CN107037288B - Damping module testing system and testing method - Google Patents
Damping module testing system and testing method Download PDFInfo
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- CN107037288B CN107037288B CN201710291675.XA CN201710291675A CN107037288B CN 107037288 B CN107037288 B CN 107037288B CN 201710291675 A CN201710291675 A CN 201710291675A CN 107037288 B CN107037288 B CN 107037288B
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- damping module
- bidirectional
- flow switch
- power supply
- damping
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses a damping module testing system which comprises a power supply unit, a control unit, a signal output unit and a measuring unit, wherein the power supply unit provides electric energy for the work of each secondary control board card; the control unit transmits a control signal to the damping module and receives a return signal of the damping module; the signal output unit applies an external excitation signal to the damping module to be tested; the measuring unit detects the voltage between the power terminals of the damping module. The test system is simple and reliable, low in cost and high in automation degree, is suitable for factory testing, field detection and fault maintenance of damping modules applied to high-power converters and flexible AC/DC transmission systems, and is easy to popularize in similar application occasions. The invention also discloses a test method of the damping module test system.
Description
Technical Field
The invention belongs to the technical field of power electronic equipment testing, and particularly relates to a damping module testing system and a damping module testing method.
Background
The flexible direct current transmission technology based on the modularized multi-level converter (Modular Multilevel Converter, MMC) technology has wide application prospect, and the probability of direct current short circuit fault is very high because the length of the direct current transmission line can reach thousands of kilometers. At present, a common modularized multi-level converter valve submodule based on a half-bridge structure generally cannot limit short-circuit current by adopting a method of controlling or locking a converter when a direct current side fails due to the existence of an anti-parallel freewheeling diode of a fully-controlled switching device, and generally can break fault current only by breaking an alternating current side breaker, so that quick recovery cannot be realized after a system fails.
The damping module is added into the bridge arm of the converter, and after the direct current side fails, the bidirectional through-flow switch of the damping module is quickly locked, and the damping resistor is put into, so that the rising rate of direct current short-circuit current can be effectively inhibited, and the quick attenuation of fault current after the alternating current side circuit breaker is tripped can be quickened.
The damping module mainly comprises a primary element and a secondary control board card. The primary element mainly comprises a damping resistor R, a bidirectional through-flow switch and a bypass switch KM, wherein the bidirectional through-flow switch consists of a fully-controlled device and an anti-parallel freewheeling diode D.
The damping module needs to be subjected to detailed and complete functional test during in-factory test to improve test efficiency and accuracy, and needs to be subjected to quick and simple on-site functional test to determine a fault point when on-site operation fails, and meanwhile, needs to be subjected to special performance test after repair to determine whether the damping module can be put into use or not.
At present, the function test of the damping module is mainly carried out by means of auxiliary power supplies, universal meters and other tools, the automation degree of the tools is low, the test speed and accuracy cannot be considered, the test method is not mature, the test means are single, therefore, a stable and reliable test system and a test method thereof are needed, the test speed and accuracy are improved, and the scheme is based on the function test requirement of the damping module.
Disclosure of Invention
The invention aims to provide a damping module testing system and a damping module testing method, which are simple and reliable, low in cost and high in automation degree, are suitable for factory testing, field detection and fault maintenance of damping modules applied to high-power converters and flexible AC/DC transmission systems, and are easy to popularize in similar application occasions.
In order to achieve the above object, the solution of the present invention is:
the damping module to be tested comprises a primary element and a secondary control board card, wherein the primary element comprises a damping resistor, a bidirectional through-flow switch and a bypass switch, and the bidirectional through-flow switch consists of a full-control switching device and an anti-parallel freewheeling diode; the testing system comprises a power supply unit, a control unit, a signal output unit and a measuring unit, wherein the output end of the power supply unit is connected with the input end of the damping module power board card to supply electric energy for the work of each secondary control board card; the control unit is connected with the damping module through a transmitting optical fiber and a receiving optical fiber respectively, and transmits a control signal to the damping module and receives a return signal of the damping module; the signal output unit consists of a signal source and a voltage dividing resistor, is connected with a power terminal of the damping module to be tested, and applies an external excitation signal to the damping module to be tested; the measuring unit is connected with the power terminal of the damping module to be measured, and detects the voltage between the power terminals of the damping module.
The control unit is connected with the secondary control board card communication optical port of the damping module through the transmitting optical fiber and the receiving optical fiber respectively.
The voltage dividing resistor is formed by cascading at least one resistor.
The signal source in the signal output unit adopts a direct current power supply or an alternating current power supply, when the signal source adopts the direct current power supply, the positive electrode of the direct current power supply is connected with the positive electrode of the damping module bidirectional through-flow switch, and the negative electrode of the direct current power supply is connected with the negative electrode of the damping module bidirectional through-flow switch.
The fully-controlled switching device of the bidirectional through-flow switch adopts an IGBT, wherein the collector of the IGBT is used as the positive electrode of the bidirectional through-flow switch, and the emitter of the IGBT is used as the negative electrode of the bidirectional through-flow switch.
