500kV限流器接入对广东电网潮流分布影响分析

Analysis of Influence of 500 kV Current Limiter Access on Power Flow Distribution in Guangdong Power Grid

串联限流电抗器能有效限制500 kV电压等级的短路电流,但其接入系统后会影响系统的潮流分布和暂态稳定。基于广南站利用BPA仿真软件研究高耦合电抗型的500 kV/90 kA限流器装设在线路上之后的潮流变化和故障场景下的最大功角差变化。结果表明,当500 kV限流器的耦合系数为0.97时,对外表现的漏电抗较小,不会影响系统正常工作时的节点电压,但是其对外表现的漏电抗,仍然可能造成无功损耗的增加;随着耦合系数的降低,限流器对外呈现的漏电抗增大,会拉低节点的正常工作电压,同时会增大电网中的无功损耗。

The series current limiting reactor can effectively limit the short-circuit current of 500 kV voltage level,but it will affect the power flow distribution and transient stability of the system when it is connected to the system.The power flow change and the maximum power angle difference change under the fault scenario of 500 kV/90kA current limiter based on high coupling reactance type are studied by using BPA simulation software in Guangnan railway station.The results show that when the coupling coefficient of 500 kV current limiter is 0.97,the external leakage reactance is small,which will not affect the node voltage in normal operation of the system.However,the leakage reactance of the external performance may still cause the increase of reactive power loss.With the decrease of the coupling coefficient,the leakage reactance of the current limiter increases,which will pull down the normal working voltage of the node and increase the reactive power loss.