CN113176468B - Inverter detection method and application device thereof - Google Patents
Inverter detection method and application device thereof Download PDFInfo
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- CN113176468B CN113176468B CN202110648744.4A CN202110648744A CN113176468B CN 113176468 B CN113176468 B CN 113176468B CN 202110648744 A CN202110648744 A CN 202110648744A CN 113176468 B CN113176468 B CN 113176468B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides an inverter detection method and an application device thereof, which are applied to the technical field of power electronics. According to the inverter detection method provided by the invention, on the premise that the normal operation of the inverter is not influenced in the whole detection process, the detection of the operation state of the inverter is realized on the basis of the voltage and the output duty ratio of the switching tube of the DC/DC conversion circuit, and whether the inverter fails or not can be judged in time, so that the operation stability of the whole photovoltaic system is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an inverter detection method and an application device thereof.
Background
The photovoltaic power generation system can directly convert solar radiation energy into direct current electric energy by utilizing the photovoltaic effect of a solar cell semiconductor material (photovoltaic module), and is a new energy power generation system widely applied in recent years. Most of the existing photovoltaic power generation systems comprise a photovoltaic module, a junction box, an inverter, a grid-connected transformer and the like, wherein the output end of the photovoltaic module is connected with the direct current side of the inverter through the junction box, the alternating current side of the inverter is connected with an alternating current power grid through the grid-connected transformer, and alternating current electric energy is finally provided for the alternating current power grid.
In the above configuration of the photovoltaic power generation system, the inverter is used to convert the dc power output by the photovoltaic module into ac power, which is one of the key devices in the photovoltaic power generation system, and once the inverter fails, the entire photovoltaic power generation system will be shut down, which affects the power generation amount of the entire system.
In view of the above important functions of the inverter, how to efficiently detect the operating state of the inverter and determine whether the inverter fails is one of the problems to be solved by those skilled in the art.
Disclosure of Invention
The invention provides an inverter detection method and an application device thereof, which can realize the detection of the running state of an inverter on the premise of not influencing the running process of the inverter, judge whether the inverter has a fault or not in time and contribute to improving the running stability of the whole photovoltaic system.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides an inverter detection method, including:
acquiring the voltage and the output duty ratio of a switching tube of a DC/DC conversion circuit in an inverter;
calculating the coincidence ratio of the voltage of the switching tube and the output duty ratio;
and judging whether the inverter fails or not according to the relationship between the contact ratio and the contact ratio threshold value.
Optionally, the obtaining of the switching tube voltage and the output duty ratio of the DC/DC conversion circuit in the inverter includes:
in a target time period, simultaneously and respectively acquiring the voltage of a switching tube and the output duty ratio of a DC/DC conversion circuit in an inverter according to a preset sampling frequency, and acquiring a voltage value array corresponding to the voltage of the switching tube and a duty ratio array corresponding to the output duty ratio.
Optionally, the calculating the coincidence ratio of the switching tube voltage and the output duty cycle includes:
performing per-unit processing on each voltage value in the voltage value array to obtain a per-unit voltage value array;
converting each output duty ratio in the duty ratio array into a square wave signal to obtain a square wave signal array;
and calculating the coincidence ratio of the per-unit voltage value array and the square wave signal array.
Optionally, the calculating the contact ratio between the per-unit voltage value array and the square wave signal array includes:
and calculating the coincidence ratio of the per-unit voltage value array and the square wave signal array in a time domain or a frequency domain.
Optionally, the determining whether the inverter fails according to the relationship between the contact ratio and the contact ratio threshold includes:
if the contact ratio is larger than or equal to a contact ratio threshold value, judging that the inverter has a fault;
and if the contact ratio is smaller than the contact ratio threshold value, judging that the inverter is normal.
Optionally, if it is determined that the inverter fails, the inverter detection method according to the first aspect of the present invention further includes:
and outputting a first control signal, wherein the first control signal is used for disconnecting the inverter from a front-stage circuit or a rear-stage circuit.
