CN114264947A - Bypass switch testing device and testing method for flexible direct current power module - Google Patents
Bypass switch testing device and testing method for flexible direct current power module Download PDFInfo
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Abstract
The invention discloses a bypass switch testing device and a testing method for a flexible direct current power module, wherein the testing device comprises a main control system, a direct current power supply, a voltage withstanding testing module, a high-voltage pulse dv/dt module, a state measuring module, a contact resistance testing module, a charging loop and a bypass triggering module; the direct current power supply charges an energy storage capacitor in the charging loop; the voltage withstanding test module is used for detecting the primary and secondary side insulation voltage withstanding of the bypass switch; the high-voltage pulse dv/dt module is used for detecting the pulse tolerance capability of the bypass switch; the state measurement module is used for detecting the closing state and closing time of the bypass switch; the contact resistance testing module is used for detecting the switching-on impedance state of the main contact after the bypass switch is switched on; the bypass trigger module is used for providing a driving instruction for the closing of the bypass switch; the device can be conveniently connected to a bypass switch, can effectively trigger the bypass switch to be closed, and comprehensively tests key characteristics of the bypass switch such as voltage resistance, high-voltage pulse dv/dt, closing state, closing time and contact resistance.
Description
Technical Field
The invention belongs to the technical field of bypass switch testing of a flexible direct current power module, and particularly relates to bypass switch testing of a power module in a flexible direct current power transmission system.
Background
The modular multilevel converter based HVDC (modular multilevel converter based) technology is a novel voltage source converter direct-current transmission technology, and has been widely applied to the fields of new energy grid connection, asynchronous networking, multi-terminal direct-current transmission and the like.
Each bridge arm of the MMC converter valve is formed by connecting a plurality of submodules in series, each submodule is designed with a bypass function, and after a fault of a single power module occurs during the operation of the converter valve, the fault module is ensured to be quickly isolated by a bypass, so that the fault is prevented from further expanding and influencing the operation of the whole converter valve system. Based on the requirement, each power module is provided with a set of bypass switch equipment, one converter station is usually provided with thousands of bypass switches, and the reliability of the bypass switch equipment is the guarantee of the stable operation of the whole converter valve system.
The traditional bypass switch detection equipment is deviated from the aspect of practical application, and mainly meets the requirements of whether a bypass switch is switched on or not and whether the switching-on time meets a fast and reliable bypass or not, but still needs to be further strengthened on the aspects of voltage resistance, high-voltage pulse, contact impedance and the like of the bypass switch, so that the detection comprehensiveness of the bypass switch is improved. Meanwhile, one converter station has thousands of bypass switches, so that the number of the bypass switches is huge, and the simplicity and the high efficiency of a detection means are also the actual requirements of engineering.
Therefore, the key for solving the problems existing at present is to research a bypass switch testing method by combining the requirements of the flexible direct current converter valve and the characteristics of the bypass switch.
Disclosure of Invention
The invention provides a bypass switch testing device and a testing method for a flexible direct current power module, which are used for realizing continuous measurement of multiple quantities of bypass switches.
In order to achieve the purpose, the bypass switch testing device for the flexible direct current power module comprises a main control system, a direct current power supply, a voltage withstanding testing module, a high-voltage pulse dv/dt module, a state measuring module, a contact resistance testing module, a charging loop and a bypass triggering module; the direct current power supply, the voltage withstanding test module, the high-voltage pulse dv/dt module, the state measurement module, the contact resistance test module and the bypass trigger module are all connected with a main control system, and the main control system is used for providing logic control instructions for the direct current power supply, the voltage withstanding test module, the high-voltage pulse dv/dt module, the state measurement module, the contact resistance test module and the bypass trigger module; the direct current power supply is connected with the charging loop and used for performing direct current charging on the energy storage capacitor in the charging loop; the voltage-withstanding test module is connected with a main contact of the bypass switch and used for detecting the primary and secondary side insulation voltage-withstanding of the bypass switch; the high-voltage pulse dv/dt module is connected with a main contact of the bypass switch and is used for detecting the pulse tolerance of the bypass switch; the state measuring module is connected with the main contact and the auxiliary contact of the bypass switch and used for detecting the closing state and closing time of the bypass switch; the contact resistance testing module is connected with a main contact of the bypass switch and used for detecting the switching-on impedance state of the main contact after the bypass switch is switched on; the bypass trigger module is connected with the trigger switch and provides a driving instruction for the closing of the bypass switch.
