CN110824288A - High-voltage test system and test method for photovoltaic inverter - Google Patents
High-voltage test system and test method for photovoltaic inverter Download PDFInfo
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- CN110824288A CN110824288A CN201911276317.7A CN201911276317A CN110824288A CN 110824288 A CN110824288 A CN 110824288A CN 201911276317 A CN201911276317 A CN 201911276317A CN 110824288 A CN110824288 A CN 110824288A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a high-voltage test system and a high-voltage test method for a photovoltaic inverter. A photovoltaic inverter high-voltage testing method comprises the following steps: s1: starting a photovoltaic inverter high-voltage test system; s2: self-checking a power supply loop; s3: the main loop supplies power; s4: boosting the voltage of a voltage regulator; s5: judging whether the inverter detection and setting is passed or not; s6: and judging the obtained test waveform and the test result according to an automatic test program. The invention can realize the real-time monitoring function, set up the multi-level logic protection and establish the control failure protection scheme. Secondary development is realized, correct configuration of test parameters is ensured, and openness and universality are realized.
Description
Technical Field
The invention relates to the field of photovoltaics, in particular to a photovoltaic inverter high-voltage test system and a test method.
Background
With the increasingly prominent energy problem, the development of new energy is generally regarded as important worldwide. The total installed amount of new energy represented by a fan and a photovoltaic increases continuously and rapidly. The photovoltaic inverter is used as a core part of a photovoltaic power generation system, and the power generation efficiency is directly influenced. In order to guarantee the factory quality of the photovoltaic inverter, strict routine tests are required to be carried out on the photovoltaic inverter so as to expose the quality problem and hidden danger of the photovoltaic inverter in advance.
At present, photovoltaic inverter testing mainly comprises two types of testing means, namely manual testing and automatic testing. The manual test is mainly performed by human operation, test parameters measured by various requirements are recorded by test equipment according to a debugging outline, and then parameters such as running efficiency and the like are obtained through calculation
The research aiming at the automatic test is earlier carried out, and certain results are obtained at present. CN 103645393B, "an automatic testing system and method for current transformer", proposes an automatic low-voltage testing system suitable for current transformers, which realizes the transition from manual testing to automatic testing, and solves the problems that manual testing depends on manual operation and manual judgment, and parameter setting and consistency of testing results cannot be guaranteed. The test system relates to low-voltage test, and mainly aims at low-voltage pulse and voltage and current sensor test.
CN 104155616B "a photovoltaic system converter test platform" this test platform can realize carrying out high, low pressure test to different types, different functions, photovoltaic system converter of large capacity. The method provides a new approach for realizing automatic test through the configured modularized test program and the combinable test flow, but also limits the openness and the universality of the test system.
CN 106841878A "a photovoltaic inverter testing system and method" the photovoltaic inverter testing system can improve the universality of the automated testing system and the compatibility and expansibility of the testing project. The method focuses on the realization of the functionality of the test system, less focuses on the safety of the test, and the most important and the most priority of the high-voltage test system is to ensure the safety of personnel and equipment in the test process. In addition, the PXI system is adopted, and a plurality of synchronous, high-speed and high-precision data acquisition cards are integrated in the PXI system to acquire voltage and current signals, so that the utilization of existing fixed equipment on site, such as a power analyzer and the like, is not facilitated, and the reconstruction cost is high.
Disclosure of Invention
The invention aims at the problems that various test platforms are gradually changed from manual test to automatic test and the specific implementation mode is explored, but the problem of low automation degree still exists and the problem that the safety protection consideration is still insufficient when the test platforms explore the high-voltage test capability and the high-voltage automatic test capability is also explored.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-voltage test system for a photovoltaic inverter comprises a switch cabinet, a voltage regulator, a rectification power supply input and output cabinet, a rectification power supply, the photovoltaic inverter, a grid-connected transformer input and output cabinet, a grid-connected transformer and an industrial personal computer; the method is characterized in that: the current passes through the switch cabinet, the voltage regulator, the rectification power supply input and output cabinet, the rectification power supply and the rectification power supply input and output cabinet, and an adjustable direct current voltage is output through the devices; then flows through a photovoltaic inverter, a grid-connected transformer input/output cabinet, a grid-connected transformer and a grid-connected transformer input/output cabinet; outputting three-phase alternating-current voltage through the tested photovoltaic converter, boosting the voltage through a transformer and feeding the voltage back to a 10kV power grid; the switch cabinet, the voltage regulator, the rectifying power supply input and output cabinet, the rectifying power supply, the photovoltaic inverter, the grid-connected transformer input and output cabinet and the grid-connected transformer are respectively connected with the industrial personal computer, test data of each device are displayed through the industrial personal computer, if the data exceed a set value, the industrial personal computer sends out a signal, and a worker manually controls to reduce the data value.
Furthermore, the switch cabinet, the voltage regulator, the rectification power supply input/output cabinet and the rectification power supply form a power supply part, and the photovoltaic inverter, the grid-connected transformer input/output cabinet and the grid-connected transformer form an output part.
