CN107765112B - Converter valve overcurrent turn-off test circuit, method and device - Google Patents
Converter valve overcurrent turn-off test circuit, method and device Download PDFInfo
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Abstract
The invention provides a converter valve overcurrent turn-off test circuit, a method and a device, wherein the circuit comprises: the device comprises a power supply, an auxiliary valve, a test sample valve, a load reactor, a current limiting reactor and a thyristor valve; the auxiliary valve is formed by connecting m MMC sub-modules in series, the test sample valve is formed by connecting n MMC sub-modules in series, the load reactor is connected between the auxiliary valve and the test sample valve, the current-limiting reactor is connected with the thyristor valve in parallel after being connected in series, the anode of the thyristor valve is connected with the current-limiting reactor, the cathode of the thyristor valve is connected with the cathode of the test sample valve, the output end of the power supply is provided with m pairs of independent output ports, and the m pairs of output ports are connected with each MMC sub-module capacitor of the auxiliary valve to charge the auxiliary valve. The problem of in the prior art carry out the overcurrent shutoff test to the converter valve in the process, can not reach the steady-state junction temperature of IGBT through the water temperature heating mode or when forming the overcurrent through the short-circuit current branch road that increases, need dispose different reactor parameters is solved.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission of a power system, in particular to a converter valve overcurrent turn-off test circuit, a method and a device.
Background
Flexible high Voltage direct current transmission technology (VSC-HVDC) Based on Modular Multilevel Converters (MMC), the application in power systems is more and more extensive, and the structure of a transmission network is significantly changed, and the performance of the network is improved. With the continuous improvement of the voltage class and the transmission capacity of the MMC-HVDC system, higher requirements are put on the reliability of a key device, namely an MMC valve, and particularly higher requirements are put on the capability of bearing various extreme currents, voltages and thermal stresses in a fault state. Therefore, before the MMC valve is put into operation, a series of targeted tests are required to test whether the design of the converter valve meets the engineering requirements.
When the MMC valve is in operation and faults such as short circuit of a direct current pole line of a system to the ground or direct connection of a bridge arm occur, the converter valve is subjected to overcurrent with high amplitude, and at the moment, a core component IGBT of the converter valve can be reliably turned off according to design requirements to avoid burning. To assess this performance, an overcurrent shutdown test of the valve was required. At present, a few patents about MMC valve fault current detection methods exist at home and abroad, and the methods proposed by the patents can be divided into two types according to the structural characteristics of detection circuits. The first type is that a single or a plurality of MMC sub-modules are adopted to discharge to a load reactance to generate overcurrent, and a water heating mode is used for ensuring that the IGBT has higher junction temperature before the overcurrent; and the second type is that a short-circuit current branch circuit mainly composed of a current-limiting reactor is added on the basis of a steady-state operation test circuit, and when the steady-state operation test circuit operates for a period of time and the IGBT junction temperature is stable, the short-circuit current branch circuit is switched on when the sample valve outputs the highest level to form overcurrent. The first type of test circuit has the defect that the limit temperature of water temperature heating is 100 ℃, while the steady-state junction temperature of the current crimping type IGBT device adopted by the latest high-capacity flexible direct-current converter valve reaches 125 ℃, and the water temperature heating method is obviously not applicable; the second type of test circuit has the advantages that electric heating is adopted, the limitation of the upper limit of water heating temperature is avoided, the short-circuit current branch is conducted under the condition that the bridge arm outputs the highest level, on one hand, the duration time of the highest level is limited, the overcurrent amplitude and the rise time are difficult to match, on the other hand, different reactor parameters are required to be configured for different projects, the reactor inductance value is required to be adjustable in a wider range, and the manufacture is difficult.
Disclosure of Invention
In view of this, embodiments of the present invention provide a converter valve overcurrent turn-off test circuit, a method, and a device, so as to solve the problem in the prior art that, during an overcurrent turn-off test on a converter valve, a steady-state junction temperature of an IGBT cannot be reached by a water temperature heating method or different reactor parameters need to be configured when an overcurrent is formed through an added short-circuit current branch.
