CN105991091B - A kind of mobile detecting system for the test of High aititude photovoltaic plant grid adaptability - Google Patents
A kind of mobile detecting system for the test of High aititude photovoltaic plant grid adaptability Download PDFInfo
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Abstract
Include that the boosting for being depressured change container, being connect with the tested generator unit of photovoltaic plant being connect with power grid becomes container, and collection controls container the present invention provides a kind of mobile detecting system for the test of High aititude photovoltaic plant grid adaptability；It includes net side switchgear and step-down transformer, step-down transformer access set control container that decompression, which becomes container,；It includes pusher side switchgear and step-up transformer, step-up transformer access set control container that boosting, which becomes container,；Collection control container includes grid disturbance device sum aggregate control operating device；Grid disturbance device is used for the operating status of simulating grid；Collection control operating device, the technology requirement that should meet for adjusting system under the mobile detecting system working condition, and proposition high altitude environment.Compared with prior art, a kind of mobile detecting system for the test of High aititude photovoltaic plant grid adaptability provided by the invention realizes grid adaptability inspection optimization, so that detection process is become reliable, meet High aititude requirement.
Description
Technical Field
The invention relates to a mobile detection system for power grid adaptability test, in particular to a mobile detection system for high-altitude photovoltaic power station power grid adaptability test.
Background
At present, the development of photovoltaic power generation technology is rapid worldwide, a large number of grid-connected operation photovoltaic power stations are established in a dispute, as more and more photovoltaic power generation systems are connected to a power grid, in order to ensure that the grid-connected connection of the photovoltaic power stations does not have great influence on the power grid and the operation state change of the power grid does not influence the equipment safety of the photovoltaic power stations, various power grid companies put forward new strict requirements on the photovoltaic grid-connected power generation systems, standards for grid-connected connection and grid-connected detection standards of the photovoltaic power stations are formulated in the dispute, and only through the grid-connected detection of related mechanisms, grid-connected qualification is obtained, the safe connection of the photovoltaic power stations to the power grid can be ensured to operate, wherein the disturbance adaptability detection of the photovoltaic power.
The photovoltaic power station power grid disturbance adaptability means that when voltage change and frequency fluctuation occur in a grid-connected point of a photovoltaic power station in a power system, the photovoltaic power station can keep continuous operation without disconnection in a certain voltage change and frequency fluctuation time limit. The low-voltage ride through detection device recommended by the current industry standard is suitable for simulating the conditions of power grid frequency and voltage fluctuation by using a variable-frequency power supply.
Most of northwest areas rich in photovoltaic resources belong to high-altitude areas, and field detection equipment of grid-connected photovoltaic power stations is in short supply. The research on a power grid adaptability detection device of a high-altitude mobile grid-connected photovoltaic power station is urgent. In addition, the precision and the automation degree of the photovoltaic power station adaptability detection test are not high, the running state information in the experimental process cannot be comprehensively monitored, more human intervention is needed in the experimental process, the complexity of the test operation is increased, and the risk of personnel misoperation is also brought. And the control principle and the structural defects of the detection system are too large in harmonic wave and low in control precision, the whole equipment or components of the detection system can receive certain impact, and the resonance condition can be generated seriously, so that certain potential safety hazards are generated on the safety of the whole photovoltaic detection system, the detected equipment and even a power grid.
Operations such as high-voltage switch opening and closing, low-voltage circuit breaker continuous switching, transformer switching and the like are often involved in the power grid disturbance adaptability detection test process. The reliability of such operation can greatly influence the normal operation of the test and even cause damage to the test equipment, so that the real-time monitoring of the running state parameters of the transformer, the high-voltage switch cabinet, the low-voltage circuit breaker and the high-capacity variable frequency power supply in the photovoltaic power station power grid disturbance adaptability detection test process is very important. Therefore, a set of complete automatic control and comprehensive protection method is necessary for quickly positioning faults when an accident occurs to the system, and plays a certain role in guaranteeing subsequent fault elimination, test recovery and test equipment safety. Therefore, it is necessary to provide a photovoltaic power station power grid disturbance adaptability detection system which has higher altitude adaptability, high reliability, pull-out and use-up and improves the automation level.
