CN113406408B - Flexible direct current converter valve power module bypass switch error-closing test method and circuit - Google Patents
Flexible direct current converter valve power module bypass switch error-closing test method and circuit Download PDFInfo
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- CN113406408B CN113406408B CN202110531972.3A CN202110531972A CN113406408B CN 113406408 B CN113406408 B CN 113406408B CN 202110531972 A CN202110531972 A CN 202110531972A CN 113406408 B CN113406408 B CN 113406408B
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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
- G01R31/003—Environmental or reliability tests
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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
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Abstract
The invention provides a method and a circuit for testing the false closing of a bypass switch of a power module of a flexible direct current converter valve, wherein the method is suitable for the circuit and comprises the following steps: when the first insulated gate bipolar transistor is tested, a main controller sends a switching-on instruction to the first insulated gate bipolar transistor, so that current flows from the first insulated gate bipolar transistor to a load reactance, and load current is generated at two ends of the load reactance; when the first insulated gate bipolar transistor is detected to be through-current, a trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake; when the power module controller detects the trigger signal, protection is started, and the first insulated gate bipolar transistor is turned off so as to prevent the first insulated gate bipolar transistor from generating a through short circuit with the first bypass switch. By implementing the embodiment of the invention, whether the protection measures of the power module of the flexible direct current converter valve are effective or not can be verified when the bypass switch is switched on by mistake in the normal operation process of the power module of the flexible direct current converter valve.
Description
Technical Field
The invention relates to the technical field of flexible direct current power transmission, in particular to a method and a circuit for testing the error closing of a bypass switch of a power module of a flexible direct current converter valve.
Background
At present, the prior art has a few researches on the error closing test of the bypass switch of the power module of the flexible direct current converter valve. The inventor finds that when the bypass switch of the flexible direct current converter valve power module is mistakenly closed, if the protection measure of the flexible direct current converter valve power module is not effective, the flexible direct current converter valve power module is damaged, and therefore the technical problem to be solved urgently is to provide the test circuit and the test method for the mistaken closing of the bypass switch of the flexible direct current converter valve power module to verify whether the protection measure of the flexible direct current converter valve power module is effective.
Disclosure of Invention
The invention aims to provide an electric method and a circuit for a bypass switch false switching test of a flexible direct current converter valve power module, so as to verify whether protection measures of the flexible direct current converter valve power module are effective or not when the bypass switch false switching occurs in the normal operation process of the flexible direct current converter valve power module.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a method for testing a bypass switch mis-closing of a flexible dc converter valve power module, which is suitable for a testing circuit for testing a bypass switch mis-closing of a flexible dc converter valve power module, and includes:
when a first insulated gate bipolar transistor is tested, a main controller sends a switching-on instruction to the first insulated gate bipolar transistor, so that current flows from the first insulated gate bipolar transistor to a load reactance, and load current is generated at two ends of the load reactance;
when the first insulated gate bipolar transistor is detected to be through-current, a trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake;
when the power module controller detects the trigger signal, starting protection, and turning off the first insulated gate bipolar transistor to prevent the first insulated gate bipolar transistor and the first bypass switch from generating a through short circuit;
wherein, flexible direct current converter valve power module bypass switch mistake closes test circuit includes: a module under test and the load reactance; the module under test includes: the first capacitor, the first resistor, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the first diode, the second diode and the first bypass switch; the first capacitor is connected in parallel with the first resistor, the emitter of the first insulated gate bipolar transistor is connected with the collector of the second insulated gate bipolar transistor, the collector of the first insulated gate bipolar transistor is connected with one end of the first resistor, the emitter of the second insulated gate bipolar transistor is connected with the other end of the first resistor, the anode of the first diode is connected with the emitter of the first insulated gate bipolar transistor, the cathode of the first diode is connected with the collector of the first insulated gate bipolar transistor, the anode of the second diode is connected with the emitter of the second insulated gate bipolar transistor, and the cathode of the second diode is connected with the collector of the second insulated gate bipolar transistor; the first bypass switch is connected in parallel with the second diode, one end of the load reactance is connected with one end of the first bypass switch, and the other end of the load reactance is connected with the other end of the first bypass switch.
