Reactive Power Coordinated Control Method for AC Filter and Condenser in DC Converter Station

Abstract

The invention discloses a reactive coordination control method for a direct current converter alternating current filter and a phase modifier. The reactive coordination control method comprises the steps of reserving enough dynamic reactive power storage for operating points of the phase modifier in a steady-state condition of a direct current converter alternating current voltage; for ensuring the dynamic reactive power storage of the phase modifier while a condition of switching of the alternating current filter is needed, controlling the phase modifier to act in advance, controlling the reactive power increasing or decreasing direction to be opposite to the reactive power changing direction caused by switching of the alternating current filter, so as to reduce alternating current voltage fluctuation caused by switching of the alternating current filter; and under the condition of the direct current converter alternating current voltage fluctuation, if the extremity of the phase modifier is reached while the alternating current voltage still cannot be regulated to a preset value, performing rapid switching of the alternating current filter for ensuring stability of the alternating current voltage. By virtue of the reactive coordination control method, the technical problem of not high coordination degree between the phase modifier and the direct current converter reactive compensation equipment in the prior art is solved, and the stability of an alternating current and direct current parallel serial system can be reinforced.

Description

technical field [0001] The invention relates to a reactive power coordination control method for an AC filter and a condenser of a direct current converter station, belonging to the field of high-voltage direct current transmission control. Background technique [0002] my country's energy distribution and load development are extremely unbalanced. Hydropower resources are mainly concentrated in several provinces in the southwest, coal resources are mainly concentrated in Shanxi, Shaanxi and western Inner Mongolia, wind power and solar power are also concentrated in the northwest, and loads are mainly concentrated in the eastern coastal areas. Therefore, long-distance large-capacity power transmission is imperative. In recent years, my country's UHV transmission technology has developed rapidly, the UHV transmission distance has increased from hundreds of kilometers to several thousand kilometers, and the single-circuit line transmission capacity has increased to 8 million ki...

AI Technical Summary

Problems solved by technology

When the AC or DC system fails, it will cause fluctuations in the AC bus voltage, and the insufficient dynamic reactive power compensation capability of the grid will greatly increase the risk of grid voltage instability

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