UPFC fault transition device and method based on thyristor transfer resistance circuit
A technology of transfer resistors and thyristors, applied in the field of AC power transmission, can solve problems such as series and parallel side MMC overcurrent blocking, UPFC cannot operate, etc.
Active Publication Date: 2020-07-03
NORTHWEST BRANCH OF STATE GRID POWER GRID CO +1
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Problems solved by technology
[0003] The purpose of the present invention is to provide a UPFC fault ride-through device and method based on a thyristor transfer resistance circuit, to solve the problem that the existing UPFC often leads to overcurrent blocking of the MMC on the series and parallel sides when a short-circuit fault occurs in the AC system, and the UPFC cannot operate.
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[0027]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] The purpose of the present invention is to provide a UPFC fault ride-through device and method based on a thyristor transfer resistance circuit, to solve the problem that the existing UPFC often leads to the overcurrent blocking of the MMC on the series and parallel sides when a short-circuit fault occurs in the AC system, and the UPFC cannot operate. .
[0029] In order to make the above objects, features and advantages of the present inve...
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Abstract
The invention discloses a UPFC fault transition device and method based on a thyristor transfer resistance circuit. According to the invention, a transfer resistance circuit and an anti-parallel double-thyristor group are arranged on a direct current bus, so that the fault transition of MMC-UPFC is achieved; if an active power transmission direction between UPFC normal operation converters is froma series connection side to a parallel connect side, when a serious short-circuit fault occurs in a system line, the short-circuit energy of the series connection side MMC is absorbed by quickly switching in the transfer resistance circuit, and the parallel connection side MMC is isolated from the series connection side MMC; if the active power transmission direction between the UPFC normal operation converters is from the parallel connection side to the series connection side, when the serious short-circuit fault occurs in the system line, the anti-parallel double-thyristor group can automatically cut off the reverse fault current of the direct current bus, and the parallel connection side MMC and the series connection side MMC are automatically isolated; and the UPFC is switched to theSTATCOM mode, reactive power support is provided for the bus voltage of the system after the fault, and safe operation of the power system after the fault is facilitated.
Description
technical field [0001] The invention relates to the technical field of AC power transmission, in particular to a UPFC fault ride-through device and method based on a thyristor transfer resistance circuit. Background technique [0002] UPFC (Unified Power Flow Controller, Unified Power Flow Controller), as a typical representative of FACTS (Flexible Alternating Current Transmission Systems, flexible AC transmission technology) device, can flexibly realize parallel compensation, series compensation, phase shifting, voltage regulation, line flow control, etc. Function. MMC (ModularMultilevel Converter, Modular Multilevel Converter) has the advantages of high modularity, less harmonic content, and strong fault handling capabilities. It has been more and more widely used in practical engineering. When a short-circuit fault occurs in the AC system, the fault current is coupled to the MMC on the series side through the series transformer, and flows through the DC bus to form a loo...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02J3/06H02H7/26H02J3/18H02M1/32
CPCH02H7/26H02J3/06H02J3/1821H02M1/32Y02E40/10
Inventor 张健康李怀强胡勇郑涛王赟鹏
Owner NORTHWEST BRANCH OF STATE GRID POWER GRID CO