非并联运行AC/DC系统中直流变流器的非线性附加控制器设计  

Design of nonlinear auxiliary power controller for HVDC converters in non-parallel operating AC/DC systems

作　　者：张秀钊[1] 沈沉[1] 梅生伟[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电工电能新技术》2006年第1期49-53,76,共6页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金资助项目(59837270;50377018)

摘　　要：针对交直流联合输电系统中直流线路与交流线路非并联运行的情况,本文为HVDC换流站设计了附加控制器以阻尼交流系统中区域间的功率振荡。文中将直流线路功率调节作用等效为一阶惯性环节,将交直流联合的多机系统等值为两机两区域系统,由此建立了综合考虑机电振荡的三阶模型;然后运用反馈线性化方法设计了交直流系统非线性稳定控制器。仿真结果证明了该文所提出的控制器能有效地阻尼区域间功率振荡,提高系统的暂态稳定性。但同时也引入了其它一些问题。需要进一步研究的内容在最后进行了讨论。A nonlinear auxiliary controller for HVDC converters in AC/DC power systems, where the AC and DC lines are not in parallel connection, was developed to damp inter-area oscillations. The method treats the dynamics of DC power regulation as a first-order inertia block and simplifies the AC/DC multi-machine system into a two-machine power system. Based on the third-order model obtained, state-feedback linearization and LQR approach are applied to design a nonlinear controller. Computer simulation results have shown that the controller can effectively damp inter-area oscillations and enhance transient stability. But the auxiliary control for HVDC converters also introduced some undesirable side effects. Possible problems and future work are discussed at last.

关 键 词：电力系统稳定 高压直流输电系统 区域间功率振荡 状态反馈线性化 

分 类 号：TM721.3[电气工程—电力系统及自动化] TM461