提高交直流系统暂态稳定的非线性最优协调控制  

Optimal Nonlinear Coordinated Control to Enhance Transient Stability of AC/DC Power System

作　　者：程丽敏[1] 李兴源[1] 刘剑[2] 

机构地区：[1]四川大学电气信息学院,成都610065 [2]二滩水电开发有限责任公司,成都610061

出　　处：《高电压技术》2011年第4期1029-1034,共6页High Voltage Engineering

基　　金：国家自然科学基金重点项目(51037003;50877050);国家"十一五"科技支撑计划(2008BAA13B01)~~

摘　　要：针对交直流系统中影响暂态稳定的主要因素,即电磁转矩和机械转矩之间不平衡的问题,结合直流传输功率可进行快速调节的特点,提出了将直流功率调制和汽门开度进行协调控制的方案,以提高交直流系统的暂态稳定性。由于交直流系统为多输入多输出的非线性系统,控制方案采用了非线性系统状态反馈精确线性化理论和线性最优控制理论相结合的设计方法。用一个典型的交直流并联系统进行数字仿真的结果表明,这种协调控制既可以有效地提高交直流系统的暂态稳定性又可以利用HVDC的短时过载能力为突然产生功率严重缺额的地区提供紧急功率支援。The imbalance between electromagnetic torque and mechanical torque of each synchronous machine is the main factor which affects transient stability in the AC/DC transmission systems, and the DC power can be regulated rapidly. Thereby, combining the control of valve opening and DC power modulation, we proposed a coordinated control strategy to improve transient stability. According to the characteristic of system model, namely, a nonlinear system with multi-input and multi-output, the control strategy was designed based on feedback linearization of nonlinear system theory and optimal control theory of linear system. The validity of the coordinated control method was verified in a typical AC/DC parallel hybrid transmission system.

关 键 词：非线性系统 暂态稳定 线性最优控制 交直流并联输电系统 协调控制 电磁转矩 机械转矩 

分 类 号：TM712[电气工程—电力系统及自动化]