Optionally, the preset sampling frequency is equal to N times of a switching frequency of the DC/DC conversion circuit, where N is greater than 1.
Optionally, the inverter detection method provided by any one of the first aspect of the present invention further includes:
monitoring the voltage of a switching tube of the DC/DC conversion circuit;
if the voltage of the switching tube is lower than a preset voltage threshold, outputting a second control signal;
the second control signal is used for disconnecting the inverter from a front-stage circuit or a rear-stage circuit.
In a second aspect, the present invention provides an inverter detection circuit comprising a voltage acquisition circuit and a control circuit, wherein,
the voltage acquisition circuit is connected with a DC/DC conversion circuit in the inverter and acquires the voltage of a switching tube of the DC/DC conversion circuit;
the control circuit is connected to the voltage acquisition circuit, and the control circuit executes the inverter detection method according to any one of the first aspect of the present invention.
Optionally, the inverter detection circuit provided by the second aspect of the present invention further includes: a controllable switch, wherein,
the controllable switch is connected in series between the DC/DC conversion circuit and a preceding stage circuit;
the control end of the controllable switch is connected with the control circuit;
the controllable switch is in a disconnected state under the condition of receiving the first control signal or the second control signal sent by the control circuit.
Optionally, the control circuit comprises a driving circuit and a voltage detection circuit, wherein,
the output end of the voltage detection circuit is connected with the control end of the controllable switch through the driving circuit;
the input end of the voltage detection circuit is connected with the voltage sampling circuit;
the voltage detection circuit executes the inverter detection method according to any one of the first aspect of the invention.
Optionally, the control circuit is integrated with the inverter, or the control circuit is integrated with the controllable switch.
Optionally, the DC/DC conversion circuit includes a two-level DC/DC conversion circuit or a multi-level DC/DC conversion circuit with two or more levels.
In a third aspect, the present invention provides an inverter comprising: a DC/DC conversion circuit, a DC/AC conversion circuit, and an inverter detection circuit according to any one of the second aspect of the present invention, wherein,
the DC/DC conversion circuit is connected with the DC/AC conversion circuit in series;
the inverter detection circuit is connected with the DC/DC conversion circuit.
In a fourth aspect, the present invention provides a photovoltaic system comprising: photovoltaic module, combiner box, grid-connected transformer and the inverter provided by the third aspect of the invention, wherein,
the photovoltaic module is connected with the direct current side of the inverter through the combiner box;
and the alternating current side of the inverter is connected with an alternating current power grid through the grid-connected transformer.
The inverter detection method provided by the invention comprises the steps of firstly obtaining the voltage of a switching tube and the output duty ratio of a DC/DC conversion circuit in the inverter, then calculating the coincidence degree of the voltage of the switching tube and the output duty ratio, and judging whether the inverter fails according to the magnitude relation of the obtained coincidence degree and the coincidence degree threshold value. According to the inverter detection method provided by the invention, on the premise that the normal operation of the inverter is not influenced in the whole detection process, the detection of the operation state of the inverter is realized based on the voltage of the switching tube and the output duty ratio of the DC/DC conversion circuit, whether the inverter fails or not can be judged in time, and the operation stability of the whole photovoltaic system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an inverter detection method according to an embodiment of the present invention;
fig. 2 is a flow chart of another inverter detection method provided by the embodiment of the invention;
fig. 3 is a flowchart of another inverter detection method provided by the embodiment of the invention;
fig. 4 is a schematic structural diagram of an inverter detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another inverter detection circuit provided in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of another inverter detection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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.
The inverter detection method provided by the invention can be applied to a controller in an inverter, can also be applied to an electric system to which the inverter belongs, such as controllers of other electric equipment in a photovoltaic power generation system and an energy storage system, and can also be applied to a server on a network side under certain conditions.
