摘要
在装设了统一潮流控制器(unified power flow controller,UPFC)的弱阻尼连接多机系统中,综合利用全系统的线性化状态方程和传递函数的信息,设计了线性化的UPFC稳定控制器。为使该稳定控制器能在系统大范围内的运行点提供有效阻尼,文中在UPFC稳定控制器中加入一可调的超前(滞后)环节,利用Prony分析在线辨析系统低频振荡特性。利用在线辨析的结果对稳定控制器的可调环节进行微调,使之针对系统具体运行工况进行自适应校正,从而持续工作在最佳状态。最后利用电磁暂态仿真程序对一个装设有UPFC的两区域弱阻尼连接系统进行了仿真计算。仿真结果表明,文中设计的自适应校正UPFC稳定控制器能够明显提高该系统的阻尼水平。
In a multi-machine power system with weak damping link in which unified power flow controller （UPFC） is installed, based on linearized state equations of the whole power system and by means of utilizing state equations and the data of tmsfer function comprehensively, a linear stabilizer for UPFC is designed. To make this stabililzer possible to provide effective damping for the operation points within a large range of the system, a first order adjustable phase compensation block is added in the designed stabilizer for UPFC, and online discrimination of low frequency oscillation characteristic of the system is analyzed by Prony algorithm. Using the obtained results of online discrimination, free-adjustment is performed in the adjustable phase compensation block to make it conducting adaptive critic for concrete operating condition of power system, thus the designed stabilizer can contineously operate in optimal state. Finally, by use of Electromagnetic Transients including DC programm （EMTDC）, a two-area power system with weak damping link, in which UPFC is configured, is simulated. Simulation results show that the damping level of this power sytem can be evidently imropved by the designed adaptive critic stabilizer.
出处
《电网技术》
EI
CSCD
北大核心
2008年第21期37-41,共5页
Power System Technology