Further, the test method for the misclosing of the bypass switch of the flexible direct current converter valve power module further comprises the following steps:
when the first diode is tested, sending a preset-duration turn-on command to the second insulated gate bipolar transistor and the third insulated gate bipolar transistor through the main controller, so that current flows from the third insulated gate bipolar transistor to the load reactance and the second insulated gate bipolar transistor in sequence, and the load reactance generates load current;
when the load current reaches a set current, the second insulated gate bipolar transistor is locked, the first insulated gate bipolar transistor is switched on, and the load current is converted into a loop formed by a third insulated gate bipolar transistor and a first diode;
when the first diode is detected to be through-flowing, a second trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake;
when the power module controller detects the second trigger signal, protection is started, and the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are locked to prevent the first diode and the first bypass switch from generating a through short circuit;
wherein the test circuit for testing the misclosing of the bypass switch of the power module of the flexible direct current converter valve also comprises an accompanying test module,
the accompanying module comprises a second capacitor, a second resistor, a third insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a third diode, a fourth diode and a second bypass switch; an emitter of the third insulated gate bipolar transistor is connected to a collector of the fourth insulated gate bipolar transistor, an anode of the third diode is connected to the emitter of the third insulated gate bipolar transistor, a cathode of the third diode is connected to the collector of the third insulated gate bipolar transistor, an anode of the fourth diode is connected to the emitter of the fourth insulated gate bipolar transistor, and a cathode of the fourth diode is connected to the collector of the fourth insulated gate bipolar transistor; a collector of the third insulated gate bipolar transistor is connected with one end of the second resistor, an emitter of the fourth insulated gate bipolar transistor is connected with the other end of the second resistor, and the second capacitor is connected with the second resistor in parallel;
when the flexible direct current converter valve power module bypass switch mismatching test circuit further comprises an accompanying test module, the other end of the load reactance is connected with the other end of the first bypass switch through a second bypass switch; the other end of the load reactance is further connected with the collector of the fourth insulated gate bipolar transistor, one end of the second bypass switch, which is connected with the first bypass switch, is further connected with the emitter of the fourth insulated gate bipolar transistor, and the cathode of the first diode is further connected with the collector of the third insulated gate bipolar transistor.
In a second aspect, an embodiment of the present invention provides a flexible dc converter valve power module bypass switch mis-on test circuit, which is suitable for the flexible dc converter valve power module bypass switch mis-on test method, and includes: the device comprises a tested module, an accompanying module and a load reactance;
the module under test includes: the circuit comprises a first capacitor, a first resistor, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a first diode, a second diode and a first bypass switch; the first capacitor is connected in parallel with the first resistor, the emitter of the first insulated gate bipolar transistor is connected with the collector of the second insulated gate bipolar transistor, the collector of the first insulated gate bipolar transistor is connected with one end of the first resistor, the emitter of the second insulated gate bipolar transistor is connected with the other end of the first resistor, the anode of the first diode is connected with the emitter of the first insulated gate bipolar transistor, the cathode of the first diode is connected with the collector of the first insulated gate bipolar transistor, the anode of the second diode is connected with the emitter of the second insulated gate bipolar transistor, and the cathode of the second diode is connected with the collector of the second insulated gate bipolar transistor; the first bypass is connected in parallel with the second diode;
the accompanying module comprises a second capacitor, a second resistor, a third insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a third diode, a fourth diode and a second bypass switch; an emitter of the third insulated gate bipolar transistor is connected to a collector of the fourth insulated gate bipolar transistor, an anode of the third diode is connected to the emitter of the third insulated gate bipolar transistor, a cathode of the third diode is connected to the collector of the third insulated gate bipolar transistor, an anode of the fourth diode is connected to the emitter of the fourth insulated gate bipolar transistor, and a cathode of the fourth diode is connected to the collector of the fourth insulated gate bipolar transistor; a collector of the third insulated gate bipolar transistor is connected with one end of the second resistor, an emitter of the fourth insulated gate bipolar transistor is connected with the other end of the second resistor, and the second capacitor is connected with the second resistor in parallel;
one end of the first bypass switch is further connected with one end of the load reactance, the other end of the first bypass switch is further connected with one end of the second bypass switch, the other end of the second bypass switch is connected with the other end of the load reactance, the other end of the load reactance is further connected with the collector of the fourth insulated gate bipolar transistor, one end of the second bypass switch is further connected with the emitter of the fourth insulated gate bipolar transistor, and the cathode of the first diode is further connected with the collector of the third insulated gate bipolar transistor.