Referring to fig. 1, fig. 1 is a flowchart of an inverter detection method according to an embodiment of the present invention, where the flowchart of the inverter detection method according to the embodiment of the present invention may include:
s100, obtaining the voltage and the output duty ratio of a switching tube of a DC/DC conversion circuit in the inverter.
Based on the basic working principle of the DC/DC conversion circuit in the inverter, it can be known that there is a direct corresponding relationship between the switching tube voltage and the output duty ratio of the DC/DC conversion circuit, and the change laws of the switching tube voltage and the output duty ratio are consistent.
Optionally, for the acquisition of the switching tube voltage and the output duty ratio, in a specific implementation, the switching tube voltage and the output duty ratio of the DC/DC conversion circuit may be sampled according to a preset sampling frequency within a target time period, of course, the sampling process starts simultaneously, so as to obtain a corresponding voltage value array and a corresponding duty ratio array, that is, the switching tube voltage is represented by the voltage value array, and the voltage value array includes a plurality of voltage values obtained by sampling, correspondingly, the output duty ratio is represented by the array duty ratio, and the duty ratio array includes the output duty ratio obtained by a plurality of sampling. It is conceivable that the two parameters of the switching tube voltage and the output duty ratio are sampled at the same preset sampling frequency in the same target time period, and therefore, the time axes corresponding to the voltage value array and the duty ratio array are the same.
The target time period can be selected flexibly according to the detection requirement under the condition that the inverter is in the running state by combining with a specific detection process. The target time period may be set longer if more sampled values are desired, and conversely, the target time period may be set shorter if detection efficiency is desired to be provided and the detection time is shortened.
Optionally, in order to represent the voltage of the switching tube and the output duty ratio by an array as accurately as possible, the preset sampling frequency may be increased appropriately, so that the preset sampling frequency is equal to N times of the switching frequency of the DC/DC conversion circuit, where N is greater than 1. It is conceivable that the larger the value of N is, the more data can be collected in the target time period, and correspondingly, the longer the detection time is, so that in practical application, the specific value of N should be flexibly selected in combination with the hardware performance of the controller executing the inverter detection method provided by the embodiment of the present invention and the actual detection accuracy requirement.
After the step, a voltage value array V can be obtained * array[v1 * ,v2 * ,v3 * ……vn * ]And duty cycle array D * array[d1 * ,d2 * ,d3 * ……dn * ]。
And S110, calculating the coincidence ratio of the voltage of the switching tube and the output duty ratio.
As can be seen from the above, since the switching tube voltage and the output duty ratio are represented by different parameters, it is necessary to perform necessary processing on the two arrays in order to calculate the coincidence ratio between the switching tube voltage and the output duty ratio.
Optionally, the voltage values in the voltage value array are subjected to per-unit processing to obtain a per-unit voltage value array, and the per-unit voltage value array may be represented as Varray [ v1, v2, v3 … … vn ]. Further, each output duty cycle in the duty cycle array is converted into a square wave signal, and a corresponding square wave signal array is obtained, which may be specifically denoted as Darray [ d1, d2, d3 … … dn ].
And after the conversion treatment is finished, calculating the contact ratio of the per-unit voltage value array and the square wave signal array, and taking the obtained calculation result as the contact ratio of the voltage of the switching tube and the output duty ratio.
Optionally, the voltage of the switching tube and the output duty ratio may be represented by time domain data or frequency domain data, so that the calculation of the coincidence degree may also be completed in the time domain or the frequency domain, that is, the coincidence degree between the per-unit voltage value array and the square wave signal array in the time domain or the frequency domain is calculated.
It should be noted that, for the calculation of the coincidence degree, the calculation may be mainly characterized based on the difference between the per unit voltage value and the amplitude of the square wave signal, and as for the specific calculation method of the coincidence degree of the amplitude, it may be realized based on the prior art, and the present invention is not limited thereto.
And S120, judging whether the inverter fails according to the size relation between the contact ratio and the contact ratio threshold value.
