CN113848413A - Flexible direct current converter valve power module test system - Google Patents
Flexible direct current converter valve power module test system Download PDFInfo
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Abstract
The invention discloses a flexible direct current converter valve power module test system, which comprises a controller, a data acquisition terminal, a power supply system, a loop voltage drop detection circuit, an RC detection circuit, a double-pulse test circuit, an upper computer and the like, integrates a plurality of test functions of basic function test, capacitance detection, voltage-sharing resistance detection, board card fault location, power device dynamic parameter test and the like of the flexible direct current converter valve power module, can intelligently and efficiently complete the test, provides a portable test method and a tool for converter valve field handover and laboratory test, fills the blank of field handover link test, solves the problem of field handover evaluation of the converter valve, improves the operation reliability of the converter valve, and provides technical support for the field test and operation maintenance of flexible direct current engineering.
Description
Technical Field
The invention relates to the technical field of flexible direct current power transmission, in particular to a flexible direct current converter valve power module test system.
Background
Compared with the traditional high-voltage direct-current transmission technology (LCC), the flexible direct-current transmission based on the Modular Multilevel Converter (MMC) can independently control active power and reactive power, is more flexible to control, and is widely applied to the fields of new-generation direct-current transmission technology, new energy grid connection, renewable energy remote transmission, flexible power grid partition interconnection and the like.
The converter valve comprises a large number of power modules, each power module can be regarded as a power electronic device half-bridge power module comprising multiple elements such as an IGBT (insulated gate bipolar transistor), a capacitor, an energy-taking power supply, a voltage measurement, a bypass switch, a control board and the like, the power electronic device half-bridge power module mainly comprises two switching devices-diode pairs (or having the same function), a direct current capacitor and a voltage-sharing resistor, and the full-bridge power module mainly comprises four switching devices-diode pairs (or having the same function), a direct current capacitor and a voltage-sharing resistor. The full development of tests in each link is an important means for reducing the failure rate in operation, particularly the power module test in an engineering field, the power supply and the field for testing a valve hall in the engineering field are limited, a converter valve power module is installed on a valve tower, the conventional power module test platform does not have high-altitude operation conditions and is not suitable for the engineering field test, and the current link test is blank and has no systematic method and tool available. The power module test system for the flexible direct current converter valve, provided by the invention, provides a portable test tool for field handover and laboratory test of the flexible direct current converter valve, fills the blank of field handover link test, solves the field handover evaluation problem of the converter valve, improves the operation reliability of the converter valve, and provides technical support for field test and operation maintenance of flexible direct current engineering.
Disclosure of Invention
The embodiment of the invention provides a flexible direct current converter valve power module testing system, which is used for solving the technical problems that an effective engineering field testing platform is lacked in the existing engineering field flexible direct current converter valve power module testing, the flexible direct current converter valve power module is difficult to test in the engineering field, and the field switching and evaluating of a converter valve are difficult.
In view of the above, the invention provides a flexible direct current converter valve power module test system, which comprises a controller, a data acquisition terminal, a power supply system, a loop voltage drop detection circuit, an RC detection circuit, a double-pulse test circuit and an upper computer;
the power supply system is connected with the tested flexible direct current converter valve power module, the controller, the data acquisition terminal, the RC detection circuit and the double-pulse test circuit;
the data acquisition terminal is connected with the loop voltage drop detection circuit, the RC detection circuit, the double-pulse test circuit, the current sensor and the voltage sensor;
the controller is used for acquiring working state data of the tested flexible direct current converter valve power module, sending a control instruction to the tested flexible direct current converter valve power module IGBT and carrying out data analysis according to the acquired data sent by the data acquisition terminal;
the data acquisition terminal is used for acquiring acquisition data of the loop voltage drop detection circuit, the RC detection circuit, the double-pulse test circuit, the current sensor and the voltage sensor and transmitting the acquisition data to the controller;
the upper computer is used for receiving the data sent by the controller and storing and analyzing the data through data processing software;
the double-pulse test circuit is used for testing the IGBT dynamic and static parameters of the tested flexible direct current converter valve power module, acquiring the parameters and sending the parameters to the controller through the data acquisition terminal;
the RC detection circuit is used for charging and discharging a direct current capacitor of the tested flexible direct current converter valve power module, and estimating a capacitance value of the direct current capacitor and a resistance value of the voltage-sharing resistor, so that the controller sends an abnormal alarm when detecting that the capacitance value of the direct current capacitor or the resistance value of the voltage-sharing resistor is abnormal;
and the loop voltage drop detection circuit is used for detecting the loop voltage drop of the tested flexible direct current converter valve power module.
