摘要
为了抑制电力系统静止无功补偿器(SVC)的非线性特性、未建模动态、系统参数变化及外部扰动影响,应用变结构控制理论与鲁棒控制理论,设计了能同时改善电力系统功角稳定与装设点电压动态性能的SVC非线性变结构鲁棒控制器。控制器考虑了含SVC的单机——无穷大系统(SMIB)模型可能的不确定性项,以其标称系统所对应的代数Riccati方程的解来构造滑动模态超平面,进而给出变结构鲁棒控制算法。设计的控制规律简洁,鲁棒性强且易于工程实践。仿真结果表明,与传统PI控制方式相比,变结构鲁棒控制器能够更有效地阻尼系统振荡,提高系统暂态稳定性能。
In order to attenuate the influences of nonlinearity, unmodelled dynamic, uncertainties of parameters perturbation and external disturbances on power system caused by a static var compensator （SVC）, a nonlinear variable structure robust control strategy for SVC is proposed in this paper. The controller for the nonlinear system is designed using variable structure control theory, robust control theory and direct feedback linearization technique. Firstly, the nonlinear model of a single-machine infinite-bus system including SVC with uncertainties is analyzed. Then based on the method for constructing sliding mode hyperplane with the solution of the algebraic Riccati equation of normal system, a variable structure robust control algorithm is carried out. The control law has simple structure, strong robustness, and is easy to realize. The proposed controller can improve power angle stability of power system and ensure local voltage quality. Finally, the control logic is evaluated on a single-machine infinite-bus system. The simulation results demonstrate that SVC with the proposed controller can damp the oscillation and enhance the transient stability of the power system more effectively than that with the conventional PI control.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2008年第3期46-49,共4页
Proceedings of the CSU-EPSA
基金
江苏省高新技术研究项目(BG2004024)
江苏省高校自然科学研究计划项目(JHB05-42.06KJB470015)
江苏省南通市科委资助项目(Z5008)
关键词
静止无功补偿器
变结构控制
鲁棒控制
滑动模态
static var compensator
variable structure control
robust control
sliding mode
