Chain type SVG control system and testing method and system thereof

Abstract

The invention relates to a chained SVG (static var generator) control system and a testing method and system thereof, and belongs to the technical field of static var generator testing. The method comprises the following steps: after a chained SVG control system is powered on, charging a capacitor in a to-be-tested power module, judging whether the to-be-tested power module correctly feeds back sampling voltage of the to-be-tested power module to an upper computer in the chained SVG control system or not, and testing an uplink communication link of the to-be-tested power module; if the uplink communication link of the to-be-tested power module is normal, an upper computer in the chained SVG control system issues a first carrier initial value to the to-be-tested power module, issues a second carrier initial value to other power modules except the to-be-tested power module, and detects the port output voltage of the to-be-tested power module; and judging whether the output voltage of the port of the power module to be tested is consistent with the output voltage corresponding to the preset first carrier initial value, and completing the downlink communication link test. According to the invention, a fault occurrence position can be accurately positioned and an optical fiber plugging position error fault can be detected.

Description

Technical Field

[0001] The invention belongs to the technical field of static reactive power generating equipment testing, and in particular relates to a chain-type SVG control system and a testing method and system thereof. Background Art

[0002] Chain SVG (static var generator) can improve the power quality of the power grid by adjusting the reactive power output, and has become one of the important components of new energy power stations. Chain SVG usually includes an SVG controller and multiple SVG power modules. The SVG controller includes a host computer and a main control chassis. The main control chassis includes a main control board and an interface board. The host computer is connected to the main control board of the main control chassis. The SVG power module includes a power module control board and electronic components such as power switch devices, capacitors, etc. Figure 1 The interface board in the main control chassis is connected to each SVG power module control board through optical fiber.

[0003] Before the chain SVG is put into operation or when a fault occurs, it is usually necessary to conduct tests such as communication link and open-loop wave transmission to detect whether it has a fault or locate the fault location. Among them, for the communication link test, the common test method in the prior art is to plug and unplug the uplink and downlink optical fibers between the SVG controller and each SVG power module control board and illuminate them to verify whether the uplink and downlink optical fiber communications are normal and whether the plug-in position is correct. However, this test method is inefficient, and plugging and unplugging the optical fiber is also likely to cause damage to the optical fiber interface.

[0004] The Chinese invention patent application with publication number CN106597142A discloses an automatic testing device for SVG power modules, which involves a communication testing method: the monitoring background sends a communication test instruction, and after the main control unit receives the instruction, it sends a communication message to the control board of the power module under test. If the power module feeds back the corresponding communication message to the main control unit, it is determined that the communication test is qualified, otherwise the communication test is unqualified. This testing method sends communication messages to all power module control boards at the same time. When the plug-in position of the optical fiber between the two power module control boards and the SVG control system is reversed, it will be difficult to identify it, and it is difficult to distinguish whether it is an uplink communication link failure or a downlink link failure. Therefore, although this method avoids the problems of low efficiency and damage to the optical fiber interface caused by plugging and unplugging the optical fiber, it is difficult to accurately locate the fault location and difficult to detect the optical fiber plug-in position error fault. Summary of the invention

[0005] The object of the present invention is to provide a chain SVG control system and a test method and system thereof, so as to solve the problem that the existing test method is difficult to accurately locate the fault location and difficult to detect the optical fiber plug-in position error fault.

[0006] The present invention provides a method for testing a chain SVG control system to solve the above technical problems, comprising the following steps: 1) After the chain SVG control system is powered on, the capacitor in the power module to be tested is charged. If the power module to be tested correctly feeds back the sampled voltage of the power module to the host computer in the chain SVG control system, the uplink communication link of the power module to be tested is normal, otherwise it is abnormal; 2) If the uplink communication link of the power module to be tested is normal, the host computer in the chain SVG control system sends the first carrier initial value to the power module to be tested, sends the second carrier initial value to other power modules outside the power module to be tested, and detects the output voltage of the port of the power module to be tested. If the output voltage of the port of the power module to be tested is the preset output voltage corresponding to the first carrier initial value, the downlink communication link of the power module to be tested is normal, otherwise it is abnormal, and the first carrier initial value is different from the second carrier initial value.

