the amplification factor to obtain the front end voltage value of the actual fuse connected to the photovoltaic solar panel, the positive PV1+ signal and the negative PV 1-signal are scaled by the differential amplifier UJ2A with the same magnification, the positive PV1+ signal and the negative PV 1-signal are scaled by the differential amplifier UJ2A with the same magnification, the four RJ21 resistance divided by the resistance of the first RJ24, the two RJ25 resistance and the three RJ26 resistance, the eight RJ39 resistance divided by the five RJ28 resistance, the six RJ29 resistance and the seven RJ30 resistance, and the introduction of the differential amplifier UJ2A is to reduce the high voltage between the positive PV1+ and the negative PV 1-signal to the controller mcu voltage, and the other front voltage of the fuse 2 terminal voltage connected to the second PV3 front voltage to the three PV fuse 3 front voltage, The front end voltage V4 of the fuse connected with the photovoltaic solar panel IV, the front end voltage V5 of the fuse connected with the photovoltaic solar panel V, the front end voltage V6 of the fuse connected with the photovoltaic solar panel I, the front end voltage V7 of the fuse connected with the photovoltaic solar panel VII and the front end voltage V8 of the fuse connected with the photovoltaic solar panel VIII are respectively converted into the front end voltage value of the fuse connected with the actual photovoltaic solar panel II, the front end voltage value of the fuse connected with the actual photovoltaic solar panel III, the front end voltage value of the fuse connected with the actual photovoltaic solar panel IV, the front end voltage value of the fuse connected with the actual photovoltaic solar panel V, the front end voltage value of the fuse connected with the actual photovoltaic solar panel VI, the front end voltage value of the fuse connected with the actual photovoltaic solar panel VII and the front end voltage value of the fuse connected with the actual photovoltaic solar panel V The mode of the front end voltage value of eight can be analogized in the same way;
the controller mcu converts the signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit into the actual current value of the photovoltaic solar panel, taking the connection of the current sensor HCT1 connected to the negative electrode PV 1-in the first detection circuit as an example, the controller mcu receives the signal I1 sampled by the current sensor HCT1, which is the voltage value obtained by scaling the electromotive force difference between the signal output terminal of the current sensor HCT1 and the ground terminal of the current sensor HCT1 by the amplification factor of the differential amplifier nine UJ1A, which is usually a factor greater than 1, and divides the scaled voltage value by the amplification factor to obtain the voltage value between the signal output terminal of the actual current sensor HCT1 and the ground terminal of the current sensor HCT1, and then converts the voltage value between the signal output terminal of the actual current sensor HCT1 and the ground terminal of the current sensor HCT1 to obtain the actual voltage value of the hall effect of the current sensor HCT1, and measures the voltage value of the hall effect sensor The obtained actual current value of the first photovoltaic current plate, the signal of the signal output end of the first current sensor HCT1 and the signal of the ground end of the first current sensor HCT1 are amplified by the difference amplifier nine UJ1A in the same way, the signal of the signal output end of the first current sensor HCT1 and the signal of the ground end of the first current sensor HCT1 are amplified by the difference amplifier nine UJ1A in the same way, the amplification factors of the signal output end of the first current sensor HCT1 and the signal of the ground end of the first current sensor HCT1 are respectively the quotient obtained by dividing the resistance value of the seventy-five RJ1 by the resistance value of the seventy-three RJ5 and the quotient obtained by dividing the resistance value of the seventy-six RJ9 by the resistance value of the seventy-four RJ6, and the difference amplifier nine UJ1A is introduced to amplify the weak voltage value between the signal output end of the first current sensor HCT1 and the ground end of the first current sensor, The modes of the actual current value of the third photovoltaic current plate, the actual current value of the fourth photovoltaic current plate, the actual current value of the fifth photovoltaic current plate, the actual current value of the sixth photovoltaic current plate, the actual current value of the seventh photovoltaic current plate and the actual current value of the eighth photovoltaic current plate can be analogized in the same way; the first current sensor, the second current sensor, the third current sensor, the fourth current sensor, the fifth current sensor, the sixth current sensor, the seventh current sensor, the eighth current sensor, the ninth current sensor and the tenth current sensor are all Hall current sensors.
