Converter large current test device

Abstract

The utility model discloses a converter large-current test device, which comprises a large-current generation unit, a large-current switch unit, a diode unit, a protection switch unit and a tested product, the large current generating unit comprises a first large current generating device, a second large current generating device and a third large current generating device; a first port of the first large current generating device is connected with a first port of the second large current generating device and a first port of the third large current generating device; a second port of the first large current generating device is connected with the input end of the large current switch unit, the input end and the output end of the diode unit are connected with the common cathode end A and the common anode end K of a tested product, and the middle end of the diode unit is connected with the input end of the large current switch unit through the protection switch unit; the device can simulate the large current flowing into the converter, the large current endurance capability of the converter can be tested, and the electric shock risk possibly caused by the abnormity of the test device can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of converter high current testing, in particular to a converter high current testing device. Background Art

[0002] The converters in the prior art mostly focus on limiting the short-circuit current peak when the DC bus is short-circuited or the module is short-circuited, detecting abnormally large currents, and protecting logic and configuration, but rarely involve simulation of abnormally large currents.

[0003] In actual applications, when the positive and negative DC busbars of the doubly-fed converter are short-circuited, or one side of the busbar is short-circuited to the ground, it takes a certain amount of time from the detection of abnormally large current to the complete disconnection of the grid-connected switch or grid-connected contactor. During this period, a large current will pass through the machine-side module of the converter, which poses a risk of failure. On the other hand, during the low-voltage ride-through process of the doubly-fed converter, an abnormally large current will also pass through the machine-side module of the converter, which also poses a risk of module failure. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a converter high current test device, which can simulate the high current flowing into the converter, can test the converter's high current tolerance capacity, and can avoid the risk of electric shock caused by abnormality of the test device.

[0005] In order to solve the above technical problems, the utility model provides a converter high current test device. It includes a high current generating unit, a high current switch unit, a diode unit, a protection switch unit, and a tested product; the high current generating unit includes a first high current generating device, a second high current generating device, and a third high current generating device; the first port of the first high current generating device is connected to the first port of the second high current generating device and the first port of the third high current generating device;

[0006] The second port of the first large current generating device is connected to the input end of the large current switching unit, and the tested product includes a common cathode terminal A, a common anode terminal K, a first AC port a, a second AC port b, and a third AC port c; the output end of the large current switching unit is connected to the first AC port a, the second AC port b, and the third AC port c of the tested product; the input end and the output end of the diode unit are connected to the common cathode terminal A and the common anode terminal K of the tested product, and the middle end of the diode unit is connected to the input end of the large current switching unit through the protection switch unit.

[0007] Preferably, the first large current generating device comprises a capacitor C1, an inductor L1, and a resistor R1; the second large current generating device comprises a capacitor C2, an inductor L2, and a resistor R2; the third large current generating device comprises a capacitor C3, an inductor L3, and a resistor R3, the first port of the capacitor C1 is connected to the second port of the inductor L1, and the second port is connected to the first port of the resistor R1; the first port of the capacitor C2 is connected to the second port of the inductor L2, and the second port is connected to the first port of the resistor R2; the first port of the capacitor C3 is connected to the second port of the inductor L3, and the second port is connected to the first port of the resistor R3; the first port of the inductor L1 is connected to the first port of the first large current generating device; the first port of the inductor L2 is connected to the first port of the second large current generating device; the first port of the inductor L3 is connected to the first port of the third large current generating device; the second port of the resistor R1 is connected to the second port of the first large current generating device; the second port of the resistor R2 is connected to the second port of the second large current generating device; the second port of the resistor R3 is connected to the second port of the third large current generating device.

[0008] Preferably, the high-current switch unit includes a first high-current switch unit, a second high-current switch unit, and a third high-current switch unit.

[0009] The first large current switch unit includes a group of controllable bidirectionally conductive thyristor components SCR1; the second large current switch unit includes a group of controllable bidirectionally conductive thyristor components SCR2; and the third large current switch unit includes a group of controllable bidirectionally conductive thyristor components SCR3.

[0010] The first port of the group of controllable bidirectionally conductive thyristor components SCR1 is connected to the second port of the first large current generating device; the first port of the group of controllable bidirectionally conductive thyristor components SCR2 is connected to the second port of the second large current generating device; the first port of the group of controllable bidirectionally conductive thyristor components SCR3 is connected to the second port of the third large current generating device.

