华北—华中—华东交直流输电系统数模混合仿真

Digital and Analog Hybrid Simulation of Interconnected UHVAC/UHVDC Transmission System From North China via Central China to East China

将全数字实时仿真与高压直流输电物理仿真装置相结合,建立了三华等值电网的详细电磁暂态实时仿真模型和物理直流系统仿真模型。详细模拟了"三纵三横一环网"特高压网架,主要针对以下内容进行了实时仿真试验研究:直流系统双极紧急停运;直流多落点地区交直流相互影响。试验结果表明:±500 kV和±660 kV直流系统发生双极闭锁故障时,无需采取安稳措施;±800 kV直流输电系统发生双极闭锁故障时,送端系统通过适当切机措施确保恢复稳定运行;华东直流多落点地区交流故障会导致该地区多回直流发生换相失败,但均在交流故障清除后相继恢复功率输送,系统恢复稳定运行;2015年"三纵三横一环网"三华电网安全稳定性满足《电力系统安全稳定导则》要求,网架结构可行。

Combining full digital real-time simulation with physical simulation device for high voltage DC power transmission, a detailed electromagnetic transient real-time simulation model integrating with physical DC transmission system model of the equivalent network for the interconnected UHV power grid consisiting of North China power grid, Central China power grid and East China power grid is built. The main contents of detailed real-time simulation of the main network of the interconnected UHV power grid are bipolar emergency outage of the DC system and the interaction between AC and DC system in the region with multi-infeed DC system. Simulation results show that when bipolar emergency outage occurres in ＋500 kV and ＋660 kV DC system, the system is stable and it is not necessary to adopt security and stability measures; when when bipolar emergency outage occurres in ＋800 kV DC system, the stable operation can be revocered by properly tripping out generation units at sending system; the fault occurred in the region with multi-infeed DC system in East China UHVAC system will cause commutation failures of multi DC circuits in this region, however after the AC fault is cleared, the DC power transmission will successivele recovered and the stable operation will also recovered; the UHV power backbone in 2015 can meet the requirements of guidelines for power system stability, the network structure of this inteconnected power grid is feasible.