In addition, the controller mcu converts the real-time received signal of the back-end MPPT voltage of the fuse connected to the bus circuit transmitted from the output terminal of the differential amplifier of the second detection circuit into the actual back-end MPPT voltage value of the fuse connected to the bus circuit, taking the connection of the differential amplifier seventeen UJ4B connected to the positive electrode PV + of the first bus circuit and the negative electrode PV-of the first bus circuit in the second detection circuit as an example, the output signal received by the controller mcu as the back-end MPPT voltage of the fuse connected to the first bus circuit is the voltage value obtained by scaling the electromotive force difference between the positive electrode PV + of the first bus circuit and the negative electrode PV-of the first bus circuit by the amplification factor of the differential amplifier seventeen UJ4B, the amplification factor is usually a fraction smaller than 1, and the controller mcu divides the scaled voltage value by the amplification factor to obtain the actual back-end MPPT voltage value of the fuse connected to the first bus circuit, the amplification factor of the signal of the positive PV1+ and the amplification factor of the signal of the negative PV 1-scaled by the differential amplifier seventeen UJ4B are the same, the amplification factor of the signal of the positive PV + of the first bus circuit and the amplification factor of the signal of the negative PV-of the first bus circuit scaled by the differential amplifier seventeen UJ4B is the quotient of the resistance value of the resistor one hundred sixteen RJ77 divided by the resistance value of the resistor one hundred thirteen RJ79, the resistance value of the resistor one hundred fourteen RJ80 and the resistance value of the resistor one hundred fifteen RJ81, and the quotient of the resistance value of the resistor one hundred twenty RJ95 divided by the resistance value of the resistor one hundred seventeen RJ83, the resistance value of the resistor one hundred eighteen RJ84 and the resistance value of the resistor one hundred nineteen RJ85, and the differential amplifier seventeen 4 RJ 4B is introduced for the purpose of reducing the very high voltage value between the positive PV + of the first bus circuit and the negative PV-of the first bus circuit, other modes for obtaining the actual MPPT voltage value of the rear end of the fuse connected with the second confluence circuit can be analogized in the same way;
the controller mcu converts the signal of the bus circuit sampled by the current sensor of the second detection circuit into the actual current value of the bus circuit, taking the connection of the current sensor nine HCT9 connected to the negative electrode PV-of the first bus circuit in the second detection circuit as an example, the controller mcu receives as the current sensor nine HCT1 sampled signal I9 the voltage value of the electromotive force difference between the signal output terminal of the current sensor nine HCT9 and the ground terminal of the current sensor nine HCT nine scaled by the amplification factor of the differential amplifier nineteen UJ4A, the amplification factor is usually a factor larger than 1, the controller mcu divides the scaled voltage value by the amplification factor to obtain the voltage value between the signal output terminal of the actual current sensor nine HCT9 and the ground terminal of the current sensor nine HCT9, and the voltage value between the signal output terminal of the actual current sensor nine HCT9 and the ground terminal of the current sensor nine HCT9 is converted according to the hall effect The current value of the actual first bus circuit, the amplification factors of the signal output end of the current sensor nine HCT9 and the signal of the ground end of the current sensor nine HCT9 scaled by the differential amplifier nineteen UJ4A are the same, the amplification factors of the signal output end of the current sensor nine HCT9 and the signal of the ground end of the current sensor nine HCT9 by the differential amplifier nineteen UJ4A are the quotient of the resistance value of the resistor one hundred thirty-three RJ78 divided by the resistance value of the resistor one hundred thirty-four RJ88 and the quotient of the resistance value of the resistor one hundred thirty-four RJ90 divided by the resistance value of the resistor one hundred thirty-two RJ89, the purpose of introducing the differential amplifier nineteen UJ4A is to amplify the weak voltage value between the signal output end of the current sensor nine HCT9 and the ground end of the current sensor nine HCT to be the voltage value accepted by the controller mcu, and the other ways of obtaining the current value of the actual second bus circuit can be analogized;
and step 3: the controller mcu compares the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel with the rear end MPPT voltage value K2 of the fuse connected with the convergence circuit corresponding to the actual photovoltaic solar panel, and the convergence circuit in the rear end MPPT voltage value of the fuse connected with the convergence circuit corresponding to the actual photovoltaic solar panel is the convergence circuit connected with the photovoltaic solar panel through the convergence plate;
and 4, step 4: if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is greater than the back end MPPT voltage value K2 of the fuse connected with the bus circuit corresponding to the actual photovoltaic solar panel and the difference value of the front end voltage value K1 minus the back end MPPT voltage value K2 is greater than a first threshold value which can be the minimum value of the difference between the voltage value between the positive electrode and the negative electrode of the actual photovoltaic solar panel when the fuse connected with the photovoltaic solar panel is disconnected for a plurality of times such as 200 times and the MPPT voltage value between the positive electrode and the negative electrode of the bus circuit connected with the photovoltaic solar panel through the bus board, which are obtained by testing in advance, the controller mcu continuously and synchronously receives signals of the front end voltage of the fuse connected with the photovoltaic solar panel and signals of the front end voltage of the differential amplifier of the first detection circuit and the signals of the output end of the differential amplifier of the second detection circuit which are transmitted from the output end of the differential amplifier of the first detection circuit A signal of a rear end MPPT voltage of the fuse; the number of times can be 100 times.
