摘要
随着新能源等可变因素的增多,现有的频率调节方法无法实现对频率的有效调节。在综合了系统频率空间差异以及不同发电机组对频率调节的出力不同的基础上,提出了一个改进型的频率调节模型。该模型为每个独立的汽轮发电机调速器动态建立了小干扰条件下的线性模型,并对互联电网的线性模型进行了改进;采用奇异摄动方法降低了线性系统的复杂性,简化了控制策略的设计和应用;基于系统降阶模型,利用线性最优控制的方法对反馈控制规则进行了优化设计。通过对一个3节点的测试系统进行仿真,验证了该方法的控制效果。
The currently implemented frequency regulation approach is found unable to relieve the impact of the increasingly integrated variable sources such as renewable power plants and price responsive loads. Even several key underlying assumptions of this approach are not likely to hold in this situation. In this paper we propose an enhanced frequency regulation approach by differentiating units participating in frequency regulation both with respect to their location and ability to respond. This approach models the governor-turbine-generator （GTG） dynamics of each individual generator and develops a linearized model of the interconnected power system. Moreover, the singular perturbation technique is employed to reduce the unnecessary complexity of the linear system and simplify the control design. An optimal feedback control law is then designed based on the reduced order model via linear quadratic regulator （LQR） method. Comparative simulations on a 3-bus test power system show the improved control performance obtained by the proposed approach.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第22期78-82,共5页
Power System Protection and Control
关键词
频率调节
GTG
奇异摄动
反馈控制规则
线性最优控制
frequency regulation
GTG
singular perturbation
feedback control law
linear quadratic regulator
