含±800 kV云广直流的南方电网交直流系统 RTDS仿真研究

云广±800 kV特高压直流输电系统投运后（2009年单极投运，2010年双极投运），南方电网结构将更为复杂，交直流并联运行特点愈发显著。因此，建立了南方电网2010年交直流并联电网全电磁暂态RTDS实时仿真模型，并进行仿真分析。结果表明：云广直流系统在孤岛方式下全功率运行时，南方电网系统可能会出现约0.6 Hz振荡，可以通过降低云广直流传输功率解决该问题；云广直流系统发生双极闭锁故障，将影响南方电网稳定运行，须预先研究合适的安稳策略。

RTDS Simulation on AC/DC Hybrid CSG with the ±800 kV Yun-Guang UHVDC Transmission System in Operation

The ±800 kV Yun-Guang UHVDC transmission system will be in operation, monopolar in 2009 and bipolar in 2010. Then China Southern Power Grid (CSG) will be more complex and its AC/DC hybrid characteristic will be more notable. This paper builds up the pure electromagnetism transient Real-Time Digital Simulator (RTDS) model of AC/DC hybrid systems for CSG in 2010, and performs simulation analysis on it. The results show that the 0.6 Hz oscillation may occure in CSG when the Yun-Guang UHVDC transmission system is in rated-power operation with the island operation mode. The ocillation can be restrained by reducing the transmission power of the Yun-Guang UHVDC system. Bipolar blocked fault occured in the Yun-Guang UHVDC system may make CSG lose stability, thus it is necessary to explore in advance appropriate security and stability strategies to stand against it.