调速系统对孤网频率稳定性影响分析

Influence Analysis of Governing System on Frequency Stability of Isolated Power Grid

随着区间电网的互联,各地区的自然资源得到充分的利用。但是有些区间联络线由于输电走廊限制等原因相对较弱,一旦发生解列事故,容易形成送端(受端)孤立电网,将导致局部系统功率严重失衡,系统的频率稳定问题就会凸显出来。以新疆阿勒泰地区电网为研究对象,分析调速系统调速特性以及调速系统对孤网频率稳定性的影响,得出孤网中不同容量机组调速系统对孤网频率影响不同;水电机组调速系统和火电机组调速系统对孤网频率影响不同;不同容量水电、火电机组调速系统之间的配合对孤网频率影响不同。运用PSASP仿真验证了相关结论。这对实际电网运行、水电和火电机组调速系统之间的配合具有重要的参考价值。

Along with the interconnection of interval power grids, natural resources in different areas have been utilized suffi- ciently. But because of the weakness of some interval links caused by transmission corridor limit and so on, the send - end i- solated power grid and the receiving - end isolated power grid will come into being easily if the splitting accidents happen, which will lead to the serious power imbalance of local system, and some problems about the stability of system frequency will come up. Taking the power grid of Ahay as the objective of the research, the characteristic of governing system and the influ- ence of governing system on frequency stability of isolated power grid are analyzed. It is obtained that the governing system of the unit with different capacity has different impacts on the frequency of isolated power grid, the governing system of hydroelec- tric generating set and the governing system of thermoelectric generating set have different impacts on the frequency of isolated power grid, and the cooperation between governing systems of hydroelectric generating set and thermoelectric generating set with different capacity has different impacts on the frequency of isolated power grid. The simulation with PSASP verifies the re- lated conclusions, which has an important reference for the operation of actual power grid and the cooperation between the gov- erning systems of hydroelectric generating set and thermoelectric generating set.