A photovoltaic inverter high-voltage testing method comprises the following steps:
s1: and starting the high-voltage test system of the photovoltaic inverter to supply power to the industrial personal computer, the PLC, the data acquisition card and the power analyzer.
S2: self-checking of a power supply loop: the communication state of the industrial personal computer, the PLC, all the connecting equipment and the switch feedback state are ensured to be self-checked normally.
S3: main loop power supply: and the switch cabinet, the voltage regulator, the rectification power supply input and output cabinet, the rectification power supply, the grid-connected transformer input and output cabinet and the grid-connected transformer are sequentially connected.
S4: the voltage regulator boosts the voltage: and regulating the output of the voltage regulator by regulating the boosting contactor, judging whether the input voltage of the photovoltaic inverter is matched with the test required voltage, and stopping and stabilizing the voltage after the requirement is met.
S5: and judging whether the inverter detection and setting is passed or not.
And S5.1, if the inverter fails to be detected and set, reducing the voltage to a lower limit value, generating a test report, and troubleshooting the photovoltaic inverter.
And S5.2, if the inverter passes the detection and setting, starting the photovoltaic inverter and entering a configured automatic test program.
S6: and judging the obtained test waveform and the test result according to an automatic test program.
S6.1, if the test waveform and the test result meet the test parameter requirements in the automatic test program, the test is passed, the photovoltaic inverter is powered off, the voltage is reduced to a lower limit value, and a test report is generated.
S6.2, if the test waveform and the test result do not meet the requirement of the test parameters in the automatic test program, the test is not passed, the photovoltaic inverter is powered off, the voltage is reduced to a lower limit value, a test report is generated, and the photovoltaic inverter is cleared.
Further, in step S1, the data acquisition card selects PCI-6254 model to acquire data from the photovoltaic inverter.
Further, the photovoltaic inverter adopts a modbus communication protocol.
Further, multistage logic protection is adopted in the industrial personal computer: the first stage is hardware protection; the second level is manual software protection; and the third level is software automatic protection.
The invention has the beneficial effects that: the automation degree of the test system is improved, the safety protection is effectively improved, and the personal safety of test personnel is guaranteed; various parameters of the system are monitored in real time, and multi-level logic protection is set.
Drawings
FIG. 1 is an overall scheme block diagram;
FIG. 2 is a flowchart of a test procedure;
FIG. 3 is a multi-level logic protection block diagram;
FIG. 4 is a diagram of three levels of permissions.
Detailed Description
The present invention will be further described with reference to the following embodiments.
A photovoltaic inverter high-voltage test system and a test method are disclosed, wherein the test system comprises:
a photovoltaic inverter high-voltage testing method comprises the following steps:
s1: and starting the high-voltage test system of the photovoltaic inverter to supply power to the industrial personal computer, the PLC, the data acquisition card and the power analyzer.
S2: self-checking of a power supply loop: the communication state of the industrial personal computer, the PLC, all the connecting equipment and the switch feedback state are ensured to be self-checked normally.
S3: main loop power supply: and the switch cabinet, the voltage regulator, the rectification power supply input and output cabinet, the rectification power supply, the grid-connected transformer input and output cabinet and the grid-connected transformer are sequentially connected.
S4: the voltage regulator boosts the voltage: and regulating the output of the voltage regulator by regulating the boosting contactor, judging whether the input voltage of the photovoltaic inverter is matched with the test required voltage, and stopping and stabilizing the voltage after the requirement is met.
S5: and judging whether the inverter detection and setting is passed or not.
And S5.1, if the inverter fails to be detected and set, reducing the voltage to a lower limit value, generating a test report, and troubleshooting the photovoltaic inverter.
And S5.2, if the inverter passes the detection and setting, starting the photovoltaic inverter and entering a configured automatic test program.
S6: and judging the obtained test waveform and the test result according to an automatic test program.
S6.1, if the test waveform and the test result meet the test parameter requirements in the automatic test program, the test is passed, the photovoltaic inverter is powered off, the voltage is reduced to a lower limit value, and a test report is generated.
S6.2, if the test waveform and the test result do not meet the requirement of the test parameters in the automatic test program, the test is not passed, the photovoltaic inverter is powered off, the voltage is reduced to a lower limit value, a test report is generated, and the photovoltaic inverter is cleared.
And testing the photovoltaic inverter in the photovoltaic inverter testing system according to the steps, wherein multistage logic protection is set in the industrial personal computer during testing, hardware protection is in the highest priority, and when manual software protection fails or the industrial personal computer is halted, the power supply can be directly and emergently disconnected through the emergency stop switch. The second level is manual software protection, and when the protection logic of the automatic test system fails, a system test manual interface is opened to realize independent control on the contactor or the breaker. And the third level is software automatic protection, a protection logic is set in an automatic test system through LabVIEW programming, and the automatic test system runs in the background in real time to realize an automatic protection function. A logical priority protection block diagram is shown in fig. 3.