Optionally, charging and discharging a dc capacitor of the measured flexible dc converter valve power module, and estimating a capacitance value of the dc capacitor, so that when the controller detects that the capacitance value of the dc capacitor is abnormal, sending an abnormal alarm includes:
the controller collects the direct current capacitor voltage of the tested flexible direct current converter valve power module through the data collection terminal, judges whether the direct current capacitor voltage is 0, if yes, sends a low-voltage charging instruction to the RC detection circuit, controls the RC detection circuit to output the voltage to charge the tested flexible direct current power module, otherwise, controls the relay of the high-voltage discharging module of the power supply system to pull in, sends the low-voltage charging instruction to the RC detection circuit until the direct current capacitor discharges to 0V, and controls the RC detection circuit to output the voltage to charge the tested flexible direct current converter valve power module;
the controller monitors the 10V output voltage and the direct current capacitor voltage of the tested flexible direct current converter valve power module in real time through the data acquisition terminal, and fits a charging curve of the direct current capacitor voltage;
calculating the charging current of a charging resistor of the tested flexible direct current converter valve power module according to the fitted charging curve of the direct current capacitor voltage, and solving the equivalent resistance of a charging loop;
calculating the capacitance value of a direct current capacitor of the tested flexible direct current converter valve power module according to a charging curve of the voltage of the direct current capacitor and the equivalent resistance of a charging loop;
and comparing the calculated capacitance value of the direct current capacitor of the tested flexible direct current converter valve power module with a preset capacitance value, and if the difference value exceeds the limit value of the capacitance value, sending out an abnormal capacitance alarm.
Optionally, charging and discharging a dc capacitor of the tested flexible dc converter valve power module, and estimating a resistance value of the voltage-sharing resistor, so that when the controller detects that the resistance value of the voltage-sharing resistor is abnormal, sending an abnormal alarm includes:
after the capacitance value of the direct current capacitor of the tested flexible direct current converter valve power module is calculated, the controller sends a low-voltage discharge instruction to the RC detection circuit, controls the RC detection circuit to close low-voltage output, and discharges the tested flexible direct current converter valve power module;
acquiring the voltage change of a direct current capacitor in the discharging process of the tested flexible direct current power module through a data acquisition device, and calculating the resistance value of a voltage-sharing resistor connected with the direct current capacitor in parallel by using a capacitor discharging formula;
and comparing the calculated voltage-sharing resistance value of the tested flexible direct current converter valve power module with a preset resistance value, and if the difference value exceeds a resistance limit value, sending a resistance abnormity alarm.
Optionally, the controller is further configured to:
simulating valve control to issue a configuration command, and performing parameter configuration on the power module of the tested flexible direct current converter valve;
and the analog valve control issues a reset command to enable the tested flexible direct current converter valve power module to complete the reset of the latching fault signal.
Optionally, the controller is further configured to:
and continuously boosting the capacitor of the tested flexible direct current converter valve power module in a constant current source mode, testing the voltage rising slope in the boosting process, comparing the voltage rising slope with the factory capacitor charging voltage rising slope, and judging whether the charging loop of the tested flexible direct current converter valve power module is normal or not.
Optionally, the controller is further configured to:
and detecting the direct current port voltages at two ends of the direct current side collected by the tested flexible direct current converter valve power module, comparing the direct current port voltages with the direct current port voltages sent by the data collection terminal, and judging whether the voltage sampling function of the tested flexible direct current converter valve power module is normal or not.
Optionally, the controller is further configured to:
when the IGBT of the tested flexible direct current converter valve power module is locked, testing the alternating current port voltage and the direct current port voltage of the tested flexible direct current converter valve power module, and judging whether the partial pressure of the IGBT in a locked state is normal or not.
Optionally, the controller is further configured to:
and issuing a bypass command to the tested power module of the flexible direct current converter valve, closing a bypass switch, and detecting whether the bypass command triggers a secondary circuit, the bypass switch stores energy and a bypass switch body is normal.