Further, flexible direct current converter valve power module bypass switch mistake closes test circuit, still includes:
a control system comprising a main controller, a power module controller and a bypass switch-on controller; the tested module and the accompanying module are connected and respectively connected with the main controller, the bypass switch-on controller is connected with the tested module, and the power module controller is connected with the tested module.
Furthermore, the flexible direct current converter valve power module bypass switch false-closing test circuit also comprises an alternating current power supply, a controllable voltage regulator, a high-voltage rectifier bridge, a direct current voltage discharge loop and a water cooling system; alternating current power supply with controllable voltage regulator connects, controllable voltage regulator with the high-pressure rectifier bridge is connected, the high-pressure rectifier bridge with direct voltage discharge circuit connects, direct voltage discharge circuit with by the test module connection, water cooling system still with accompany the test module connection.
The method for testing the error connection of the bypass switch of the power module of the flexible direct current converter valve, which is provided by the embodiment of the invention, is suitable for a test circuit for the error connection of the bypass switch of the power module of the flexible direct current converter valve, and comprises the following steps: when the first insulated gate bipolar transistor is tested, a main controller sends a switching-on command to the first insulated gate bipolar transistor, so that current flows from the first insulated gate bipolar transistor to a load reactance, and load current is generated at two ends of the load reactance; when the first insulated gate bipolar transistor is detected to be through-current, a trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake; when the power module controller detects the trigger signal, starting protection, and turning off the first insulated gate bipolar transistor to prevent the first insulated gate bipolar transistor and the first bypass switch from generating a through short circuit; wherein, flexible direct current converter valve power module bypass switch mistake closes test circuit includes: a module under test and the load reactance; the module under test includes: the first capacitor, the first resistor, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the first diode, the second diode and the first bypass switch; the first capacitor is connected in parallel with the first resistor, the emitter of the first insulated gate bipolar transistor is connected with the collector of the second insulated gate bipolar transistor, the collector of the first insulated gate bipolar transistor is connected with one end of the first resistor, the emitter of the second insulated gate bipolar transistor is connected with the other end of the first resistor, the anode of the first diode is connected with the emitter of the first insulated gate bipolar transistor, the cathode of the first diode is connected with the collector of the first insulated gate bipolar transistor, the anode of the second diode is connected with the emitter of the second insulated gate bipolar transistor, and the cathode of the second diode is connected with the collector of the second insulated gate bipolar transistor; the first bypass switch is connected in parallel with the second diode, one end of the load reactance is connected with one end of the first bypass switch, and the other end of the load reactance is connected with the other end of the first bypass switch. By implementing the embodiment of the invention, whether the protection measures of the power module of the flexible direct current converter valve are effective when the bypass switch is switched on by mistake in the normal operation process of the power module of the flexible direct current converter valve can be verified, so that the intrinsic safety problem of the power module can be solved, and the stability and the reliability of the power module can be improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a flexible dc converter valve power module bypass switch false-turn test provided in an embodiment of the present invention;
fig. 2 is a schematic flowchart of a test method for testing a bypass switch false turn-on of a power module of a flexible dc converter valve according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a flexible dc converter valve power module bypass switch false-positive test provided in another embodiment of the present invention;
fig. 4 is a schematic flowchart of a test method for testing the false closing of the bypass switch of the power module of the flexible dc converter valve according to another embodiment of the present invention;
fig. 5 is a circuit diagram of a flexible dc converter valve power module bypass switch false-positive test provided in accordance with another embodiment of the present invention;
fig. 6 is a circuit diagram of a flexible dc converter valve power module bypass switch false-positive test circuit according to still another embodiment of the present invention.