When the automatic test is started in the step 5.2, the automatic test also sets three levels of authority, as shown in fig. 4, namely, an operator, a technician and a designer, the designer has the highest authority, and can perform bottom-layer development and maintenance of the program. The technician mainly carries out secondary development, configures test parameters according to the requirements of the debugging outline and maintains the test program when the debugging outline is changed. The operator has the lowest authority, only simple program application is carried out, and the bottom layer program cannot be accessed and modified.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention.
Claims (7)
1. A photovoltaic inverter high pressure test system which characterized in that: the system comprises a switch cabinet, a voltage regulator, a rectification power supply input and output cabinet, a rectification power supply, a photovoltaic inverter, a grid-connected transformer input and output cabinet, a grid-connected transformer and an industrial personal computer; the method is characterized in that: the current passes through the switch cabinet, the voltage regulator, the rectification power supply input and output cabinet, the rectification power supply and the rectification power supply input and output cabinet, and an adjustable direct current voltage is output through the devices; then flows through a photovoltaic inverter, a grid-connected transformer input/output cabinet, a grid-connected transformer and a grid-connected transformer input/output cabinet; outputting three-phase alternating-current voltage through the tested photovoltaic converter, boosting the voltage through a transformer and feeding the voltage back to a 10kV power grid; the switch cabinet, the voltage regulator, the rectifying power supply input and output cabinet, the rectifying power supply, the photovoltaic inverter, the grid-connected transformer input and output cabinet and the grid-connected transformer are respectively connected with the industrial personal computer, test data of each device are displayed through the industrial personal computer, if the data exceed a set value, the industrial personal computer sends out a signal, and a worker manually controls to reduce the data value.
2. The system for testing the high voltage of the photovoltaic inverter as claimed in claim 1, wherein the switch cabinet, the voltage regulator, the rectified power input and output cabinet and the rectified power form a power supply part.
3. The system for testing the high voltage of the photovoltaic inverter as claimed in claim 1, wherein the photovoltaic inverter, the input and output cabinet of the grid-connected transformer and the grid-connected transformer form an output part.
4. A high-voltage testing method for a photovoltaic inverter is characterized by comprising the following steps: the method comprises the following steps:
s1: and starting the high-voltage test system of the photovoltaic inverter to supply power to the industrial personal computer, the PLC, the data acquisition card and the power analyzer.
S2: self-checking of a power supply loop: the communication state of the industrial personal computer, the PLC, all the connecting equipment and the switch feedback state are ensured to be self-checked normally.
S3: main loop power supply: and the switch cabinet, the voltage regulator, the rectification power supply input and output cabinet, the rectification power supply, the grid-connected transformer input and output cabinet and the grid-connected transformer are sequentially connected.
S4: the voltage regulator boosts the voltage: and regulating the output of the voltage regulator by regulating the boosting contactor, judging whether the input voltage of the photovoltaic inverter is matched with the test required voltage, and stopping and stabilizing the voltage after the requirement is met.
S5: and judging whether the inverter detection and setting is passed or not.
And S5.1, if the inverter fails to be detected and set, reducing the voltage to a lower limit value, generating a test report, and troubleshooting the photovoltaic inverter.
And S5.2, if the inverter passes the detection and setting, starting the photovoltaic inverter and entering a configured automatic test program.
S6: and judging the obtained test waveform and the test result according to an automatic test program.
S6.1, if the test waveform and the test result meet the test parameter requirements in the automatic test program, the test is passed, the photovoltaic inverter is powered off, the voltage is reduced to a lower limit value, and a test report is generated.
S6.2, if the test waveform and the test result do not meet the requirement of the test parameters in the automatic test program, the test is not passed, the photovoltaic inverter is powered off, the voltage is reduced to a lower limit value, a test report is generated, and the photovoltaic inverter is cleared.
5. The method according to claim 4, wherein in step S1, the data acquisition card is PCI-6254, and the data from the PV inverter is acquired.
6. The method for testing the high voltage of the photovoltaic inverter as claimed in claim 4, wherein the photovoltaic inverter adopts a modbus communication protocol.
7. The high-voltage testing method of the photovoltaic inverter according to claim 4, characterized in that multistage logic protection is adopted in an industrial personal computer: the first stage is hardware protection; the second level is manual software protection; and the third level is software automatic protection.
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| CN201911276317.7A CN110824288A (en) | 2019-12-12 | 2019-12-12 | High-voltage test system and test method for photovoltaic inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327812A (en) * | 2020-11-18 | 2021-02-05 | 杭州电力设备制造有限公司 | Multi-mode factory inspection method for intelligent monitor of switch cabinet |
| CN115825633A (en) * | 2023-02-14 | 2023-03-21 | 深圳市首航新能源股份有限公司 | Assessment method and device of photovoltaic inverter complete machine test system and upper computer |
-
2019
- 2019-12-12 CN CN201911276317.7A patent/CN110824288A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327812A (en) * | 2020-11-18 | 2021-02-05 | 杭州电力设备制造有限公司 | Multi-mode factory inspection method for intelligent monitor of switch cabinet |
| CN115825633A (en) * | 2023-02-14 | 2023-03-21 | 深圳市首航新能源股份有限公司 | Assessment method and device of photovoltaic inverter complete machine test system and upper computer |
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