System for functional testing of distributed power access units

Abstract

A system for functional testing of a distributed power access unit comprises: a test bench, an automatic test system, a simulation meter and a station area simulation system. The system provided by the embodiment of the present invention fills the gap in the field of distributed power access unit detection, improves the quality of distributed power access units, is conducive to the batch application of distributed power access units, and the fully automatic test software reduces the workload of equipment testing and improves the detection efficiency and detection quality.

Description

Technical Field

[0001] The present invention relates to the technical field of inverter monitoring and control, and in particular to a system for performing functional testing on a distributed power supply access unit. Background Art

[0002] my country's energy has begun to shift to renewable energy development, mainly distributed photovoltaics. The large-scale grid connection of distributed photovoltaics will bring huge challenges to the safe operation and maintenance of the power system. In order to strengthen the information monitoring and regulation of distributed photovoltaics, a distributed power access unit is designed and developed to uniformly monitor and control distributed power sources. At present, there is a lack of detection methods and systems for distributed power access units that can fully verify their functions, which is not conducive to equipment quality control and unified promotion and application. Summary of the invention

[0003] In view of this, the present invention proposes a system for performing functional testing on a distributed power supply access unit, aiming to solve the above technical problem.

[0004] In the first aspect, an embodiment of the present invention provides a system for performing functional testing on a distributed power supply access unit, including: a test bench body, used to install a device under test, provide power for the device under test, and provide a communication platform between the device under test and an automatic test system; an automatic test system, used to forward instructions sent by the test bench body to the device under test to a simulation meter, and forward data returned by the simulation meter to the test bench body, obtain test results based on the test data sent by the test bench body to the device under test, and return feedback results after judging the data fed back by the substation simulation system; the simulation meter, used to return data to the automatic test system based on the instructions of the device under test forwarded by the automatic test system, and output data to the substation simulation system; the substation simulation system, used to simulate the electrical parameter change data of each node based on the output data of the simulation meter and feed it back to the automatic test system to receive the feedback results.

[0005] Furthermore, the test bench also includes: each test table is designed with a communication interface that is the same as the distributed power supply access unit interface, which is used to realize the communication connection between the device under test and the test bench, and the device under test communicates with the automatic test software through the test bench.

[0006] Furthermore, the automatic testing system is also used to: select test items according to requirements, set test parameters, control test progress, display test progress, test results, interact with simulation meters for data, interact with data collection of the device under test, judge the feedback results of the substation simulation system, automatically test the device under test item by item and output the results.

[0007] Furthermore, the simulation meter is also used to: based on the instructions of the device under test forwarded by the automatic test system, feed back the control results to the automatic test system, and feed back the output and status data to the station simulation system.

[0008] Furthermore, the analog meter is also used to provide a communication protocol for the analog meter and expand a new communication protocol.

[0009] Furthermore, the simulation table includes: a simulated inverter, simulated energy storage, a simulated circuit breaker and a simulated charging pile; wherein the simulated inverter, simulated energy storage, simulated circuit breaker and simulated charging pile are respectively used as actual devices to be tested, and communicate with the devices to be tested through the automatic test system and the test bench to complete the inverter, energy storage, circuit breaker, charging pile output control, data collection and status reporting.

[0010] Furthermore, the simulated circuit breaker is also used for: when the automatic test system collects circuit breaker data of the device under test, the device under test sends a collection instruction to the test system to collect circuit breaker data, and the simulated circuit breaker verifies the collection instruction and returns the corresponding data; when the circuit breaker status is reported, the circuit breaker sends a reporting event to the device under test through the test system, and the device under test processes the reporting time; when the automatic test system controls the device under test to control the circuit breaker, the device under test sends a circuit breaker control instruction to the test system to control the circuit breaker to open and close, the simulated circuit breaker feeds back the control result, and feeds back the opening and closing status to the substation simulation system.

[0011] Furthermore, the substation simulation system, including substation topology, line parameters, photovoltaic, energy storage location and output parameters, circuit breaker location and status, is also used to: change the load and node on-off according to the output data of the simulation table to simulate the electrical parameter change data of each node and feed it back to the automatic test system.