Therefore, the embodiment of the invention provides the following technical scheme:
according to an aspect of the present invention, there is provided a converter valve overcurrent shutdown test circuit, including: a power supply, an auxiliary valve (Va), a test valve (Vt), a load reactor (L1), a current limiting reactor (L2), and a thyristor valve (Vs); the auxiliary valve (Va) is formed by connecting m MMC sub-modules in series, the test valve (Vt) is formed by connecting n MMC sub-modules in series, the load reactor (L1) is connected between the auxiliary valve (Va) and the test valve (Vt), the current limiting reactor (L2) and the thyristor valve (Vs) are connected in series and then connected with the test valve (Vt) in parallel, the anode of the thyristor valve (Vs) is connected with the current limiting reactor (L2), the cathode of the thyristor valve (Vs) is connected with the cathode of the test valve (Vt), the output end of the power supply is provided with m pairs of independent output ports, and the m pairs of output ports are connected with each MMC sub-module capacitor of the auxiliary valve (Va) to charge the auxiliary valve (Va); m is a natural number greater than 3, and n is a natural number greater than 3.
Optionally, the MMC sub-module is composed of a capacitor (C), an upper tube IGBT (T1) and a diode (D1) connected in anti-parallel with the upper tube IGBT (T1), a lower tube IGBT (T2) and a diode (D2) connected in anti-parallel with the lower tube IGBT (T2), a thyristor (Thy) and a bypass switch (K); wherein, go up pipe IGBT (T1) with down pipe IGBT (T2) establish ties after the series with condenser (C) are parallelly connected, thyristor (Thy) and bypass switch (K) with down pipe IGBT (T2) are parallelly connected, just thyristor (Thy) switch on the direction with diode (D2) are unanimous, go up pipe IGBT (T1) with tie point between down pipe IGBT (T2) is the positive pole of MMC submodule piece, the other end of down pipe IGBT (T2) is the negative pole of MMC submodule piece.
Optionally, m is the same as n, and m is less than or equal to 20.
In a second aspect of the present invention, a converter valve overcurrent shutdown test method is provided, which is applied to the converter valve overcurrent shutdown test circuit, and includes the following steps: -unlocking the auxiliary valve (Va) and the test valve (Vt); adjusting the amplitude and phase angle difference of the AC component of the output voltages of the auxiliary valve (Va) and the test valve (Vt) so that the test current reaches a predetermined threshold value; after the IGBT junction temperature is stabilized, locking the auxiliary valve (Va) and the test valve (Vt); and conducting k MMC sub-modules in the test valve (Vt), and simultaneously sending a trigger signal to thyristors (Thy) in the remaining n-k MMC sub-modules so as to enable k MMC sub-module capacitors to discharge through the current limiting reactor (L2) to form overcurrent.
In a third aspect of the present invention, a converter valve overcurrent shutdown test device is provided, which is applied to the converter valve overcurrent shutdown test circuit, and includes: an unlocking module for unlocking the auxiliary valve (Va) and the test valve (Vt); an adjustment module for adjusting the amplitude and phase angle difference of the AC component of the output voltage of the auxiliary valve (Va) and the test valve (Vt) such that the test current reaches a predetermined threshold; a blocking module for blocking the auxiliary valve (Va) and the test valve (Vt) after the IGBT junction temperature is stabilized; and the processing module is used for conducting k MMC sub-modules in the sample valve (Vt), and simultaneously sending a trigger signal to thyristors (Thy) in the remaining n-k MMC sub-modules so as to enable k MMC sub-module capacitors to discharge through the current limiting reactor (L2) to form overcurrent.