[0011] Preferably, the protection switch unit includes a first protection switch unit, a second protection switch unit and a third protection switch unit;

[0012] The first protection switch unit includes a group of controllable bidirectionally conductive thyristor components SCR4; the second protection switch unit includes a group of controllable bidirectionally conductive thyristor components SCR5; the third protection switch unit includes a group of controllable bidirectionally conductive thyristor components SCR6;

[0013] The first port of the group of controllable bidirectionally conductive thyristor components SCR4 is connected to the first port of the first large current switch unit, and the second port is connected to the middle end of the diode unit; the first port of the group of controllable bidirectionally conductive thyristor components SCR5 is connected to the first port of the second large current switch unit, and the second port is connected to the middle end of the diode unit; the first port of the group of controllable bidirectionally conductive thyristor components SCR6 is connected to the first port of the third large current switch unit, and the second port is connected to the middle end of the diode unit.

[0014] Preferably, the diode unit comprises a first diode and a second diode;

[0015] The second port of the first diode is connected to the first port of the second diode; the second port of the first diode is connected to the first port of the first high-current switch unit through the protection switch unit; the second port of the first diode is connected to the first port of the second high-current switch unit through the protection switch unit; the second port of the first diode is connected to the first port of the third high-current switch unit through the protection switch unit.

[0016] Preferably, the tested product includes a three-phase rectifier bridge or a three-phase rectifier device with anti-parallel diodes or a three-phase inverter device with anti-parallel diodes;

[0017] The common cathode terminal A is connected to the second port of the second diode; the common anode terminal K is connected to the first port of the first diode; the first AC port a is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR1; the second AC port b is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR2; the third AC port c is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR3; the common cathode terminal A is directly connected to the common anode terminal K.

[0018] After adopting the above device, the converter high current test device includes a high current generating unit, a high current switch unit, a diode unit, a protection switch unit, and a tested product; the high current generating unit includes a first high current generating device, a second high current generating device, and a third high current generating device; the first port of the first high current generating device is connected to the first port of the second high current generating device and the first port of the third high current generating device; the second port of the first high current generating device is connected to the input end of the high current switch unit, and the tested product includes a common cathode terminal A, a common anode terminal K, a first AC terminal K, and a second high current generating device. The high current switch unit has a first AC port a, a second AC port b, and a third AC port c; the output end of the high current switch unit is connected to the first AC port a, the second AC port b and the third AC port c of the product under test; the input end and the output end of the diode unit are connected to the common cathode terminal A and the common anode terminal K of the product under test, and the middle end of the diode unit is connected to the input end of the high current switch unit through the protection switch unit; the converter high current test device can simulate the high current flowing into the converter, can test the high current tolerance capacity of the converter, and can avoid the risk of electric shock caused by abnormality of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is an overall circuit diagram of a converter high current test device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in combination with the overall implementation scheme, examples and drawings. It should be understood that the overall implementation scheme and specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0021] The implementation of the present utility model is described in detail below in conjunction with the overall implementation scheme.

[0022] Embodiment 1

[0023] See also Figure 1 , Figure 1 It is an overall circuit diagram of a converter high current test device;

[0024] The present embodiment discloses a converter high current test device, comprising a high current generating unit 10, a high current switch unit 20, a diode unit 40, a protection switch unit 30, and a tested product 50; the high current generating unit comprises a first high current generating device, a second high current generating device, and a third high current generating device; the first port of the first high current generating device is connected to the first port of the second high current generating device and the first port of the third high current generating device;

[0025] The second port of the first large current generating device is connected to the input end of the large current switching unit, and the tested product 50 includes a common cathode terminal A, a common anode terminal K, a first AC port a, a second AC port b, and a third AC port c; the output end of the large current switching unit is connected to the first AC port a, the second AC port b, and the third AC port c of the tested product; the input end and the output end of the diode unit are connected to the common cathode terminal A and the common anode terminal K of the tested product, and the middle end of the diode unit is connected to the input end of the large current switching unit through the protection switch unit.