Optionally, the controller is further configured to:
and acquiring a discharge time curve of the tested flexible direct current converter valve power module during natural discharge, comparing the discharge time curve with the RC discharge curve, and judging whether a discharge loop formed by the direct current capacitor and the voltage-sharing resistor is normal or not.
Optionally, the controller is further configured to:
and acquiring the voltage of an output port of the tested power module of the flexible direct current converter valve, comparing the voltage with the trigger pulse sequence, and judging whether the voltage of the output port is matched with the trigger pulse sequence.
Optionally, the controller is further configured to perform board card state detection on the power module of the tested flexible dc converter valve, and specifically includes:
according to the design power consumption of each secondary board card of the tested flexible direct current converter valve power module, calculating a power consumption default value of each secondary board card through the discharge rate change in the high-voltage discharge process, and positioning the fault board card according to the comparison result of the power consumption default value and the design power consumption.
Optionally, the secondary board card includes an energy-taking power supply board, a unit control board, a drive board, a contactor trigger board and a sampling trigger board.
Optionally, the upper computer is further configured to:
and generating a health state report of the tested flexible direct current converter valve power module according to the data analysis result.
Optionally, an emergency stop module is further included;
the scram module is used for connecting a direct-current capacitor into a small resistor to form a quick discharge loop when the tested flexible direct-current converter valve power module needs to be quickly discharged.
According to the technical scheme, the embodiment of the invention has the following advantages:
the flexible direct current converter valve power module test system provided by the embodiment of the invention is composed of a controller, a data acquisition terminal, a power supply system, a loop voltage drop detection circuit, an RC detection circuit, a double-pulse test circuit and an upper mechanism, integrates the test functions of multiple links of double-pulse test, RC charge and discharge detection, direct current capacitance abnormality detection, equalizing resistance abnormality detection, loop voltage drop and the like of the flexible direct current converter valve power module, can intelligently and efficiently complete the power module test, can be used for testing the flexible direct current converter valve power module in an engineering field, completes the field handover evaluation of the converter valve, fills the blank of the field handover link test, solves the field handover evaluation problem of the converter valve, improves the operation reliability of the converter valve, and provides technical support for the field test and operation maintenance of the flexible direct current engineering.
In addition, the flexible direct current converter valve power module test system provided by the embodiment of the invention can also perform functional tests such as power module configuration, power module reset, capacitor charging loop check, voltage sampling abnormity detection, power device locking state detection, power device trigger test, bypass switch closing test, power device trigger test and the like on the tested flexible direct current converter valve power module, has high integration test performance, can be suitable for occasions such as laboratory power module test and flexible direct current engineering field converter valve handover test, debugging, overhaul or operation and maintenance, and improves the field test and operation and maintenance support capability of the flexible direct current engineering.
Drawings
Fig. 1 is a schematic structural diagram of a flexible dc converter valve power module test system provided in an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For convenience of understanding, referring to fig. 1, fig. 1 is a diagram illustrating a power module testing system of a flexible dc converter valve according to an embodiment of the present invention, where the power module testing system includes a controller, a data acquisition terminal, a power system, a circuit voltage drop detection circuit, an RC detection circuit, a double-pulse testing circuit, and an upper computer;
the power supply system is connected with the tested flexible direct current converter valve power module, the controller, the data acquisition terminal, the RC detection circuit and the double-pulse test circuit;
the data acquisition terminal is connected with the loop voltage drop detection circuit, the RC detection circuit, the double-pulse test circuit, the current sensor and the voltage sensor;
the controller is used for acquiring working state data of the tested flexible direct current converter valve power module, sending a control instruction to the tested flexible direct current converter valve power module IGBT and carrying out data analysis according to the acquired data sent by the data acquisition terminal;
the data acquisition terminal is used for acquiring acquisition data of the loop voltage drop detection circuit, the RC detection circuit, the double-pulse test circuit, the current sensor and the voltage sensor and transmitting the acquisition data to the controller;
the upper computer is used for receiving the data sent by the controller and storing and analyzing the data through data processing software. The upper computer is provided with a display interface, can perform various operations of the equipment on the interface, comprises equipment self-checking and conventional function automatic testing, and independent testing of various subfunctions and the like, can perform testing on the interface through navigation information indication, and has a simple test report display function, gives suggestions on the health state of the power module, can check historical data and the like, and meets the requirements on historical data storage and checking.
