CN112557783A - Grid-connected detection system and method for converter equipment - Google Patents
Grid-connected detection system and method for converter equipment Download PDFInfo
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Abstract
The invention is suitable for the technical field of equipment detection, and provides a grid-connected detection system and a method for converter equipment, wherein the system comprises the following components: the system comprises a photovoltaic simulator, an information acquisition module, a switch module and an auxiliary detection device, wherein the auxiliary detection device comprises a power grid simulator and a low voltage ride through experiment device; the switch module comprises a first switch, a second switch and a third switch; the working states of the photovoltaic simulator and the auxiliary detection device and the switching states of all switches in the switch module are controlled, so that the tested equipment is in different test loops; and determining corresponding test results when the tested equipment is in different test loops according to the direct current signals and the alternating current signals when the tested equipment is in different test loops, so that the redundancy of the system is reduced, the comprehensiveness of the system on the detection of the converter equipment is improved, and the operation safety of the power system is further improved.
Description
Technical Field
The invention belongs to the technical field of equipment detection, and particularly relates to a grid-connected detection system and method for a converter device.
Background
With the technical progress of the new energy field and the increase of the number of enterprises, the new energy industry is more competitive, equipment manufacturers seize the market by pressing down the cost, so that the quality of equipment is reduced, and if the performance of the power electronic equipment cannot meet the requirements of national standards, the power electronic equipment may have serious influence on a power system. Therefore, the development of a detection system of the power electronic converter equipment is of great significance.
At present, a detection system of an existing power electronic converter device can only test and evaluate a specific type of device, for example, a detection system of a photovoltaic inverter can only test the performance of the photovoltaic inverter, a detection system of an energy storage converter can only test the performance of the energy storage converter, and the detection items are single and the test is not comprehensive enough.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a grid-connected detection system and method for a converter device, so as to solve the problem that the detection performance of the converter device detection system in the prior art is not comprehensive enough.
A first aspect of an embodiment of the present invention provides a grid-connected detection system for a converter device, including:
the system comprises a photovoltaic simulator, an information acquisition module, a switch module and an auxiliary detection device, wherein the auxiliary detection device comprises a power grid simulator and a low voltage ride through experiment device; the switch module comprises a first switch, a second switch and a third switch;
the first end of the photovoltaic simulator is connected with the side of a power grid, and the second end of the photovoltaic simulator is connected with the direct current end of the tested equipment; the first end of the power grid simulator and the first end of the first switch are respectively connected with the power grid side, and the second end of the power grid simulator is connected with the alternating current end of the tested device through the second switch; the second end of the first switch is connected with the alternating current end of the tested device; the low voltage ride through experiment device is connected with the first end of the first switch through the third switch;
the information acquisition module is respectively connected with the direct current end and the alternating current end of the equipment to be tested and is used for acquiring direct current signals and alternating current signals of the equipment to be tested.
