中国电机工程学报2012，Vol.32Issue(16)：36-43,8.
直流调制策略改善交直流混联系统的频率稳定性研究
Improving Frequency Stability of Parallel AC-DC Hybrid Systems by Power Modulation Strategy of HVDC Link
摘要
Abstract
In order to suppress frequency oscillatory when an interconnected AC and DC system is subjected to a load shedding in one area of AC system, the coordination of variable structure control of DC power modulation and turbine-generator steam valve optimization was presented. At first, the simplified model of AC/DC hybrid system was established which was divided into two independent subsystem by adopting overlap decomposition, and then put forward a linear variable structure control of DC power modulation, switching function of variable structure control was establishedby applying optimal control theory. Although the controller decreases the peak of the first swing significantly and is easy to realize, the steady state error is large. To solve the problem, the concept of coordinated control of DC power modulation and fast steam valve optimal control of governor was established. The steam valve controller was studied with linear optimal control theory. Simulation experiments were conducted for the purpose of applying two kinds of control mode under the condition of load disturbance. The result shows the DC power modulation can affect frequency stability at the initial stage of disturbance, it can coordinate with the fast steam valve governor controller to suppress the frequency deviation of steady state error.关键词
变结构控制/交叠分解/直流功率调制/快速汽门控制/协调控制/负荷扰动Key words
variable structure control/overlapdecomposition/DC power modulation/fast steam valve control/coordinated control/load disturbance分类
信息技术与安全科学引用本文复制引用
朱红萍,罗隆福..直流调制策略改善交直流混联系统的频率稳定性研究[J].中国电机工程学报,2012,32(16):36-43,8.基金项目
国家自然科学基金项目f51077045,60974048） （）
湖南省自然科学基金项目（11JJ9013）. （）