[0012] The system for functional testing of distributed power access units provided in an embodiment of the present invention includes a test bench, an automatic test system, a simulation meter, and a substation simulation system, which fills the gap in the field of distributed power access unit detection, improves the quality of distributed power access units, and is conducive to the batch application of distributed power access units. The fully automatic test software reduces the workload of equipment testing and improves detection efficiency and detection quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic structural diagram of a system for performing functional testing on a distributed power supply access unit according to an embodiment of the present invention is shown;

[0014] Figure 2 A schematic structural diagram of a system for performing functional testing on a distributed power supply access unit according to an embodiment of the present invention is shown;

[0015] Figure 3A schematic diagram of an operation interface of a system for performing a functional test on a distributed power supply access unit according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0016] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0017] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0018] Figure 1 A structural schematic diagram of a system for performing functional testing on a distributed power supply access unit according to an embodiment of the present invention is shown.

[0019] like Figure 1 As shown, the system comprises:

[0020] The test bench body 101 is used to install the device under test, provide power to the device under test, and provide a communication platform between the device under test and the automatic test system;

[0021] The automatic test system 102 is used to forward the instructions of the device under test sent by the test bench to the simulation meter, and forward the data returned by the simulation meter to the test bench, obtain the test results based on the test data of the device under test sent by the test bench, and return the feedback results after judging the data fed back by the bench area simulation system;

[0022] The simulation table 103 is used to return data to the automatic test system based on the instructions of the device under test forwarded by the automatic test system, and output data to the station area simulation system;

[0023] The substation simulation system 104 is used to simulate the electrical parameter change data of each node based on the output data of the simulation table and feed back the data to the automatic test system to receive the feedback result.

[0024] Furthermore, the test bench 101 further includes:

[0025] Each test station is designed with a communication interface that is the same as the interface of the distributed power supply access unit, which is used to realize the communication connection between the device under test and the test bench. The device under test communicates with the automatic test software through the test bench.

[0026] Specifically, the test bench is the hardware part, the device under test is installed on the test bench, which provides power supply and monitoring circuit for the device under test. Each test table is designed with a communication interface that is the same as the interface of the distributed power supply access unit to realize the communication connection between the device under test and the test bench. The device under test communicates with the automatic testing software through the test bench.

[0027] Furthermore, the automatic testing system 102 is also used for:

[0028] According to the requirements, select test items, set test parameters, control test progress, display test progress and test results, interact with the simulation table for data, interact with the data collection of the device under test, judge the feedback results of the substation simulation system, automatically test the device under test item by item and output the results.

[0029] Specifically, the automatic testing system is an automated software that can select test items, set test parameters, control test progress, display test progress and test results, interact with simulation tables for data, interact with data collection of the device under test, etc. It can judge the feedback results of the simulation area system, automatically test the device under test item by item and output the results.

[0030] Furthermore, the analog meter 103 is also used for:

[0031] Based on the instructions of the device under test forwarded by the automatic test system, the control results are fed back to the automatic test system, and the output and status data are fed back to the station simulation system.

[0032] Furthermore, the analog meter 103 is also used for:

[0033] Provide communication protocols for analog meters and expand new communication protocols.

[0034] Furthermore, the simulation table 103 includes:

[0035] Simulate inverters, simulate energy storage, simulate circuit breakers and simulate charging piles;

[0036] Among them, the simulated inverter, simulated energy storage, simulated circuit breaker and simulated charging pile are used as the actual equipment to be tested, and communicate with the equipment to be tested through the automatic test system and the test bench to complete the inverter, energy storage, circuit breaker, charging pile output control, data collection and status reporting.

[0037] Furthermore, the simulated circuit breaker is also used to:

[0038] When the automatic test system collects the circuit breaker data of the device under test, the device under test sends a collection instruction to the test system to collect the circuit breaker data, and the simulated circuit breaker verifies the collection instruction and returns the corresponding data;

[0039] When the circuit breaker status is reported, the circuit breaker sends a reporting event to the device under test through the test system, and the device under test processes the reporting time;

[0040] When the automatic test system controls the device under test to control the circuit breaker, the device under test sends a circuit breaker control instruction to the test system to control the opening and closing of the circuit breaker, simulates the circuit breaker to feedback the control result, and feeds back the opening and closing status to the substation simulation system.

[0041] Specifically, the simulation table is a communication protocol library for inverters, energy storage, circuit breakers, and charging piles. It can add new protocols and can communicate with the device under test as the actual device under test. It can complete operations such as inverter, energy storage, circuit breaker, and charging pile output control and data collection. When the automatic test system collects photovoltaic data from the device under test, the device under test issues a collection instruction to the test system to collect data, and the simulation table verifies the collection instruction and returns the corresponding data; when the automatic test system controls the device under test to control the inverter, energy storage, circuit breaker, and charging pile, the device under test issues a control instruction to the test system, and the simulation table feeds back the control result, and feeds back the inverter output data to the station simulation system.