A second aspect of the embodiments of the present invention provides a grid-connected detection method for a converter device, which is applied to the grid-connected detection system for a converter device described above, and the method includes:
controlling the working states of the photovoltaic simulator and the auxiliary detection device and the switching states of all switches in the switch module so as to enable the tested equipment to be in different test loops;
and acquiring the direct current signal and the alternating current signal when the tested equipment is positioned in different test loops, and determining corresponding test results when the tested equipment is positioned in different test loops according to the direct current signal and the alternating current signal when the tested equipment is positioned in different test loops.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: this embodiment provides a grid-connected detection system of convertor equipment, includes: the system comprises a photovoltaic simulator, an information acquisition module, a switch module and an auxiliary detection device, wherein the auxiliary detection device comprises a power grid simulator and a low voltage ride through experiment device; the switch module comprises a first switch, a second switch and a third switch; in the embodiment, the working states of the photovoltaic simulator and the auxiliary detection device and the switching states of the switches in the switch module are controlled, so that the tested equipment is in different test loops; and determining corresponding test results when the tested equipment is in different test loops according to the direct current signals and the alternating current signals when the tested equipment is in different test loops, so that the redundancy of the system is reduced, the comprehensiveness of the system on the detection of the converter equipment is improved, and the operation safety of the power system is further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a system structure of a grid-connected detection system of a converter device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of communication connection of each device in a grid-connected detection system of a converter device according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a grid-connected detection method for a converter device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a test loop for a low voltage ride through test provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a test loop for DC on-load testing according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a test loop of an anti-islanding test provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of a test loop of a power grid abnormal protection test provided in the embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
In an embodiment, as shown in fig. 1, fig. 1 shows a grid-connection detection system of a converter device provided in this embodiment, which includes:
the system comprises a photovoltaic simulator 10, an information acquisition module, a switch module and an auxiliary detection device, wherein the auxiliary detection device comprises a power grid simulator 20 and a low voltage ride through experiment device 30; the switch module comprises a first switch K1, a second switch K2 and a third switch K3;
the first end of the photovoltaic simulator 10 is connected with the power grid side, and the second end of the photovoltaic simulator 10 is connected with the direct current end of the tested device; a first end of the grid simulator 20 and a first end of the first switch K1 are respectively connected with the grid side, and a second end of the grid simulator 20 is connected with the alternating current end of the device under test through the second switch K2; the second end of the first switch K1 is connected with the alternating current end of the tested device; the low voltage ride through experimental device 30 is connected to the first end of the first switch K1 through the third switch K3;
the information acquisition module is respectively connected with the direct current end and the alternating current end of the equipment to be tested and is used for acquiring direct current signals and alternating current signals of the equipment to be tested.
In this embodiment, the device under test may include a photovoltaic inverter, an energy storage converter, an automobile charging pile, and other converter devices.
In the present embodiment, the photovoltaic simulator 10 is configured to convert ac power on the grid side into dc power, and output dc voltage to the device under test as a dc power source.
The auxiliary detection device comprises a power grid simulator 20 and a low voltage ride through experiment device 30, and is used for detecting specific items of some types of converter equipment.
In particular, the grid simulator 20 is used to simulate conditions that may occur in a real grid, such as voltage fluctuations, frequency variations, harmonics, etc. The grid simulator 20 may be used for detection of photovoltaic inverters, energy storage converters and car charging piles.
Preferably, the energy storage converter and the charging pile both have an energy flowing process from an alternating current side to a direct current side, so the photovoltaic simulator 10 and the power grid simulator 20 selected in the embodiment both adopt devices capable of operating in two directions.
In the present embodiment, the low voltage ride through experiment apparatus 30 is used to assist the device under test (photovoltaic inverter, energy storage converter and car charging pile) to perform a low voltage ride through experiment.
The switch module comprises a plurality of switches, and the tested equipment can be positioned in different test loops by controlling the switching state of each switch in the switch module, so that different tests can be realized.
The information acquisition module is used for acquiring direct current signals and alternating current signals of the tested equipment.
Specifically, a grid-connected detection loop of the converter equipment comprises two information acquisition points, wherein a first information acquisition point A1 is positioned at the direct current end of the equipment to be tested and is used for measuring an electric signal which is input to the equipment to be tested after the alternating current of a power grid is converted into direct current by a photovoltaic simulator 10; the second information acquisition point A2 is located at the AC end of the device under test, and is used for measuring an electric signal before the direct current is converted into alternating current by the device under test and is input into a power grid. Both ac and dc electrical signals may include voltage, current, power, and the like.
In this embodiment, the information acquisition module includes a power analyzer and a recorder. The power analyzer can be selected from WT3000, and the recorder can be selected from DL 850.
As can be seen from the above embodiments, in the present embodiment, the working states of the photovoltaic simulator 10 and the auxiliary detection device and the switching states of the switches in the switch module are controlled, so that the device to be tested is in different test loops; and determining corresponding test results when the tested equipment is in different test loops according to the direct current signals and the alternating current signals when the tested equipment is in different test loops, so that the redundancy of the system is reduced, the comprehensiveness of the system on the detection of the converter equipment is improved, and the operation safety of the power system is further improved.
