Phase modifier constant voltage control method and system coordinated with extra-high voltage direct current converter station reactive voltage control and medium

Abstract

The invention discloses a phase modifier constant voltage control method and system coordinated with extra-high voltage direct current converter station reactive voltage control and a medium. The method comprises the following steps executed after a filter bank or capacitor bank switching instruction is sent out by direct-current control protection: calculating the deviation between estimated target voltage and an initial voltage target after a small filter group / capacitor group is switched in; and correcting the voltage control target of a phase modifier according to the deviation between theestimated target voltage and the initial voltage target after delaying for a specified time, and adjusting the steady-state reactive output of the phase modifier to zero or a specified numerical value of which the difference value with zero is less than a preset threshold value. According to the invention, the internal control logic of an existing direct-current control protector is not requiredto be changed, the control mode of the phase modifier can be simplified from a double-loop mode to a single-loop control mode, the phase modifier and an alternating-current filter group, a capacitor and a reactor controlled by a direct-current control protection system can be simply and effectively coordinated and controlled, and the dynamic regulation capability of the phase modifier is fully exerted.

Description

technical field [0001] The present invention relates to power system operation and control technology, in particular to a method, system and medium for adjusting phase constant voltage control coordinated with the reactive power voltage control of UHV DC converter stations, which are used to realize UHV converters considering the current control status. Coordinated control of voltage / reactive power between the condenser in the flow station and the AC filter bank controlled by the DC control and protection system. Background technique [0002] The HVDC transmission system based on voltage commutation uses a large number of semi-controlled devices, which may cause commutation failure and consume a large amount of reactive power when the system is disturbed or faulty. In the receiving end system with weak feed-in AC system strength and poor voltage recovery characteristics, it is usually considered to install a dynamic reactive power compensation device to improve the system op...

AI Technical Summary

Problems solved by technology

At present, the voltage switching value is generally set at 5% U n Deviation, mostly from the consideration of serious faults in the DC near area to prevent commutation failure, for failure to cause voltage deviation exceeding 5% U n The AC system voltage fluctuations cannot respond, and the dynamic adjustment function of the condenser cannot be fully utilized. U n To control the rated voltage of the bus voltage, generally 525kV

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