The double-pulse test circuit comprises a load test box (an electric reactor and a CT), forms a double-pulse test loop with the power module, and is used for testing dynamic and static parameters (a gate pole voltage signal, a collector emitter voltage signal-high voltage, a device saturation voltage drop signal-low voltage and a collector current signal) of the IGBT of the tested flexible direct current converter valve power module through double pulses, collecting the parameters and transmitting the parameters to the controller through a data collection terminal;
the RC detection circuit is used for charging and discharging a direct current capacitor of the tested flexible direct current converter valve power module, and estimating a capacitance value of the direct current capacitor and a resistance value of the voltage-sharing resistor, so that the controller sends an abnormal alarm when detecting that the capacitance value of the direct current capacitor or the resistance value of the voltage-sharing resistor is abnormal;
and (3) detecting the capacitance value abnormality of the direct current capacitor:
the controller collects the direct current capacitor voltage of the tested flexible direct current converter valve power module through the data collection terminal, judges whether the direct current capacitor voltage is 0, if yes, sends a low-voltage charging instruction to the RC detection circuit, controls the RC detection circuit to output the voltage to charge the tested flexible direct current power module, otherwise, controls the relay of the high-voltage discharging module of the power supply system to pull in, sends the low-voltage charging instruction to the RC detection circuit until the direct current capacitor discharges to 0V, and controls the RC detection circuit to output the voltage to charge the tested flexible direct current converter valve power module;
the controller monitors the 10V output voltage and the direct current capacitor voltage of the tested flexible direct current converter valve power module in real time through the data acquisition terminal, and fits a charging curve of the direct current capacitor voltage;
calculating the charging current of a charging resistor of the tested flexible direct current converter valve power module according to the fitted charging curve of the direct current capacitor voltage, and solving the equivalent resistance of a charging loop;
calculating the capacitance value of a direct current capacitor of the tested flexible direct current converter valve power module according to a charging curve of the voltage of the direct current capacitor and the equivalent resistance of a charging loop;
and comparing the calculated capacitance value of the direct current capacitor of the tested flexible direct current converter valve power module with a preset capacitance value, and if the difference value exceeds the limit value of the capacitance value, sending out an abnormal capacitance alarm.
Detecting the abnormality of the voltage equalizing resistor:
after the capacitance value of the direct current capacitor of the tested flexible direct current converter valve power module is calculated, the controller sends a low-voltage discharge instruction to the RC detection circuit, controls the RC detection circuit to close low-voltage output, and discharges the tested flexible direct current converter valve power module;
acquiring the voltage change of a direct current capacitor in the discharging process of the tested flexible direct current power module through a data acquisition device, and calculating the resistance value of a voltage-sharing resistor connected with the direct current capacitor in parallel by using a capacitor discharging formula;
and comparing the calculated voltage-sharing resistance value of the tested flexible direct current converter valve power module with a preset resistance value, and if the difference value exceeds a resistance limit value, sending a resistance abnormity alarm.
The loop voltage drop detection circuit is used for detecting the loop voltage drop of the tested flexible direct current converter valve power module, and as shown in fig. 1, 3 loop voltage drop detection circuits can be arranged.
The direct current capacitor voltage of the tested flexible direct current converter valve power module can be measured through a high-speed capacitor voltage sampling plate, one end of the high-speed capacitor voltage sampling plate is connected with a voltage sensor, and the other end of the high-speed capacitor voltage sampling plate is connected with a data acquisition terminal.
The controller, the data acquisition terminal, the power supply system, the loop voltage drop detection circuit, the RC detection circuit, the double-pulse test circuit and the upper computer in the embodiment of the invention can be integrated in a portable structure so as to meet the portable requirement.
The flexible direct current converter valve power module test system provided by the embodiment of the invention can carry out functional tests on the power module, and the functional test items comprise:
power module configuration: simulating valve control to issue a configuration command, and performing parameter configuration on the power module of the tested flexible direct current converter valve;
resetting the power module: and the analog valve control issues a reset command to enable the tested flexible direct current converter valve power module to complete the reset of the latching fault signal.