In one embodiment, as shown in fig. 1, the auxiliary detection device further includes a dc load 50; the switch module further comprises a fourth switch K4 and a fifth switch K5;
a first terminal of the fourth switch K4 and a first terminal of the fifth switch K5 are respectively connected to the second terminal of the photovoltaic simulator 10, a second terminal of the fourth switch K4 is connected to the first terminal of the dc load 50, and a second terminal of the dc load 50 and a second terminal of the fifth switch K5 are respectively connected to the dc terminal of the device under test.
In the present embodiment, the dc load 50 is used to meet the dc on-load test requirement of the device under test (energy storage converter, car charging pile).
In one embodiment, as shown in fig. 1, the auxiliary detection device further comprises an anti-islanding RLC load 40; the switch module further comprises a sixth switch K6;
the anti-islanding RLC load 40 is connected to the alternating current end of the tested device through the sixth switch K6.
In the present embodiment, the anti-islanding RLC load 40 is used to assist the device under test (photovoltaic inverter, energy storage converter, car charging pile) to perform an anti-islanding test.
In one embodiment, as shown in fig. 1, the switch module further includes a seventh switch K7 and an eighth switch K8;
the seventh switch K7 is connected in series between the grid side and the first end of the photovoltaic simulator 10; the eighth switch K8 is connected in series between the grid side and the first end of the first switch K1.
In one embodiment, the system further comprises a centralized control device, which is respectively connected in communication with the photovoltaic simulator 10, the information collecting module, the first switch K1, the second switch K2, the third switch K3, the grid simulator 20, the low voltage ride through experimental device 30 and the device under test.
In an embodiment of the present invention, as shown in fig. 2, fig. 2 is a schematic diagram illustrating communication connections of each device in a grid-connected detection system of a converter device provided in this embodiment.
In the present embodiment, as shown in fig. 2, the centralized control device includes a switch cabinet PLC71, a serial server 72, a switch 73, a server 74, a database 75, and a client 76.
Specifically, the first switch K1 to the eighth switch K8 of the switch module are respectively connected with the switch cabinet PLC71, the grid simulator 20, the photovoltaic simulator 10, the low voltage ride through experimental apparatus 30, the dc load 50, the anti-islanding RLC load 40, the switch cabinet PLC71, the power analyzer 80, and the wave recorder 90 are respectively connected with the serial server 72, the serial server 72 is connected with the server 74 through the switch 73, and the server 74 is respectively connected with the database 75 and the client 76.
In this embodiment, the client 76 is configured to obtain an instruction input by a user, and send the instruction to the server 74, and the server 74 receives the instruction sent by the client 76, generates a control instruction of a corresponding device according to the instruction, and sends the control instruction of the corresponding device to the corresponding device through the switch 73 and the serial server 72. The server 74 is further configured to obtain the ac signal and the dc signal of the device under test obtained by the power analyzer 80 and the wave recorder 90, and perform data processing according to the ac signal and the dc signal to determine test results of the device under test in different test items. And returns the test results to the client 76. The server 74 is also connected to a database 75, and stores data during the test in the database 75.
In this embodiment, all devices may transmit signals through the RS485 bus, but different devices use different communication protocols.
Illustratively, the power grid simulator 20, the photovoltaic simulator 10 and the switch cabinet PLC71 are connected with the serial server 72 through a Modbus communication protocol; the low voltage ride through experimental device 30, the anti-islanding RLC load 40 and the direct current load 50 are connected with the serial server 72 through a factory-defined protocol format, and the power analyzer 80 and the oscilloscope are in communication connection with the serial server 72 through API interfaces.
In this embodiment, the software component of the detection system in the server 74 may adopt Microsoft Visual Studio (abbreviated as VS or MSVS) integrated development environment, and develop the software system using a more flexible object-oriented C # high-level language.