Further, the high-voltage pulse dv/dt module comprises a DSP control board, a starting loop, an adjustable transformer T1, a rectification module and a pulse conversion module; the DSP control board is connected with the starting loop, the adjustable transformer and the pulse conversion module; the starting loop is connected with the adjustable transformer and the rectifying module in series to convert an alternating current power supply into a high-voltage direct current power supply, and the pulse conversion module is connected at two ends of the high-voltage direct current power supply in parallel.
Further, the starting circuit comprises a switch K1, a switch K2 and a resistor R0, the switch K2 and the resistor are connected in series to form a series branch, and the switch K1 is connected in parallel with the series branch.
Further, the pulse conversion module is connected in series by a plurality of identical half-bridge topology modules.
Furthermore, the output end of the high-voltage pulse dv/dt module is connected in series with a current-limiting resistor R4.
Further, the state measurement module is connected with a main contact and an auxiliary contact of the bypass switch, collects the closing time t1 of the main contact, the closing time t2 of the auxiliary contact and the bouncing time t3 of the contact switch through the I/O interface, and uploads the measurement parameters to the main control system.
Further, the charging loop comprises a current limiting resistor R1, an energy storage capacitor C1 and a separating switch S3 which are connected in series to form the loop.
The bypass switch testing method for the flexible direct current power module based on the testing device comprises the following steps:
step 1, setting test parameters in a main control system;
step 2, starting a voltage-withstanding test module, carrying out the next step when the test is qualified, and ending the test when the test is unqualified;
step 3, closing the voltage-withstanding test module, starting the high-voltage pulse dv/dt module to perform high-voltage pulse test, performing the next step if the test is qualified, and ending the test if the test is not qualified;
step 4, closing the high-voltage pulse dv/dt module, starting a direct-current power supply, charging an energy storage capacitor, detecting that the voltage of the energy storage capacitor reaches a set value, and closing the high-voltage direct-current power supply after the voltage is stable;
step 5, starting a bypass trigger module, after a control switch is switched on, enabling a capacitor to form a switching-on force through an excitation coil, enabling a bypass switch mechanism to act, and enabling a main contact and an auxiliary contact to act;
step 6, starting a state measuring module, measuring the closing time of the main contact, the bouncing time and the closing time of the auxiliary contact, and uploading data to a main control system;
step 7, starting a contact resistance testing module, testing the contact resistance of the main contact after closing, and judging the closing reliability of the main contact;
and 8, storing the test result and finishing the test.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the bypass switch can be conveniently and simply connected to a bypass switch mechanism, the bypass switch can be effectively triggered to be closed, key characteristics of the bypass switch such as voltage resistance, high-voltage pulse dv/dt, a closing state, closing time and contact resistance can be comprehensively tested, test items are comprehensive, the operation is simple and easy, the test efficiency is high, the reliability of the bypass switch is improved, and a guarantee foundation is laid for the operation of a power module of the flexible direct current converter valve.
The testing method provided by the invention has the advantages that the full-automatic control operation is carried out on the bypass switch of the power module, the testing is carried out according to strict pressure resistance, high-voltage pulse, switching-on and impedance testing sequential control logic, the standard comparison and judgment are carried out on the collected testing data in each link, and the rework testing is reduced; the control operation console can set parameters such as test voltage, test frequency, test voltage change rate and test time according to test requirements, test conditions of various working conditions are met, independent setting operation of multiple devices by personnel is reduced, test efficiency is improved, test data and results are automatically produced and reported, and the control operation device has the advantages of automatic sequential control operation, comprehensive test items, automatic judgment, production reports and the like, and is suitable for high-efficiency test of batch bypass switches.
Further, the high-voltage pulse dv/dt module comprises a DSP control board, a starting loop, an adjustable transformer T1, a rectification module and a pulse conversion module; the DSP control board is connected with the starting loop, the adjustable transformer and the pulse conversion module; the starting loop is connected with the adjustable transformer and the rectifying module in series to convert an alternating current power supply into a high-voltage direct current power supply, and the pulse conversion module is connected at two ends of the high-voltage direct current power supply in parallel; the DSP control panel is connected with the main control system, parameters are set through the main control system background according to test requirements, output voltage, output frequency, pulse duty ratio and test time are adjusted, the DSP control panel performs boosting and control pulse control on the adjustable transformer and the pulse conversion module, and the test requirements are met.
Furthermore, the pulse conversion module is formed by connecting a plurality of identical half-bridge topology modules in series, the sum of the output voltages of all the half-bridge topology modules is greater than the highest output voltage of the pulse conversion module, and even if voltage deviation is caused by difference of series impedance of the half-bridge topology modules, the output voltage of the pulse conversion module can meet the requirement.