Disclosure of Invention
In order to meet the needs of the prior art, the invention provides a mobile detection system for power grid adaptability test of a high-altitude photovoltaic power station, which comprises a step-down transformer container connected with a power grid, a step-up transformer container connected with a tested power generation unit in the photovoltaic power station and a centralized control container;
the step-down transformer container comprises a network side switch cabinet and a step-down transformer, and the step-down transformer is connected into the centralized control container;
the step-up transformer container comprises a machine side switch cabinet and a step-up transformer, and the step-up transformer is connected to the centralized control container;
the centralized control container comprises a power grid disturbance device and a centralized control operation device; the power grid disturbance device is used for simulating the running state of a power grid; the centralized control operation device is used for adjusting the working state of the mobile detection system.
Preferably, the power grid disturbance device comprises a variable frequency power supply and a power grid simulator; the variable frequency power supply comprises a safety chain loop, a first branch and a second branch, wherein the first branch and the second branch are respectively connected with the transformer;
the power grid simulator is used for adjusting the frequency, amplitude and phase of the alternating current output by the inverter in the variable frequency power supply; superposing the alternating current output by the first branch circuit and the alternating current output by the second branch circuit to obtain alternating current meeting the detection requirement;
preferably, the first branch circuit comprises a capacitor C1, an inverter PWM1 and a filter LC1 which are connected in sequence; the inverter PWM1 inverts the direct current filtered by the capacitor C1 into alternating current, and the alternating current is filtered by the filter LC1 and then is connected into the transformer;
the first branch circuit comprises a capacitor C2, an inverter PWM2 and a filter LC2 which are connected in sequence; the inverter PWM2 inverts the direct current filtered by the capacitor C2 into alternating current, and the alternating current is filtered by the filter LC2 and then is connected into the transformer;
the transformer is connected with a boosting transformer in the boosting transformer container and outputs the filtered alternating current to a tested power generation unit of the photovoltaic power station;
preferably, the power grid simulator comprises an A/D conversion module, an FPGA and a DSP; the A/D conversion module is used for carrying out data conversion on the voltage signal and the current signal output by the variable frequency power supply and then sending the voltage signal and the current signal to the FPGA; the FPGA is used for carrying out logic processing on the voltage signal and the current signal;
the DSP controls an output signal of the variable frequency power supply according to the voltage signal and the current signal sent by the FPGA, and sends the output signal and the fault alarm signal to a monitoring system of the photovoltaic power station;
the control mode of the DSP comprises a fundamental wave mode and a harmonic wave mode;
preferably, the fundamental wave mode is double closed loop feedback control based on the instantaneous value of the output voltage and the instantaneous value of the output current of the variable frequency power supply;
the harmonic mode is closed-loop feedback control based on the instantaneous value of the output voltage of the variable-frequency power supply; the harmonic mode performs feed-forward control on the voltage instantaneous value to suppress higher harmonics in the voltage instantaneous value; the feedforward coefficient is 1-LC omega2L and C are respectively an inductance value and a capacitance value of the filter;
preferably, the centralized control operation device comprises a comprehensive protection device, and an operation console, a PLC device and a temperature and humidity instrument which are respectively connected with the communication controller; the comprehensive protection device and the communication controller are respectively connected with the switch; the switch is connected to a monitoring system of the photovoltaic power station through the Ethernet;
the PLC equipment receives a control instruction issued by the monitoring system, acquires a switching value signal output by an operation console, and adjusts the working state of the PLC according to the control instruction and the switching value signal;
the communication controller is used for sending the switching value signal and the output signal of the temperature and humidity instrument to a monitoring system of the photovoltaic power station;
preferably, the operating platform comprises a test/stop knob, an opening/closing knob CB1, an opening/closing knob CB2, a fault resetting button and an emergency stop button;
the test/stop knob comprises a test node and a stop node which are respectively used for starting the detection system and stopping the detection system;
the switching-off/switching-on knob CB1 comprises a switching-off node CB1 and a switching-on node CB 1;
the switching-off/switching-on knob CB2 comprises a switching-off node CB2 and a switching-on node CB 2;
the fault resetting button is used for manual resetting operation after the fault of the detection system is eliminated;