[0007] The beneficial effect of the testing method of the present invention is that when the present invention utilizes the chain SVG for charging, the control board of each power module can collect the power module capacitor voltage and feed it back to the property of the control system host computer. When the chain SVG is charged, by checking whether the power module to be tested correctly feeds back the sampled voltage of the power module to be tested to the host computer in the chain SVG control system, it is judged whether the uplink communication link of the power module to be tested is normal. Since the present invention utilizes the function of the SVG control system itself to detect whether the uplink communication link is normal, it can save costs and improve the test efficiency. When judging whether the downlink communication link is normal, on the one hand, it is carried out under the condition that the uplink communication link is normal, so that it can accurately judge whether the downlink communication link is normal; on the other hand, by sending a carrier initial value different from other power modules to the power module to be tested, by detecting whether the output voltage of the port of the power module to be tested is the expected output voltage, it is judged whether the downlink communication link of the power module to be tested is normal. Since the sent carrier initial value is different from that of other power modules, it is possible to detect the fault of the downlink communication links of the two power modules being connected in reverse. In addition, when testing whether the downlink communication link is normal, the open-loop wave test of the power to be tested is also completed. Therefore, the test method completes the communication link test and the module open-loop wave test at one time, and the test efficiency is high.

[0008] The chain SVG control system provided by the present invention to solve the above technical problems includes a host computer, a main control board, an interface board and a power module control board, wherein the host computer is connected to the main control board, the main control board is connected to the interface board, and the interface board is connected to the power module control board. The system includes a test mode and a grid-connected operation mode. The host computer is used to realize mode switching. The system realizes the following functions in the test mode: after the chain SVG control system is powered on, when charging the capacitor in the power module to be tested, the power module to be tested sends a sampling voltage to the host computer; when the uplink communication link of the power module to be tested is normal, the host computer sends a first carrier initial value to the power module to be tested through a control chassis, and sends a second carrier initial value to other power modules outside the power module to be tested, and the first carrier initial value is different from the second carrier initial value.

[0009] The beneficial effects of the chained SVG control system of the present invention are as follows: the chained SVG control system of the present invention is provided with a test mode and a grid-connected operation mode. When testing is required, it is only necessary to switch to the test mode through the host computer, without having to change the parameters of each unit in the chained SVG control system and the hardware connection of each unit on site, thereby greatly improving the test efficiency; after the test is completed, it is switched to the grid-connected operation mode, and the SVG device can be normally grid-connected and put into operation. The chained SVG control system can effectively reduce the workload of the commissioning personnel for on-site testing, shorten the test time of the system performance, improve the reliability of the SVG device before grid-connected operation, and improve the intelligence of the device.

[0010] The present invention provides a test system for a chain SVG control system to solve the above technical problems, comprising a test power supply, a voltage detection device and a chain SVG control system; the test power supply is used to be connected to a voltage input end of a power module to be tested; the voltage detection device is used to be connected to a voltage output end of the power module to be tested; the chain SVG control system comprises a host computer, a main control chassis and a power module control board connected in sequence, the chain SVG control system comprises a test mode and a grid-connected operation mode, the host computer is used to realize mode switching, and the chain SVG control system realizes the following functions in the test mode: after the chain SVG control system is powered on, when charging a capacitor in the power module to be tested, the power module to be tested sends a sampled voltage to the host computer; when the uplink communication link of the power module to be tested is normal, the host computer sends a first carrier initial value to the power module to be tested through the control chassis, and sends a second carrier initial value to other power modules other than the power module to be tested, and the first carrier initial value is different from the second carrier initial value.

[0011] Furthermore, the test power supply is an AC power supply, which is used to connect to the AC input terminal of the power module to be tested, and the voltage detection device is used to connect to the DC output terminal of the power module to be tested.

[0012] Furthermore, the voltage detection device is an oscilloscope.

[0013] The beneficial effect of the test system of the present invention is that when the chain SVG is used for charging, the control board of each power module can collect the power module capacitor voltage and feed it back to the property of the control system host computer. When the chain SVG is charged, by checking whether the power module to be tested correctly feeds back the sampled voltage of the power module to be tested to the host computer in the chain SVG control system, it is judged whether the uplink communication link of the power module to be tested is normal. Since the present application utilizes the function of the SVG control system itself to detect whether the uplink communication link is normal, it can save costs and improve test efficiency. When judging whether the downlink communication link is normal, on the one hand, it is carried out when the uplink communication link is normal, so that it can accurately judge whether the downlink communication link is normal; on the other hand, by sending a carrier initial value different from other power modules to the power module to be tested, by detecting whether the output voltage of the port of the power module to be tested is the expected output voltage, it is judged whether the downlink communication link of the power module to be tested is normal. Since the sent carrier initial value is different from that of other power modules, it is possible to detect the fault of the downlink communication link of the two power modules being connected in reverse. In addition, when testing whether the downlink communication link is normal, the open-loop wave test of the power to be tested is also completed. Therefore, the test system completes the communication link test and the module open-loop wave test at one time, and the test efficiency is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the block diagram of the existing chain SVG main circuit system; Figure 2 is a flow chart of a chained SVG control system testing method according to an embodiment of the present invention; Figure 3 is a schematic diagram of a chained SVG control system test according to an embodiment of the present invention; Figure 4 is a structural block diagram of the test system of an embodiment of the present invention; In the figure, QF-A is the A-phase switch, QF-B is the B-phase switch, QF-C is the C-phase switch, Tx is the transmitting interface, and Rx is the receiving interface. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] The basic idea of ​​the present invention is to first use the original function of the chain SVG control system to test the uplink communication link of the power module to be tested, and then send different carrier signals to the power module to be tested and other power modules to test whether the downlink communication link of the power module to be tested is faulty or whether the optical fiber plug-in position is correct. This arrangement can accurately locate whether the fault occurs in the downlink communication link or the uplink communication link; and can detect whether the optical fiber plug-in position is normal.

