摘要
在逆变侧交流电压下降期间,逆变器对无功消耗的增多会导致电压进一步恶化,甚至崩溃。因此,在传统PI控制的基础上,基于非线性控制中的状态反馈精确线性化方法,设计了用于降低故障期间逆变器无功消耗的非线性附加控制器。仿真结果表明该非线性附加控制器能合理地调节换流器在电压下降期间对无功功率的吸收,以维持逆变侧电压水平,从而提高系统的暂态稳定性。
During AC voltage dips at the inverter side, AC voltage will deteriorate, even collapse if inverter consumes much reactive power. Therefore, this paper designs an additional nonlinear controllers based on exact linearization method by state feedback of nonlinear control theory and the conventional PI control.The additional nonlinear controller at the inverter side is to prevent inverter consuming too much reactive power during fault. The simulation results show the additional controller at the inverter side can regulate reactive power absorbed by converter reasonably during AC voltage dips, thus, the voltage performance at the inverter side and the transient stability of AC/DC systems can be improved. This project is supported by the National Natural Science Foundation of China(No. 50377017).
出处
《继电器》
CSCD
北大核心
2005年第7期6-9,45,共5页
Relay
基金
国家自然科学基金资助项目(50377017)
关键词
高压直流
非线性附加控制
暂态稳定
精确线性化
HVDC
additional nonlinear control
transient stability
exact linearization
