用于提高电压稳定裕度的发电机无功出力管理

电力系统电压稳定裕度大小与系统无功储备相联系,研究了通过管理系统发电机的无功出力来提高系统的电压稳定裕度。把重新安排系统无功出力形成一个优化问题,采用伪梯度进化算法(PGEP)寻求全局的最优解,在搜索过程中利用模式分析技术指导寻优方向。对新英格兰10机39节点系统的仿真分析表明,与常规进化算法(SEP)相比,所提出的方法具有更快的收敛速度与更好的寻优能力,能够增加系统的无功储备,同时减少系统的有功及无功损耗,在不增加新设备及不改变系统有功分布的情况下使系统的电压稳定裕度得到明显提高。

Reactive power generation management for improvement of voltage stability margin

Power system VSM(Voltage Stability Margin) relates to the reactive power reserves in power network.Improvement of VSM using reactive power generation management of system generators is studied.The management of var generation is formulated as an optimization scheme and PGEP(Pseudo-Gradient Evolutionary Programming) is used to obtain the optimal solution,in which modal analysis technique guides the searching direction.Simulation results of New England 10-generator 39-bus system demonstrate that,compared with SEP(Standard Evolutionary Programming),the proposed method performs better in convergence speed and searching ability.With the optimal reactive power rescheduling,the reactive power reserves of system is increased and both the active and reactive power losses decreased,system VSM is thus obviously improved without adding new var compensation equipment and changing active power distribution.