Furthermore, the output end of the high-voltage pulse dv/dt module is connected in series with a current generation and limiting resistor for limiting the short circuit after the bypass switch breaks down, so that the safety of the testing device is improved.
Drawings
FIG. 1 is a schematic diagram of a bypass switch testing apparatus;
FIG. 2 is a circuit diagram of a soft DC power module;
FIG. 3 is a schematic diagram of a high voltage pulse dv/dt module;
FIG. 4 is a flow chart of a bypass switch testing method.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, a bypass switch testing apparatus for a soft dc power module includes a main control system, a dc power supply, a withstand voltage testing module, a high voltage pulse dv/dt module, a state measuring module, a contact resistance testing module, a charging loop, and a bypass trigger module. The direct current power supply, the voltage withstanding test module, the high-voltage pulse dv/dt module, the state measurement module, the contact resistance test module and the bypass trigger module are all connected with the main control system.
Referring to fig. 2, the flexible direct current power module is a power sub-module for a flexible direct current transmission converter valve, and includes a switching tube T1, a switching tube T2, an anti-parallel diode D1 of a switching tube T1, an anti-parallel diode D2 of a switching tube T2, a capacitor C, a discharge resistor R, and a bypass switch S, wherein the switching tube T1 is connected in series with the switching tube T2, a series connection point is a positive output end of the power module, and a negative electrode of the capacitor is a negative output end.
The voltage withstand test module is connected with a main contact S1 of the bypass switch, tests the alternating voltage of 10kV, the output frequency of 50Hz and the test time of 1 minute and is used for detecting the insulating and voltage withstand conditions of the primary side and the secondary side of the bypass switch; the withstand voltage test module selects 220V of power supply voltage, outputs 10kV of highest voltage, has 50Hz of output frequency, can be manufactured by Nanjing Entai, has model ET2671A, is provided with an RS232 serial communication interface, is used for communicating the withstand voltage test module with a main control system, reads a detection result, and comprises output voltage, output frequency, test current and test time.
The high-voltage pulse dv/dt module is connected with a main contact S1 of the bypass switch, tests the pulse voltage of 9kV, the maximum voltage change rate of 8kV/us, the test frequency of 200Hz, the pulse duty ratio of 80 percent and the test time of 10 minutes are carried out, and the high-voltage pulse dv/dt module is used for detecting the pulse tolerance of the bypass switch.
As shown in fig. 3, the high-voltage pulse dv/dt module includes a DSP control board, a start-up loop, an adjustable transformer T1, a rectifier module, a pulse conversion module, a current sensor CT, and a voltage sensor PT; the starting loop is connected with the adjustable transformer and the rectifying module in series, so that an alternating current power supply is converted into a high-voltage direct current power supply, the highest voltage is output to 9kV, and the starting charging time is 10 s; the starting circuit comprises a switch K1, a switch K2 and a resistor R0, wherein the switch K2 and the resistor are connected in series to form a series branch, and the switch K1 and the series branch are connected in parallel to form the starting circuit; the pulse conversion modules are connected in parallel at two ends of the high-voltage direct-current power supply, the pulse conversion modules are connected in series by 3 sets of identical half-bridge topology modules, each half-bridge topology module can meet the requirement of 3.5kV voltage operation, and the requirement of voltage deviation caused by series impedance difference of the half-bridge topology modules is met; the output of the high-voltage pulse dv/dt module is connected in series with a current-limiting resistor R4 for limiting the current after the bypass switch breaks down and is short-circuited, an output terminal A2 is connected with a main contact S1 of the bypass switch at a first end A1, an output terminal B2 is connected with a main contact S1 of the bypass switch at a second end B1, and the output of the high-voltage pulse dv/dt module is connected with a current sensor CT and a voltage sensor PT for detecting the output current and the output voltage. The DSP control board is connected with the starting loop, the adjustable transformer, the pulse conversion module, the current sensor feedback information and the voltage sensor feedback signal and provides logic control instructions of the starting loop, the adjustable transformer, the pulse conversion module, the current sensor and the voltage sensor.
The DSP control panel of the high-voltage pulse dv/dt module is connected with an external main control system, parameters can be set through a main control system background according to test requirements, output voltage, output frequency, pulse duty ratio and test time parameters are adjusted, the DSP control panel boosts the adjustable transformer and the pulse conversion module and controls pulses, and the test requirements are met. The high-voltage pulse dv/dt module selects 220V of power supply voltage, 10kV of highest output voltage, 8kV/us of maximum voltage change rate, 1kHz of highest output frequency and 90% of highest pulse duty ratio.