And 5: the controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit;
step 6: the controller mcu compares the actual front end voltage value of the fuse connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one;
and 7: if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is larger than the back end MPPT voltage value K2 of the fuse connected with the converging circuit corresponding to the actual photovoltaic solar panel and the difference value of subtracting the back end MPPT voltage value K2 from the front end voltage value K1 is larger than a threshold value one, the value of the counter is added with one; the number of times can be 100 times.
And 8: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of the times of continuous synchronous receiving for a plurality of times by the controller mcu in the step 4, the MPPT characteristic is adopted: after a fuse connected with a certain photovoltaic solar panel is disconnected, the voltage value of the front end of the fuse is larger than the actual MPPT voltage value of the rear end of the fuse connected with a confluence circuit, so that the fact that the fuse connected with the photovoltaic solar panel is disconnected is judged, information that the fuse connected with the photovoltaic solar panel is disconnected is displayed on a display module, and the value of a counter is reset; the predetermined ratio can be 70%, and if the number of times is 100, that is, if the value of the counter exceeds 100 × 70% — 70%, it can be determined that the fuse connected to the photovoltaic solar panel is disconnected. Further illustrated by example one, if the photovoltaic solar panel whose fuse connected to the photovoltaic solar panel has been disconnected is photovoltaic solar panel one, that is to say the fuse connected to photovoltaic solar panel one: fuse one FSJ1 or fuse nine FSJ5 has opened.
And step 9: in addition, the controller mcu can also judge whether the photovoltaic solar panel is connected.
The controller mcu can also judge whether the photovoltaic solar panel is accessed, and the steps are as follows:
step 9-1: the controller mcu judges the front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the back end MPPT voltage value K2 of the fuse connected with the convergence circuit corresponding to the photovoltaic solar panel, and the convergence circuit in the back end MPPT voltage value of the fuse connected with the convergence circuit corresponding to the photovoltaic solar panel is the convergence circuit connected with the photovoltaic solar panel through the convergence board;
step 9-2: if the back end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the reality of the photovoltaic solar panel is zero or the front end voltage value K1 of the fuse connected with the photovoltaic solar panel corresponding to the reality is smaller than a preset threshold value II, the threshold value II can be the minimum value of the front end voltage value K1 of the fuse connected with the photovoltaic solar panel, which is obtained through testing for 200 times in advance and is actually not connected with the photovoltaic solar panel, the controller mcu continuously and synchronously receives the front end voltage signal of the fuse connected with the photovoltaic solar panel and the back end MPPT voltage signal of the fuse connected with the confluence circuit, which are transmitted by the output end of the differential amplifier of the detection circuit I and are transmitted by the output end of the differential amplifier of the detection circuit II for a plurality of times; the number of times can be 100 times.
Step 9-3: the controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit;
step 9-4: the controller mcu judges the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one;
step 9-5: if the real MPPT voltage value K2 of the back end of the fuse connected with the confluence circuit of the photovoltaic solar panel is zero or the real front end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, the value of the counter is increased by one; the number of times can be 100 times.
And 9-6: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of the times of continuously and synchronously receiving the signals for a plurality of times by the controller mcu in the step 9-2, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter. The predetermined ratio can be 70%, and if the number of times is 100 times, that is, if the value of the counter exceeds 100 × 70% — 70%, it can be determined that the photovoltaic solar panel is not connected.
