基于目标全息反馈的STATCOM与发电机励磁的多目标非线性协调控制

Multi-Objective coordinated Control for STATCOM and generator excitation Based on Objective Holographic Feedbacks

针对以往静止同步补偿器(STATCOM)数学模型具有较多约束条件的问题,以STATCOM内部并联电容的直流电压Udc为切入点,采用STATCOM的脉冲控制角和STATCOM超前系统电压角为控制量,提出一种新型的STATCOM数学模型。借助非线性多目标控制设计理念,选取6个跟踪状态目标;基于目标全息反馈控制原理,将非线性系统的多目标控制问题转换到线性系统中,得到包含全部控制目标反馈信息的非线性控制律u,完成了凸极式发电机励磁与STATCOM协调控制策略的设计,并通过单机无穷大系统对其进行暂态仿真。仿真结果表明:利用目标全息反馈非线性控制设计方法设计的协调控制律能较好地改善发电机的输出特性,有效地抑制系统电压的静态偏移,改善电力系统的暂态稳定性,提升系统协调控制的动、静态性能。

In view of the previous mathematical model of static synchronous compensator （STATCOM） with many constraint conditions, taking the internal shunt capacitance Udc of STATCOM as the breakthrough point, using STATCOM＇s impulse control angle ~ and its advanced system voltage angle α as control quantities, a new type of mathematical model of STATCOM is put forward. Using nonlinear multi objective control design concept, six tracking targets are selected. According to object holographic feedback control principle, in order to get the nonlinear control law containing all target control feedback information, the nonlinear system multi objective control problem is switched to a linear system. The design of coordination and control strategy is completed which contain salient-pole type generator excitation and STATCOM. The simulation results show that the coordination control law which is designed based on the objective holographic feedbacks can better improve the generator output characteristics, effectively inhibit the system voltage offset, and improve the transient stability of power system and the coordinated control system＇s dynamic and static performances.