直流系统的控制策略对南方电网暂态稳定性的影响

分析了直流系统整流侧的控制策略对南方电网稳定性的影响。指出由于交流换相电压对直流特性的影响，定电流控制比定功率控制更有利于维持系统的暂态稳定性；而如果用恒电流负荷或恒功率负荷模型来代替直流系统时，则有相反的结论。通过量化分析方法揭示了上述现象的机理。

INFLUENCE OF DC SYSTEM'S CONTROL STRATEGY ON THE TRANSIENT STABILITY OF SOUTH CHINA POWER GRID

With constant dc power and constant dc current control strategy being adopted at the rectifier side of 3 dc links involved in the South China power grid, the influence of dc system's control strategy on the transient stability of the whole South China power grid is analyzed in detail. The stability mechanism with different dc control strategy being used is also explained from a quantitative point of view. With the aid of the EEAC theory, a practical case is used to testify the proposed explanations. The intrinsic difference between constant dc power and constant dc current control is also pointed out. Simulation results show that, compared with the constant dc power strategy, the transient stability of the whole South China power grid will be improved with the constant dc current control strategy being implemented at the rectifier side of 3 dc links.