摘要
随着新能源接入电网规模的不断增加,特高压直流外送成为其消纳的重要途径,与此同时,特高压直流故障造成新能源送端电网暂态过电压直接威胁新能源安全运行,成为当前亟待解决的问题。为此,本文以祁韶特高压直流送端电网为背景,对特高压直流故障对新能源送端电网暂态过电压作用机理进行分析,并提出针对暂态过电压的控制策略。首先建立新能源经直流外送等效模型,其次对特高压直流故障对送端电网暂态过电压的作用机理进行分析,基于此,提出新能源送端电网暂态过电压控制策略。最后以祁韶特高压直流送端电网为背景仿真验证了控制策略的有效性。
With the continuous increase in the scale of new energy access to the power grid, UHVDC transmission becomes an important way to absorb it. Meanwhile, UHVDC faults causing transient overvoltage in the power grid of new energy delivery directly threaten the safe operation of new energy, which has become an urgent problem to be solved at present. Therefore, based on the background of Qishao UHVDC power supply network, this paper analyzes the mechanism of UHVDC fault on the transient overvoltage of new energy power supply network, and puts forward the control strategy for the transient overvoltage. Firstly, the equivalent model of new energy through DC is established. Secondly, the mechanism of UHVDC fault on transient overvoltage of power grid is analyzed. Based on this, the control strategy of transient overvoltage of power grid of new energy is proposed. Finally, the effectiveness of the control strategy is verified by simulation of Qishao UHVDC power grid.
