交直流联络线局部控制的变参数等值模型

VARIABLE PARAMETER EQUIVALENT MODEL FOR AC/DCPARALLEL TIE-LINE LOCAL CONTROL

直流功率调制器可以对交直流联络线进行局部控制或改善交直流混合系统的运行特性。提出了可以较好地反映非线性及系统时变性的交直流联络线局部控制的变参数等值模型 ,解决了交直流联合输电系统局部控制的系统等值问题。首先在理论上论证了该变参数等值模型的存在性及等值参数与端口信息的关系。进一步给出了仅利用就地局部信息在线求得实时等值参数及实时控制信号的实用算法。最后以一个 6机测试系统为例实际验证了该模型和算法的可行性及有效性。

The current controller on the HVDC line can do AC/DC parallel tie-line local control or improve the stability of AC/DC hybrid power systems. This paper proposes a variable equivalent model for the tie-line local control, which can very well reflect the non-linearity and time-varying properties of power system. This equivalent model and the relations between equivalent parameters and the boundary variables are inferred firstly in theory. And then, a practical method is given for obtaining the real-time equivalent parameters and control signals of the current controller only by using the local information. At last, the feasibility and effectiveness of the equivalent model and the method are testified by a 6-machines test system. This project is supported by National Key Basic Research Special Fund of China (No. G1998020312).