In an embodiment of the present invention, as shown in fig. 3, fig. 2 shows an implementation flow of a grid-connected detection method for a converter device, where the method is applied to a grid-connected detection system for the converter device, and a process of the method is detailed as follows:
s101: controlling the working states of the photovoltaic simulator 10 and the auxiliary detection device and the switching states of the switches in the switch module so as to enable the tested equipment to be in different test loops;
s102: and acquiring the direct current signal and the alternating current signal when the tested equipment is positioned in different test loops, and determining corresponding test results when the tested equipment is positioned in different test loops according to the direct current signal and the alternating current signal when the tested equipment is positioned in different test loops.
In one embodiment, the test loop comprises a low voltage ride through test loop; s101 in fig. 3 specifically includes:
according to the low voltage ride through test instruction, the first switch K1, the third switch K3, the fifth switch K5, the seventh switch K7 and the eighth switch K8 are controlled to be closed, the second switch K2, the fourth switch K4 and the sixth switch K6 are controlled to be opened, and the low voltage ride through experiment device 30, the photovoltaic simulator 10 and the tested device are controlled to be opened, so that the tested device is in the low voltage ride through experiment test loop.
In this embodiment, the low voltage ride through test loop is used for measuring a basic electrical signal of the device under test during a fault period after the voltage on the power grid side is abnormal and recovers to normal in a short time, and determining whether the device under test has a certain energy capable of withstanding abnormal voltage.
Specifically, as shown in fig. 4, fig. 4 shows a schematic diagram of a test loop of the low voltage ride through test, and a specific implementation flow of the low voltage ride through test includes:
s201: the tester sends a low voltage ride through test command at the client 76 to the server 74;
s202: the server 74 controls the switch cabinet PLC71 to close the first switch K1, the fifth switch K5, the seventh switch K7 and the eighth switch K8 according to the low voltage ride through test command;
s203: starting the photovoltaic simulator 10, the tested equipment and the low voltage ride through experimental device 30;
s204: the signal acquisition module acquires the direct current signal and the alternating current signal of the equipment to be tested at the current moment and sends the direct current signal and the alternating current signal to the server 74;
s205: the server 74 judges whether the device to be tested is in a stable operation state or not according to the direct current signal and the alternating current signal, and jumps to S206 if the device to be tested is judged to be in the stable operation state, and waits for a delay and jumps to S204 if the device to be tested is judged not to be in the stable operation state;
s206: the server 74 controls the switch cabinet PLC71 to close the third switch K3; the low voltage ride through experiment device 30 is adjusted to a standby state;
s207: the server 74 controls the switch cabinet PLC71 to open the fifth switch K5;
s208: the signal acquisition module acquires direct current signals of the tested equipment at the current moment, namely the voltage and the current of a first information acquisition point A1, and judges whether the voltage and the current at the current moment are zero or not, if the voltage and the current at the current moment are zero, the step is switched to S209, and if the voltage and the current at the current moment are not zero, the step is switched to S207;
s209: the low voltage ride through provides low voltage power to the device under test until after a period of time, the server 74 controls the switch cabinet to close the fifth switch K5;
s210: the signal acquisition module acquires alternating current signals of the equipment to be tested, namely voltage and current of a second information acquisition point A2, and judges whether voltage and current of a second information acquisition point A2 before and after the fifth switch K5 is switched off have obvious changes, if the voltage and current have obvious changes, the low voltage ride through test of the equipment to be tested is proved to fail, and if the voltage and current do not have obvious changes, the low voltage ride through test of the equipment to be tested is proved to be successful;
s211: and (4) disconnecting the direct current load test loop and cutting off each device.
In one embodiment, the test loop comprises a dc on-load test loop; s101 in fig. 3 specifically includes:
according to the anti-islanding test instruction, a first switch K1, a fifth switch K5, a sixth switch K6, a seventh switch K7 and an eighth switch K8 are controlled to be closed, a second switch K2, a third switch K3 and a fourth switch K4 are controlled to be opened, and an anti-islanding RLC load 40, the photovoltaic simulator 10 and the tested equipment are controlled to be opened, so that the tested equipment is in the anti-islanding test loop.