the emergency stop button is used for manually stopping the detection system when a fault occurs;
preferably, the emergency stop button comprises a normally closed node and a normally open node;
the normally closed node is connected with a safety chain loop of a variable frequency power supply in the power grid disturbance device, a closing node CB1 and a closing node CB2 in series respectively; the normally open node is connected with a switching-off node CB1 and a switching-off node CB2 in parallel respectively;
preferably, the working state of the PLC device includes a standby state, a test state, a fault state, and a shutdown state;
the PLC equipment works in a standby state after receiving a switching-on signal of a switching-on/switching-off knob CB1 and a switching-off signal of a switching-on/switching-off knob CB2 of the operating platform;
the PLC equipment works in a test state after receiving a switching-on signal of a switching-on/switching-off knob CB1 and a switching-on signal of a switching-on/switching-off knob CB2 of the operating platform;
the PLC equipment works in a fault state after receiving an action signal of an emergency stop button in the operation table and an action signal of a safety chain loop of a variable frequency power supply in the power grid disturbance device;
and under the condition that the emergency stop button and the safety chain loop do not act, the PLC equipment works in a stop state after receiving a stop action signal of the test/stop knob in the operating platform.
Compared with the closest prior art, the excellent effects of the invention are as follows:
1. in the technical scheme of the invention, the frequency regulation control of the variable frequency power supply is flexible, two paths of frequencies can be generated through two paths of inverters, the frequency regulation is carried out by using a frequency superposition method, and the output frequency required by adaptive detection is obtained by regulating the output frequency and the phase of the two paths of inverters;
2. in the technical scheme of the invention, the output frequency of the variable frequency power supply has the advantages of high precision and small harmonic;
3. in the technical scheme of the invention, the PLC equipment comprises four working states of a standby state, a test state, a fault state and a shutdown state, can flexibly meet various requirements in the adaptive detection process, fully considers the possible abnormal conditions in the detection process and ensures the reliability of the detection system;
4. according to the technical scheme, the PLC equipment automatically switches the working state according to a control instruction sent by an upper computer of a monitoring system in the photovoltaic power station, so that full-automatic unmanned intervention in the detection process is realized, the convenience of the test is greatly improved, and the occurrence of an accident situation is avoided;
5. in the technical scheme of the invention, the operation flows of the test/stop knob, the switch-off/switch-on knob CB1, the switch-off/switch-on knob CB2, the fault resetting button and the emergency stop button in the operation panel are reliable, the overtime and other conditions in the switch-off operation can be monitored, and the abnormal conditions caused by the unsuccessful switch-off and switch-on in the detection process are avoided;
6. in the technical scheme of the invention, the technical requirements of adapting to primary equipment at the power grid side, the photovoltaic power station side and the mobile detection system in the high-altitude environment are determined, and the electrical safety and reliability of the mobile detection system in the high-altitude area are greatly improved;
7. in the technical scheme of the invention, the comprehensive protection device is adopted to monitor the fault state of the mobile detection system, and when the fault problem occurs, the trip protection is realized;
8. the mobile detection system for the power grid adaptability test of the high-altitude photovoltaic power station realizes the optimization of the power grid disturbance adaptability test, ensures that the detection process becomes reliable and convenient, and meets the requirement of vehicle-mounted transportation.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1: the invention discloses a mobile detection system structure diagram for high-altitude photovoltaic power station power grid adaptability test;
FIG. 2: the structure of a variable frequency power supply in the embodiment of the invention;
FIG. 3: the fundamental wave mode control circuit schematic diagram of the power grid simulator in the embodiment of the invention;
FIG. 4: the harmonic mode control circuit of the power grid simulator in the embodiment of the invention is shown in a schematic diagram;
FIG. 5: the structure schematic diagram of the power grid simulator in the embodiment of the invention;
FIG. 6: the structure of the centralized control operation device in the embodiment of the invention is schematic;
FIG. 7: the working state of the PLC equipment in the embodiment of the invention is converted into a schematic diagram.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides a mobile detection system suitable for power grid adaptability test of a power generation unit of a high-altitude photovoltaic power station, which realizes networking, intelligent control and real-time protection of communication in the disturbance adaptability detection process of the photovoltaic power station and enables the disturbance adaptability detection process of the photovoltaic power station to be safer and more reliable.