The state measurement module is connected with a main contact S1 and an auxiliary contact S2 of the bypass switch, acquires the closing time t1, the closing time t2 and the bouncing time t3 of the main contact of the contact switch through an I/O interface, and is used for detecting the closing state and the closing time of the bypass switch; the state measurement module selects the power supply voltage of 220V, the power of 30W and outputs 24V, and measurement parameters are uploaded to the main control system.
The contact resistance testing module is connected with a main contact of the bypass switch and used for detecting the resistance parameter of a closing loop of the main contact after the bypass switch is closed; the contact resistance test module adopts a current-voltage method for measurement, the power supply voltage is 220V, the power is 500W, the maximum output current is 200A, the measurement range is 5u omega-20 m omega, the contact resistance test module can be manufactured by Wuhan national electric and Western high electric company, the model is GDHL-200, and the contact resistance test module is used for communicating with a main control system, reading a detection result, and comprises test resistance and test time. The main control system is the core of the testing device, is connected with the direct current power supply, the voltage-withstanding testing module, the high-voltage pulse dv/dt module, the state measuring module, the contact resistance testing module and the bypass triggering module, provides logic control instructions for the direct current power supply, the voltage-withstanding testing module, the high-voltage pulse dv/dt module, the state measuring module, the contact resistance testing module and the bypass triggering module, performs interactive communication, and collects testing data in real time for judgment.
The DC power supply is supplied by external AC, the inside is converted into DC adjustable voltage, the highest voltage can reach 1000V, and the DC adjustable voltage is connected with the charging loop to carry out DC charging on the energy storage capacitor C1; the power supply voltage of the high-voltage power supply is 220V, the power is 1kW, and the highest output voltage is 1000V.
The charging loop comprises a current-limiting resistor R1, an energy-storage capacitor C1 and a disconnecting switch S3, and the three form a series loop; the test sample bypass switch comprises an excitation coil, a main contact, an auxiliary contact and a connecting mechanism, wherein the excitation coil is connected with the control switch in series and connected with two ends of the energy storage capacitor in parallel.
The bypass trigger module is connected with the control switch and provides a driving instruction for the closing of the bypass switch.
Referring to fig. 4, the bypass switch testing method of the soft dc power module includes:
1) and the tester transacts the power-on operation ticket to supply power for the bypass switch testing device, so that the normal electrification of the equipment is ensured.
2) The testing personnel set and store the testing parameters in the main control system, and the testing parameters comprise: the voltage-withstanding test device comprises a voltage-withstanding test voltage Ut1, a voltage-withstanding test time t1, a high-voltage pulse test voltage Ut2, a high-voltage pulse test time t2, a high-voltage pulse dv/dt change value m, a high-voltage pulse switching frequency k and an energy storage capacitor voltage Uc.
3) And starting the test, starting the voltage withstand test module by the main control system, raising the voltage of the two ends of the tested switch to Ut1, carrying out the voltage withstand test on the bypass switch, carrying out the next step if the voltage withstand test is qualified, and finishing if the voltage withstand test is not qualified, and carrying out the inspection.
4) And the main control system closes the voltage-withstanding test module, starts the high-voltage pulse dv/dt module, outputs the test voltage Ut2 loaded on the test switch, the high-voltage pulse test time t2, the high-voltage pulse dv/dt change value m and the high-voltage pulse switch frequency k, detects the leakage current and the port voltage waveform of the test switch, and if the test is qualified, the test is finished, and if the test is not qualified, the test is carried out.
5) And the main control system closes the high-voltage pulse dv/dt module, starts the direct-current power supply, charges the energy storage capacitor C1, detects that the voltage of the energy storage capacitor reaches the set energy storage capacitor voltage Uc, determines the Uc according to the excitation coil impedance and the excitation current of the test sample switch, and closes the high-voltage direct-current power supply after the voltage is stable.
6) The main control system starts the bypass triggering module and the state measuring module to issue a control switch instruction, after the control switch is switched on, the energy storage capacitor C1 forms switching-on force through the magnet exciting coil KM1, the bypass switching mechanism acts, and the main contact and the auxiliary contact act. And measuring the closing time ta, the bounce time tb and the closing time tc of the auxiliary contact of the main contact, and uploading the closing time to the main control system.
7) And the main control system starts the contact resistance testing module to test the contact resistance R after the main contact is switched on, and judges whether the contact resistance is qualified or not and judges the switching-on reliability of the test switch.
