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讨论了以负荷为参数的多参数空间中的电力系统Hopf分岔控制问题。电力系统中负荷的变化和控制决策的生成及实施(如投切电容器等)是在不同的时间尺度上进行的。前者是一个比较缓慢的过程,而后者是在一个较短的时间内完成的。通常情况下,在控制决策生成的一个小的时间尺度上系统负荷不会发生突变。基于上述事实,提出了一种以系统负荷为参数的Hopf分岔的在线控制方法,其原理为:当系统的平衡(运行)点接近Hopf分岔面时,直接计算与当前平衡(运行)点对应的Hopf分岔面的近似法向量,然后以近似法向量作为控制参数的调节方向对控制参数进行调节,以避免系统发生Hopf分岔。IEEE14节点算例验证了上述方法的有效性。
The Hopf bifurcation control problem of power system in multi-parameter space with load as parameter is discussed. Load changes in power systems and the generation and implementation of control decisions (such as switching capacitors) are performed on different time scales. The former is a relatively slow process, while the latter is completed in a relatively short period of time. In general, there is no sudden change in system load on a small time scale that control decisions are generated. Based on the above facts, an on-line control method of Hopf bifurcation with system load as a parameter is proposed. The principle is that when the system’s equilibrium point is close to the Hopf bifurcation plane, The approximate normal vector of the corresponding Hopf bifurcation plane is obtained, and then the control parameter is adjusted by using the approximate normal vector as the adjusting direction of the control parameter to avoid Hopf bifurcation in the system. An example of IEEE14 node verifies the validity of the above method.