As shown in fig. 1, the mobile detection system of the invention comprises a step-down transformer container connected with a power grid, a step-up transformer container connected with a detected power generation unit in a photovoltaic power station, and a centralized control container.
Step-down transformer container
The system comprises a network side switch cabinet and a step-down transformer, wherein the step-down transformer is connected into a centralized control container.
In the embodiment, the grid-side switch cabinet and the step-down transformer are compatible with 35kV and 10 kV.
The network side switch cabinet refers to a switch cabinet integrated with various electric switches of a mobile detection system connected to a power grid.
Second, boost transformer container
The intelligent control system comprises a machine side switch cabinet and a step-up transformer, wherein the step-up transformer is connected into a centralized control container.
In the embodiment, the machine side switch cabinet and the booster transformer are compatible with 35kV and 10 kV;
the machine side switch cabinet refers to a switch cabinet integrated with various electrical switches for connecting the mobile detection system to a detected power generation unit in a photovoltaic substation.
Three, centralized control container
The system comprises a power grid disturbance device and a centralized control operation device. Wherein,
the power grid disturbance device is used for simulating the running state of a power grid; and the centralized control operation device is used for adjusting the working state of the mobile detection system.
1. Power grid disturbance device
The device comprises a variable frequency power supply and a power grid simulator. Wherein,
the variable frequency power supply comprises a safety chain loop, a first branch and a second branch, wherein the first branch and the second branch are respectively connected with the transformer.
The power grid simulator is used for regulating the frequency, amplitude and phase of the alternating current output by the inverter in the variable frequency power supply; and superposing the alternating current output by the first branch circuit and the alternating current output by the second branch circuit to obtain the alternating current meeting the detection requirement.
(1) Variable frequency power supply
①, as shown in FIG. 2, a first branch circuit comprises a capacitor C1, an inverter PWM1 and a filter LC1 which are connected in sequence, the inverter PWM1 inverts direct current filtered by the capacitor C1 into alternating current, the alternating current is connected into a transformer after being filtered by the filter LC1, the first branch circuit comprises a capacitor C2, an inverter PWM2 and a filter LC2 which are connected in sequence, the inverter PWM2 inverts direct current filtered by the capacitor C2 into alternating current, and the alternating current is connected into the transformer after being filtered by the filter LC 2.
High-precision control of output voltage is realized by vector superposition output by the two inverters, and control of output high-frequency harmonic is realized by frequency superposition output by the two inverters.
②, the transformer is connected with a boosting transformer of the boosting transformer container, and the filtered alternating current is output to a tested power generation unit of the photovoltaic power station.
the safety chain loop is a group of normally closed wiring circuits which are connected in series, and the action of the safety chain can trigger the emergency stop.
(2) Power grid simulator
①, as shown in FIG. 5, the power grid simulator comprises an A/D conversion module, an FPGA and a DSP, wherein,
and the A/D conversion module is used for converting the voltage signal and the current signal data output by the variable frequency power supply and then transmitting the converted data to the FPGA.
And the FPGA is used for carrying out logic processing on the voltage signal and the current signal and sending the processed signals to the DSP.
In this embodiment, the FPGA has functions of signal acquisition, a/D conversion, outputting a protection signal, and performing data interaction with the DSP. The FPGA receives signals sent by an upper computer of a monitoring system in the photovoltaic power station, and processes the signals, for example, receiving switching value input signals sent by the upper computer to start a test. The FPGA performs logic processing on signals such as voltage, current and the like output by the A/D sampling, for example, the zero crossing point of the voltage signal is judged, so that frequency information is obtained. And analyzing the current sampling signal, and sending a protection signal when the current is over-high. Meanwhile, the FPGA also sends the acquired information of voltage, current, logic processing and the like to the DSP through a data bus, so that effective values and real-time values of the voltage and the current can be calculated, and the variable frequency power supply is controlled.
