电力现货交易对换流站无功和分接头调节的影响

Influence of Electricity Spot Trading on Reactive Power Regulation and Tap Changer of Converter Station

通过直流系统输送功率调整完成现货交易会对换流站无功调节和换流变分接头动作产生较大影响。介绍了电力现货交易的概念、换流站无功调节绝对最小滤波器限制及无功调节Q控制、换流变分接头角度控制和电压控制原理,阐述了电力现货交易下的功率调整对换流站无功调节和换流变分接头动作的影响。结果表明在变量多、频度高、不确定性大的电力现货交易模式下,换流站无功滤波器投切次数和换流变分接头调节次数明显升高,说明了电力现货交易在一定程度上会增加换流站系统运行的风险,可能影响运行人员对直流系统的故障预测和判断的结论。

The conduction of power transmission of the DC system could help to complete the electricity spot trading.In addition,it might impact the reactive power regulation of the converter station and the action of the converter transformer tap.This paper introduced the concept of electricity spot trading,the absolute minimum filter limit for reactive power regulation in converter stations,and the principle of Q control of reactive power regulation,tap changer of the converter transformer angle control,and voltage control.Moreover,it introduced the influence of the power adjustment under the electricity spot trading on the reactive power adjustment of the converter station and the tap changer action of the converter transformer.The results show that under the electricity spot trading mode with multiple variables,high frequency,and high uncertainty,the switching times of the reactive power filter of the converter station and the adjustment times of the tap changer are significantly increased.Besides,it elaborates that the electricity spot trading could improve the risk of the converter station system operation,which might affect the fault prediction and judgment of the operators for the DC system.