The fully-controlled switching device of the bidirectional through-flow switch adopts at least one IGCT or at least one GTO, takes the anode of the IGCT or the GTO as the positive electrode of the bidirectional through-flow switch, and takes the cathode of the IGCT or the GTO as the negative electrode of the bidirectional through-flow switch.
A test method of a damping module test system comprises the following steps:
step 1, completing connection of a damping module testing system and a damping module to be tested;
step 2, starting a power supply unit to supply power for the secondary control board card of the damping module;
step 3, after the control unit performs self-checking of the test system, a control instruction and a trigger pulse signal are sent to the damping module to be tested according to the test requirement;
step 4, the control unit judges the received control command and state information reported by the damping module to be tested, if the control command is not received or abnormal state information is received, the damping module to be tested is judged to be faulty, the pulse is blocked immediately, the fault information is prompted, and if no abnormality exists, the step 5 is shifted;
step 5, the control unit receives the measured value of the measuring unit as a test judgment basis and displays the measured value in real time, if the measured value is abnormal, the damping module to be tested is judged to be faulty, the pulse is immediately blocked, fault information is prompted, and if the measured value is not abnormal, the test is continued;
and 6, after the test system finishes the test, the control unit displays the test result in real time and disconnects the power supply unit.
After the scheme is adopted, the invention has the following characteristics:
(1) The damping module testing system is simple and reliable in principle. When the driving pulse of the bidirectional through-flow switch full-control type switching device of the damping module is blocked, the terminal voltage acquired by the measuring system is the voltage shared by the damping resistor in a series circuit formed by the damping resistor and the voltage dividing resistor; when the driving pulse of the full-control type switching device of the bidirectional through-flow switch of the damping module is on, the terminal voltage acquired by the measuring system is the device conduction voltage drop of the bidirectional through-flow switch, and whether the full-control type switching device of the bidirectional through-flow switch is normally on or off is judged by utilizing the terminal voltage change acquired by the measuring unit before and after the full-control type switching device of the bidirectional through-flow switch applies the driving pulse.
(2) The damping module testing system can realize detailed and complete functional testing of each component of the damping module, has high degree of automation, and can rapidly detect and report faults to a control unit for display when the damping module to be tested breaks down.
(3) The damping module test system can integrate all the constituent units into one physical device, can also form a system together by taking the discrete physical devices as all the units, has simple and reliable test principle and high test efficiency, and only needs to provide single-phase alternating current commercial power which is convenient and easy to obtain as a power supply.
Drawings
FIG. 1 is a block diagram of a damping module testing system according to the present invention.
Detailed Description
The technical scheme of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a damping module testing system, wherein a damping module to be tested mainly comprises a primary element and a secondary control board card, the primary element mainly comprises a damping resistor R, a bidirectional through-flow switch and a bypass switch KM, and the bidirectional through-flow switch comprises a full-control type switching device and an anti-parallel freewheeling diode D; the test system comprises a power supply unit P, a control unit C, a signal output unit S and a measurement unit M, wherein the power supply unit P can adopt alternating current mains supply for input, and the output end of the power supply unit P is connected with the input end of a damping module power supply board card to supply electric energy for the work of each secondary control board card; the control unit C is connected with a communication optical port of the secondary control board card through a transmitting optical fiber TX and a receiving optical fiber RX, and transmits a control signal to the damping module to be tested and receives a return signal of the damping module; the signal output unit S is composed of a signal source and a voltage dividing resistor, is connected with a power terminal of the damping module to be tested, and applies an external excitation signal to the damping module to be tested, wherein the voltage dividing resistor is formed by cascading at least one resistor; the measuring unit M is connected with the power terminals M1 and M2 of the damping module to be measured, and detects the voltage between the power terminals of the damping module to be measured.
When the signal source adopts the direct current power supply, the positive electrode of the direct current power supply is connected with the positive electrode of the bidirectional through-flow switch of the damping module to be tested, and the negative electrode of the direct current power supply is connected with the negative electrode of the bidirectional through-flow switch of the damping module to be tested.
The fully-controlled switching device of the bidirectional through-flow switch can adopt an IGBT, wherein a collector of the IGBT is used as an anode of the bidirectional through-flow switch, and an emitter of the IGBT is used as a cathode of the bidirectional through-flow switch; or the fully-controlled switching device of the bidirectional through-flow switch is formed by at least one IGCT or at least one GTO, wherein the anode of the IGCT or the GTO is used as the positive electrode of the bidirectional through-flow switch, and the cathode of the IGCT or the GTO is used as the negative electrode of the bidirectional through-flow switch.
The power supply unit P, the control unit C, the signal output unit S and the measuring unit M can be integrated in one physical device, or the units can be discrete physical devices to form a system together.
