CN213023381U - Slope putting-in and putting-out test device for direct current energy consumption device - Google Patents
Slope putting-in and putting-out test device for direct current energy consumption device Download PDFInfo
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- CN213023381U CN213023381U CN202021662646.3U CN202021662646U CN213023381U CN 213023381 U CN213023381 U CN 213023381U CN 202021662646 U CN202021662646 U CN 202021662646U CN 213023381 U CN213023381 U CN 213023381U
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Abstract
A slope switching test device of a direct current energy consumption device comprises a high-voltage source, a current-limiting reactor Ls, a direct current capacitor CS, a thyristor T1, a thyristor T2, a current-limiting resistor R, an energy consumption resistor R1, a test article energy consumption component and a direct current voltage-stabilizing capacitor C. The device can enable the test article energy consumption assembly to be put into all the sub-modules one by one according to the slope strategy, and cut off all the sub-modules one by one according to the slope strategy after the voltage of the direct current bus is reduced to a set value, so that the test article energy consumption assembly can endure the voltage and current stress equivalent to the actual on-off working condition, the power impact of the switching process is reduced, the fluctuation of the direct current voltage is reduced, the test method is simple, flexible and convenient to operate, and the requirements of the slope on-off test of the direct current energy consumption device are met.
Description
Technical Field
The utility model relates to a flexible power transmission and distribution of electric power system, power electronics and user's electric power technical field, concretely relates to test device is thrown back in direct current power consumption device slope.
Background
With the development of high voltage direct current transmission systems, the importance of direct current energy consumption devices is more and more prominent. The direct current energy consumption device is mainly applied to an application scene of island power supply, if a power generation end is an inertial power supply similar to wind power, when a power receiving end breaks down, energy is accumulated on a direct current side due to the fact that power cannot be sent out, and voltage of a direct current transmission line is increased, and safety operation of equipment is damaged. The direct current energy consumption device is put into an energy consumption state when the residual power causes the direct current voltage to exceed the set voltage value after the alternating current fault occurs, and the residual power is released.
In the process of switching in and switching off the direct current energy consumption device, a scheme of instantly switching in or switching off all energy consumption device submodules is generally adopted, and larger voltage and current impact is generated on a direct current bus. For a control system, step response is easy to cause overshoot and oscillation of a control link, and the stability of the direct-current bus voltage of the system is seriously influenced.
In order to reduce power impact in the switching process and reduce fluctuation of direct current voltage, the state design of the valve component submodule in the device is changed according to the slope process. In view of the special application working condition of the direct current energy consumption device, the performance of the slope launching and retreating strategy is difficult to verify by building a load environment the same as the actual working condition. Therefore, an equivalent test platform needs to be constructed to verify the slope starting and stopping strategy of the energy consumption device, which is equivalent to the actual working condition.
SUMMERY OF THE UTILITY MODEL
In order to solve direct current power consumption device and throw the problem that moves back the performance verification difficulty under operating condition slope, the utility model provides a test device makes the sample power consumption subassembly drop into whole submodule pieces one by one according to the slope strategy to cut off whole power consumption subassembly submodule pieces one by one according to the slope strategy after direct current bus voltage drops to the setting value. The testing device is simple and flexible, is convenient to operate, and can meet the requirements of continuous current operation tests of the half-bridge sub-modules of the flexible direct-current transmission multilevel converter.
In order to achieve the above object, the utility model provides a test device is thrown back in direct current power consumption device slope, include: the device comprises a high-voltage source, a current-limiting reactor Ls, a direct-current capacitor CS, a thyristor T1, a thyristor T2, a current-limiting resistor R, an energy consumption resistor R1, a test article energy consumption component and a direct-current voltage-stabilizing capacitor C;
the input end of the high-voltage source is connected with a three-phase alternating-current power grid, the anode of an output direct-current bus is connected with the anode of a thyristor T1, the cathode of the thyristor T1 is connected in series with a current-limiting reactor Ls, the other end of the current-limiting reactor Ls is connected with the anode of a thyristor T2, and a direct-current capacitor Cs is connected in parallel between the anode of the thyristor T2 and the output negative bus of the high-voltage; the cathode of the thyristor T2 is connected in series to a current-limiting resistor R, and the other end of the current-limiting resistor R is connected with the anode of the input port of the test article energy consumption assembly and a direct-current voltage-stabilizing capacitor C; the test article energy consumption component is connected with an energy consumption resistor R1 in series, and the other end of the energy consumption resistor R1 is connected with a direct current voltage stabilizing capacitor C and the output negative electrode of a high-voltage source; and the direct current voltage-stabilizing capacitor C is connected between the positive bus and the negative bus in parallel.