The method for judging whether the photovoltaic solar panel is connected or not by the controller mcu can also comprise the following steps:
step 9-A: the controller mcu judges the actual current value of the photovoltaic solar panel, the corresponding actual current value of the confluence circuit, the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel, the confluence circuit in the actual rear end MPPT voltage value of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is the confluence circuit connected with the photovoltaic solar panel through the confluence plate, and the confluence circuit of the corresponding actual current value of the confluence circuit is the same as the confluence circuit;
step 9-B: if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel minus the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is larger than a set threshold value four, and the corresponding actual current value of the confluence circuit is larger than a set threshold value five, the threshold value three can be the minimum value of the actual current value of the photovoltaic solar panel obtained by testing for a plurality of times such as 200 times in advance when the photovoltaic solar panel is not accessed, and the threshold value four can be the difference of the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel obtained by testing for a plurality of times such as 200 times in advance when the photovoltaic solar panel is not accessed, minus the actual rear end voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel The threshold value five can be the maximum value of the current value of the corresponding actual bus circuit when the photovoltaic solar panel is not connected for a number of times, such as 200 times, obtained through testing in advance; the controller mcu continuously and synchronously receives signals of the front end voltage of the fuse connected with the photovoltaic solar panel and transmitted by the output end of the differential amplifier of the first detection circuit, signals of the back end MPPT voltage of the fuse connected with the confluence circuit and transmitted by the output end of the differential amplifier of the second detection circuit and signals of the confluence circuit sampled by the current sensor of the second detection circuit; the number of times can be 10 times.
Step 9-C: the controller mcu respectively converts a signal of the front end voltage of a fuse connected with the photovoltaic solar panel and a signal of the photovoltaic solar panel, which are transmitted from the output end of the differential amplifier of the first detection circuit and are synchronously received, into an actual front end voltage value of the fuse connected with the photovoltaic solar panel and a synchronous actual current value of the photovoltaic solar panel, and simultaneously converts a signal of the rear end MPPT voltage of the fuse connected with the confluence circuit and a signal of the confluence circuit, which is transmitted from the output end of the differential amplifier of the second detection circuit and is synchronously received, into an actual rear end MPPT voltage value of the fuse connected with the confluence circuit and a synchronous actual current value of the confluence circuit, which are synchronously received;
step 9-D: the controller mcu judges the actual front end voltage value of the fuse connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuse connected with the confluence circuit and the synchronous actual current value of the confluence circuit one by one;
step 9-E: if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the front end voltage value K1 of the fuse connected with the photovoltaic solar panel subtracted by the rear end MPPT voltage value K2 of the fuse connected with the confluence circuit is larger than a set threshold value four, and the current value of the synchronous actual confluence circuit is larger than a set threshold value five, the value of the counter is increased by one; the number of times can be 10 times.
Step 9-F: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuses connected with the confluence circuit and the synchronous actual current value of the confluence circuit, if the value of the counter exceeds the preset proportion of the number of times of continuous synchronous receiving of the controller mcu in the step 9-B, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on a display module, and resetting the value of the counter. The predetermined ratio can be 70%, and if the number of times is 10, that is, if the value of the counter exceeds 10 × 70% — 7, it can be determined that the photovoltaic solar panel is not connected.
Before the controller mcu in the step 5 and the step 9-3 converts the signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into the actual front end voltage value of the fuse connected with the photovoltaic solar panel, the controller mcu processes the signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit by using a filter algorithm, and before the controller mcu in the step 5 and the step 9-3 also converts the signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into the actual back end MPPT voltage value of the fuse connected with the confluence circuit, the signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit is converted by the controller mcu Signals of MPPT voltage at the rear end of the fuse connected with the circuit are processed by a filtering algorithm;
before the controller mcu in step 9-C converts the synchronously received signal of the front end voltage of the fuse connected to the photovoltaic solar panel and the signal of the photovoltaic solar panel sampled by the current sensor of the detection circuit one, which are transmitted from the output end of the differential amplifier of the detection circuit one, into the actual front end voltage value of the fuse connected to the photovoltaic solar panel and the synchronous actual current value of the photovoltaic solar panel, respectively, the controller mcu processes the synchronously received signal of the front end voltage of the fuse connected to the photovoltaic solar panel and the signal of the photovoltaic solar panel sampled by the current sensor of the detection circuit one, which are transmitted from the output end of the differential amplifier of the detection circuit one, with a filtering algorithm; before the controller mcu in step 9-C converts the synchronously received signal of the MPPT voltage at the rear end of the fuse connected to the bus circuit transmitted from the output terminal of the differential amplifier of the second detection circuit and the signal of the bus circuit sampled by the current sensor of the second detection circuit into the synchronous actual MPPT voltage value at the rear end of the fuse connected to the bus circuit and the synchronous actual current value of the bus circuit, respectively, the controller mcu performs filtering processing on the synchronously received signal of the MPPT voltage at the rear end of the fuse connected to the bus circuit transmitted from the output terminal of the differential amplifier of the second detection circuit and the signal of the bus circuit sampled by the current sensor of the second detection circuit by using a filtering algorithm. Such filtering can remove interference of noise signals and improve the accuracy of the obtained signals.