Checking a capacitor charging loop: and continuously boosting the capacitor of the tested flexible direct current converter valve power module in a constant current source mode, testing the voltage rising slope in the boosting process, comparing the voltage rising slope with the factory capacitor charging voltage rising slope, and judging whether the charging loop of the tested flexible direct current converter valve power module is normal or not.
And (3) voltage sampling abnormity detection: and detecting the direct current port voltages at two ends of the direct current side collected by the tested flexible direct current converter valve power module, comparing the direct current port voltages with the direct current port voltages sent by the data collection terminal, and judging whether the voltage sampling function of the tested flexible direct current converter valve power module is normal or not.
And (3) detecting the locking state of the power device: when the IGBT of the tested flexible direct current converter valve power module is locked, testing the alternating current port voltage and the direct current port voltage of the tested flexible direct current converter valve power module, comparing whether the alternating current port voltage is about half of the direct current port voltage, judging whether the partial voltage of the IGBT in a locked state is normal, and if the alternating current port voltage is about half of the direct current port voltage, judging that the partial voltage of the IGBT in a locked state is normal.
And (3) testing the closing of a bypass switch: and issuing a bypass command to the tested power module of the flexible direct current converter valve, closing a bypass switch, and detecting whether the bypass command triggers a secondary circuit, the bypass switch stores energy and a bypass switch body is normal.
And (3) power module discharge test: and acquiring a discharge time curve (1.0-0.7 pu) of the tested flexible direct current converter valve power module during natural discharge, and comparing the discharge time curve with the RC discharge curve to judge whether a discharge loop formed by the direct current capacitor and the voltage-sharing resistor is normal or not.
And (3) triggering and testing a power device: and acquiring the voltage of an output port of the tested power module of the flexible direct current converter valve, comparing the voltage with the trigger pulse sequence, and judging whether the voltage of the output port is matched with the trigger pulse sequence.
Board card state detection: and the controller is communicated with the main control board of the power module to obtain the state information of the board card in the power module, and the fault board card is alarmed in real time so as to carry out troubleshooting on the board card subsequently.
The controller is further used for detecting the board card state of the tested flexible direct current converter valve power module, specifically, calculating a power consumption default value of each secondary board card according to the design power consumption of each secondary board card of the tested flexible direct current converter valve power module and the discharge rate change of the high-voltage discharge process, and positioning the fault board card according to the comparison result of the power consumption default value and the design power consumption. The secondary board card of the tested power module of the flexible direct current converter valve comprises an energy taking power supply board, a unit control board, a drive board, a contactor trigger board and a sampling trigger board, and since the loss difference of each type of board card is large, the total loss is known, and then which type of board card fails can be known by deducing the default value of the loss.
In the system provided by the invention, an emergency stop module can be further arranged, and the emergency stop module is used for connecting a direct current capacitor into a small resistor to form a rapid discharge loop when the power module of the tested flexible direct current converter valve needs to be rapidly discharged. The scram module can be set in a mode of a scram button, the scram module is started when the scram button is pressed, the direct current capacitor and the small resistor form a loop, and energy is discharged through the resistor, so that the power module of the tested flexible direct current converter valve can discharge rapidly.
The flexible direct current converter valve power module test system provided by the embodiment of the invention is composed of a controller, a data acquisition terminal, a power supply system, a loop voltage drop detection circuit, an RC detection circuit, a double-pulse test circuit and an upper mechanism, integrates the test functions of multiple links of double-pulse test, RC charge and discharge detection, direct current capacitance abnormality detection, equalizing resistance abnormality detection, loop voltage drop and the like of the flexible direct current converter valve power module, can intelligently and efficiently complete the power module test, can be used for testing the flexible direct current converter valve power module in an engineering field, completes the field handover evaluation of the converter valve, fills the blank of the field handover link test, solves the field handover evaluation problem of the converter valve, improves the operation reliability of the converter valve, and provides technical support for the field test and operation maintenance of the flexible direct current engineering.