The technical scheme of the embodiment of the invention has the following advantages:
the embodiment of the invention provides a converter valve overcurrent turn-off test circuit, a method and a device, wherein the converter valve overcurrent turn-off test circuit comprises the following components: a power supply, an auxiliary valve (Va), a test valve (Vt), a load reactor (L1), a current limiting reactor (L2), and a thyristor valve (Vs); the auxiliary valve (Va) is formed by connecting m MMC sub-modules in series, the test valve (Vt) is formed by connecting n MMC sub-modules in series, the load reactor (L1) is connected between the auxiliary valve (Va) and the test valve (Vt), the current limiting reactor (L2) is connected with the thyristor valve (Vs) in series and then connected with the test valve (Vt) in parallel, the anode of the thyristor valve (Vs) is connected with the current limiting reactor (L2), the cathode of the thyristor valve (Vs) is connected with the cathode of the test valve (Vt), the output end of a power supply is provided with m pairs of independent output ports, and the m pairs of output ports are connected with each MMC sub-module capacitor of the auxiliary valve (Va) to charge the auxiliary valve (Va); m is a natural number greater than 3, and n is a natural number greater than 3. The problem of in the prior art carry out the overcurrent shutoff test to the converter valve in the process, can not reach the steady-state junction temperature of IGBT through the water temperature heating mode or when forming the overcurrent through the short-circuit current branch road that increases, need dispose different reactor parameters is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a converter valve over-current turn-off test circuit according to an embodiment of the invention;
FIG. 2 is a circuit block diagram of a half-bridge MMC sub-module according to an embodiment of the present invention;
FIG. 3 is a flow chart of a converter valve over-current shutdown test method according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a voltage-current waveform of a submodule successfully shutting off an overcurrent according to an embodiment of the invention;
fig. 5 is a block diagram of a converter valve overcurrent shutdown test device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
The embodiment of the invention provides a converter valve overcurrent turn-off test circuit, as shown in fig. 1, the converter valve overcurrent turn-off test circuit comprises: a power supply, an auxiliary valve Va, a test valve Vt, a load reactor L1, a current limiting reactor L2, and a thyristor valve Vs. The power supply may be, for example, a dc voltage source, and the output of the dc voltage source has m pairs of independent output ports, which are connected to each sub-module capacitor of the auxiliary valve Va to charge the auxiliary valve Va and the test valve Vt. The double-bridge arm pair dragging thyristor valve isolation reactor discharge main circuit topology containing a plurality of sub-modules is adopted, the test circuit structure is simple, and the investment is saved.
The auxiliary valve Va is formed by connecting m MMC sub-modules in series, the test valve Vt is formed by connecting n MMC sub-modules in series, the load reactor L1 is connected between the auxiliary valve Va and the test valve Vt, the current limiting reactor L2 is connected with the thyristor valve Vs in series and then connected with the test valve Vt in parallel, the anode of the thyristor valve Vs is connected with the current limiting reactor L2, the cathode of the thyristor valve Vs is connected with the cathode of the test valve Vt, m pairs of independent output ports are arranged at the output end of a power supply and connected with each MMC sub-module capacitor of the auxiliary valve Va to charge the auxiliary valve Va. To facilitate adjustment of the ac component amplitude and phase angle difference of the output voltages of the auxiliary valve Va and the sample valve Vt, m is n in an alternative embodiment. In order to ensure the efficiency of the overcurrent turn-off test of the converter valve and simultaneously avoid overhigh voltage level and overlarge capacity of test equipment, the value of n and m is recommended to be between 3 and 20 (20 is more than or equal to n and more than or equal to 3).
By adopting the converter valve overcurrent turn-off test circuit and adopting a double-bridge arm pair dragging thyristor valve isolation reactor discharge main circuit topology containing a plurality of sub-modules, the test circuit has a simple structure and saves investment; the IGBT junction temperature can be heated to more than 100 ℃ by adopting an electric heating mode of steady-state operation of the pair-pulling circuit, and the temperature equivalence is high; the number of the test sample valves put into the MMC sub-modules is flexibly selected to participate in adjusting the amplitude and the rising rate of the test current, so that the requirement on the adjustable parameter of the reactor L2 is lowered, and the difficulty in manufacturing equipment is lowered; and a blocking signal complementary sending mode is adopted to provide backup protection for a test circuit, so that the test safety is improved.
In an alternative embodiment, the MMC sub-module circuit structure diagram is shown in fig. 2, and is composed of a capacitor C, an upper tube IGBT (T1) and a diode D1 connected in anti-parallel with the upper tube IGBT (T1), a lower tube IGBT (T2) and a diode D2 connected in anti-parallel with the lower tube IGBT (T2), a thyristor Thy and a bypass switch K; the upper tube IGBT (T1) and the lower tube IGBT (T2) are connected in series and then are connected in parallel with the capacitor C, the thyristor Thy and the bypass switch K are connected in parallel with the lower tube IGBT (T2), the conduction direction of the thyristor Thy is consistent with that of the diode D2, the connection point between the upper tube IGBT (T1) and the lower tube IGBT (T2) is the anode of the MMC sub-module, and the other end of the lower tube IGBT (T2) is the cathode of the MMC sub-module. In use, the capacitor C has a certain level of voltage, and the sub-module is switched on when T1 turns on and T2 turns off, and the sub-module is switched off when T1 turns off and T2 turns on.