In this embodiment, as shown in fig. 5, fig. 5 is a schematic diagram of a test loop of a dc on-load test, where a specific implementation flow of the dc on-load test includes:
s301: the tester sends a dc on-load test command to the server 74 at the client 76;
s302: the server 74 controls the switch cabinet PLC71 to close the first switch K1, the fourth switch K4, the seventh switch K7 and the eighth switch K8 according to the direct-current on-load test instruction;
s303: starting the photovoltaic simulator 10 and the equipment to be tested, and adjusting the size of the direct current load 50;
s304: adjusting the tested equipment to work at 30%, 50%, 70% and 100% load points respectively;
s305: when the tested device works at the load point, the active power and the reactive power corresponding to a second information acquisition point A2 when the tested device works at the load point are measured through the information acquisition module;
s306: the server 74 calculates the power factor corresponding to each load point according to the active power and the reactive power of the second information acquisition point a2 corresponding to each load point, and stores the power factor in the database 75;
s307: and (4) disconnecting the direct current load test loop and cutting off each device.
In one embodiment, the test loop comprises an anti-islanding test loop; s101 in fig. 3 specifically includes:
according to the anti-islanding test instruction, a first switch K1, a fifth switch K5, a sixth switch K6, a seventh switch K7 and an eighth switch K8 are controlled to be closed, a second switch K2, a third switch K3 and a fourth switch K4 are controlled to be opened, and an anti-islanding RLC load 40, the photovoltaic simulator 10 and the tested equipment are controlled to be opened, so that the tested equipment is in the anti-islanding test loop.
In this embodiment, as shown in fig. 6, fig. 6 shows a schematic diagram of an anti-islanding test loop, specifically, the anti-islanding test flow specifically includes:
s401: the tester sends an anti-islanding test instruction to the server 74 at the client 76;
s402: the server 74 controls the switch cabinet PLC71 to close the first switch K1, the fifth switch K5, the seventh switch K7 and the eighth switch K8 according to the anti-islanding test instruction;
s403: starting the photovoltaic simulator 10, the tested equipment and the anti-islanding RLC load 40;
s404: adjusting the tested device, and controlling the power of the tested device to be 33%, 66% and 100% of the rated power respectively;
s405: the server 74 acquires the alternating current signal and the direct current signal of the equipment to be tested at the current moment, and judges whether the equipment to be tested is in a stable operation state or not according to the direct current signal and the alternating current signal, if the equipment to be tested is judged to be in the stable operation state, the step jumps to S406, and if the equipment to be tested is judged not to be in the stable operation state, the step of delaying to wait and the step of S405 is repeatedly executed;
s406: the server 74 obtains the steady state output current and power measured at the second information acquisition point a 2;
s407: controlling the PLC switch cabinet to disconnect the seventh switch K7;
s408: adjusting the RLC load to make the quality factor of the RLC load between 0.95 and 1.05;
s409: closing the sixth switch K6 and the seventh switch K7 in sequence;
s410: finely adjusting the anti-islanding RLC load 40 until the fundamental frequency current measured by the first information acquisition point A1 is less than 1% of the steady-state output current of the device to be tested, turning off the seventh switch K7, and obtaining the time when the voltage waveform measured by the second information acquisition point A2 becomes zero after the seventh switch K7 is turned off;
s411: if the time from the opening of the seventh switch K7 to the time when the voltage measured by the second information acquisition point A2 becomes zero is less than 2s, the test is proved to be successful, otherwise, the test fails;
s412: and (4) disconnecting the anti-islanding test loop and cutting off each device.
