Method, system and medium for phase generator constant voltage control coordinated with reactive voltage control of UHV DC converter station

Abstract

The invention discloses a method, system and medium for constant voltage control of phase modulation coordinated with reactive power and voltage control of an ultra-high voltage direct current converter station. The following steps: Calculate the deviation between the estimated target voltage and the initial voltage target after a small filter bank / capacitor bank bank is put into operation; after a delay for a specified time, correct the voltage control target of the camera according to the deviation between the estimated target voltage and the initial voltage target , adjust the steady-state reactive power output of the camera to zero or a specified value whose difference from zero is less than the preset threshold. The invention does not need to change the internal control logic of the existing DC control and protection system, and can simplify the control mode of the camera from a double-loop control mode to a single-loop control mode, and can simply and effectively coordinate the control of the camera and the AC filter group controlled by the DC control and protection system. , capacitors and reactors, give full play to the dynamic adjustment ability of the camera.

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 voltage fluctuation of the AC system cannot respond, and the dynamic adjustment function of the condenser cannot be fully exerted. Among them, U n To control the rated voltage of the bus voltage, generally 525kV

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