And the DSP controls the output signal of the variable frequency power supply according to the voltage signal and the current signal sent by the FPGA, and sends the output signal and the fault alarm signal to an upper computer of a monitoring system in the photovoltaic power station.
secondly, the control mode of the DSP comprises a fundamental wave mode and a harmonic wave mode.
As shown in fig. 3, the fundamental wave mode is a double closed-loop feedback control based on the instantaneous value of the output voltage and the instantaneous value of the output current of the variable frequency power supply, and the double closed-loop feedback control can not only meet the requirement of obtaining a variable frequency power supply with high performance index, but also improve the response speed and stability of the mobile detection system.
As shown in fig. 4, the harmonic mode is a closed-loop feedback control based on the instantaneous value of the output voltage of the variable frequency power supply.
The harmonic mode performs feedforward control on the voltage instantaneous value to suppress higher harmonics in the voltage instantaneous value; the feedforward coefficient is 1-LC omega2And L and C are the inductance and capacitance values of the filter, respectively. The negative feedback current feed-forward control is introduced into the current inner ring, so that the dynamic response speed of the inverter is increased, the adaptability to linear load disturbance is enhanced, and the harmonic content of the output voltage is effectively reduced.
2. Centralized control operation device
As shown in fig. 6, the device comprises a comprehensive protection device, and an operation console, a PLC device and a temperature and humidity instrument which are respectively connected with the communication control; the comprehensive protection device and the communication controller are respectively connected with the switch; the switch is connected to the upper computer of the photovoltaic power station detection monitoring system through the Ethernet. Wherein,
the PLC equipment is accessed to the communication controller by an RS485 communication protocol and collects switching value signals output by the operation console;
the comprehensive protection device is connected to the switch through the Ethernet, so that the monitoring of the electrical quantity in the detection process of the photovoltaic power station is realized, and abnormal conditions (short circuit, open circuit, short circuit and the like) in the circuit are protected; the number of the integrated protection devices in this embodiment is 2.
And the communication controller is used for sending the switching value signal and the output signal of the temperature and humidity instrument to an upper computer of a monitoring system in the photovoltaic power station to complete the interchange conversion from the RS485 communication protocol to the Ethernet communication protocol.
(1) Operation table
The device comprises a test/stop knob, an opening/closing knob CB1, an opening/closing knob CB2, a fault resetting button and an emergency stop button. Wherein,
the test/stop knob comprises a test node and a stop node which are respectively used for starting the detection system and stopping the detection system.
② the opening/closing knob CB1 comprises an opening node CB1 and a closing node CB 1.
and thirdly, the opening/closing knob CB2 comprises an opening node CB2 and a closing node CB 2.
and fourthly, a fault resetting button is used for manual resetting operation after the fault of the detection system is eliminated.
the emergency stop button is used for manually stopping the detection system when a fault occurs.
The emergency stop button comprises a normally closed node and a normally open node:
the normally closed node is connected with a safety chain loop of a variable frequency power supply in the power grid disturbance device, and a closing node CB1 and a closing node CB2 in series respectively; the normally open node is connected with the switching-off node CB1 and the switching-off node CB2 in parallel respectively.
(2) The working state of the PLC equipment comprises a standby state, a test state, a fault state and a shutdown state. The upper computer of the monitoring system in the photovoltaic power station issues the parameter setting value and the control instruction to the PLC equipment through the communication controller:
the PLC equipment carries out working state conversion according to the control command and the switching value signal output by the operating platform, and carries out parameter setting of corresponding working states according to parameter setting values. And the PLC equipment uploads the data information in the working state to an upper computer of the photovoltaic power station in real time. Wherein,
the PLC equipment works in a standby state after receiving a switching-on signal of the switching-off/switching-on knob CB1 and a switching-off signal of the switching-off/switching-on knob CB2 of the operating platform.
the PLC equipment works in a test state after receiving a switching-on signal of the switching-off/switching-on knob CB1 and a switching-on signal of the switching-off/switching-on knob CB2 of the operating platform.
the PLC equipment receives an action signal of an emergency stop button in the operation table and an action signal of a safety chain loop of a variable frequency power supply in the power grid disturbance device and then works in a fault state.
and fourthly, under the condition that the emergency stop button and the safety chain loop do not act, the PLC equipment works in a stop state after receiving a stop action signal of the test/stop knob in the operation panel.