[0042] Figure 2 A schematic structural diagram of a system for performing functional testing on a distributed power supply access unit according to an embodiment of the present invention is shown. Figure 2 As shown, the simulated circuit breaker (part of the simulation table) is a communication protocol for various circuit breakers. It can be expanded with new circuit breaker protocols, can be used as an actual circuit breaker to communicate with the device under test, and can complete circuit breaker control, data collection, status reporting and other operations. When the automatic test system collects the circuit breaker data of the device under test, the device under test issues a collection instruction to the test system to collect the circuit breaker data, and the simulated circuit breaker verifies the collection instruction to return the corresponding data; when the circuit breaker status is reported, the circuit breaker issues a reporting event to the device under test through the test system, and the device under test processes the reporting time; when the automatic test system controls the device under test to control the circuit breaker, the device under test issues a circuit breaker control instruction to the test system to control the circuit breaker to open and close, and the simulated circuit breaker feeds back the control result, and feeds back the opening and closing status to the area simulation system.

[0043] Furthermore, the substation simulation system 104, including substation topology, line parameters, photovoltaic, energy storage location and output parameters, circuit breaker location and status, is also used for:

[0044] According to the output data of the simulation table, the load and node on / off are changed to simulate the change data of the electrical parameters of each node and feed it back to the automatic test system.

[0045] Specifically, the substation simulation system is a digital simulation of photovoltaic active substations, which includes substation topology relationships, line parameters, photovoltaics, energy storage location and output parameters, circuit breaker location and status and other information. It can change the load and node on-off according to the simulated inverter, energy storage charging pile output data and simulated circuit breaker output data to simulate the electrical parameter change data of each node and feed it back to the automatic test system.

[0046] The system for performing functional testing on a distributed power access unit provided in an embodiment of the present invention is used in the following manner:

[0047] 1. Install the device under test on the test bench;

[0048] 2. Open the host computer photovoltaic inverter monitoring and control equipment test system, check the test items, and start the test; Figure 3 A schematic diagram of an operation interface of a system for performing a functional test on a distributed power supply access unit according to an embodiment of the present invention is shown. Figure 3 As shown, the default settings of the simulated inverter and simulated circuit breaker parameters are completed;

[0049] 3. The analog meter can set the inverter, energy storage, charging pile type and protocol, output parameters and other information;

[0050] 4. The simulated circuit breaker can set the circuit breaker type and protocol, output parameters and other information;

[0051] 5. The simulation substation system can set line parameters, photovoltaic location and other information.

[0052] For the system for functional testing of a distributed power access unit provided by an embodiment of the present invention, the distributed power access unit-local control function test is as follows:

[0053] a) Island protection function:

[0054] 1. The automatic test system controls the frequency fluctuation and voltage fluctuation of the control body;

[0055] 2. Inspection point 1: The island protection function is triggered on the tested prototype;

[0056] 3. Inspection point 2: The tested sample reports an islanding event;

[0057] 4. Inspection point 3: The tested prototype issues a circuit breaker tripping command within 2 seconds.

[0058] b) Voltage over-limit control function:

[0059] 1. The automatic test system controls the voltage of the control unit to exceed the limit;

[0060] 2. Inspection point 1: The voltage over-limit control function of the tested prototype;

[0061] 3. Inspection point 2: The tested sample reports a voltage limit-exceeding event;

[0062] 4. Inspection point 3: The tested prototype issues a control command;

[0063] 5. The analog meter receives the control command and returns the output control to the simulation area, which simulates the grid-connected point voltage value;

[0064] 6. Inspection point 4: The automatic test system compares the grid connection point voltage with the control target voltage. If the grid connection point voltage is less than the control target voltage, it is qualified.

[0065] c) Over-capacity grid-connected control function:

[0066] 1. The automatic test system controls the grid-connected power generation capacity of the control unit to exceed the limit;

[0067] 2. Inspection point 1: The tested prototype triggers the over-capacity grid-connected control function;

[0068] 3. Inspection point 2: The tested sample reports an over-capacity event;

[0069] 4. Inspection point 3: The tested prototype issues a control command;

[0070] 5. Inspection point 4: The control command value is equal to the PV installed capacity.

[0071] The above-mentioned embodiment provides a system for performing functional testing on a distributed power access unit, including a test bench, an automatic testing system, a simulation meter, and a substation simulation system, which fills the gap in the field of distributed power access unit detection, improves the quality of distributed power access units, and is conducive to the batch application of distributed power access units. The fully automatic testing software reduces the workload of equipment testing and improves the detection efficiency and detection quality.