[0026] Embodiment 2

[0027] This embodiment is based on the first embodiment. In this embodiment, the first large current generating device includes a capacitor C1, an inductor L1, and a resistor R1; the second large current generating device includes a capacitor C2, an inductor L2, and a resistor R2; the third large current generating device includes a capacitor C3, an inductor L3, and a resistor R3. The first port of the capacitor C1 is connected to the second port of the inductor L1, and the second port is connected to the first port of the resistor R1; the first port of the capacitor C2 is connected to the second port of the inductor L2, and the second port is connected to the first port of the resistor R2; the first port of the capacitor C3 is connected to the second port of the inductor L3, and the second port is connected to the first port of the resistor R2; The second port is connected to the first port of the resistor R3; the first port of the inductor L1 is connected to the first port of the first large current generating device; the first port of the inductor L2 is connected to the first port of the second large current generating device; the first port of the inductor L3 is connected to the first port of the third large current generating device; the second port of the resistor R1 is connected to the second port of the first large current generating device; the second port of the resistor R2 is connected to the second port of the second large current generating device; the second port of the resistor R3 is connected to the second port of the third large current generating device.

[0028] Embodiment 3

[0029] This embodiment is based on the first embodiment. In this embodiment, the high current switch unit 20 includes a first high current switch sub-unit, a second high current switch sub-unit, and a third high current switch sub-unit.

[0030] The first high current switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR1; the second high current switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR2; and the third high current switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR3.

[0031] The first port of the group of controllable bidirectionally conductive thyristor components SCR1 is connected to the second port of the first large current generating device; the first port of the group of controllable bidirectionally conductive thyristor components SCR2 is connected to the second port of the second large current generating device; the first port of the group of controllable bidirectionally conductive thyristor components SCR3 is connected to the second port of the third large current generating device.

[0032] Embodiment 4

[0033] This embodiment is based on the third embodiment. In this embodiment, the protection switch unit 30 includes a first protection switch sub-unit, a second protection switch sub-unit and a third protection switch sub-unit;

[0034] The first protection switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR4; the second protection switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR5; the third protection switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR6;

[0035] The first port of the group of controllable bidirectionally conductive thyristor components SCR4 is connected to the first port of the first large current switch subunit, and the second port is connected to the middle end of the diode unit 40; the first port of the group of controllable bidirectionally conductive thyristor components SCR5 is connected to the first port of the second large current switch subunit, and the second port is connected to the middle end of the diode unit 40; the first port of the group of controllable bidirectionally conductive thyristor components SCR6 is connected to the first port of the third large current switch subunit, and the second port is connected to the middle end of the diode unit 40;

[0036] In this embodiment, the diode unit 40 includes a first diode and a second diode;

[0037] The second port of the first diode is connected to the first port of the second diode; the second port of the first diode is connected to the first port of the first high-current switch subunit through the protection switch unit 30; the second port of the first diode is connected to the first port of the second high-current switch subunit through the protection switch unit 30; the second port of the first diode is connected to the first port of the third high-current switch subunit through the protection switch unit 30.

[0038] The tested product includes a three-phase rectifier bridge or a three-phase rectifier device with anti-parallel diodes or a three-phase inverter device with anti-parallel diodes;

[0039] The common cathode terminal A is connected to the second port of the second diode; the common anode terminal K is connected to the first port of the first diode; the first AC port a is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR1; the second AC port b is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR2; the third AC port c is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR3; the common cathode terminal A is directly connected to the common anode terminal K.

[0040] In this embodiment, each of the three groups of large current generating devices is independent of each other, and the frequency and peak value of the current can be flexibly adjusted according to the test requirements;

[0041] Each group of large current generating devices is composed of an inductor L, a capacitor C, and a resistor R, wherein the resistor R can be the parasitic resistance of the entire loop or a specially configured resistor, and its main function is to assist in regulating the peak value of the current; the size of the inductor L and the capacitor C affects the frequency of the current, and different configurations can generate AC currents of different frequencies; the capacitor C needs to be pre-charged, and the level of the charging voltage directly affects the size of the AC current peak.

[0042] Therefore, by adjusting the inductor L, the capacitor C, the resistor R and controlling the charging voltage of the capacitor C, the peak value and the attenuation envelope of the AC current can be controlled so that the entire circuit outputs the expected AC current.

[0043] When the effect of resistance is ignored, the frequency of the current is determined by the following formula:

[0044]

[0045] When the test wiring is completed, the three high-current switch subunits SCR1, SCR2, and SCR3 can be closed, and the three-phase current will enter the tested product respectively to achieve the test purpose;

[0046] When the test is completed, it is recommended to close the three protection switch units SCR4, SCR5, and SCR6 to ensure that the charge on capacitor C is completely discharged.

[0047] The converter high current test device can simulate the high current flowing into the converter, can test the converter's high current tolerance capability, and can avoid the risk of electric shock caused by abnormality of the test device.