In another alternative embodiment, a converter valve overcurrent turn-off test method is further provided, which may be used in the converter valve overcurrent turn-off test circuit described above, and fig. 3 is a flowchart of a converter valve overcurrent turn-off test method according to an embodiment of the present invention, as shown in fig. 3, where the flowchart includes the following steps:
step S301, unlocking the auxiliary valve Va and the test valve Vt; in an optional embodiment, the auxiliary valve Va and the test valve Vt are unlocked by switching a corresponding number of sub-modules through the MMC valve according to the control command.
Step S302, adjusting the amplitude and phase angle difference of the alternating current components of the output voltages of the auxiliary valve Va and the test valve Vt to enable the test current to reach a preset threshold value; the test current is the maximum continuous operation test current of the MMC valve, and each project can provide specific numerical value requirements for the waveform and the size of the test current according to IEC standard or national standard requirements.
Step S303, after the IGBT junction temperature of the sample valve is stable, the auxiliary valve Va and the sample valve Vt are locked; and locking, namely the test valve and the auxiliary valve stop working, the IGBTs of all the MMC sub-modules are not switched on or off any more, and the natural state is kept. And step S304, conducting k MMC sub-modules in the sample valve Vt, and simultaneously sending a trigger signal to thyristors Thy in the remaining n-k MMC sub-modules so as to enable k MMC sub-module capacitors to discharge through the current limiting reactor L2 to form overcurrent.
The overcurrent turn-off test method for the flexible direct current converter valve, which is provided by the steps, can meet the temperature requirement, flexibly adjust the test current, reduce the equipment manufacturing difficulty and meet different engineering requirements.
Specifically, after the test is started, the direct-current power supply is started, the auxiliary valve Va and the test valve Vt are charged sequentially, the two valves are unlocked simultaneously after the charging is completed, and alternating-current and direct-current superposed voltages are output. And adjusting the amplitude and the phase angle difference of the alternating current components of the Va output voltage and the Vt output voltage to enable the test current to reach a stable operation required value. After the test valve Vt submodule is operated for a period of time, after the IGBT junction temperature of the test valve Vt submodule is stabilized, Va and Vt are simultaneously locked, then an upper tube T1 of k submodules (n is larger than or equal to k and is larger than or equal to 1) is conducted in the next control period (about 100us), and a trigger signal is sent to thyristors Thy in the remaining n-k level submodules of the test valve. In this way, the input k sub-module capacitors are discharged through L2 to form an overcurrent, and then the sub-modules are turned off automatically after detecting that the overcurrent reaches the protection threshold. No matter whether the k sub-modules are successfully turned off or not, the overcurrent will be subjected to the blocking signal of the main circuit control system again within a limited time after reaching the protection threshold value to serve as backup protection, so that the sub-modules are prevented from being burnt out after being failed in self-turn-off. The voltage-current waveform diagram of the submodule successfully shutting off the overcurrent is shown in fig. 4.
In another optional embodiment, a converter valve overcurrent turn-off test device is further provided, and the device is used for implementing the above embodiments and preferred embodiments, and the description of which is already given is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 5 is a block diagram of a converter valve overcurrent shutdown test device according to an embodiment of the present invention, which is applied to the converter valve overcurrent shutdown test circuit, and as shown in fig. 5, the converter valve overcurrent shutdown test device includes: an unlocking module 51 for unlocking the auxiliary valve Va and the test valve Vt; the adjusting module 52 is used for adjusting the amplitude and the phase angle difference of the alternating current components of the output voltages of the auxiliary valve Va and the test valve Vt, so that the test current reaches a preset threshold value; a locking module 53, configured to lock the auxiliary valve Va and the test valve Vt after the IGBT junction temperature is stabilized; and the processing module 54 is configured to turn on k MMC sub-modules in the sample valve Vt, and send a trigger signal to the thyristors Thy in the remaining n-k MMC sub-modules, so that the k MMC sub-module capacitors are discharged through the current limiting reactor L2 to form an overcurrent.
The converter valve overcurrent shutdown test apparatus in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC circuit, a processor and a memory executing one or more software or fixed programs, and/or other devices that can provide the above-described functions.