In addition, the flexible direct current converter valve power module test system provided by the embodiment of the invention can also perform functional tests such as power module configuration, power module reset, capacitor charging loop check, voltage sampling abnormity detection, power device locking state detection, power device trigger test, bypass switch closing test, power device trigger test and the like on the tested flexible direct current converter valve power module, has high integration test performance, can be used for occasions such as laboratory power module test and flexible direct current engineering field converter valve handover test, debugging, overhaul or operation and maintenance, and improves the field test and operation and maintenance support capability of flexible direct current engineering.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. A flexible direct current converter valve power module test system is characterized by comprising a controller, a data acquisition terminal, a power supply system, a loop voltage drop detection circuit, an RC detection circuit, a double-pulse test circuit and an upper computer;
the power supply system is connected with the tested flexible direct current converter valve power module, the controller, the data acquisition terminal, the RC detection circuit and the double-pulse test circuit;
the data acquisition terminal is connected with the loop voltage drop detection circuit, the RC detection circuit, the double-pulse test circuit, the current sensor and the voltage sensor;
the controller is used for acquiring working state data of the tested flexible direct current converter valve power module, sending a control instruction to the tested flexible direct current converter valve power module IGBT and carrying out data analysis according to the acquired data sent by the data acquisition terminal;
the data acquisition terminal is used for acquiring acquisition data of the loop voltage drop detection circuit, the RC detection circuit, the double-pulse test circuit, the current sensor and the voltage sensor and transmitting the acquisition data to the controller;
the upper computer is used for receiving the data sent by the controller and storing and analyzing the data through data processing software;
the double-pulse test circuit is used for testing the IGBT dynamic and static parameters of the tested flexible direct current converter valve power module, acquiring the parameters and sending the parameters to the controller through the data acquisition terminal;
the RC detection circuit is used for charging and discharging a direct current capacitor of the tested flexible direct current converter valve power module, and estimating a capacitance value of the direct current capacitor and a resistance value of the voltage-sharing resistor, so that the controller sends an abnormal alarm when detecting that the capacitance value of the direct current capacitor or the resistance value of the voltage-sharing resistor is abnormal;
and the loop voltage drop detection circuit is used for detecting the loop voltage drop of the tested flexible direct current converter valve power module.
2. The system for testing the power module of the flexible direct current converter valve according to claim 1, wherein the step of charging and discharging a direct current capacitor of the tested flexible direct current converter valve power module and estimating a capacitance value of the direct current capacitor is performed, so that when the controller detects that the capacitance value of the direct current capacitor is abnormal, the step of sending an abnormal alarm comprises the steps of:
the controller collects the direct current capacitor voltage of the tested flexible direct current converter valve power module through the data collection terminal, judges whether the direct current capacitor voltage is 0, if yes, sends a low-voltage charging instruction to the RC detection circuit, controls the RC detection circuit to output the voltage to charge the tested flexible direct current power module, otherwise, controls the relay of the high-voltage discharging module of the power supply system to pull in, sends the low-voltage charging instruction to the RC detection circuit until the direct current capacitor discharges to 0V, and controls the RC detection circuit to output the voltage to charge the tested flexible direct current converter valve power module;
the controller monitors the 10V output voltage and the direct current capacitor voltage of the tested flexible direct current converter valve power module in real time through the data acquisition terminal, and fits a charging curve of the direct current capacitor voltage;
calculating the charging current of a charging resistor of the tested flexible direct current converter valve power module according to the fitted charging curve of the direct current capacitor voltage, and solving the equivalent resistance of a charging loop;
calculating the capacitance value of a direct current capacitor of the tested flexible direct current converter valve power module according to a charging curve of the voltage of the direct current capacitor and the equivalent resistance of a charging loop;
and comparing the calculated capacitance value of the direct current capacitor of the tested flexible direct current converter valve power module with a preset capacitance value, and if the difference value exceeds the limit value of the capacitance value, sending out an abnormal capacitance alarm.
3. The system for testing the power module of the flexible direct current converter valve according to claim 2, wherein the step of charging and discharging a direct current capacitor of the tested power module of the flexible direct current converter valve to estimate the resistance value of the equalizing resistor, so that when the controller detects that the resistance value of the equalizing resistor is abnormal, the step of sending an abnormal alarm comprises the steps of:
after the capacitance value of the direct current capacitor of the tested flexible direct current converter valve power module is calculated, the controller sends a low-voltage discharge instruction to the RC detection circuit, controls the RC detection circuit to close low-voltage output, and discharges the tested flexible direct current converter valve power module;
acquiring the voltage change of a direct current capacitor in the discharging process of the tested flexible direct current power module through a data acquisition device, and calculating the resistance value of a voltage-sharing resistor connected with the direct current capacitor in parallel by using a capacitor discharging formula;
and comparing the calculated voltage-sharing resistance value of the tested flexible direct current converter valve power module with a preset resistance value, and if the difference value exceeds a resistance limit value, sending a resistance abnormity alarm.
