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Method for decreasing voltage fluctuation

A voltage fluctuation and constant voltage technology, applied in the field of static dynamic reactive power compensation device SVC, can solve the problems of system impact, transient voltage fluctuation of commutation bus, etc., and achieve the effect of solving output lag and small reactive power fluctuation

Inactive Publication Date: 2010-09-29
CSG EHV POWER TRANSMISSION +1
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Problems solved by technology

Therefore, within the 20ms response time of the SVC device, the transient voltage fluctuation of the commutation bus caused by the switching of the reactive power group will not be suppressed, and the switching of the reactive power group will cause an impact on the system

Method used

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  • Method for decreasing voltage fluctuation

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Embodiment Construction

[0039] Since the SVC has a response time of 20ms, if the constant voltage control is adopted, the transient voltage fluctuation of the high-voltage bus in the power system substation or converter station will have no effect during this period, and may cause impact on the system. Therefore, at this time, the SVC should receive Decrease or increase the TCR trigger angle reference value when switching the command of the reactive power group, increase or decrease the output reactive power of the SVC, so that the reactive power fluctuation on the bus is as small as possible.

[0040] See figure 1 , when the system voltage fluctuates too much, in order to quickly track and adjust the voltage, the control loop is blocked and does not respond to the signal of the system switching reactive power group. In order to avoid DC single-stage blocking, because the DC bus voltage is too high, the reactive power group in the station needs to cut off at this time. In this case, instantaneous adj...

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Abstract

The invention relates to a method which can realize that the voltage fluctuation can be decreased when a reactive compensation capacitor or a filter of a direct-current convertor station is switched. In the method, the reference value of a TCR triggering angle is lowered or increased when an SVC receives a command that an electric power system switches a reactive group, and the consumption of the SVC to reactive power is increased or decreased, so that the reactive fluctuation on a bus bar is as small as possible; and the method can effectively suppress the voltage fluctuation caused by the switching of the reactive compensation capacitor or the filter of a transformer substation or the direct-current convertor station of the electric power system, so that the range of the fluctuation and the deviation of the steady-state value of the voltage of the system, which is caused by the condition that the transformer substation or the direct-current convertor station of the electric power system switches the reactive compensation capacitor or the filter, is greatly decreased.

Description

technical field [0001] The invention relates to a static dynamic reactive power compensation device SVC used in a power system, in particular to a method capable of reducing voltage fluctuations when switching reactive power compensation capacitors or filters of DC converter stations. Background technique [0002] At present, the known static dynamic reactive power compensation device SVC always lags behind in response to voltage fluctuations in a constant voltage control mode. When the power system substation or DC converter station switches the reactive power compensation capacitor or filter group (referred to as the reactive power group), since the SVC has a response time of 20ms, if the constant voltage control is adopted, at the moment of switching the reactive power group, The constant voltage control needs to wait for 20ms to complete the feedback, calculate the reference value, and change the trigger angle of the thyristor to change the output. Therefore, within the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/02
Inventor 尚春张正祥龚天森胡蓉林永左强李海生安万洙王兴陈晏伯虞苍璧丁雅丽
Owner CSG EHV POWER TRANSMISSION
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