Detailed Description
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.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Example 1:
referring to fig. 1 and fig. 2, fig. 1 is a circuit diagram of a test for misclosing of a bypass switch of a power module of a flexible dc converter valve according to the present embodiment; fig. 2 is a circuit diagram of a test circuit for testing a bypass switch of a power module of a flexible direct-current converter valve by mistake, which is provided by the embodiment of the present invention, and the test method for testing the bypass switch of the power module of the flexible direct-current converter valve by mistake, which is provided by the embodiment of the present invention, is suitable for the test circuit for testing the bypass switch of the power module of the flexible direct-current converter valve shown in fig. 1, and includes:
s1, when testing the first insulated gate bipolar transistor T1, sending a turn-on command to the first insulated gate bipolar transistor T1 through the main controller, enabling current to flow from the first insulated gate bipolar transistor to a load reactance X, and generating load current at two ends of the load reactance X;
s2, when the first IGBT T1 is detected to be through-current, a trigger signal is sent through the bypass switch switching-on controller to simulate and trigger the first bypass switch S1 to be switched on by mistake;
s3, when the power module controller detects the trigger signal, starting protection, turning off the first igbt T1 to prevent the first igbt T1 and the first bypass switch S1 from generating a through short;
wherein, flexible direct current converter valve power module bypass switch mistake closes test circuit includes: a module under test 1 and the load reactance X; the module under test 1 includes: a first capacitor C1, a first resistor R1, the first insulated gate bipolar transistor T1, a second insulated gate bipolar transistor T2, a first diode D1, a first diode D2, and the first bypass switch S1; the first capacitor C1 is connected in parallel with the first resistor R1, the emitter of the first insulated-gate bipolar transistor T1 is connected to the collector of the second insulated-gate bipolar transistor T2, the collector of the first insulated-gate bipolar transistor T1 is connected to one end of the first resistor R1, the emitter of the second insulated-gate bipolar transistor T2 is connected to the other end of the first resistor R1, the anode of the first diode D1 is connected to the emitter of the first insulated-gate bipolar transistor T1, the cathode of the first diode D1 is connected to the collector of the first insulated-gate bipolar transistor T1, the anode of the first diode D2 is connected to the emitter of the second insulated-gate bipolar transistor T2, and the cathode of the first diode D2 is connected to the collector of the second insulated-gate bipolar transistor T2; the first bypass switch S1 is connected in parallel with the first diode D2, one end of the load reactance X is connected with one end of the first bypass switch S1, and the other end of the load reactance X is connected with the other end of the first bypass switch S1.
In the embodiment of the present invention, in step S1, it should be understood that after the first igbt T1 is turned on, because there is a load reactance in the circuit, the dc voltage across the capacitor will generate a load current across the load reactance, and the current direction is from the first igbt T1 to the load reactance.
Referring to fig. 3 and 4, in a preferred embodiment, the method for testing the misclosing of the bypass switch of the flexible dc converter valve power module further includes:
s21, when testing the first diode D1, sending a preset-duration turn-on command to the second igbt T2 and the third igbt T3 through the main controller, so that current flows from the third igbt to the load reactance and the second igbt in sequence, and the load reactance X generates a load current;
s22, when the load current reaches a set current, locking the second igbt T2, turning on the first igbt T1, and commutating the load current to a loop formed by the third igbt T3 and the first diode D1;
s23, when the first diode is detected to be through-current, a second trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake S1;
s24, when the power module controller detects the second trigger signal, enabling protection, and blocking the first and second insulated-gate bipolar transistors T1 and T2 to prevent the first diode D1 from generating a through short with the first bypass switch S1;
wherein the test circuit for testing the misclosing of the bypass switch of the power module of the flexible direct current converter valve also comprises an accompanying test module,
the test assistant module comprises a second capacitor C2, a second resistor R2, a third insulated gate bipolar transistor T3, a fourth insulated gate bipolar transistor T4, a third diode D3, a fourth diode D4 and a second bypass switch S2; an emitter of the third insulated-gate bipolar transistor T3 is connected to a collector of the fourth insulated-gate bipolar transistor T4, an anode of the third diode D3 is connected to an emitter of the third insulated-gate bipolar transistor T3, a cathode of the third diode D3 is connected to a collector of the third insulated-gate bipolar transistor T3, an anode of the fourth diode D4 is connected to an emitter of the fourth insulated-gate bipolar transistor T4, and a cathode of the fourth diode D4 is connected to a collector of the fourth insulated-gate bipolar transistor T4; a collector of the third insulated gate bipolar transistor T3 is connected to one end of the second resistor R2, an emitter of the fourth insulated gate bipolar transistor T4 is connected to the other end of the second resistor R2, and the second capacitor C2 is connected in parallel to the second resistor R2;
when the flexible direct current converter valve power module bypass switch mismatching test circuit further comprises an auxiliary test module, the other end of the load reactance X is connected with the other end of the first bypass switch S1 through a second bypass switch S2; the other end of the load reactance X is further connected to a collector of the fourth igbt T4, one end of the second bypass switch S2 connected to the first bypass switch S1 is further connected to an emitter of the fourth igbt T4, and a cathode of the first diode D1 is further connected to a collector of the third igbt T3.