The present invention has been described in an illustrative manner by the embodiments, and it should be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, but is capable of various changes, modifications and substitutions without departing from the scope of the present invention.
Claims (10)
1. A detection system based on a photovoltaic bus board comprises a first detection circuit; the first detection circuit is used for detecting the voltage of each photovoltaic solar panel and the current of each photovoltaic solar panel;
the device is characterized by further comprising a second detection circuit, wherein the second detection circuit is used for detecting the voltage of each bus circuit and the current of each bus circuit;
the first detection circuit and the second detection circuit are both connected with a processing device, and the processing device judges whether the fuse state and the photovoltaic solar panel are connected or not through data sent by the first detection circuit and the second detection circuit.
2. The photovoltaic bus board-based detection system according to claim 1, wherein the first detection circuit is connected with a photovoltaic solar panel, and the second detection circuit is connected with the first bus circuit;
the processing device is a controller mcu;
and a fuse is connected in series between the anode of each photovoltaic solar panel and the cathode of each photovoltaic solar panel.
3. The photovoltaic bus board-based detection system according to claim 1, wherein the positive electrode of the photovoltaic solar panel and the negative electrode of the photovoltaic solar panel are respectively connected with the positive input end of the first detection circuit differential amplifier and the negative input end of the first detection circuit differential amplifier, the output end of the first detection circuit differential amplifier is connected with the controller mcu, and thus the output end of the first detection circuit differential amplifier can output a signal of the front end voltage of the fuse connected with the photovoltaic solar panel to the controller mcu;
the negative electrode of the photovoltaic solar panel is connected with a current sensor of a first detection circuit in series, the current sensor of the first detection circuit is connected with the controller mcu, and the current sensor of the first detection circuit can input a sampled signal of the photovoltaic solar panel to the controller mcu.
4. The photovoltaic bus board-based detection system according to claim 1, wherein a differential amplifier for amplifying the signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit is connected in series between the current sensor of the first detection circuit and the controller mcu.
5. The photovoltaic bus board-based detection system according to claim 1, wherein the positive electrode of the bus circuit and the negative electrode of the bus circuit are respectively connected with the positive input end of the differential amplifier of the second detection circuit and the negative input end of the differential amplifier of the second detection circuit, the output end of the differential amplifier of the second detection circuit is connected with the controller mcu, and thus the output end of the differential amplifier of the second detection circuit can output a signal of the back-end MPPT voltage of the fuse connected with the bus circuit to the controller mcu;
the negative electrode of the confluence circuit is connected with a current sensor of a second detection circuit in series, the current sensor of the second detection circuit is connected with the controller mcu, and the current sensor of the second detection circuit can input a sampled signal of the confluence circuit into the controller mcu.
6. The photovoltaic bus board-based detection system according to claim 1, wherein a differential amplifier for amplifying the signal of the bus circuit sampled by the current sensor of the second detection circuit is connected in series between the current sensor of the second detection circuit and the controller mcu;
the number of the photovoltaic solar panels is n, each i photovoltaic solar panels form a confluence circuit after passing through a confluence plate, and each confluence circuit is connected to a photovoltaic INVERTER;
wherein n and i are both positive integers and n is greater than i;
the controller mcu is connected with a memory and a display module, wherein the memory comprises a receiving module, a conversion module, a comparison module I, a comparison module II and a comparison module III;
the receiving module is used for receiving signals of the front end voltage of the fuse connected with each photovoltaic solar panel and signals of the photovoltaic solar panel sampled by the current sensor of the first detection circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit, and simultaneously, the receiving module is also used for receiving signals of the MPPT voltage of the rear end of the fuse connected with the confluence circuit and signals of the confluence circuit sampled by the current sensor of the second detection circuit, which are transmitted from the output end of the differential amplifier of the second detection circuit in real time;
the conversion module is used for converting the received signals of the front end voltage of the fuses connected with the photovoltaic solar panels and the signals of the photovoltaic solar panels sampled by the current sensors of the first detection circuit, which are transmitted from the output ends of the differential amplifiers of the first detection circuit, into the actual front end voltage values of the fuses connected with the photovoltaic solar panels and the actual current values of the photovoltaic solar panels respectively, the conversion module is also used for respectively converting a real-time received signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit and a real signal of the confluence circuit sampled by a current sensor of the detection circuit II, which are transmitted from the output end of the differential amplifier of the detection circuit II, into a real MPPT voltage value at the rear end of the fuse connected with the confluence circuit and a real current value of the confluence circuit;