The principle of testing the on-off function of the fully-controlled switching device is as follows: when the driving pulse of the bidirectional through-flow switch full-control type switching device of the damping module is blocked, the terminal voltage acquired by the measuring system is the voltage shared by the damping resistor in a series circuit formed by the damping resistor and the voltage dividing resistor; when the driving pulse of the full-control type switching device of the bidirectional through-flow switch of the damping module is on, the terminal voltage acquired by the measuring system is the conduction voltage drop of the full-control type switching device of the bidirectional through-flow switch, and whether the full-control type switching device of the bidirectional through-flow switch is normally on or off is judged by utilizing the terminal voltage change acquired by the measuring unit before and after the driving pulse is applied to the full-control type switching device of the bidirectional through-flow switch.
Based on the above test principle, the invention also provides a test method of the damping module test system, which comprises the following steps:
step 1, firstly, wiring and optical fiber connection of a damping module testing system and a damping module to be tested are completed;
step 2, a power supply unit P is started to supply power for the secondary control board card of the damping module;
step 3, the control unit C performs self-checking of the test system firstly, and then sends a control instruction and a trigger pulse signal to the damping module to be tested according to the test requirement;
step 4, the control unit C judges the received control command and state information reported by the damping module to be tested, if the control command is not received or abnormal state information is received, the damping module to be tested is judged to be faulty, the pulse is blocked immediately, the fault information is prompted, and if no abnormality exists, the step 5 is shifted;
step 5, the control unit C receives the measured value of the measuring unit M as a test judgment basis and displays the measured value in real time, if the measured value is abnormal, the damping module to be tested is judged to be faulty, the pulse is immediately blocked, fault information is prompted, and if no abnormality exists, the test is continued;
and 6, after the test system finishes the test, the control unit C displays the test result in real time and disconnects the power supply unit.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (4)
1. The damping module to be tested comprises a primary element and a secondary control board card, wherein the primary element comprises a damping resistor, a bidirectional through-flow switch and a bypass switch, and the bidirectional through-flow switch consists of a full-control switching device and an anti-parallel freewheeling diode; the method is characterized in that: the testing system comprises a power supply unit, a control unit, a signal output unit and a measuring unit, wherein the output end of the power supply unit is connected with the input end of the damping module power board card to supply electric energy for the work of each secondary control board card; the control unit is connected with the damping module through a transmitting optical fiber and a receiving optical fiber respectively, and transmits a control signal to the damping module and receives a return signal of the damping module; the signal output unit consists of a signal source and a voltage dividing resistor, is connected with a power terminal of the damping module to be tested, and applies an external excitation signal to the damping module to be tested; the measuring unit is connected with the power terminal of the damping module to be measured, and detects the voltage between the power terminals of the damping module;
the full-control type switching device of the bidirectional through-flow switch adopts an IGBT, wherein a collector of the IGBT is used as an anode of the bidirectional through-flow switch, and an emitter of the IGBT is used as a cathode of the bidirectional through-flow switch;
the signal source in the signal output unit adopts a direct current power supply or an alternating current power supply, when the signal source adopts the direct current power supply, the positive electrode of the direct current power supply is connected with the positive electrode of the damping module bidirectional through-flow switch, and the negative electrode of the direct current power supply is connected with the negative electrode of the damping module bidirectional through-flow switch;
the voltage dividing resistor is formed by cascading at least one resistor.
2. A damping module testing system as defined in claim 1, wherein: the control unit is connected with the secondary control board card communication optical port of the damping module through the transmitting optical fiber and the receiving optical fiber respectively.
3. A damping module testing system as defined in claim 1, wherein: the full-control type switching device of the bidirectional through-flow switch adopts at least one IGCT or at least one GTO, wherein the anode of the IGCT or the GTO is used as the positive electrode of the bidirectional through-flow switch, and the cathode of the IGCT or the GTO is used as the negative electrode of the bidirectional through-flow switch.
4. A method of testing a damping module testing system according to any one of claims 1-3, comprising the steps of:
step 1, completing connection of a damping module testing system and a damping module to be tested;
step 2, starting a power supply unit to supply power for the secondary control board card of the damping module;
step 3, after the control unit performs self-checking of the test system, a control instruction and a trigger pulse signal are sent to the damping module to be tested according to the test requirement;
step 4, the control unit judges the received control command and state information reported by the damping module to be tested, if the control command is not received or abnormal state information is received, the damping module to be tested is judged to be faulty, the pulse is blocked immediately, the fault information is prompted, and if no abnormality exists, the step 5 is shifted;
step 5, the control unit receives the measured value of the measuring unit as a test judgment basis and displays the measured value in real time, if the measured value is abnormal, the damping module to be tested is judged to be faulty, the pulse is immediately blocked, fault information is prompted, and if the measured value is not abnormal, the test is continued;
and 6, after the test system finishes the test, the control unit displays the test result in real time and disconnects the power supply unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710291675.XA CN107037288B (en) | 2017-04-28 | 2017-04-28 | Damping module testing system and testing method |
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| CN201710291675.XA CN107037288B (en) | 2017-04-28 | 2017-04-28 | Damping module testing system and testing method |
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| CN107037288B true CN107037288B (en) | 2023-09-08 |
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