Further functional descriptions of the modules are the same as those of the corresponding embodiments, and are not repeated herein.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (5)
1. A converter valve overcurrent turn-off test circuit is characterized by comprising:
a power supply, an auxiliary valve (Va), a test valve (Vt), a load reactor (L1), a current limiting reactor (L2), and a thyristor valve (Vs);
the auxiliary valve (Va) is formed by connecting m MMC sub-modules in series, the test valve (Vt) is formed by connecting n MMC sub-modules in series, the load reactor (L1) is connected between the auxiliary valve (Va) and the test valve (Vt), the current limiting reactor (L2) and the thyristor valve (Vs) are connected in series and then connected with the test valve (Vt) in parallel, the anode of the thyristor valve (Vs) is connected with the current limiting reactor (L2), the cathode of the thyristor valve (Vs) is connected with the cathode of the test valve (Vt), the output end of the power supply is provided with m pairs of independent output ports, and the m pairs of output ports are connected with each MMC sub-module capacitor of the auxiliary valve (Va) to charge the auxiliary valve (Va); m is a natural number greater than 3, and n is a natural number greater than 3.
2. Converter valve overcurrent turn-off test circuit according to claim 1, characterized in that the MMC submodule consists of a capacitor (C), an upper tube IGBT (T1) and a diode (D1) connected anti-parallel to the upper tube IGBT (T1), a lower tube IGBT (T2) and a diode (D2) connected anti-parallel to the lower tube IGBT (T2), a thyristor (Thy) and a bypass switch (K); wherein, go up pipe IGBT (T1) with down pipe IGBT (T2) establish ties after the series with condenser (C) are parallelly connected, thyristor (Thy) and bypass switch (K) with down pipe IGBT (T2) are parallelly connected, just thyristor (Thy) switch on the direction with diode (D2) are unanimous, go up pipe IGBT (T1) with tie point between down pipe IGBT (T2) is the positive pole of MMC submodule piece, the other end of down pipe IGBT (T2) is the negative pole of MMC submodule piece.
3. The converter valve overcurrent turn-off test circuit of claim 1, wherein m and n are the same, and m is less than or equal to 20.
4. A converter valve overcurrent turn-off test method, characterized by being applied to the converter valve overcurrent turn-off test circuit of claim 1, comprising the steps of:
-unlocking the auxiliary valve (Va) and the test valve (Vt);
adjusting the amplitude and phase angle difference of the AC component of the output voltages of the auxiliary valve (Va) and the test valve (Vt) so that the test current reaches a predetermined threshold value;
after the IGBT junction temperature is stabilized, locking the auxiliary valve (Va) and the test valve (Vt);
and conducting k MMC sub-modules in the test valve (Vt), and simultaneously sending a trigger signal to thyristors (Thy) in the remaining n-k MMC sub-modules so as to enable k MMC sub-module capacitors to discharge through the current limiting reactor (L2) to form overcurrent.
5. A converter valve overcurrent shutdown test device, which is applied to the converter valve overcurrent shutdown test circuit of claim 1, and which comprises:
an unlocking module for unlocking the auxiliary valve (Va) and the test valve (Vt);
an adjustment module for adjusting the amplitude and phase angle difference of the AC component of the output voltage of the auxiliary valve (Va) and the test valve (Vt) such that the test current reaches a predetermined threshold;
a blocking module for blocking the auxiliary valve (Va) and the test valve (Vt) after the IGBT junction temperature is stabilized;
and the processing module is used for conducting k MMC sub-modules in the sample valve (Vt), and simultaneously sending a trigger signal to thyristors (Thy) in the remaining n-k MMC sub-modules so as to enable k MMC sub-module capacitors to discharge through the current limiting reactor (L2) to form overcurrent.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3654510A1 (en) * | 2018-11-19 | 2020-05-20 | Maschinenfabrik Reinhausen GmbH | Pre-charging a modular multilevel converter |
| CN109946600B (en) * | 2019-04-03 | 2024-02-13 | 国网冀北电力有限公司电力科学研究院 | Device for detecting internal electrical performance of converter valve submodule and control method |
| CN110596580B (en) * | 2019-09-05 | 2021-12-24 | 许继集团有限公司 | Flexible-straight converter valve overvoltage bypass test method and device |
| CN111398772A (en) * | 2020-04-14 | 2020-07-10 | 许继电气股份有限公司 | Circuit, method and device for converter valve overcurrent turn-off test |
| CN111579981B (en) * | 2020-06-05 | 2022-07-19 | 全球能源互联网研究院有限公司 | Circuit and method for simulating switching-on and switching-off voltage of converter valve |
| CN111650504B (en) * | 2020-06-05 | 2022-12-09 | 全球能源互联网研究院有限公司 | Circuit and method for simulating switching-on and switching-off voltage of converter valve |
| CN113866610B (en) * | 2021-10-22 | 2022-07-01 | 广东电网有限责任公司广州供电局 | Direct connection protection detection method and related device of full-bridge power module |
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