负荷频率特性对孤网频率稳定性影响分析

Influence Analysis of Load Frequency Characteristic 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。同时随着国家经济的发展,各地区的负荷类型比重不相同,负荷模型对系统频率稳定性有很大的影响。以新疆和田地区电网为研究对象,分析负荷频率特性对孤网频率稳定性的影响,通过改变孤网中负荷模型,以及各种负荷在孤网中的比例,得出不同的负荷模型对孤网频率稳定性影响程度不同的结论,并运用PSASP仿真验证了相关结论。对实际电网稳定计算时负荷模型的选取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. At the same time, along with the economic development of China, the proportion of load type in each area is differ- ent, and the load model has a huge impact on the stability of system frequency. Taking the power grid of Hotian as the objec- tive of the research, the impact of load frequency characteristics on the frequency stability of isolated power grid is analyzed. It is concluded that the different load model will have different impact on the frequency stability of isolated power grid by chan- ging the load model and the proportion of all kinds of load in isolated power grid. The simulation with PSASP verifies the relat- ed conclusions, which has an important reference for the selection of load model during the stability calculation of actual power grid.