Furthermore, the test article energy consumption assembly is formed by connecting N multi-level converter test article sub-modules in series, wherein N is an integer larger than 1.
Further, each sub-module includes a capacitor Csm, an IGBT device Tsm1, an IGBT device Tsm2, and a diode Dsm1, a diode Dsm 2; the positive electrode of the 1 st test sample sub-module is connected with a direct current positive bus; and the negative electrode of the Nth test sample sub-module is connected with an energy consumption resistor R1, and the other end of the energy consumption resistor R1 is connected with a direct-current negative bus.
Further, the IGBT device Tsm1 and the diode Dsm1 are connected in anti-parallel to form an IGBT/diode module 1, and the IGBT device Tsm2 and the diode Dsm2 are connected in anti-parallel to form an IGBT/diode module 2; the IGBT/diode modules 1 and 2 are connected in series in sequence and then connected in parallel with the sub-module capacitor Csm.
To sum up, the utility model provides a direct current power consumption device slope is thrown and is moved back test device, including high voltage source, current-limiting reactor Ls, direct current electric capacity CS, thyristor T1, thyristor T2, current-limiting resistor R, power consumption resistor R1, sample power consumption subassembly and direct current steady voltage electric capacity C, the device through set up one with the test platform of operating condition equivalence, adopt the device to realize throwing the verification of moving back the performance to direct current power consumption device slope, can satisfy the power consumption subassembly slope and drag the experimental requirement of moving back. In addition, the device only controls two IGBT devices of the sub-module of the test article energy consumption assembly, so that the sub-module can be switched conveniently according to a set strategy, and the device is simple, convenient and flexible to operate.
The utility model has the beneficial technical effects that:
the utility model provides a scheme can make the sample power consumption subassembly drop into whole submodule pieces one by one according to the slope strategy to excise whole submodule pieces one by one according to the slope strategy after direct current bus voltage descends to the setting value, make the sample power consumption subassembly tolerate and throw the voltage and the current stress that move back the operating mode and equate with the reality, reduce the power impact of switching process, reduce direct current voltage's fluctuation, and test method is simple nimble, convenient operation, satisfy direct current power consumption device slope and throw and move back experimental requirement.
Drawings
Fig. 1 is a schematic circuit diagram of a slope putting-in and putting-out test device of a dc energy consumption device according to an embodiment of the present invention;
fig. 2 is a simulation waveform of a slope putting-in and putting-out strategy test of the dc energy consumption device according to the embodiment of the present invention;
fig. 3 is a timing diagram of slope putting and putting of a slope putting and putting strategy test of the direct current energy consumption device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The utility model provides a test device is thrown to move back in direct current power consumption device slope, include: the device comprises a high-voltage source, a current-limiting reactor Ls, a direct-current capacitor CS, a thyristor T1, a thyristor T2, a current-limiting resistor R, an energy consumption resistor R1, a test article energy consumption component and a direct-current voltage-stabilizing capacitor C;
the input end of the high-voltage source is connected with a three-phase alternating-current power grid, the anode of an output direct-current bus is connected with the anode of a thyristor T1, the cathode of the thyristor T1 is connected in series with a current-limiting reactor Ls, the other end of the current-limiting reactor Ls is connected with the anode of a thyristor T2, and a direct-current capacitor Cs is connected in parallel between the anode of the thyristor T2 and the output negative bus of the high-voltage; the cathode of the thyristor T2 is connected in series to a current-limiting resistor R, and the other end of the current-limiting resistor R is connected with the anode of the input port of the test article energy consumption assembly and a direct-current voltage-stabilizing capacitor C; the test article energy consumption component is connected with an energy consumption resistor R1 in series, and the other end of the energy consumption resistor R1 is connected with a direct current voltage stabilizing capacitor C and the output negative electrode of a high-voltage source; and the direct current voltage-stabilizing capacitor C is connected between the positive bus and the negative bus in parallel.