[0017] Example of testing method for chain SVG control system Based on the above basic idea, the testing method of the present invention comprises the following steps: 1) After the chain SVG control system is powered on, the capacitor in the power module to be tested is charged. If the power module to be tested correctly feeds back the sampled voltage of the power module to the host computer in the chain SVG control system, the uplink communication link of the power module to be tested is normal, otherwise it is abnormal; 2) If the uplink communication link of the power module to be tested is normal, the host computer in the chain SVG control system sends the first carrier initial value to the power module to be tested, sends the second carrier initial value to other power modules outside the power module to be tested, and detects the output voltage of the port of the power module to be tested. If the output voltage of the port of the power module to be tested is the preset output voltage corresponding to the first carrier initial value, the downlink communication link of the power module to be tested is normal, otherwise it is abnormal, and the first carrier initial value is different from the second carrier initial value.

[0018] like Figure 2 As shown in the figure, when the host computer of the chain SVG control system selects the test mode, it first determines whether the uplink communication link is normal. Specifically, after the chain SVG control system is powered on, the power module to be tested (such as Figure 3 The capacitor in the power module 1) is charged, and the voltage of the power module to be tested is checked at the host computer to see if it is correct. If it is correct, the uplink communication link is normal. If it is not correct, the uplink communication link is abnormal. If the uplink communication link is abnormal, no downlink communication link test, open-loop wave test and other test contents are performed. If the uplink communication link is normal, the downlink communication link test is performed: the first carrier initial value is sent to the power module to be tested (such as the first carrier initial value is 0x"0000"), and the second carrier initial value is sent to other power modules to be tested outside the power module to be tested (such as the second carrier initial value is set to 0x"FFFF"), and the output voltage of the port of the power module to be tested is detected. If the output voltage of the port of the power module to be tested is the preset output voltage corresponding to the first carrier initial value, the downlink communication link is normal, otherwise it is abnormal.

[0019] Among them, the first carrier initial value and the second carrier initial value are not limited to 0x"0000" and 0x"FFFF", and can be set according to actual conditions, as long as the two values ​​are different. The reason why the carrier signals of the power module to be tested and other power modules are set differently is that if they are the same, the port output voltages of the power module to be tested and other power modules are also the same. Then, it will not be possible to reflect the situation that the optical fiber between the power module to be tested and the SVG controller and the optical fiber between other power modules and the SVG controller are connected in reverse. If the settings are different, the port output voltages of the power module to be tested and other power modules must be different. If the reverse connection occurs, the port output voltage of the power module to be tested will be different from the expected output voltage (the preset output voltage corresponding to the first carrier initial value).

[0020] The judgment of whether the uplink communication link is normal can be determined by observation by a tester, or a program can be configured in the host computer to automatically determine the condition.

[0021] The above test method utilizes the function of the SVG control system itself to detect whether the uplink communication link is normal, which can save costs and improve test efficiency. When testing the downlink communication link, it is carried out when the uplink communication link is normal, so that it can accurately determine whether the downlink communication link is normal; and because the initial value of the carrier sent to the power module to be tested is different from that of other power modules, it is possible to detect the fault that the optical fiber communication link of the power module to be tested is connected in reverse with other power modules. In addition, when testing whether the downlink communication link is normal, the open-loop wave test of the power module to be tested is also completed. Therefore, the test method completes the communication link test and the module open-loop wave test at one time, and the test efficiency is high.

