A high-voltage direct current transmission project AC voltage acquisition control method and device

Abstract

The invention discloses a method for collecting and controlling alternating voltage in a high-voltage direct current transmission project. The method comprises the steps that 1, whether a large-set filter bus is in a charging state or not and whether the large-set filter bus is connected with an alternating current bus or not are judged; 2, voltage out-of-limit judgment is conducted on voltage of the large-set filter bus; 3, deviation of measured voltage of the large-set filter bus is judged; 4-7, reactive power control is conducted on voltage calculation in different conditions; 8, the invalid stage of the voltage of the large-set filter bus is judged. The invention further discloses a device for controlling alternating voltage collection in the high-voltage direct current transmission project. The device comprises a large-set filter bus state judging unit, an out-of-limit judgment unit, a voltage collecting deviation judging unit, reactive power control voltage calculating units in different conditions and an invalid state judgment unit. Based on control over the alternating current voltage of three-phase voltage collecting logic of an alternating current filter bus, the effects that the reliability is high and alternating current voltage control is accurate are achieved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for coordinated control of harmonic performance and voltage of a high-voltage direct current transmission system. Background technique [0002] The AC voltage control function of the DC transmission project is used to limit the AC voltage from exceeding the normal operating range, which will affect the normal operation of the DC system. It includes reactive power control with slow regulation and overvoltage control with fast regulation. The main control objects of reactive power control are the AC filters and reactors of the whole station. According to the current DC operation mode and voltage and current levels, the reactive power consumption of the whole station is calculated, and by controlling the switching of all reactive devices, it is guaranteed that the whole station and The reactive power exchange of the AC impact system is within the allowable...

AI Technical Summary

Problems solved by technology

In the transient process, it may be insufficient to judge the actual AC voltage exceeding the limit based on the single-phase voltage of the AC bus. Abnormal switching

It can be seen that the accuracy and reliability of the original AC voltage control method based on the AC bus single-phase voltage acquisition logic are insufficient

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