Furthermore, the test article energy consumption assembly is formed by connecting N multi-level converter test article sub-modules in series, wherein N is an integer larger than 1.
Further, each sub-module includes a capacitor Csm, an IGBT device Tsm1, an IGBT device Tsm2, and a diode Dsm1, a diode Dsm 2; the positive electrode of the 1 st test sample sub-module is connected with a direct current positive bus; and the negative electrode of the Nth test sample sub-module is connected with an energy consumption resistor R1, and the other end of the energy consumption resistor R1 is connected with a direct-current negative bus.
Further, the IGBT device Tsm1 and the diode Dsm1 are connected in anti-parallel to form an IGBT/diode module 1, and the IGBT device Tsm2 and the diode Dsm2 are connected in anti-parallel to form an IGBT/diode module 2; the IGBT/diode modules 1 and 2 are connected in series in sequence and then connected in parallel with the sub-module capacitor Csm.
When the test starts, the high-voltage source charges the capacitors Cs and C and the test product energy consumption valve assembly, and the voltage of the direct-current bus is increased; when the voltage of the direct-current bus is increased to the input voltage value Uset1 of the energy consumption device, starting a slope input and exit strategy test, inputting all sub-modules of the energy consumption valve assembly of the test piece one by one within the time of a set strategy Ts1, and reducing the voltage of the direct-current bus; when the direct current bus is reduced to the exit voltage value Uset2 of the energy consumption device, cutting off all sub-modules of the energy consumption valve assembly of the test piece one by one within the time of a set strategy Ts2 to complete the slope putting-in and putting-out test of the energy consumption valve assembly of the test piece in one period; after the test article energy consumption valve assembly is withdrawn, the high-voltage source continues to charge the capacitors Cs and C and the test article energy consumption valve assembly, and a slope putting-in and withdrawing test of the test article energy consumption valve assembly in the next period is carried out; and issuing a discharge instruction until the test is finished, and discharging the energy of the capacitor C.
Specifically, the slope putting-in and putting-out test device of the direct current energy consumption device executes the following steps to perform a slope putting-in and putting-out test of the direct current energy consumption device:
A. the control background is used for setting the slope input time Ts1, the input voltage Uset1, the exit voltage Uset2 and the slope cutting time Ts2 of the energy consumption assembly;
B. starting a high-voltage source, enabling the high-voltage source to operate in an open loop mode, controlling a background to issue a charging instruction, and charging capacitors CS and C;
C. when the direct current bus voltage reaches Uset1, the system has test conditions; the control background issues a slope switching-in/out test instruction, the energy consumption assemblies Ts1 are switched into all the submodules one by one, the voltage of the direct-current bus is reduced, and the current of the energy consumption valve is increased;
D. when the voltage of the direct-current bus is reduced to Uset2, all the submodules are cut off one by one in the time of the energy consumption assembly Ts2, the current of the energy consumption valve is reduced, and a slope switching-on and switching-off test of one period is completed;
E. and starting a high-voltage source, charging the capacitors CS and C and the energy consumption valve, carrying out a slope on-off test of the next period until the test is finished, and issuing a capacitor C discharge instruction by a background to discharge capacitor C energy.
In the step A, a background is controlled to set a slope input time Ts1 to be less than or equal to 2.5ms, and an energy consumption device input voltage Uset1 is 1.12 pu; the exit voltage Uset2 of the energy consumption device is 1.02pu, and the slope exit time Ts2 is less than or equal to 2 ms.
In the step B, after the background issues the charging dc, the high-voltage source outputs a stable dc voltage, and simultaneously triggers the thyristors T1 and T3 to charge the dc capacitors Cs and C and the energy consumption valve assembly.
In the step C, after the capacitor voltage is charged to Uset1, the charging is stopped, and the system has the test condition.
In the step C, after the system has the test condition, a slope input instruction is issued by a background, and all the submodules finish inputting within Ts1 time.
In the step D, the voltage of the direct current bus is reduced to Uset2 through the voltage of the energy consumption assembly, a slope cutting instruction is issued in a background, and all the sub-modules are cut within the time Ts 2.
In the step E, after the test is finished, a background issues a capacitor discharging instruction to finish discharging of the capacitor C; the trigger pulses of the IGBT devices Tsm1 and Tsm2 are latched, and the energy in the sub-module capacitor Csm is released.
