适应电网与仿真技术发展的交直流电网动态等值

AC / DC Grid Dynamic Equivalence Adapted to Power System and Simulation Technology Development

随着特高压交直流同步大电网的建设,原有的区外等值方案已经不能满足工程实际的需求。而从实际应用而言,只有电磁暂态仿真存在对电网等值简化的需求,且随着实时仿真技术和能力的提高,对于仿真规模的要求也在放宽。根据电网及实时仿真能力的发展,提出了新条件下的区内等值原则。按照新的等值原则,对2015水平年华东电网进行了等值研究。对华东电网等值研究的结果表明,采用该原则等值后的华东电网,在大幅缩减电网规模的同时很好地保留了原网的潮流及暂态特性,可应用于电磁暂态实时仿真研究。

There are three common used methods of dynamic equivalence,in w hich the coherent equivalent algorithm is the most practical in engineering. With the development of large-scale UHV AC / DC synchronous grid,the original outside equivalent schemes have been unable to meet the practical demand of engineering. From the current practical application,only electromagnetic transient simulation has equivalent simplification demand for pow er grid. With the improvement of realtime simulation technology and ability, the requirements of the simulation scale are also relaxed. According to the development of pow er grid and real-time simulation,the new inside equivalent principle w as proposed. On the basis of it,this paper studies the equivalent level of the East China pow er grid in 2015. The equivalent research result show s that the East China pow er grid after using this equivalent principle can significantly reduce the grid scale and w ell maintain the load flow and transient performance of original grid,w hich can be applied in the electromagnetic transient real-time simulation study.