(3) The working state transfer process of the PLC equipment comprises the following steps:
as shown in fig. 7, when the initial state of the PLC device is the shutdown state, the opening/closing knob CB1 opens, and the opening/closing knob CB2 opens:
firstly, a test/stop knob is pressed down, an opening/closing knob CB1 is closed, an opening/closing knob CB2 keeps an opening state, and a mobile detection system enters a standby state;
secondly, the switching-on/switching-off knob CB1 keeps a switching-on state, the switching-on/switching-off knob CB2 switches on, and the mobile detection system enters a test state;
the opening/closing knob CB2 keeps a closing state, the opening/closing knob CB1 opens or the safety chain loop acts or the emergency stop button is pressed, and the mobile detection system enters a fault state;
if the safety chain loop does not act and the emergency stop button is not pressed, the opening/closing knob CB1 is opened, the opening/closing knob CB2 is opened, the fault resetting button is pressed, the test/stop knob is pressed, and the mobile detection system enters a shutdown state.
Fourthly, the atmospheric condition with an altitude of 4500 meters is greatly different from that of a plain area, and certain requirements are brought to primary insulation of high-voltage equipment and heat dissipation of high-power equipment, so that the adaptive technical requirements of the primary equipment in the high-altitude environment need to be determined, and the method specifically comprises the following steps:
①, the factory test of equipment such as a transformer, a switch cabinet, a cable and the like of primary high-voltage equipment is in accordance with the national standard after high altitude trimming.
secondly, performing power frequency voltage withstand test in the container after all equipment in the mobile detection system finishes vehicle-mounted installation in the container, testing the primary system (except voltage and current transformers) according to 85kV insulation voltage withstand for 1 minute, and performing altitude trimming according to national standards when the testing site is a high-altitude area, so that the safety of the electrical insulation performance of the whole installation process of the equipment is ensured.
and thirdly, the heat dissipation requirement of forced air cooling or natural air cooling equipment is designed according to 1.5 times of the heat dissipation capacity of the plain area, so that the influence caused by thin air in the high-altitude area is compensated.
Finally, it should be noted that: the described embodiments are only some embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (8)
1. A mobile detection system for power grid adaptability test of a high-altitude photovoltaic power station is characterized by comprising a step-down transformer container connected with a power grid, a step-up transformer container connected with a tested power generation unit in the photovoltaic power station and a centralized control container;
the step-down transformer container comprises a network side switch cabinet and a step-down transformer, and the step-down transformer is connected into the centralized control container;
the step-up transformer container comprises a machine side switch cabinet and a step-up transformer, and the step-up transformer is connected to the centralized control container;
the centralized control container comprises a power grid disturbance device and a centralized control operation device; the power grid disturbance device is used for simulating the running state of a power grid; the centralized control operation device is used for adjusting the working state of the mobile detection system;
the power grid disturbance device comprises a variable frequency power supply and a power grid simulator; the variable frequency power supply comprises a safety chain loop, a first branch and a second branch, wherein the first branch and the second branch are respectively connected with the transformer;
the power grid simulator is used for adjusting the frequency, amplitude and phase of the alternating current output by the inverter in the variable frequency power supply; and superposing the alternating current output by the first branch circuit and the alternating current output by the second branch circuit to obtain the alternating current meeting the detection requirement.