After the coincidence degree of the voltage of the switching tube and the output duty ratio is obtained through calculation, whether the inverter fails or not can be judged according to the magnitude relation between the coincidence degree and the coincidence degree threshold value. Specifically, if the obtained coincidence degree is greater than or equal to the coincidence degree threshold value, the inverter is judged to be in fault, and conversely, if the obtained coincidence degree is less than the coincidence degree threshold value, the inverter is judged to be normal.
It should be noted that, for the specific value of the contact ratio threshold, the value may be selected based on the specific detection accuracy, and the specific value of the contact ratio threshold is not limited in the present invention.
In summary, the inverter detection method provided by the embodiment of the invention realizes detection of the inverter operation state based on the switching tube voltage and the output duty ratio of the DC/DC conversion circuit on the premise that the normal operation of the inverter is not affected in the whole detection process, can timely judge whether the inverter fails, and is helpful for improving the operation stability of the whole photovoltaic system.
Optionally, referring to fig. 2, fig. 2 is a flowchart of another inverter detection method provided in an embodiment of the present invention, and on the basis of the embodiment shown in fig. 1, the inverter detection method provided in this embodiment further includes:
and S130, outputting a first control signal under the condition of the inverter fault.
If the inverter is judged to be in fault through the embodiment shown in fig. 1, the first control signal is further output, and the connection of the inverter and the front-stage circuit or the rear-stage circuit is disconnected through the first control signal, so that the influence of the fault of the inverter on other equipment in the system is prevented.
It should be noted that, as for the specific implementation manner of the receiving side of the first control signal and the disconnection, the implementation manner may be implemented based on the prior art, and may also be implemented based on the detection circuit provided in the subsequent content of the present invention, which is not detailed here.
In summary, the inverter detection method provided in this embodiment can not only detect whether the inverter has a fault, but also output the first control signal to disconnect the inverter from the previous stage circuit or the subsequent stage circuit when the inverter is determined to have a fault, thereby preventing the fault from spreading.
Optionally, referring to fig. 3, fig. 3 is a flowchart of another inverter detection method provided in an embodiment of the present invention, where the flowchart of this embodiment may include:
and S200, monitoring the voltage of a switching tube of the DC/DC conversion circuit.
For the determined inverter, the switching tube voltage of the DC/DC conversion circuit in the normal state is determined, so that whether the inverter is abnormal or not can be judged by monitoring the switching tube voltage of the DC/DC conversion circuit.
Optionally, in the foregoing embodiment, the voltage of the switching tube has been sampled, and therefore, this step and the subsequent steps may be executed after S100, and of course, may also be executed when the inverter is determined to be normal through the determination of S120, and any control process that can be combined with the foregoing embodiments is optional, and also falls within the scope of protection of the present invention without departing from the scope of the core idea of the present invention.
S210, judging whether the voltage of the switching tube is lower than a preset voltage threshold value, if so, executing S220.
The selection of the preset voltage threshold value can be combined with the selection of the voltage of the switching tube and the specific detection precision when the DC/DC conversion circuit normally works, and the specific value of the preset voltage threshold value is not limited by the invention.
If the voltage of the switching tube is not lower than the preset voltage threshold value, the inverter can be judged to be normal, and the current detection process can be deduced.
And S220, outputting a second control signal.
And under the condition that the voltage of the switching tube is lower than a preset voltage threshold, outputting a second control signal, and disconnecting the inverter from the front-stage circuit or the rear-stage circuit through the second control signal.
It should be noted that, as for the specific implementation manner of the receiving side of the second control signal and the disconnection, the implementation manner may be implemented based on the prior art, and may also be implemented based on the detection circuit provided in the subsequent content of the present invention, which is not detailed here.
In summary, the inverter detection method provided in this embodiment provides another detection implementation method, and based on the foregoing embodiments, the inverter detection method can perform a wider and more diverse detection, which is helpful to further improve the detection accuracy and ensure the operation stability and safety of the system.