the comparison module I is used for comparing the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel with the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel; if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is greater than the rear end MPPT voltage value K2 of the fuse connected with the actual confluence circuit corresponding to the photovoltaic solar panel and the difference value of subtracting the rear end MPPT voltage value K2 from the front end voltage value K1 is greater than a threshold value one, continuously and synchronously receiving signals of the front end voltage of the fuse connected with the photovoltaic solar panel and signals of the rear end MPPT voltage of the fuse connected with the confluence circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit and are transmitted from the output end of the differential amplifier of the second detection circuit for a plurality of times; then converting a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converting a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit; comparing the actual front end voltage value of the fuse connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one; if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is larger than the back end MPPT voltage value K2 of the fuse connected with the actual confluence circuit corresponding to the photovoltaic solar panel and the difference value of subtracting the back end MPPT voltage value K2 from the front end voltage value K1 is larger than a threshold value one, the value of the counter is increased by one; after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds a preset proportion of the number of times of continuous synchronous receiving of the controller mcu, judging that the fuses connected with the photovoltaic solar panel are disconnected, displaying information that the fuses connected with the photovoltaic solar panel are disconnected on the display module, and resetting the value of the counter;
the comparison module II is used for judging the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel; if the actual rear-end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is zero or the actual front-end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, continuously and synchronously receiving signals of the front-end voltage of the fuse connected with the photovoltaic solar panel and signals of the rear-end MPPT voltage of the fuse connected with the confluence circuit, which are transmitted from the output end of the differential amplifier of the detection circuit I and the output end of the differential amplifier of the detection circuit II for a plurality of times; the controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit; then, the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit are judged one by one; if the real MPPT voltage value K2 of the back end of the fuse connected with the confluence circuit of the photovoltaic solar panel is zero or the real front end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, the value of the counter is increased by one; after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of continuous synchronous receiving times, judging that the photovoltaic solar panel is not accessed, displaying information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter;
the comparison module III is used for judging the actual current value of the photovoltaic solar panel, the corresponding actual current value of the confluence circuit, the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel; if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel minus the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is larger than a set threshold value four, and the corresponding actual current value of the confluence circuit is larger than a set threshold value five, continuously and synchronously receiving signals of the front end voltage of the fuse connected with the photovoltaic solar panel and transmitted by the output end of the differential amplifier of the first detection circuit, signals of the rear end MPPT voltage of the fuse connected with the confluence circuit and transmitted by the output end of the differential amplifier of the second detection circuit for a plurality of times, signals of the rear end MPPT voltage of the fuse connected with the confluence circuit and transmitted by the output end of the differential amplifier of the second detection circuit, and signals of the confluence circuit sampled by the current sensor of the second detection circuit; then, the synchronously received signal of the front end voltage of the fuse connected with the photovoltaic solar panel and the signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit, are respectively converted into an actual front end voltage value of the fuse connected with the photovoltaic solar panel and a synchronous actual current value of the photovoltaic solar panel, meanwhile, the controller mcu also converts a synchronously received signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit transmitted by the output end of the differential amplifier of the second detection circuit and a signal of the confluence circuit sampled by the current sensor of the second detection circuit into a synchronous actual value of the MPPT voltage at the rear end of the fuse connected with the confluence circuit and a synchronous actual value of the current of the confluence circuit respectively; judging the front end voltage value of the fuse connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuse connected with the confluence circuit and the synchronous actual current value of the confluence circuit one by one; if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the front end voltage value K1 of the fuse connected with the photovoltaic solar panel subtracted by the rear end MPPT voltage value K2 of the fuse connected with the confluence circuit is larger than a set threshold value four, and the current value of the synchronous actual confluence circuit is larger than a set threshold value five, the value of the counter is increased by one; after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuses connected with the confluence circuit and the synchronous actual current value of the confluence circuit, if the value of the counter exceeds the preset proportion of the continuous and synchronous receiving times of the controller mcu, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter.
