A voltage stability control method using DC inverter station as dynamic reactive power source

Abstract

The invention provides a voltage stability control method using a direct current inverter station as a dynamic reactive power source. The method comprises the steps that a direct current receiving end alternating current-direct current series-parallel power grid simulation model is established; the receiving end power grid transient stability is assessed and a control parameter is set; circulation measurement is carried out on high voltage bus voltage of the inverter station and whether the requirements of starting criterion and duration are met is determined; a direct current fallback instruction is calculated and control is executed; circulation measurement is carried out on the high voltage bus voltage of the inverter station and whether a recovery control criterion is met is determined; and a direct current recovery lift instruction is calculated and control is executed. According to the direct current instruction current control method provided by the invention, a direct current power fast control function is used; the dynamic reactive power characteristic of the direct current inverter station is improved; the inverter station is used as the dynamic reactive power source to output capacitive reactive power to an alternating current power grid; a voltage support function is realized; and without extra adding the investment of primary equipment, voltage stability is realized under the large disturbance impact of a lift direct current receiving end power grid.

Description

technical field [0001] The invention relates to a voltage stabilization control method, in particular to a voltage stabilization control method using a DC inverter station as a dynamic reactive power source. Background technique [0002] my country's coal resources are mainly distributed in Shanxi, Shaanxi, Xinjiang and other northwest regions; hydropower is mainly distributed in southwest regions such as Sichuan, Yunnan and Tibet; wind and solar energy are mainly distributed in western and northern regions such as Gansu, Qinghai and Xinjiang; and load centers are located in The four provinces of Middle East China, the Pearl River Delta and the Yangtze River Delta and other regions. The reverse distribution of primary energy and load centers determines that in order to meet the energy demand of economic and social development, it is necessary to develop high-voltage direct current transmission technology with the advantages of large-capacity and long-distance transmission. ...

AI Technical Summary

Problems solved by technology

When the power grid suffers from a disturbance voltage drop, the reactive power consumption of the inverter decreases, but since the reactive power output of the filter decreases by the square of the voltage drop, the reduction in reactive power supply is greater than the reduction in reactive power consumption. Therefore, the net reactive power demand of the DC inverter station increases, presenting a dynamic reactive power load characteristic, which will threaten the voltage stability of the receiving end power grid

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