直驱永磁风力发电系统非线性控制策略  

Nonlinear Control Strategy of Direct-drive Permanent Magnet Wind Power System

作　　者：席云[1] 李啸骢[1] 鹿建成[1] 黄维[1] 黄承喜[1] 查中魁 

机构地区：[1]广西大学电气工程学院,广西南宁530004

出　　处：《电气开关》2015年第3期15-20,共6页Electric Switchgear

基　　金：国家自然科学基金资助项目(51267001);广西科学基金资助项目(桂科自0728027);南宁市市校科技合作专项项目(200801029D);北海市市校科技合作专项项目(北科合200801027)~~

摘　　要：针对风电系统并网的多种控制要求,基于永磁同步发电机的损耗模型,建立了直驱永磁风力发电系统的非线性数学模型,并运用反馈线性化理论提出了多目标非线性控制策略。利用该策略在机侧实现了低于额定风速情况以下的最大风能捕获,并且调节有功直轴电流使其系统损耗最小;同时在网侧稳定直流母线电压和调节无功电流,满足了系统在正常状况下以单位功率因数并网运行的要求;而在电压跌落期间,能迅速提供无功电流,有利于电网电压稳定与恢复,具备一定的低电压穿越能力。仿真结果表明,所提出控制策略是有效而实用的,不仅兼顾了风电系统并网的实际运行要求,而且提高了系统的效率。For various control requirements of wind power system into grid, based on the loss model of permanent mag- net synch- ronous generator,we established a nonlinear mathematical model of direct-drive permanent magnet wind power system, and utilized the feedback linearization theory to design a multi-objective nonlinear control strategy. Used this strategy, we also let the maximum wind energy captured under the rated wind speed, and minimized system loss through adjusting the active direct axis current beside the machine;Meanwhile, to satisfy the requirement that system operated in parallel with the unit power factor in normal condition, the DC bus voltage need to be stabilized and reactive current have to be regulated on the side network;and during the voltage sags, it can quickly provide the reactive current, which is an advantage to the grid voltage stability and recovery, so that it possesses the capability of low voltage ride- through. Simulation results show the correctness and the effectiveness of the proposed control strategy, it can provide both the actual operation requirements of wind power system into grid, and improve the efficiency of the system. This work is supported by National Natural Science Foundation of China（ No. 51267001 ） and by Guangxi Natural Science Foundation of China（ No. 0728027 ）.

关 键 词：直驱永磁风力发电系统 损耗 最大风能捕获 反馈线性化 非线性控制 

分 类 号：TM71[电气工程—电力系统及自动化]