[0048] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the present application is not limited thereby. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application shall be within the scope of the present application.

Claims

1. A high current test device for a current transformer, characterized in that: It includes a large current generating unit, a large current switch unit, a diode unit, a protection switch unit, and a tested product; the large current generating unit includes a first large current generating device, a second large current generating device, and a third large current generating device; the first port of the first large current generating device is connected to the first port of the second large current generating device and the first port of the third large current generating device; The second port of the first large current generating device is connected to the input end of the large current switching unit, and the tested product includes a common cathode terminal A, a common anode terminal K, a first AC port a, a second AC port b, and a third AC port c; the output end of the large current switching unit is connected to the first AC port a, the second AC port b, and the third AC port c of the tested product; the input end and the output end of the diode unit are connected to the common cathode terminal A and the common anode terminal K of the tested product, and the middle end of the diode unit is connected to the input end of the large current switching unit through the protection switch unit.

2. The converter high current test device according to claim 1, characterized in that: The first large current generating device includes a capacitor C1, an inductor L1, and a resistor R1; the second large current generating device includes a capacitor C2, an inductor L2, and a resistor R2; the third large current generating device includes a capacitor C3, an inductor L3, and a resistor R3, the first port of the capacitor C1 is connected to the second port of the inductor L1, and the second port is connected to the first port of the resistor R1; the first port of the capacitor C2 is connected to the second port of the inductor L2, and the second port is connected to the first port of the resistor R2; the first port of the capacitor C3 is connected to the second port of the inductor L3, and the second port is connected to the first port of the resistor R3; the first port of the inductor L1 is connected to the first port of the first large current generating device; the first port of the inductor L2 is connected to the first port of the second large current generating device; the first port of the inductor L3 is connected to the first port of the third large current generating device; the second port of the resistor R1 is connected to the second port of the first large current generating device; the second port of the resistor R2 is connected to the second port of the second large current generating device; the second port of the resistor R3 is connected to the second port of the third large current generating device.

3. The converter high current test device according to claim 1, characterized in that: The high current switch unit includes a first high current switch unit, a second high current switch unit, and a third high current switch unit; The first large current switch unit includes a group of controllable bidirectionally conductive thyristor components SCR1; the second large current switch unit includes a group of controllable bidirectionally conductive thyristor components SCR2; the third large current switch unit includes a group of controllable bidirectionally conductive thyristor components SCR3; The first port of the group of controllable bidirectionally conductive thyristor components SCR1 is connected to the second port of the first large current generating device; the first port of the group of controllable bidirectionally conductive thyristor components SCR2 is connected to the second port of the second large current generating device; the first port of the group of controllable bidirectionally conductive thyristor components SCR3 is connected to the second port of the third large current generating device.

4. The converter high current test device according to claim 3, characterized in that: The protection switch unit includes a first protection switch sub-unit, a second protection switch sub-unit and a third protection switch sub-unit; The first protection switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR4; the second protection switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR5; the third protection switch subunit includes a group of controllable bidirectionally conductive thyristor components SCR6; The first port of the group of controllable bidirectionally conductive thyristor components SCR4 is connected to the first port of the first large current switch unit, and the second port is connected to the middle end of the diode unit; the first port of the group of controllable bidirectionally conductive thyristor components SCR5 is connected to the first port of the second large current switch unit, and the second port is connected to the middle end of the diode unit; the first port of the group of controllable bidirectionally conductive thyristor components SCR6 is connected to the first port of the third large current switch unit, and the second port is connected to the middle end of the diode unit.

5. The converter high current test device according to claim 4, characterized in that: The diode unit includes a first diode and a second diode; The second port of the first diode is connected to the first port of the second diode; the second port of the first diode is connected to the first port of the first high-current switch unit through the protection switch unit; the second port of the first diode is connected to the first port of the second high-current switch unit through the protection switch unit; the second port of the first diode is connected to the first port of the third high-current switch unit through the protection switch unit.

6. The converter high current test device according to claim 5, characterized in that: The tested product includes a three-phase rectifier bridge or a three-phase rectifier device with anti-parallel diodes or a three-phase inverter device with anti-parallel diodes; The common cathode terminal A is connected to the second port of the second diode; the common anode terminal K is connected to the first port of the first diode; the first AC port a is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR1; the second AC port b is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR2; the third AC port c is connected to the second port of the group of controllable bidirectionally conductive thyristor components SCR3; the common cathode terminal A is directly connected to the common anode terminal K.

Images