直流阻尼调制在大规模交直流电网中的作用

Function of HVDC damping modulation in large scale AC/DC power systems

采用一种暂态能量函数,剖析直流阻尼调制抑制低频振荡的机理。基于留数,指出制约直流调制效果的关键因素,对直流调制在交直流电力系统中的运行特性进行分析,认为采用广域信号可以提高直流调制对区间振荡的抑制效果。以我国第1个交直流混合电网——南方电网为背景,验证理论分析的正确性。在此基础上,对直流阻尼调制在大规模交直流电网中的作用进行总结。

The control mechanism of HVDC damping modulation was revealed through a kind of transient energy function. Using residues, the key factor that determines modulation effect was then indicated, which gave an insight into the basic properties of DC damping modulation in large-scale AC/DC power systems. Use of remote signals in DC modulation was proposed. Analysis and simulation results in a real power grid, the China Southern Power Grid, provide the evidence for the theoretical analysis. In the end of the paper, the function of HVDC damping modulation in large scale AC/DC power systems was summarized.