[0022] Chain SVG control system implementation example Based on the above basic idea, the chain SVG control system of the present invention includes a host computer, a main control board, an interface board and a power module control board. The host computer is connected to the main control board, the main control board is connected to the interface board, and the interface board is connected to the power module control board. Figure 4 As shown. The chain SVG control system includes a test mode and a grid-connected operation mode, and the host computer is used to realize the switching between the test mode and the grid-connected operation mode, wherein the system realizes the following functions in the test mode: after the chain SVG control system is powered on, when the capacitor in the power module to be tested is charged, the power module to be tested sends a sampled voltage to the host computer; when the uplink communication link of the power module to be tested is normal, the host computer sends the first carrier initial value to the power module to be tested through the control chassis, and sends the second carrier initial value to other power modules outside the power module to be tested, and the first carrier initial value is different from the second carrier initial value. Among them, the grid-connected operation mode is the working mode when the chain SVG control system is put into operation normally, at this time, the host computer sends the triangular carrier required for normal grid connection to each power module.

[0023] Among them, after the power module to be tested sends a sampled voltage to the host computer, the sampled voltage is used to determine whether the uplink communication link is normal. If the sampled voltage is correct, the uplink communication link is normal, otherwise it is abnormal; the judgment of whether the uplink communication link is normal can be determined by observation by the tester, or it can be automatically determined by configuring a program in the host computer. After the host computer sends the first carrier initial value to the power module to be tested through the control chassis and sends the second carrier initial value to other power modules outside the power module to be tested, it can determine whether the downlink communication link of the power module to be tested is normal based on the output voltage of the port of the power module to be tested.

[0024] The interface board and the power module control board are usually connected via optical fiber. Figure 3As shown, the main control chassis and the power module control board are connected through two optical fibers, one is an uplink communication link, which is used for each power module to send operation information to the main control chassis and the host computer; the other is a downlink communication link, which is used for the host computer and the main control chassis to send control instructions and other information to each power module.

[0025] The chained SVG control system of the present invention is provided with a test mode and a grid-connected operation mode, that is, each unit of the control system is pre-configured with a test function. When testing is required, it is only necessary to start the test mode through the host computer, without having to modify the parameters of each unit in the chained SVG control system and the hardware connection of each unit on site, thereby greatly improving the test efficiency; after the test is completed, it is switched to the grid-connected operation mode, and the SVG device can be normally grid-connected and put into operation. The chained SVG control system can effectively reduce the workload of on-site testing of commissioning personnel, shorten the test time of system performance, improve the reliability of SVG equipment before grid-connected operation, and improve the intelligence of the equipment.

[0026] Example of a test system for a chained SVG control system Based on the above basic ideas, Figure 4 As shown, the test system of the present invention includes a test power supply, a voltage detection device and a chain SVG control system; the test power supply is used to connect to the voltage input end of the power module to be tested; the voltage detection device is used to connect to the voltage output end of the power module to be tested, and is used to detect the output voltage of the port of the power module to be tested. The chain SVG control system includes a host computer, a main control board, an interface board and a power module control board, the host computer is connected to the main control board, the main control board is connected to the interface board, and the interface board is connected to the power module control board. The chain SVG control system includes a test mode and a grid-connected operation mode, the host computer is used to realize the switching between the test mode and the grid-connected operation mode, and the chain SVG control system realizes the following functions in the test mode: after the chain SVG control system is powered on, when charging the capacitor in the power module to be tested, the power module to be tested sends a sampled voltage to the host computer; when the uplink communication link of the power module to be tested is normal, the host computer sends a first carrier initial value to the power module to be tested through the control chassis, and sends a second carrier initial value to other power modules outside the power module to be tested, and the first carrier initial value is different from the second carrier initial value. The grid-connected operation mode is the working mode when the chain SVG control system is put into operation normally. At this time, the host computer sends the triangular carrier required for normal grid connection to each power module.

[0027] Among them, after the power module to be tested sends a sampled voltage to the host computer, the sampled voltage is used to determine whether the uplink communication link is normal. If the sampled voltage is correct, the uplink communication link is normal, otherwise it is abnormal; the judgment of whether the uplink communication link is normal can be determined by observation by the tester, or it can be automatically determined by configuring a program in the host computer. After the host computer sends the first carrier initial value to the power module to be tested through the control chassis and sends the second carrier initial value to other power modules outside the power module to be tested, it can determine whether the downlink communication link of the power module to be tested is normal based on the output voltage of the port of the power module to be tested obtained by the voltage detection device.

[0028] The interface board and the power module control board are usually connected via optical fiber. Figure 3 As shown, the main control chassis and the power module control board are connected through two optical fibers, one is an uplink communication link, which is used for each power module to send operation information to the main control chassis and the host computer; the other is a downlink communication link, which is used for the host computer and the main control chassis to send control instructions and other information to each power module.