Referring to fig. 3, in a second aspect, an embodiment of the present invention provides a flexible dc converter valve power module bypass switch mis-on test circuit, which is suitable for the flexible dc converter valve power module bypass switch mis-on test method, and includes: the device comprises a tested module 1, an accompanying module 2 and a load reactance X;
the module under test includes: a first capacitor C1, a first resistor R1, a first insulated gate bipolar transistor T1, a second insulated gate bipolar transistor T2, a first diode D1, a first diode D2, and a first bypass switch S1; the first capacitor C1 is connected in parallel with the first resistor R1, the emitter of the first insulated-gate bipolar transistor T1 is connected to the collector of the second insulated-gate bipolar transistor T2, the collector of the first insulated-gate bipolar transistor T1 is connected to one end of the first resistor R1, the emitter of the second insulated-gate bipolar transistor T2 is connected to the other end of the first resistor R1, the anode of the first diode D1 is connected to the emitter of the first insulated-gate bipolar transistor T1, the cathode of the first diode D1 is connected to the collector of the first insulated-gate bipolar transistor T1, the anode of the first diode D2 is connected to the emitter of the second insulated-gate bipolar transistor T2, and the cathode of the first diode D2 is connected to the collector of the second insulated-gate bipolar transistor T2; the first bypass is connected in parallel with the first diode D2;
the test assistant module comprises a second capacitor C2, a second resistor R2, a third insulated gate bipolar transistor T3, a fourth insulated gate bipolar transistor T4, a third diode D3, a fourth diode D4 and a second bypass switch S2; an emitter of the third insulated-gate bipolar transistor T3 is connected to a collector of the fourth insulated-gate bipolar transistor T4, an anode of the third diode D3 is connected to an emitter of the third insulated-gate bipolar transistor T3, a cathode of the third diode D3 is connected to a collector of the third insulated-gate bipolar transistor T3, an anode of the fourth diode D4 is connected to an emitter of the fourth insulated-gate bipolar transistor T4, and a cathode of the fourth diode D4 is connected to a collector of the fourth insulated-gate bipolar transistor T4; a collector of the third insulated gate bipolar transistor T3 is connected to one end of the second resistor R2, an emitter of the fourth insulated gate bipolar transistor T4 is connected to the other end of the second resistor R2, and the second capacitor C2 is connected in parallel to the second resistor R2;
one end of the first bypass switch S1 is further connected to one end of a load reactance X, the other end of the first bypass switch S1 is further connected to one end of the second bypass switch S2, the other end of the second bypass switch S2 is connected to the other end of the load reactance X, the other end of the load reactance X is further connected to the collector of the fourth igbt T4, one end of the second bypass switch S2 is further connected to the emitter of the fourth igbt T4, and the cathode of the first diode D1 is further connected to the collector of the third igbt T3.
Referring to fig. 5, in a preferred embodiment, the circuit for testing the misclosing of the bypass switch of the flexible dc converter valve power module further includes:
a control system comprising a main controller 3, a power module controller (not shown in the figure) and a bypass switch-on controller 4; the tested module 1 and the accompanying module 2 are respectively connected with the main controller 3, the bypass switch-on controller 4 is connected with the tested module 1, and the power module controller is connected with the tested module.