Optionally, referring to fig. 4, fig. 4 is a schematic structural diagram of an inverter detection circuit according to an embodiment of the present invention, where the inverter detection circuit according to the embodiment includes: a voltage acquisition circuit 10 and a control circuit 20, wherein,
the voltage acquisition circuit 10 is connected with a DC/DC conversion circuit in the inverter to acquire the switching tube voltage of the DC/DC conversion circuit, the control circuit 20 is connected with the voltage acquisition circuit 10, the voltage acquisition circuit 10 acquires the switching tube voltage and the output duty ratio, and the inverter detection method provided by any of the embodiments is executed to complete the detection of the inverter.
Further, referring to fig. 5, fig. 5 is a schematic structural diagram of another inverter detection circuit provided in the embodiment of the present invention, and on the basis of the embodiment shown in fig. 4, the inverter detection circuit provided in the embodiment further includes: a controllable switch 30.
Specifically, the controllable switch 30 is connected in series between the DC/DC conversion circuit and the preceding stage circuit, the control terminal of the controllable switch 30 is connected to the control circuit 20, and the control circuit 20 outputs the first control signal or the second control signal to the controllable switch according to the detection result of the inverter.
The controllable switch 30 is in an off state upon receiving the first control signal or the second control signal transmitted from the control circuit 20, thereby disconnecting the inverter from the preceding stage circuit.
Optionally, the control circuit 20 may be integrated with the inverter, or may be integrated with the controllable switch 30, so as to improve the overall integration of the system or the inverter.
Optionally, referring to fig. 6, fig. 6 is a schematic structural diagram of another inverter detection circuit provided in the embodiment of the present invention, and on the basis of the embodiment shown in fig. 5, in the inverter detection circuit provided in the embodiment, the control circuit further includes a driving circuit 202 and a voltage detection circuit 201, wherein,
the output end of the voltage detection circuit 201 is connected to the control end of the controllable switch 30 through the driving circuit 202, and the driving circuit 202 amplifies the control signal output by the voltage detection circuit 201, so as to drive the controllable switch 30 to operate.
The input terminal of the voltage detection circuit 201 is connected to the voltage sampling circuit 10, and performs the inverter detection method provided by any one of the foregoing embodiments.
Optionally, in the above embodiment, the controllable switch includes at least one of a relay, a contactor, and a semiconductor switch tube.
It should be noted that the DC/DC conversion circuits provided in the embodiments shown in fig. 4 to fig. 6 are only examples, and are not limited to the specific circuit topology of the DC/DC conversion circuit, and in practical applications, the DC/DC conversion circuit includes a two-level DC/DC conversion circuit or a multi-level DC/DC conversion circuit with more than two levels.
Optionally, an embodiment of the present invention further provides an inverter, including: a DC/DC conversion circuit, a DC/AC conversion circuit, and an inverter detection circuit according to any one of the above, wherein,
the DC/DC conversion circuit is connected with the DC/AC conversion circuit in series;
the inverter detection circuit is connected with the DC/DC conversion circuit.
Optionally, an embodiment of the present invention further provides a photovoltaic system, including: photovoltaic module, collection flow box, grid-connected transformer and the inverter that the preceding embodiment provided,
the photovoltaic module is connected with the direct current side of the inverter through the combiner box;
and the alternating current side of the inverter is connected with an alternating current power grid through the grid-connected transformer.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. An inverter detection method, comprising:
acquiring the voltage and the output duty ratio of a switching tube of a DC/DC conversion circuit in an inverter to obtain a voltage value array and a duty ratio array;
calculating the coincidence ratio of the voltage of the switching tube and the output duty ratio;
judging whether the inverter fails or not according to the relationship between the contact ratio and the contact ratio threshold value;
wherein, the calculating the coincidence ratio of the switching tube voltage and the output duty cycle comprises:
performing per-unit processing on each voltage value in the voltage value array to obtain a per-unit voltage value array;
converting each output duty ratio in the duty ratio array into a square wave signal to obtain a square wave signal array;
and calculating the coincidence ratio of the per-unit voltage value array and the square wave signal array in a time domain or a frequency domain.