4. The flexible direct current converter valve power module test system of claim 3, wherein the controller is further configured to:
simulating valve control to issue a configuration command, and performing parameter configuration on the power module of the tested flexible direct current converter valve;
and the analog valve control issues a reset command to enable the tested flexible direct current converter valve power module to complete the reset of the latching fault signal.
5. The flexible direct current converter valve power module testing system of claim 4, wherein the controller is further configured to:
and continuously boosting the capacitor of the tested flexible direct current converter valve power module in a constant current source mode, testing the voltage rising slope in the boosting process, comparing the voltage rising slope with the factory capacitor charging voltage rising slope, and judging whether the charging loop of the tested flexible direct current converter valve power module is normal or not.
6. The flexible direct current converter valve power module testing system of claim 5, wherein the controller is further configured to:
and detecting the direct current port voltages at two ends of the direct current side collected by the tested flexible direct current converter valve power module, comparing the direct current port voltages with the direct current port voltages sent by the data collection terminal, and judging whether the voltage sampling function of the tested flexible direct current converter valve power module is normal or not.
7. The flexible direct current converter valve power module testing system of claim 6, wherein the controller is further configured to:
when the IGBT of the tested flexible direct current converter valve power module is locked, testing the alternating current port voltage and the direct current port voltage of the tested flexible direct current converter valve power module, and judging whether the partial pressure of the IGBT in a locked state is normal or not.
8. The flexible dc converter valve power module testing system of claim 7, wherein the controller is further configured to:
and issuing a bypass command to the tested power module of the flexible direct current converter valve, closing a bypass switch, and detecting whether the bypass command triggers a secondary circuit, the bypass switch stores energy and a bypass switch body is normal.
9. The flexible dc converter valve power module testing system of claim 8, wherein the controller is further configured to:
and acquiring a discharge time curve of the tested flexible direct current converter valve power module during natural discharge, comparing the discharge time curve with the RC discharge curve, and judging whether a discharge loop formed by the direct current capacitor and the voltage-sharing resistor is normal or not.
10. The flexible dc converter valve power module testing system of claim 8, wherein the controller is further configured to:
and acquiring the voltage of an output port of the tested power module of the flexible direct current converter valve, comparing the voltage with the trigger pulse sequence, and judging whether the voltage of the output port is matched with the trigger pulse sequence.
11. The system for testing the power module of the flexible direct current converter valve according to claim 8, wherein the controller is further configured to perform board card state detection on the tested power module of the flexible direct current converter valve, and specifically comprises:
according to the design power consumption of each secondary board card of the tested flexible direct current converter valve power module, calculating a power consumption default value of each secondary board card through the discharge rate change in the high-voltage discharge process, and positioning the fault board card according to the comparison result of the power consumption default value and the design power consumption.
12. The system for testing the power module of the flexible direct current converter valve according to claim 11, wherein the secondary board comprises an energy taking power board, a unit control board, a driving board, a contactor trigger board and a sampling trigger board.
13. The system for testing the power module of the flexible direct current converter valve according to claim 1, wherein the upper computer is further configured to:
and generating a health state report of the tested flexible direct current converter valve power module according to the data analysis result.
14. The flexible direct current converter valve power module test system according to any one of claims 1-13, further comprising an emergency stop module;
the scram module is used for connecting a direct-current capacitor into a small resistor to form a quick discharge loop when the tested flexible direct-current converter valve power module needs to be quickly discharged.
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| CN202111294574.0A CN113848413A (en) | 2021-11-03 | 2021-11-03 | Flexible direct current converter valve power module test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046907A (en) * | 2022-01-12 | 2022-02-15 | 南京谷贝电气科技有限公司 | Electric field energy taking temperature sensor calibration device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046907A (en) * | 2022-01-12 | 2022-02-15 | 南京谷贝电气科技有限公司 | Electric field energy taking temperature sensor calibration device and method |
| CN114046907B (en) * | 2022-01-12 | 2022-05-10 | 南京谷贝电气科技有限公司 | Electric field energy taking temperature sensor calibration device and method |
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