In the embodiment of the invention, the tested module 1 and the test accompanying module 2 are respectively connected with the main controller 3 through optical fibers, the bypass switch-on controller 4 is connected with the tested module 1 through optical fibers,
referring to fig. 6, in an embodiment of the invention, the flexible dc converter valve power module bypass switch false-turn-on test circuit further includes an ac power supply 5, a controllable voltage regulator 6, a high-voltage rectifier bridge 7, a dc voltage discharge loop 8, and a water cooling system 9; alternating current power supply 5 with controllable voltage regulator 6 is connected, controllable voltage regulator 6 with high-voltage rectifier bridge 7 is connected, high-voltage rectifier bridge 7 with direct voltage discharge return circuit 8 is connected, direct voltage discharge return circuit 8 with be connected by examination module 1, water cooling system 9 still with accompany examination module 1 and connect.
The alternating current power supply is 380V alternating current power supply, and the water cooling system is connected with the tested module and the accompanying module in a water way.
The method for testing the error connection of the bypass switch of the power module of the flexible direct current converter valve, which is provided by the embodiment of the invention, is suitable for a test circuit for the error connection of the bypass switch of the power module of the flexible direct current converter valve, and comprises the following steps: when a first insulated gate bipolar transistor is tested, a main controller sends a switching-on instruction to the first insulated gate bipolar transistor, so that current flows from the first insulated gate bipolar transistor to a load reactance, and load current is generated at two ends of the load reactance; when the first insulated gate bipolar transistor is detected to be through-current, a trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake; when the power module controller detects the trigger signal, starting protection, and turning off the first insulated gate bipolar transistor to prevent the first insulated gate bipolar transistor and the first bypass switch from generating a through short circuit; wherein, flexible direct current converter valve power module bypass switch mistake closes test circuit includes: a module under test and the load reactance; the module under test includes: the first capacitor, the first resistor, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the first diode, the second diode and the first bypass switch; the first capacitor is connected in parallel with the first resistor, the emitter of the first insulated gate bipolar transistor is connected with the collector of the second insulated gate bipolar transistor, the collector of the first insulated gate bipolar transistor is connected with one end of the first resistor, the emitter of the second insulated gate bipolar transistor is connected with the other end of the first resistor, the anode of the first diode is connected with the emitter of the first insulated gate bipolar transistor, the cathode of the first diode is connected with the collector of the first insulated gate bipolar transistor, the anode of the second diode is connected with the emitter of the second insulated gate bipolar transistor, and the cathode of the second diode is connected with the collector of the second insulated gate bipolar transistor; the first bypass switch is connected in parallel with the second diode, one end of the load reactance is connected with one end of the first bypass switch, and the other end of the load reactance is connected with the other end of the first bypass switch. By implementing the embodiment of the invention, whether the protection measures of the power module of the flexible direct current converter valve are effective when the bypass switch is switched on by mistake in the normal operation process of the power module of the flexible direct current converter valve can be verified, so that the intrinsic safety problem of the power module can be solved, and the stability and the reliability of the power module can be improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. The utility model provides a test method is closed by mistake to flexible direct current converter valve power module bypass switch, is applicable to flexible direct current converter valve power module bypass switch test circuit that closes by mistake, its characterized in that, flexible direct current converter valve power module bypass switch test circuit that closes by mistake includes:
accompany the examination module, accompany the examination module and include: the first capacitor, the first resistor, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third diode, the fourth diode and the first bypass switch; an emitter of the third insulated gate bipolar transistor is connected to a collector of the fourth insulated gate bipolar transistor, an anode of the third diode is connected to the emitter of the third insulated gate bipolar transistor, a cathode of the third diode is connected to the collector of the third insulated gate bipolar transistor, an anode of the fourth diode is connected to the emitter of the fourth insulated gate bipolar transistor, and a cathode of the fourth diode is connected to the collector of the fourth insulated gate bipolar transistor; a collector of the third insulated gate bipolar transistor is connected with one end of the second resistor, an emitter of the fourth insulated gate bipolar transistor is connected with the other end of the second resistor, and the second capacitor is connected with the second resistor in parallel;
the test method for the error closing of the bypass switch of the power module of the flexible direct current converter valve comprises the following steps:
when a first insulated gate bipolar transistor is tested, a main controller sends a switching-on instruction to the first insulated gate bipolar transistor, so that current flows from the first insulated gate bipolar transistor to a load reactance, and load current is generated at two ends of the load reactance;
when the first insulated gate bipolar transistor is detected to be through-current, a trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake;
when the power module controller detects the trigger signal, starting protection, and turning off the first insulated gate bipolar transistor to prevent the first insulated gate bipolar transistor and the first bypass switch from generating a through short circuit;
wherein, flexible direct current converter valve power module bypass switch mistake closes test circuit includes: a module under test and the load reactance; the module under test includes: the first capacitor, the first resistor, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the first diode, the second diode and the first bypass switch; the first capacitor is connected in parallel with the first resistor, the emitter of the first insulated gate bipolar transistor is connected with the collector of the second insulated gate bipolar transistor, the collector of the first insulated gate bipolar transistor is connected with one end of the first resistor, the emitter of the second insulated gate bipolar transistor is connected with the other end of the first resistor, the anode of the first diode is connected with the emitter of the first insulated gate bipolar transistor, the cathode of the first diode is connected with the collector of the first insulated gate bipolar transistor, the anode of the second diode is connected with the emitter of the second insulated gate bipolar transistor, and the cathode of the second diode is connected with the collector of the second insulated gate bipolar transistor; the first bypass switch is connected in parallel with the second diode, one end of the load reactance is connected with one end of the first bypass switch, and the other end of the load reactance is connected with the other end of the second bypass switch;
the other end of the load reactance is connected with the other end of the first bypass switch through a second bypass switch; the other end of the load reactance is further connected with the collector of the fourth insulated gate bipolar transistor, one end of the second bypass switch, which is connected with the first bypass switch, is further connected with the emitter of the fourth insulated gate bipolar transistor, and the cathode of the first diode is further connected with the collector of the third insulated gate bipolar transistor.
2. The method for testing the misclosing of the bypass switch of the flexible direct current converter valve power module according to claim 1, wherein the method for testing the misclosing of the bypass switch of the flexible direct current converter valve power module further comprises:
when the first diode is tested, sending a preset-duration turn-on command to the second insulated gate bipolar transistor and the third insulated gate bipolar transistor through the main controller, so that current flows from the third insulated gate bipolar transistor to the load reactance and the second insulated gate bipolar transistor in sequence, and the load reactance generates load current;
when the load current reaches a set current, the second insulated gate bipolar transistor is locked, the first insulated gate bipolar transistor is switched on, and the load current is converted into a loop formed by a third insulated gate bipolar transistor and a first diode;
when the first diode is detected to be through-flowing, a second trigger signal is sent by the bypass switch switching-on controller to simulate and trigger the first bypass switch to be switched on by mistake;
when the power module controller detects the second trigger signal, protection is started, and the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are locked to prevent the first diode and the first bypass switch from generating a through short circuit.
3. A test circuit for testing the misclosing of the bypass switch of the power module of the flexible direct-current converter valve is suitable for the test method for testing the misclosing of the bypass switch of the power module of the flexible direct-current converter valve as claimed in claim 2.
4. The flexible direct current converter valve power module bypass switch mis-closing test circuit as recited in claim 3, wherein the flexible direct current converter valve power module bypass switch mis-closing test circuit further comprises:
a control system comprising a main controller, a power module controller and a bypass switch-on controller;
the tested module and the accompanying module are respectively connected with the main controller, the bypass switch-on controller is connected with the tested module, and the power module controller is connected with the tested module.
5. The flexible direct current converter valve power module bypass switch mis-switching test circuit as claimed in claim 4, wherein the flexible direct current converter valve power module bypass switch mis-switching test circuit further comprises an alternating current power supply, a controllable voltage regulator, a high voltage rectifier bridge, a direct current voltage discharge loop and a water cooling system; alternating current power supply with controllable voltage regulator connects, controllable voltage regulator with the high-pressure rectifier bridge is connected, the high-pressure rectifier bridge with direct voltage discharge circuit connects, direct voltage discharge circuit with by the test module connection, water cooling system still with accompany the test module connection.
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