Method for increasing hybrid direct-current rectifier side power in alternating-current fault period

A hybrid DC and rectification side technology, which is applied in the direction of AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problems of hybrid DC transmission power drop, achieve hybrid DC transmission power increase, increase modulation ratio, and reduce DC The effect of voltage

Active Publication Date: 2017-01-11
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

But its control system has the following technical problems: when the AC system of the rectifier station LCC fails, the DC voltage of the rectifier station LCC will drop with the voltage of the AC system, while the inverter station MMC adopts constant DC voltage control and the DC voltage reference value is not change, so the transmission power of the hybrid DC will drop significantly

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  • Method for increasing hybrid direct-current rectifier side power in alternating-current fault period
  • Method for increasing hybrid direct-current rectifier side power in alternating-current fault period
  • Method for increasing hybrid direct-current rectifier side power in alternating-current fault period

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Embodiment Construction

[0023] The technical solution of the present application will be further introduced in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] The invention discloses a power boosting method during an AC fault on a hybrid direct current rectification side. The hybrid direct current transmission system is as attached figure 1 As shown, it includes converter stations at both ends, that is, a rectifier station LCC and an inverter station MMC. The rectifier station LCC is used to rectify the AC side power into DC power and transmit it to the DC transmission line. The inverter station The MMC is used for inverting the electric energy of the DC line into AC electric energy and injecting it into the respective corresponding AC power grids.

[0025] On the basis that the LCC of the rectification station adopts constant DC current control and the MMC of the inverter station adopts constant DC voltage control, an AC voltage detection module is confi...

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Abstract

The invention discloses a method for increasing hybrid direct-current (DC) rectifier side power in an alternating-current fault period. LCC (line commutation converter) in a rectifier station is controlled by constant DC current and MMC (modular multilevel voltage source converter) in an inversion station is controlled by constant DC voltage; an alternating-current (AC) voltage detection module is configured to the LCC in the rectifier station and a maximum modulation ratio module is configured to the MMC in the inversion station. When AC voltage detected by the alternating-current voltage detection module is lower than a set value, the maximum modulation ratio module of the MMC is enabled and the control mode of the MMC is controlled from the constant DC voltage to the maximum modulation ratio. The method has the beneficial effects that the MMC is controlled by the maximum modulation ratio when the hybrid direct-current power transmission system presents the AC fault on the rectifier side, and DC transmission power can be effectively increased.

Description

technical field [0001] The invention relates to a hybrid DC power transmission system based on a grid commutation converter LCC and a modular multilevel voltage source converter MMC, belonging to the technical field of high-voltage power transmission. Background technique [0002] Due to the characteristics of unbalanced regional economic development and reverse energy distribution in my country, it is necessary to adopt the transmission scheme of west-to-east power transmission for a long time. LCC-HVDC has significant advantages in long-distance large-capacity power transmission and grid interconnection, but the multi-infeed DC transmission system formed by multiple LCC-HVDCs placed on the same AC system also brings a series of problems. The most serious one is the cascaded commutation failure of multiple converters due to the voltage drop of the AC system of the inverter station. Introducing flexible DC on the inverter side can improve system performance and reduce the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 刘志超刘涛李婧靓操丰梅黄莹刘斌
Owner BEIJING SIFANG JIBAO AUTOMATION
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