[0029] Preferably, the test power supply of this embodiment is an AC power supply, the output terminal of the AC power supply is connected to the AC input terminal of the power module to be tested, and the voltage detection device is connected to the DC output terminal of the power module to be tested.

[0030] Preferably, the voltage detection device of this embodiment is an oscilloscope. If an oscilloscope is used, the tester can directly observe the output voltage of the port of the power module to be tested, thereby judging whether the communication link test or the open-loop wave test has passed. Of course, other implementation methods may also be devices such as voltage transformers. When the voltage detection device does not have a display, the voltage detection device may also be connected to a host computer to feed back voltage information to the host computer, which is displayed by the host computer, or the host computer may complete the test verification of each functional unit of the power module, each functional unit of the controller, and the upstream and downstream optical fiber connections between primary and secondary devices. However, this test method also needs to be connected to the host computer, which increases the test workload compared to the test method using an oscilloscope.

[0031] The present invention has the following characteristics: 1) By selecting the control mode on the host computer, the testing requirements of various performance indicators of the equipment on the project site can be well met without changing the equipment engineering program, parameter settings and hardware connections of the chain SVG control system; 2) The test mode of the test system can effectively verify the correctness of the upstream and downstream optical fiber connections between the power module and the controller, as well as the primary and secondary devices; 3) After the test is completed, select the grid-connected operation mode, and the SVG equipment can be normally connected to the grid and put into operation, which can effectively reduce the workload of the commissioning personnel on-site testing, shorten the test time of system performance, improve the reliability of the SVG equipment before grid connection and operation, and improve the intelligence of the equipment; 4) Compared with general testing strategies, this method is simple, has clear logic, small amount of calculation, and is easy to implement.

Claims

1. A method for testing a chain SVG control system, characterized in that: The test method includes the following steps: 1) After the chain SVG control system is powered on, the capacitor in the power module to be tested is charged. If the power module to be tested correctly feeds back the sampled voltage of the power module to the host computer in the chain SVG control system, the uplink communication link of the power module to be tested is normal, otherwise it is abnormal; 2) If the uplink communication link of the power module to be tested is normal, the host computer in the chain SVG control system sends the first carrier initial value to the power module to be tested, sends the second carrier initial value to other power modules outside the power module to be tested, and detects the output voltage of the port of the power module to be tested. If the output voltage of the port of the power module to be tested is the preset output voltage corresponding to the first carrier initial value, the downlink communication link of the power module to be tested is normal, otherwise it is abnormal, and the first carrier initial value is different from the second carrier initial value.

2. A chain SVG control system, comprising a host computer, a main control chassis and a power module control board, wherein the host computer is connected to the main control chassis, and the main control chassis is connected to the power module control board, characterized in that: The system includes a test mode and a grid-connected operation mode. The host computer is used to realize mode switching. The system realizes the following functions in the test mode: after the chain SVG control system is powered on, when the capacitor in the power module to be tested is charged, the power module to be tested sends a sampled voltage to the host computer; when the uplink communication link of the power module to be tested is normal, the host computer sends a first carrier initial value to the power module to be tested through a control box, and sends a second carrier initial value to other power modules outside the power module to be tested, and the first carrier initial value is different from the second carrier initial value.

3. A test system for a chain SVG control system, characterized in that: The test system includes a test power supply, a voltage detection device and a chain SVG control system; the test power supply is used to connect to the voltage input end of the power module to be tested; the voltage detection device is used to connect to the voltage output end of the power module to be tested; the chain SVG control system includes a host computer, a main control chassis and a power module control board connected in sequence, the chain SVG control system includes a test mode and a grid-connected operation mode, the host computer is used to realize mode switching, and the chain SVG control system realizes the following functions in the test mode: after the chain SVG control system is powered on, when charging the capacitor in the power module to be tested, the power module to be tested sends a sampled voltage to the host computer; when the uplink communication link of the power module to be tested is normal, the host computer sends a first carrier initial value to the power module to be tested through the control chassis, and sends a second carrier initial value to other power modules outside the power module to be tested, and the first carrier initial value is different from the second carrier initial value.

4. The test system of the chain SVG control system according to claim 3, characterized in that: The test power supply is an AC power supply, which is used to connect to the AC input terminal of the power module to be tested, and the voltage detection device is used to connect to the DC output terminal of the power module to be tested.

5. The test system of the chain SVG control system according to claim 3, characterized in that: The voltage detection device is an oscilloscope.

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