调度方式和负荷水平对小扰动稳定域的影响

借助WSCC 3机9节点系统研究了调度方式和负荷水平变化对小扰动稳定域的影响。首先利用边界追踪算法求解了系统在特定负荷水平下的小扰动稳定域,它是由4条Hopf分岔曲线围成的封闭区域,基于计算结果讨论了调度方式改变对小扰动稳定域的影响;然后求解了系统在不同负荷水平下的小扰动稳定域,研究了负荷水平变化时小扰动稳定域扩大、缩小、直至消失的过程,并进一步讨论了负荷水平变化对小扰动稳定域的影响。研究表明,负荷水平的变化会导致系统小扰动稳定域的组成和范围发生改变,而发电机调度方式的变化则只会改变系统当前的运行点,对小扰动稳定域的构成不产生影响。

Impact of Load Increase and Generation Dispatch on Small Signal Stability Region

By means of WSCC 3-machine 9-bus system, the impact of load increase and generation dispatch on small signal stability region (SSSR) is studied. Firstly, based on a tracing algorithm, the system SSSR under specified load level is calculated, which is a closed region composed of four Hopf bifurcation carves. According to calculation results, the impact of generation dispatch on SSSR is discussed. Secondly, SSSRs under different load levels are solved, and the process that SSSR may be enlarged, shrank or even disappears when load level changes is researched. Furthermore, the impact of load variation on system SSSR is analyzed. Research results show that the load level variation may cause the variation of composition and range of SSSR, and the change of generation dispatch only impacts current operation point of system and does not impact the composition of SSSR.