7. A method of a photovoltaic bus board-based detection system is characterized by comprising the following steps:
step 1: the controller mcu receives signals of the front end voltage of fuses connected with the photovoltaic solar panels and signals of the photovoltaic solar panels sampled by the current sensors of the first detection circuit, which are transmitted by the output ends of the differential amplifiers of the first detection circuit, and simultaneously receives signals of the MPPT voltage of the rear ends of the fuses connected with the confluence circuit and signals of the confluence circuit sampled by the current sensors of the second detection circuit, which are transmitted by the output ends of the differential amplifiers of the second detection circuit in real time, and presets the initial value of the counter to be zero;
step 2: the controller mcu converts the received signals of the front end voltage of the fuse connected with each photovoltaic solar panel and the signals of the photovoltaic solar panel sampled by the current sensor of the first detection circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit, into the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the actual current value of the photovoltaic solar panel respectively, meanwhile, the controller mcu also converts a real-time received signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit and a real signal of the confluence circuit sampled by a current sensor of the second detection circuit, which are transmitted from the output end of the differential amplifier of the second detection circuit, into an actual MPPT voltage value at the rear end of the fuse connected with the confluence circuit and an actual current value of the confluence circuit respectively;
and step 3: the controller mcu compares the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel with the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel;
and 4, step 4: if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is greater than the rear end MPPT voltage value K2 of the fuse connected with the actual confluence circuit corresponding to the actual photovoltaic solar panel and the difference value of subtracting the rear end MPPT voltage value K2 from the front end voltage value K1 is greater than a threshold value one, the controller mcu continuously and synchronously receives signals of the front end voltage of the fuse connected with the photovoltaic solar panel and signals of the rear end MPPT voltage of the fuse connected with the confluence circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit and are transmitted from the output end of the differential amplifier of the second detection circuit for a plurality of times;
and 5: the controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit;
step 6: the controller mcu compares the actual front end voltage value of the fuse connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one;
and 7: if the front end voltage value K1 of the fuse connected with the actual photovoltaic solar panel is larger than the back end MPPT voltage value K2 of the fuse connected with the actual confluence circuit corresponding to the photovoltaic solar panel and the difference value of subtracting the back end MPPT voltage value K2 from the front end voltage value K1 is larger than a threshold value one, the value of the counter is increased by one;
and 8: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of the times of continuously and synchronously receiving the fuses for a plurality of times by the controller mcu in the step 4, judging that the fuses connected with the photovoltaic solar panel are disconnected, displaying the information that the fuses connected with the photovoltaic solar panel are disconnected on the display module, and resetting the value of the counter;
and step 9: in addition, the controller mcu can also judge whether the photovoltaic solar panel is connected.
8. The method of the photovoltaic bus board-based detection system according to claim 7, wherein the controller mcu further comprises a method for determining whether the photovoltaic solar panel is connected, and the method comprises the following steps:
step 9-1: the controller mcu judges the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel;
step 9-2: if the actual rear-end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is zero or the actual front-end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, the controller mcu continuously and synchronously receives signals of the front-end voltage of the fuse connected with the photovoltaic solar panel and signals of the rear-end MPPT voltage of the fuse connected with the confluence circuit, which are transmitted from the output end of the differential amplifier of the detection circuit I and are transmitted for a plurality of times;
step 9-3: the controller mcu converts a received signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted from the output end of the differential amplifier of the first detection circuit into an actual front end voltage value of the fuse connected with the photovoltaic solar panel, and simultaneously converts a synchronously received signal of the back end MPPT voltage of the fuse connected with the confluence circuit transmitted from the output end of the differential amplifier of the second detection circuit into an actual synchronous back end MPPT voltage value of the fuse connected with the confluence circuit;
step 9-4: the controller mcu judges the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the synchronous actual rear end MPPT voltage value of the fuse connected with the confluence circuit one by one;
step 9-5: if the real MPPT voltage value K2 of the back end of the fuse connected with the confluence circuit of the photovoltaic solar panel is zero or the real front end voltage value K1 of the fuse connected with the photovoltaic solar panel is smaller than a preset threshold value II, the value of the counter is increased by one;
and 9-6: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel with the synchronous actual rear end MPPT voltage values of the fuses connected with the confluence circuit, if the value of the counter exceeds the preset proportion of the times of continuously and synchronously receiving for a plurality of times by the controller mcu in the step 9-2, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter.
