基于反步法的海上风场并网轻型直流输电变流器控制  

CONTROL OF HVDC-LIGHT TRANSMISSION CONVERTER FOR OFFSHORE WIND FARM BASE ON BACKSTEPPING

作　　者：王国强[1] 王志新[1] 

机构地区：[1]上海交通大学电气工程系,上海200240

出　　处：《太阳能学报》2012年第6期1054-1059,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金重点项目(60934005);中国博士后基金(20080440088);上海市高新技术产业化重点项目计划(2009041);上海市科技发展基金(09195802900);上海市白玉兰科技人才基金(2009B075)

摘　　要：针对变流器数学模型存在非线性和强耦合的特点,提出一种基于带积分环节的反步法控制器的设计方法。首先基于变流器两相旋转坐标系(dq系)数学模型,按照传统反步法理论设计电压外环的虚拟控制,该虚拟控制使直流电压子系统的Lyapunov函数满足系统渐进稳定条件;其次设计电流子系统控制量,使电流子系统状态能够跟踪所需要的虚拟控制并保证整个系统渐进稳定;最后在所设计控制策略中加入直流电压积分环节消除稳态误差,克服反步法设计中不含积分环节、系统阶跃响应不能稳定到零点的问题。经MATLAB仿真,并与传统PI控制器比较,结果表明所采用方法有效、可行。The control of the wind farm and grid side converters is one of the hotspots in theory. In the view of nonlinear and strong coupling characteristic of converter, a kind of backstepping controller combined with integral unit was presented. Firstly, a virtual control was designed for voltage outside-loop based on the mathematic model of converter in two phase rotating frame （ dq frame）. It can make the Lyapunov function of DC voltage system satisfy asymptotically stable condition. Secondly, the control quantity was designed to guarantee that the state variable of current subsystem can track the virtual control and keep the asymptotically stable of the whole system. Finally, the integral unit of DC voltage was added into the control strategy for eliminating steady-state error. It also solves the problem that the system can＇ t comeback to zero-point for step response because of not including integral unit. MTALAB was used for simulation and the results were compared with conventional PI controllers which show that the method is effective and feasible.

关 键 词：风场 电压源换流器 反步法 轻型直流输电 

分 类 号：TM721.1[电气工程—电力系统及自动化]