In one embodiment, the test loop comprises a grid anomaly protection test loop; s101 in fig. 3 specifically includes:
according to a power grid abnormity protection test instruction, a second switch K2, a fifth switch K5, a seventh switch K7 and an eighth switch K8 are controlled to be closed, a first switch K1, a third switch K3, a fourth switch K4 and a sixth switch K6 are controlled to be opened, and a power grid simulator 20, a photovoltaic simulator 10 and the tested equipment are controlled to be opened, so that the tested equipment is in a power grid abnormity protection test loop.
In this embodiment, the power grid abnormal protection test is used to test whether the automatic tripping and the grid disconnection actions of the device to be tested, which are caused by the power grid side abnormality two, are successful when the power grid side has faults such as overvoltage, undervoltage, voltage fluctuation, harmonic wave and the like.
Specifically, as shown in fig. 7, fig. 7 shows a schematic diagram of a grid abnormal protection test loop. Specifically, a tester sends a power grid abnormal protection test instruction at a client 76, a server 74 controls a switch cabinet PLC71 to close a first switch K1, a fifth switch K5, a seventh switch K7 and an eighth switch K8 according to the power grid abnormal protection test instruction, a photovoltaic simulator 10, a device to be tested and a power grid simulator 20 are connected into a test loop, the photovoltaic simulator 10, the power grid simulator 20 and an information acquisition module are started to adjust the device to be tested, the power grid simulator 20 simulates the fault condition which may occur at the power grid side, the information acquisition module uploads the signal test results of voltage, current waveform and the like of a first information acquisition point A1 and a second information acquisition point A2 to the server, the server 74 analyzes the power grid abnormal protection test result of the device to be tested according to the voltage and current waveform of the first information acquisition point A1 and the second information acquisition point A2, and analyzes the voltage, current waveform and voltage, current of the first information acquisition point A1 and the second information acquisition point A2, The current waveform and the grid anomaly protection test result are stored in the database 75.
As can be seen from the foregoing embodiments, the grid-connected detection system for converter devices provided in this embodiment can meet the detection requirements of various power electronic converter devices such as a photovoltaic inverter, an energy storage converter, and a dc charging pile; the detection performance is comprehensive; the performance detection of three converter devices, namely a photovoltaic inverter, an energy storage converter and a direct-current charging pile, has the same aspect and also has different aspects, and the system provided by the embodiment can realize the detection of the same detection item of the converter devices and can also realize the detection of different detection items. On the other hand, the embodiment can detect electric quantity parameters such as conventional voltage, power and the like of the converter equipment, and can perform direct-current on-load, anti-islanding and low-voltage ride through tests through switching of the auxiliary detection device, so that the detection requirements of various tested equipment are met. And the system is combined through switching according to the detection requirement, the redundancy of the system is reduced, the operation is convenient, and the test result is stored in the database 75 and can be consulted at any time.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A grid-connected detection system of converter equipment is characterized by comprising: the system comprises a photovoltaic simulator, an information acquisition module, a switch module and an auxiliary detection device, wherein the auxiliary detection device comprises a power grid simulator and a low voltage ride through experiment device; the switch module comprises a first switch, a second switch and a third switch;
the first end of the photovoltaic simulator is connected with the side of a power grid, and the second end of the photovoltaic simulator is connected with the direct current end of the tested equipment; the first end of the power grid simulator and the first end of the first switch are respectively connected with the power grid side, and the second end of the power grid simulator is connected with the alternating current end of the tested device through the second switch; the second end of the first switch is connected with the alternating current end of the tested device; the low voltage ride through experiment device is connected with the first end of the first switch through the third switch;
the information acquisition module is respectively connected with the direct current end and the alternating current end of the equipment to be tested and is used for acquiring direct current signals and alternating current signals of the equipment to be tested.
2. The grid-tie detection system for converter equipment according to claim 1, wherein said auxiliary detection device further comprises a dc load; the switch module further comprises a fourth switch and a fifth switch;
the first end of the fourth switch and the first end of the fifth switch are respectively connected with the second end of the photovoltaic simulator, the second end of the fourth switch is connected with the first end of the direct current load, and the second end of the direct current load and the second end of the fifth switch are respectively connected with the direct current end of the tested device.
