A Coordinated Control Method and System for Voltage and Reactive Power of UHVDC Converter Station

Abstract

The invention discloses a voltage reactive power coordination control method and system for an ultra-high voltage direct-current converter station. The implementation process of the method includes the following steps that: an alternating current filter bank switching control strategy is kept unchanged; whether a reactive power control strategy in the direct-current control protection system of the ultra-high voltage direct-current converter station is a voltage control mode or a reactive power control mode is judged; if the reactive power control strategy is the voltage control mode, a phasemodifier and a dynamic reactive power compensation device SVC are controlled according to a voltage coordinated control method; and if the reactive power control strategy is the reactive power controlmode, the phase modifier and the dynamic reactive power compensation device SVC are controlled according to a reactive power coordinated control method. The system comprises a computer system programmed to perform the above method. According to the voltage reactive power coordination control method and system for the ultra-high voltage direct-current converter station of the present invention, onthe basis of the existing control modes and basic control strategies of the high-voltage direct-current converter station, coordinated control between the phase modifier and an alternating current filter bank can be realized simply and effectively, a new control system is not needed to be additionally adopted, the reactive power control strategy of the direct-current control protection system andthe existing control mode of the phase modifier are not needed to be changed. The method and system are in line with the status quo of the ultra-high voltage converter station and are easy to implement.

Description

Technical field [0001] The invention relates to power system regulation and control technology, in particular to an UHV DC converter station voltage and reactive power coordinated control method and system, which are used to realize dynamic reactive power compensation such as cameras and SVCs in the UHV converter station considering the current control status The voltage / reactive power coordinated control between the equipment and the AC filter bank controlled by the DC control and protection system. Background technique [0002] HVDC transmission is a long-distance and large-capacity transmission method. Different AC transmission systems, HVDC transmission is a power transmission method based on the shut-off and conduction control of the converter valve. The rectification and inversion of the converter valve need to consume a large amount of reactive power. Therefore, a large number of AC filter banks are configured in the converter station for reactive power compensation and ...

AI Technical Summary

Problems solved by technology

The conditions required by these methods are seriously inconsistent with the current situation. Without increasing the control system of the existing UHV converter station or greatly modifying the control strategy of the condenser and the reactive power control mode of the DC control and protection system, the combination of the two cannot be realized. coordinated control

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