2. The inverter detection method according to claim 1, wherein the obtaining of the switching tube voltage and the output duty ratio of the DC/DC conversion circuit in the inverter comprises:
in a target time period, simultaneously and respectively acquiring the voltage of a switching tube and the output duty ratio of a DC/DC conversion circuit in an inverter according to a preset sampling frequency, and acquiring a voltage value array corresponding to the voltage of the switching tube and a duty ratio array corresponding to the output duty ratio.
3. The inverter detection method according to claim 1, wherein the determining whether the inverter is in fault according to the magnitude relation between the coincidence degree and the coincidence degree threshold value comprises:
if the contact ratio is larger than or equal to a contact ratio threshold value, judging that the inverter has a fault;
and if the contact ratio is smaller than the contact ratio threshold value, judging that the inverter is normal.
4. The inverter detection method according to claim 3, further comprising, if it is determined that the inverter is faulty:
and outputting a first control signal, wherein the first control signal is used for disconnecting the inverter from a front-stage circuit or a rear-stage circuit.
5. The inverter detection method according to claim 2, wherein the preset sampling frequency is equal to N times a switching frequency of the DC/DC conversion circuit, where N is greater than 1.
6. The inverter detection method according to any one of claims 1 to 5, further comprising:
monitoring the voltage of a switching tube of the DC/DC conversion circuit;
if the voltage of the switching tube is lower than a preset voltage threshold, outputting a second control signal;
the second control signal is used for disconnecting the inverter from a front-stage circuit or a rear-stage circuit.
7. The inverter detection circuit is characterized by comprising a voltage acquisition circuit and a control circuit, wherein,
the voltage acquisition circuit is connected with a DC/DC conversion circuit in the inverter and acquires the voltage of a switching tube of the DC/DC conversion circuit;
the control circuit is connected with the voltage acquisition circuit, and the control circuit executes the inverter detection method of any one of claims 1 to 6.
8. The inverter detection circuit according to claim 7, further comprising: a controllable switch, wherein,
the controllable switch is connected in series between the DC/DC conversion circuit and the preceding stage circuit;
the control end of the controllable switch is connected with the control circuit;
and the controllable switch is in a disconnected state under the condition of receiving the first control signal or the second control signal sent by the control circuit.
9. The inverter detection circuit of claim 8, wherein the control circuit comprises a drive circuit and a voltage detection circuit, wherein,
the output end of the voltage detection circuit is connected with the control end of the controllable switch through the driving circuit;
the input end of the voltage detection circuit is connected with the voltage sampling circuit;
the voltage detection circuit performs the inverter detection method of any one of claims 1 to 6.
10. The inverter detection circuit of claim 8, wherein the control circuit is provided integrally with the inverter or the control circuit is provided integrally with the controllable switch.
11. The inverter detection circuit according to any one of claims 7 to 10, wherein the DC/DC conversion circuit includes a two-level DC/DC conversion circuit or a two-level or more multi-level DC/DC conversion circuit.
12. An inverter, comprising: a DC/DC conversion circuit, a DC/AC conversion circuit, and the inverter detection circuit according to any one of claims 7 to 11,
the DC/DC conversion circuit is connected with the DC/AC conversion circuit in series;
the inverter detection circuit is connected with the DC/DC conversion circuit.
13. A photovoltaic system, comprising: a photovoltaic module, a combiner box, a grid-tied transformer, and the inverter of claim 12,
the photovoltaic module is connected with the direct current side of the inverter through the combiner box;
and the alternating current side of the inverter is connected with an alternating current power grid through the grid-connected transformer.
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