3. The grid-tie detection system for converter equipment according to claim 1, wherein the auxiliary detection device further comprises an anti-islanding RLC load; the switch module further comprises a sixth switch;
and the anti-islanding RLC load is connected to the alternating current end of the tested device through the sixth switch.
4. The grid-tie detection system for inverter devices of claim 1, wherein the switch module further comprises a seventh switch and an eighth switch;
the seventh switch is connected in series between the grid side and the first end of the photovoltaic simulator; the eighth switch is connected in series between the grid side and the first end of the first switch.
5. The grid-connected detection system for converter equipment according to claim 1, further comprising a centralized control device, wherein the centralized control device is in communication connection with the photovoltaic simulator, the information acquisition module, the first switch, the second switch, the third switch, the grid simulator, the low voltage ride through experimental device, and the equipment under test, respectively.
6. A grid-connection detection method of converter equipment is characterized by being applied to a grid-connection detection system of the converter equipment as claimed in any one of claims 1 to 5, and the method comprises the following steps:
controlling the working states of the photovoltaic simulator and the auxiliary detection device and the switching states of all switches in the switch module so as to enable the tested equipment to be in different test loops;
and acquiring the direct current signal and the alternating current signal when the tested equipment is positioned in different test loops, and determining corresponding test results when the tested equipment is positioned in different test loops according to the direct current signal and the alternating current signal when the tested equipment is positioned in different test loops.
7. The grid-tie detection method for the converter equipment according to claim 6, wherein the test loop comprises a low voltage ride through test loop;
the control photovoltaic simulator and auxiliary detection device's operating condition and the switching state of each switch in the switch module to make equipment under test be in different test circuit, include:
and controlling the first switch, the third switch, the fifth switch, the seventh switch and the eighth switch to be closed, the second switch, the fourth switch and the sixth switch to be opened and closed according to the low voltage ride through test instruction, and controlling the low voltage ride through experiment device, the photovoltaic simulator and the tested equipment to be opened so as to enable the tested equipment to be in the low voltage ride through experiment test loop.
8. The grid-connection detection method for the converter equipment as claimed in claim 6, wherein the test loop comprises a direct current on-load test loop;
the control photovoltaic simulator and auxiliary detection device's operating condition and the switching state of each switch in the switch module to make equipment under test be in different test circuit, include:
and controlling the first switch, the fourth switch, the seventh switch and the eighth switch to be closed, the second switch, the third switch, the fifth switch and the sixth switch to be opened according to the direct-current on-load test instruction, and controlling the direct-current load, the photovoltaic simulator and the tested equipment to be opened so as to enable the tested equipment to be in the direct-current on-load test loop.
9. The grid-tie detection method for converter equipment according to claim 6, wherein the test loop comprises an anti-islanding test loop;
the control photovoltaic simulator and auxiliary detection device's operating condition and the switching state of each switch in the switch module to make equipment under test be in different test circuit, include:
according to the anti-islanding test instruction, the first switch, the fifth switch, the sixth switch, the seventh switch and the eighth switch are controlled to be closed, the second switch, the third switch and the fourth switch are controlled to be opened, and the anti-islanding RLC load, the photovoltaic simulator and the tested equipment are controlled to be opened, so that the tested equipment is located in the anti-islanding test loop.
10. The grid-connection detection method for the converter equipment as claimed in claim 6, wherein the test circuit comprises a grid abnormal protection test circuit;
the control photovoltaic simulator and auxiliary detection device's operating condition and the switching state of each switch in the switch module to make equipment under test be in different test circuit, include:
and controlling the second switch, the fifth switch, the seventh switch and the eighth switch to be closed, and the first switch, the third switch, the fourth switch and the sixth switch to be opened according to the power grid abnormal protection test instruction, and controlling the power grid simulator, the photovoltaic simulator and the tested equipment to be opened so as to enable the tested equipment to be in the power grid abnormal protection test loop.
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