The simulation waveform of the slope putting-in and putting-out strategy test of the direct current energy consumption device is given as shown in fig. 2. The waveform comprises direct current bus voltage, direct current bus current, submodule voltage and submodule input quantity.
Fig. 3 shows a timing chart of the slope switching strategy test of the dc energy consumption device.
To sum up, the utility model provides a direct current power consumption device slope is thrown and is moved back test device, including high voltage source, current-limiting reactor Ls, direct current electric capacity CS, thyristor T1, thyristor T2, current-limiting resistor R, power consumption resistor R1, sample power consumption subassembly and direct current steady voltage electric capacity C, the device through set up one with the test platform of operating condition equivalence, adopt the device to realize throwing the verification of moving back the performance to direct current power consumption device slope, can satisfy the power consumption subassembly slope and drag the experimental requirement of moving back. In addition, the device only controls two IGBT devices of the sub-module of the test article energy consumption assembly, so that the sub-module can be switched conveniently according to a set strategy, and the device is simple, convenient and flexible to operate. The utility model provides a scheme can make the sample power consumption subassembly drop into whole submodule pieces one by one according to the slope strategy to excise whole submodule pieces one by one according to the slope strategy after direct current bus voltage descends to the setting value, make the sample power consumption subassembly tolerate and throw the voltage and the current stress that move back the operating mode and equate with the reality, reduce the power impact of switching process, reduce direct current voltage's fluctuation, and test method is simple nimble, convenient operation, satisfy direct current power consumption device slope and throw and move back experimental requirement.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (4)
1. The utility model provides a test device is moved back in slope of direct current power consumption device which characterized in that includes: the device comprises a high-voltage source, a current-limiting reactor Ls, a direct-current capacitor CS, a thyristor T1, a thyristor T2, a current-limiting resistor R, an energy consumption resistor R1, a test article energy consumption component and a direct-current voltage-stabilizing capacitor C;
the input end of the high-voltage source is connected with a three-phase alternating-current power grid, the anode of an output direct-current bus is connected with the anode of a thyristor T1, the cathode of the thyristor T1 is connected in series with a current-limiting reactor Ls, the other end of the current-limiting reactor Ls is connected with the anode of a thyristor T2, and a direct-current capacitor Cs is connected in parallel between the anode of the thyristor T2 and the output negative bus of the high-voltage; the cathode of the thyristor T2 is connected in series to a current-limiting resistor R, and the other end of the current-limiting resistor R is connected with the anode of the input port of the test article energy consumption assembly and a direct-current voltage-stabilizing capacitor C; the test article energy consumption component is connected with an energy consumption resistor R1 in series, and the other end of the energy consumption resistor R1 is connected with a direct current voltage stabilizing capacitor C and the output negative electrode of a high-voltage source; and the direct current voltage-stabilizing capacitor C is connected between the positive bus and the negative bus in parallel.
2. The device for testing the slope drop-off of the direct current energy consuming device according to claim 1, wherein the test article energy consuming assembly is formed by connecting N multi-level converter test article sub-modules in series, and N is an integer greater than 1.
3. The slope putting-back test device for the direct current energy consumption device according to claim 1 or 2, wherein each submodule comprises a capacitor Csm, an IGBT device Tsm1, an IGBT device Tsm2, a diode Dsm1 and a diode Dsm 2; the positive electrode of the 1 st test sample sub-module is connected with a direct current positive bus; and the negative electrode of the Nth test sample sub-module is connected with an energy consumption resistor R1, and the other end of the energy consumption resistor R1 is connected with a direct-current negative bus.
4. The slope putting-in and putting-out test device of the direct current energy consumption device as claimed in claim 3, wherein the IGBT device Tsm1 and the diode Dsm1 are connected in anti-parallel to form an IGBT/diode module 1, and the IGBT device Tsm2 and the diode Dsm2 are connected in anti-parallel to form an IGBT/diode module 2; the IGBT/diode modules 1 and 2 are connected in series in sequence and then connected in parallel with the sub-module capacitor Csm.
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| CN202021662646.3U CN213023381U (en) | 2020-08-10 | 2020-08-10 | Slope putting-in and putting-out test device for direct current energy consumption device |
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| CN202021662646.3U CN213023381U (en) | 2020-08-10 | 2020-08-10 | Slope putting-in and putting-out test device for direct current energy consumption device |
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