含柔性并网装置的半波长输电线路多结构并网研究

Study on multi-structure grid-connection of half-wavelength transmission line with flexible grid-connection device

考虑到并网偏差过大可能给半波长交流输电系统带来的隐患以及由于半波长线路的超长距离无法实现线路两端电网对并网参数的实时调节,同时考虑了未来半波长系统并网结构的多样性,设计了三种典型半波长输电线路的并网结构,将柔性并网装置应用于多结构的半波长线路并网调节中。然后分析接入UPFC的半波长输电系统等效电路,研究了该柔性并网装置的适用性。并通过Matlab/Simulink软件进行仿真,结果表明采用的柔性并网装置适用于多种并网结构的半波长输电线路,能够大幅改善并网特性。该结果可为未来半波长输电工程的多结构并网控制提供相应的支撑。

Considering the hidden danger caused by large grid-connection deviation for half-wavelength AC transmission systems,difficulty to simultaneous adjustment of grid-connection parameters at both ends of half-wavelength line due to its long distance,and future variety of grid-connection structures for half-wavelength systems,this paper designs three typical kinds of grid-connection structures of half-wavelength transmission line and uses the flexible device for grid-connection adjustment.Then,the equivalent circuit of half-wavelength transmission system connected with UPFC is analyzed,and also the applicability of the flexible grid-connection device is studied.By simulating in Matlab/Simulink platform,the results show that the flexible grid-connection device is suitable for multi-structure half-wavelength transmission lines,and it can generally improve the grid-connection characteristics.The results can provide support for multi-structure grid-connection control of half-wavelength transmission projects in the future.