摘要
该文将整个交直流混合电力系统建模为一个级联系统:直流系统为第一级,交流系统为第二级,并为多馈入直流输电系统设计了非线性调制策略:为交流子系统设计虚拟控制,该虚拟控制能够增强交流子系统的阻尼;对直流子系统进行调制策略设计,使得交流子系统的输出能够渐近地跟踪所要求的虚拟控制,并保证整个系统的状态不发散。所设计的调制策略提供了2个正定矩阵参数KD和KV。矩阵KD决定了虚拟控制增强交流系统阻尼的能力;矩阵KV决定了直流子系统的输出渐近地跟踪虚拟控制的能力。仿真结果验证了文中方法的有效性。
In this paper, AC/DC hybrid system is modeled as a cascade system, with DC system as the first subsystem and AC system as the second one. Based on this model, a nonlinear DC power modulation controller for multi-infeed HVDC links is presented. Firstly, a virtual control is designed to damp oscillations among generators in the receiving-end AC system; Secondly, DC power modulation strategy is designed to guarantee that, not only the output of the DC system can asymptotically track the desired virtual control but also the states of the entire cascade are not divergent. The modulation strategy designed by this paper provides two matrix parameters, KD and KV, which respectively determine the ability of the virtual control to improve the AC system＇s performance and the ability of DC system＇s output to track the virtual control. Simulation results on a 10-machine 39-bus AC system with 5 DC links located in it show that the modulation strategy designed by this paper is very effective.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第23期7-11,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(50377017)~~
关键词
电力系统
级联系统
直流输电
直流调制
非线性系统
Power systems
Cascade systems
HVDCtransmission
HVDC transmission control
Nonlinear systems
