解列后局部电网功角首摆失稳问题研究

基于EEAC理论,研究解列后局部电网功角首摆失稳问题。构建三区域互联电网,形成局部电网解列后等值模型。针对无故障解列和故障后解列两种情况,分析解列前后局部电网的等值单机无穷大母线(OMIB)系统的功角-功率特性曲线变化特点。结合解列后局部电网首摆功角稳定裕度计算,从对OMIB系统解列时刻的相对动能、解列扰动后的首摆加速面积以及最大减速面积的影响方面。分析影响首摆稳定性的因素。最后,基于电力系统安全稳定量化分析与优化决策软件FASTEST,在等值电网和实际大电网进行仿真验证。研究结论有助于采取有针对性的防控措施以提高解列后局部电网安全稳定水平。

A study on the first swing of angle instability in the local power network after splitting

Based on the theory of extended equal area criterion (EEAC), the first swing of angle instability in the local power network after splitting is studied in this paper. A 3-region interconnected power system is constructed, and then, the equivalent model of the local power network after splitting is built. With the respect to the non-fault and fault-driven splitting, the change characteristics, that exist in the power-angle curve of one machine-infinity bus(OMIB) system of the local power network before and after splitting, is analyzed. Based on the computation of stability margin, the main influence factors of the first swing of angle instability are studied, according to Relative Kinetic Energy of OMIB when splitting, the acceleration area and the maximum deceleration area of the first swing. FASTEST based simulation results of the equivalent small power grid and the actual large power grid are given to show the conclusion. This work is supported by Science and Technology Project of State Grid Corporation of China "Multi-stability Morphology Interactive influence Analysis and Control Technique Research under Large Grid Serious Fault".