南方电网多直流协调稳定控制系统实现与验证

Implementation and Verification of Multi-DC Coordinated Stability Control System in China Southern Power Grid

随着南方电网“西电东送”直流送电规模的不断扩大以及云南电网外送功率的不断增加,交直流稳定控制系统的耦合现象愈发严重,电网有效的调控能力不断减弱,导致送端电网高频问题突出。为此,设计和实现了南方电网多直流协调稳定控制系统,其通过共享直流稳定控制系统的配套电源,降低云南弃水风险,支撑了南方电网的安全稳定运行。为了验证多直流协调稳定控制系统策略功能的正确性和有效性,策划并实施了新东直流双极闭锁现场传动试验。现场试验结果表明,多直流协调稳定控制策略正确执行、相关装置可靠动作。最后,本文也对多直流协调稳定控制系统的后续优化方向进行了展望。

With the expansions of the scale of HVDC transmission from west to east in the Southern China Power Grid(CSG)and the increase of the transmission power in Yunnan Power Grid,the coupling between the AC and DC stability control systems becomes deeper and the ability of regulation and control turns to be weakened,which further worsen the high-frequency problem of Yunnan Power Grid.Hence,a multi-DC coordinated stability control system is designed and implemented.It reduces the risk of water abandonment and supports the safe and stable operation of CSG by sharing the associated power sources amang HVDCs.In addition,in order to verify the multi-DC coordination stability control system,Xindong HVDC bipolar block field test is planned and implemented.The field test results verify that the stability control strategy is correct,and the devices acted reliably.At last,further improvements of the proposed system are also prospected.