2. The system of claim 1, wherein the first branch comprises a capacitor C1, an inverter PWM1, and a filter LC1 connected in series; the inverter PWM1 inverts the direct current filtered by the capacitor C1 into alternating current, and the alternating current is filtered by the filter LC1 and then is connected into the transformer;
the first branch circuit comprises a capacitor C2, an inverter PWM2 and a filter LC2 which are connected in sequence; the inverter PWM2 inverts the direct current filtered by the capacitor C2 into alternating current, and the alternating current is filtered by the filter LC2 and then is connected into the transformer;
the transformer is connected with a boosting transformer in the boosting transformer container, and outputs the filtered alternating current to a tested power generation unit of the photovoltaic power station.
3. The system of claim 1, wherein the grid simulator comprises an a/D conversion module, an FPGA, and a DSP; the A/D conversion module is used for carrying out data conversion on the voltage signal and the current signal output by the variable frequency power supply and then sending the voltage signal and the current signal to the FPGA; the FPGA is used for carrying out logic processing on the voltage signal and the current signal;
the DSP controls an output signal of the variable frequency power supply according to the voltage signal and the current signal sent by the FPGA, and sends the output signal and the fault alarm signal to a monitoring system of the photovoltaic power station;
the control mode of the DSP comprises a fundamental wave mode and a harmonic wave mode.
4. The system of claim 3, wherein the fundamental mode is a double closed-loop feedback control based on an output voltage transient and an output current transient of the variable frequency power supply;
the harmonic mode is closed-loop feedback control based on the instantaneous value of the output voltage of the variable-frequency power supply; the harmonic mode performs feed-forward control on the voltage instantaneous value to suppress higher harmonics in the voltage instantaneous value; the feedforward coefficient is 1-LC omega2And L and C are respectively an inductance value and a capacitance value of the filter.
5. The system of claim 1, wherein the centralized control operation device comprises a comprehensive protection device, and an operation desk, a PLC device and a temperature and humidity instrument which are respectively connected with the communication controller; the comprehensive protection device and the communication controller are respectively connected with the switch; the switch is connected to a monitoring system of the photovoltaic power station through the Ethernet;
the PLC equipment receives a control instruction issued by the monitoring system, acquires a switching value signal output by an operation console, and adjusts the working state of the PLC according to the control instruction and the switching value signal;
and the communication controller sends the switching value signal and the output signal of the temperature and humidity instrument to a monitoring system of the photovoltaic power station.
6. The system of claim 5, wherein the console comprises a test/stop knob, an open/close knob CB1, an open/close knob CB2, a fail-back button, and an emergency stop button;
the test/stop knob comprises a test node and a stop node which are respectively used for starting the detection system and stopping the detection system;
the switching-off/switching-on knob CB1 comprises a switching-off node CB1 and a switching-on node CB 1;
the switching-off/switching-on knob CB2 comprises a switching-off node CB2 and a switching-on node CB 2;
the fault resetting button is used for manual resetting operation after the fault of the detection system is eliminated;
the emergency stop button is used for manually stopping the detection system when a fault occurs.
7. The system of claim 6, wherein the emergency stop button comprises a normally closed node and a normally open node;
the normally closed node is connected with a safety chain loop of a variable frequency power supply in the power grid disturbance device, a closing node CB1 and a closing node CB2 in series respectively; the normally open node is connected with the switching-off node CB1 and the switching-off node CB2 in parallel respectively.
8. The system of claim 5, wherein the operating states of the PLC device include a standby state, a test state, a fault state, and a shutdown state;
the PLC equipment works in a standby state after receiving a switching-on signal of a switching-on/switching-off knob CB1 and a switching-off signal of a switching-on/switching-off knob CB2 of the operating platform;
the PLC equipment works in a test state after receiving a switching-on signal of a switching-on/switching-off knob CB1 and a switching-on signal of a switching-on/switching-off knob CB2 of the operating platform;
the PLC equipment works in a fault state after receiving an action signal of an emergency stop button in the operation table and an action signal of a safety chain loop of a variable frequency power supply in the power grid disturbance device;
and under the condition that the emergency stop button and the safety chain loop do not act, the PLC equipment works in a stop state after receiving a stop action signal of the test/stop knob in the operating platform.
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