9. The method of the photovoltaic bus board-based detection system according to claim 7, wherein the controller mcu further comprises a method for determining whether the photovoltaic solar panel is connected, and the method comprises the following steps:
step 9-A: the controller mcu judges the actual current value of the photovoltaic solar panel, the corresponding actual current value of the confluence circuit, the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel and the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel;
step 9-B: if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the actual front end voltage value K1 of the fuse connected with the photovoltaic solar panel minus the actual rear end MPPT voltage value K2 of the fuse connected with the confluence circuit corresponding to the photovoltaic solar panel is larger than a set threshold value four, and the corresponding actual current value of the confluence circuit is larger than a set threshold value five, the controller mcu continuously and synchronously receives the signal of the front end voltage of the fuse connected with the photovoltaic solar panel transmitted by the output end of the differential amplifier of the first detection circuit, the signal of the rear end MPPT voltage of the fuse connected with the confluence circuit transmitted by the output end of the differential amplifier of the second detection circuit and the current sensor of the second detection circuit for sampling A signal of the circuit;
step 9-C: the controller mcu converts the synchronously received signal of the front end voltage of the fuse connected with the photovoltaic solar panel and the signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit, which are transmitted from the output end of the differential amplifier of the first detection circuit, into the actual front end voltage value of the fuse connected with the photovoltaic solar panel and the synchronous actual current value of the photovoltaic solar panel respectively, meanwhile, the controller mcu also converts a synchronously received signal of the MPPT voltage at the rear end of the fuse connected with the confluence circuit transmitted by the output end of the differential amplifier of the second detection circuit and a signal of the confluence circuit sampled by the current sensor of the second detection circuit into a synchronous actual value of the MPPT voltage at the rear end of the fuse connected with the confluence circuit and a synchronous actual value of the current of the confluence circuit respectively;
step 9-D: the controller mcu judges the actual front end voltage value of the fuse connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuse connected with the confluence circuit and the synchronous actual current value of the confluence circuit one by one;
step 9-E: if the actual current value of the photovoltaic solar panel is smaller than a set threshold value three, the difference of the front end voltage value K1 of the fuse connected with the photovoltaic solar panel subtracted by the rear end MPPT voltage value K2 of the fuse connected with the confluence circuit is larger than a set threshold value four, and the current value of the synchronous actual confluence circuit is larger than a set threshold value five, the value of the counter is increased by one;
step 9-F: after comparing all the actual front end voltage values of the fuses connected with the photovoltaic solar panel, the synchronous actual current value of the photovoltaic solar panel, the synchronous actual back end MPPT voltage value of the fuses connected with the confluence circuit and the synchronous actual current value of the confluence circuit, if the value of the counter exceeds the preset proportion of the number of times of continuous synchronous receiving of the controller mcu in the step 9-B, judging that the photovoltaic solar panel is not accessed, displaying the information that the photovoltaic solar panel is not accessed on the display module, and resetting the value of the counter.
10. The method of claim 9, wherein the controller mcu processes the received signal of the front voltage of the fuse connected to the pv solar panel transmitted from the output terminal of the differential amplifier of the first detection circuit before converting the received signal of the front voltage of the fuse connected to the pv solar panel transmitted from the output terminal of the differential amplifier of the first detection circuit into the actual value of the front voltage of the fuse connected to the pv solar panel, and the controller mcu processes the received signal of the front voltage of the fuse connected to the pv solar panel transmitted from the output terminal of the differential amplifier of the first detection circuit into the synchronized signal of the actual MPPT voltage connected to the bus circuit after synchronizing the received signal of the rear voltage of the fuse connected to the bus transmitted from the output terminal of the differential amplifier of the second detection circuit in steps 5 and 9-3 Before the rear-end MPPT voltage value of the fuse, the controller mcu also processes the received signal of the rear-end MPPT voltage of the fuse connected with the confluence circuit, which is transmitted from the output end of the differential amplifier of the second detection circuit, by using a filtering algorithm;
before the controller mcu in step 9-C converts the synchronously received signal of the front end voltage of the fuse connected to the photovoltaic solar panel and the synchronously received signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit transmitted from the output end of the differential amplifier of the first detection circuit into the actual value of the front end voltage of the fuse connected to the photovoltaic solar panel and the synchronous value of the actual current of the photovoltaic solar panel, respectively, the controller mcu processes the synchronously received signal of the front end voltage of the fuse connected to the photovoltaic solar panel and the synchronously received signal of the photovoltaic solar panel sampled by the current sensor of the first detection circuit transmitted from the output end of the differential amplifier of the first detection circuit with a filtering algorithm; in step 9-C, before the controller mcu converts the synchronously received signal of the MPPT voltage at the rear end of the fuse connected to the bus circuit transmitted from the output terminal of the differential amplifier of the second detection circuit and the signal of the bus circuit sampled by the current sensor of the second detection circuit into the synchronous actual MPPT voltage value at the rear end of the fuse connected to the bus circuit and the synchronous actual current value of the bus circuit, the controller mcu performs filtering processing on the synchronously received signal of the MPPT voltage at the rear end of the fuse connected to the bus circuit transmitted from the output terminal of the differential amplifier of the second detection circuit and the signal of the bus circuit sampled by the current sensor of the second detection circuit by using a filtering algorithm.
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