8) And resetting all the instructions to an initial state by the main control system, storing the test result and finishing the test.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A bypass switch testing device for a flexible direct current power module is characterized by comprising a main control system, a direct current power supply, a voltage withstanding testing module, a high-voltage pulse dv/dt module, a state measuring module, a contact resistance testing module, a charging loop and a bypass triggering module;
the direct current power supply, the voltage withstanding test module, the high-voltage pulse dv/dt module, the state measurement module, the contact resistance test module and the bypass trigger module are all connected with a main control system, and the main control system is used for providing logic control instructions for the direct current power supply, the voltage withstanding test module, the high-voltage pulse dv/dt module, the state measurement module, the contact resistance test module and the bypass trigger module;
the direct current power supply is connected with the charging loop and used for performing direct current charging on the energy storage capacitor in the charging loop;
the voltage-withstanding test module is connected with a main contact of the bypass switch and is used for detecting the primary and secondary side insulation voltage-withstanding of the bypass switch;
the high-voltage pulse dv/dt module is connected with a main contact of the bypass switch and is used for detecting the pulse tolerance of the bypass switch;
the state measuring module is connected with a main contact and an auxiliary contact of the bypass switch and is used for detecting the closing state and closing time of the bypass switch;
the contact resistance testing module is connected with a main contact of the bypass switch and used for detecting the switching-on impedance state of the main contact after the bypass switch is switched on;
the bypass trigger module is connected with the trigger switch and provides a driving instruction for the closing of the bypass switch.
2. The bypass switch testing device for the soft dc power module according to claim 1, wherein the high voltage pulse dv/dt module comprises a DSP control board, a start loop, an adjustable transformer T1, a rectifier module and a pulse conversion module; the DSP control board is connected with the starting loop, the adjustable transformer and the pulse conversion module; the starting loop is connected with the adjustable transformer and the rectifying module in series to convert an alternating current power supply into a high-voltage direct current power supply, and the pulse conversion module is connected to two ends of the high-voltage direct current power supply in parallel.
3. The bypass switch test device for the FLDC power module as recited in claim 2, wherein the start-up loop comprises a switch K1, a switch K2 and a resistor R0, the switch K2 and the resistor are connected in series to form a series branch, and the switch K1 is connected in parallel with the series branch.
4. The apparatus of claim 2, wherein the pulse conversion module is connected in series by a plurality of identical half-bridge topology modules.
5. The device for testing the bypass switch of the soft direct power module as claimed in claim 2, wherein a current limiting resistor R4 is connected in series with the output end of the high voltage pulse dv/dt module.
6. The device as claimed in claim 1, wherein the state measurement module is connected to the main contact and the auxiliary contact of the bypass switch, collects the closing time t1 of the main contact, the closing time t2 of the auxiliary contact and the bounce time t3 of the contact switch through the I/O interface, and uploads the measurement parameters to the main control system.
7. The device for testing the bypass switch of the FLDC power module as claimed in claim 1, wherein the charging loop comprises a current limiting resistor R1, an energy storage capacitor C1 and a separating switch S3 connected in series to form a loop.
8. The method for testing the bypass switch of the soft dc power module of the testing device according to claim 1, comprising the steps of:
step 1, setting test parameters in a main control system;
step 2, starting a voltage-withstanding test module, carrying out the next step when the test is qualified, and ending the test when the test is unqualified;
step 3, closing the voltage-withstanding test module, starting the high-voltage pulse dv/dt module to perform high-voltage pulse test, performing the next step if the test is qualified, and ending the test if the test is not qualified;
step 4, closing the high-voltage pulse dv/dt module, starting a direct-current power supply, charging an energy storage capacitor, detecting that the voltage of the energy storage capacitor reaches a set value, and closing the high-voltage direct-current power supply after the voltage is stable;
step 5, starting a bypass trigger module, after a control switch is switched on, enabling a capacitor to form a switching-on force through an excitation coil, enabling a bypass switch mechanism to act, and enabling a main contact and an auxiliary contact to act;
step 6, starting a state measuring module, measuring the closing time of the main contact, the bouncing time and the closing time of the auxiliary contact, and uploading data to a main control system;
step 7, starting a contact resistance testing module, testing the contact resistance of the main contact after closing, and judging the closing reliability of the main contact;
and 8, storing the test result and finishing the test.
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| CN114977504A (en) * | 2022-06-02 | 2022-08-30 | 国网山东省电力公司泰安供电公司 | Bypass load switch control system |
| CN116106709A (en) * | 2022-11-30 | 2023-05-12 | 中国南方电网有限责任公司超高压输电公司广州局 | Testing device and method suitable for bypass switch of IGBT power module |
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| CN112034322A (en) * | 2020-08-17 | 2020-12-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Overvoltage bypass test loop and test method for MMC power module thyristor |
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