摘要
先进静止无功发生器(ASVG)的控制方法是影响其补偿性能和效果的重要因素,其传统PI控制器结构简单,参数设计容易,但动态稳定性较差。为提高系统稳定性,将ASVG的数学模型用Euler-Lagrange系统表示,采用无源控制(PBC),设计ASVG的PBC控制器,从理论上保证ASVG系统的Lyapunov函数稳定性,但当系统出现干扰时ASVG安装点的系统交流电压和电容器直流电压波动太大。基于此,提出ASVG无源非线性综合控制方案,即:电流内环控制采用基于PBC的控制,ASVG安装点交流电压和电容器直流电压的双外环控制均采用PI控制,既保持了所提出的综合控制器能在大干扰下提高系统的稳定性,也能够快速有效地将ASVG安装点的系统电压和电容器直流电压控制在允许的范围内波动。具有ASVG的单机-无穷大系统的Matlab仿真结果表明了控制系统模型的正确性和所设计的综合控制器的有效性。
Control method is an important factor influencing the compensation performance of ASVG（Advanced Static Var Generator）. The traditional PI（Proportional-Integral） controller has simple control structure and easy parameter design, but poor dynamic control stability. To improve its dynamic stability, E-L（Euler-Lagrange）system is used to represent the mathematical model of ASVG and PBC（Passivity-Based Control） is adopted in its controller design,which guarantees Lyapunov function dynamic stability of ASVG. As the DC capacitor voltage and AC bus-bar voltage fluctuate greatly when disturbances occur in ASVG system, the PBC-based hybrid ASVG controller is proposed：inner current-loop PBC and dual outer voltage-loop PI control, which effectively enhances the dynamic stability of system with big disturbances and controls the DC capacitor voltage and AC bus-bar voltage within allowable range. Matlab simulation of single-machine infinite-bus system with ASVG shows the correctness of control system model and the effectiveness of designed controller.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第3期61-64,共4页
Electric Power Automation Equipment
基金
教育部科学技术研究重点项目资助(104117)~~
