Steady-state reactive coordination control method for synchronous phase modifier and direct-current converter station

Abstract

The invention discloses a steady-state reactive coordination control method for a synchronous phase modifier and a direct-current converter station. An information interconnection channel between a phase modifier AVC substation and a direct current control and protection system is added; coordination control parameters are set in the direct current control and protection system and the phase modifier AVC substation; the reactive power compensation required by the direct-current converter station is changed; the AVC substation of the phase modifier takes information such as reactive power exchange capacity of an AC / DC system as a criterion; and along with the change of reactive compensation required by the direct-current converter station, the phase modifier AVC substation takes informationsuch as reactive exchange quantity of an alternating current-direct current system as a criterion, and issues a filter capacitor bank switching correction instruction and a phase modifier reactive power regulation instruction according to the principles of preferential action of a filter capacitor bank, subsequent fine regulation of the phase modifier, filter capacitor under-compensation and phase-delay compensation of the phase modifier, so that the reactive power exchange capacity of the alternating current-direct current system is within the capacity of the half filter capacitor bank. According to the invention, the voltage stability level of the direct-current receiving-end power grid can be effectively improved, only the reactive power exchange capacity of the whole direct-current converter station and the alternating current-direct current system needs to be paid attention to based on a phase modifier AVC substation local control mode, global optimization and coordination are not needed, the control strategy is simple, the calculated amount is small, and the practicability is high.

Description

technical field [0001] The invention relates to the technical field of reactive power control in electric power systems, in particular to a steady-state reactive power coordinated control method for a synchronous condenser and a DC converter station. Background technique [0002] With a large number of UHV DC projects put into operation, in order to meet the needs of DC power consumption and peak shaving in the AC power grid at the receiving end, the scale of conventional units in the region is gradually reduced, the dynamic reactive power support capacity of the system is weakened, and the voltage stability margin is continuously reduced. , especially for the weak receiving end power grid, the system voltage instability caused by AC fault has become the main factor that threatens the safe and stable operation of the power grid. [0003] In response to the impact of severe faults on the power grid, corresponding measures can be carried out from two aspects: emergency control...

AI Technical Summary

Problems solved by technology

The synchronous condenser is mainly used to provide dynamic reactive power support. Although it is connected to the AVC (Automatic Voltage Control, automatic voltage control) system for unified deployment, it will not participate in the steady-state voltage regulation of the system in principle. Effort is zero

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