Method and system for coordinate control of voltage and reactive power of phase regulator and UHVDC convert station

Abstract

A method and system for coordinate control of voltage and reactive power of a camera and an UHVDC convert station. The method comprises steps of keeping the AC filter bank switching strategy of DC control and protection system unchanged, Obtain the filter of DC control and protection, the switch instruction of reactor group, the operation mode and related control parameters and the operation stateof the adjuster, adjust the control target of the adjuster according to the switch instruction of DC control and protection, and intervene the switch instruction of AC capacitor and reactor output byDC control and protection. As that invention is base on the reactive power control of the UHVDC transmission and the exist control mode of the camera, The utility model can reduce the bus voltage fluctuation when the AC filter bank is switched on and off, reduce the switching times of the capacitor and the reactor bank, prolong the service life of the AC capacitor and the reactor, and at the sametime, do not need to change the DC control protection and the internal control logic of the adjuster, so that the utility model is convenient to implement.

Description

technical field [0001] The present invention relates to power system operation and control technology, in particular to a method and system for coordinating control of voltage and reactive power between a regulator and an UHV DC converter station, which is used to realize the regulator and the DC converter in an UHV converter station considering the current control status. Coordinated control of voltage / var between AC filter banks controlled by the control protection system. Background technique [0002] As a long-distance and large-capacity power transmission method, HVDC transmission has great advantages over traditional AC transmission in terms of construction economy and operation loss, but its operation needs to consume a lot of reactive power and generate a lot of harmonics, so it is especially A large number of reactive power devices need to be configured in the high-voltage converter station. Generally, AC filters, capacitors and reactor groups are configured, and re...

AI Technical Summary

Problems solved by technology

There are not many reactive power coordinated control methods involving condensers and DC transmission. For example, the Chinese patent document with application number 201710307415.7 discloses a reactive power coordinated control method for AC filters and condensers in DC converter stations. The time-switching condenser adjusts the reactive power in the direction opposite to the filter action direction in advance to reduce the voltage impact when the filter is switched. It only considers the dynamic voltage stabilization ability of the condenser, and does not consider the stability State reactive support capacity

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