[0072] Furthermore, the system for performing functional testing on a distributed power supply access unit provided in the above embodiment has the following advantages:

[0073] 1. The current test software has a single function and is complex to operate. This technical solution designs each test item as an independent test module according to the equipment standard requirements. Single or multiple test items can be tested at a time by clicking. The test item results are refined to every requirement, and can intuitively display the overall pass or fail, each item pass or fail, and each point pass or fail.

[0074] 2. Currently, there is a lack of testing systems and methods. This technical solution is based on the equipment standard requirements, and the test system is designed to replace the actual inverters, circuit breakers, energy storage, charging piles and other equipment by simulation. The simulated inverters, circuit breakers, energy storage, and charging piles can simulate the communication, control, and monitoring functions of most inverters, circuit breakers, energy storage, and charging piles on the market. In conjunction with the test system, the acquisition, monitoring, and control function tests of all inverters, circuit breakers, energy storage, charging piles and other equipment can be completed in a short time without manually changing the wiring and switching the inverter, reducing the test workload and increasing the richness of the test.

[0075] 3. Currently, there are no functions and methods for testing the control effects of inverters, energy storage, circuit breakers, etc. This technical solution designs a simulation substation system according to the equipment standard requirements, combines the changes in the electrical parameters of inverters, energy storage, and circuit breakers, simulates the changes in electrical quantities such as voltage, current, active power, reactive power, and power factor at the grid connection point, tests whether the local control function of the distributed power access unit has the expected control effect on the grid-connected power system, and detects whether the product functions meet the requirements.

[0076] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0077] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0078] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0079] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0080] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0081] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A system for functional testing of a distributed power access unit, characterized in that: The system comprises: The test bench is used to install the device under test, provide power to the device under test, and provide a communication platform between the device under test and the automatic test system; An automatic test system, used for forwarding the instruction sent by the test bench to the device under test to the simulation meter, and forwarding the data returned by the simulation meter to the test bench, obtaining the test result based on the test data sent by the test bench to the device under test, and returning the feedback result after judging the data fed back by the bench area simulation system; A simulation table, for returning data to the automatic test system based on the instructions of the device under test forwarded by the automatic test system, and outputting data to the station simulation system; A substation simulation system, used to simulate the electrical parameter change data of each node based on the output data of the simulation table and feed back the data to the automatic test system to receive the feedback result; The substation simulation system includes substation topology, line parameters, photovoltaic, energy storage location and output parameters, circuit breaker location and status, and is also used for: According to the output data of the simulation table, the load and node on / off are changed to simulate the change data of the electrical parameters of each node and the data are fed back to the automatic test system; Wherein, the simulation table includes: Simulate inverters, simulate energy storage, simulate circuit breakers and simulate charging piles; Among them, the simulated inverter, simulated energy storage, simulated circuit breaker and simulated charging pile are respectively used as actual devices to be tested, and communicate with the devices to be tested through the automatic test system and the test bench to complete the inverter, energy storage, circuit breaker, charging pile output control, data collection and status reporting.

2. The system according to claim 1, characterized in that The test bench also includes: Each test station is designed with a communication interface that is the same as the interface of the distributed power supply access unit, which is used to realize the communication connection between the device under test and the test bench. The device under test communicates with the automatic test software through the test bench.

3. The system according to claim 1, characterized in that The automatic testing system is also used for: According to the requirements, select test items, set test parameters, control test progress, display test progress and test results, interact with the simulation table for data, interact with the data collection of the device under test, judge the feedback results of the substation simulation system, automatically test the device under test item by item and output the results.

4. The system according to claim 1, characterized in that The analog meter is also used for: Based on the instructions of the device under test forwarded by the automatic test system, the control results are fed back to the automatic test system, and the output and status data are fed back to the station area simulation system.

5. The system according to claim 1, characterized in that The analog meter is also used for: Provide communication protocols for analog meters and expand new communication protocols.

6. The system according to claim 1, characterized in that The simulated circuit breaker is also used for: When the automatic test system collects the circuit breaker data of the device under test, the device under test sends a collection instruction to the test system to collect the circuit breaker data, and the simulated circuit breaker verifies the collection instruction and returns the corresponding data; When the circuit breaker status is reported, the circuit breaker sends a reporting event to the device under test through the test system, and the device under test processes the reporting time; When the automatic test system controls the device under test to control the circuit breaker, the device under test sends a circuit breaker control instruction to the test system to control the opening and closing of the circuit breaker, simulates the circuit breaker to feedback the control result, and feeds back the opening and closing status to the substation simulation system.

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