摘要
在风速随机、间歇且不确定的风电场中,为实现风力发电机组最大输出功率的跟踪控制,使风力发电系统根据变化风速调节风机转子转速以达到跟踪控制目标。基于无刷双馈风力发电机abc三相静止坐标数学模型推导出电机三套绕组在α-β两相静止坐标系下的电压方程,并构建电机的欧拉-拉格朗日模型。从能量角度分析了无刷双馈风力发电系统中电气子系统与机械子系统的无源性,并设计无源性转速调节控制器。为降低电机变化参数对控制系统的干扰,在无源性控制器中注入变阻尼项以改善系统动态响应。为了验证该控制策略的有效性,结合矢量控制和恒阻尼注入在Matlab/Simulink平台上进行建模仿真对比,仿真结果表明该控制策略可快速跟踪转速期望值,具有更好的鲁棒性和动态响应。
As wind speed varies randomly,intermittently and uncertainly in the wind farm,wind turbines maximum power output tracking control can be achieved by regulating rotor speed according to the wind speed. Base on the analysis abc three-phase axis model of brushless doubly-fed generator（ BDFG）,the α-β two-phase static axis equations of the winding voltage were derived,and the Euler-Lagrange model of BDFG was constructed. The passivity of the electrical subsystem and mechanical subsystem of BDFG were analyzed from the energy viewpoint. The passivity-based controller was designed to regulate the speed of BDFG. The flexible damping was added into the controller to improve the system dynamic response and reduce the interference from parameter variations in control system. Modeling on Matlab / Simulink platform and contrasting with vector control and constant damping,and the simulation results show that passivity-based controller with flexible damping could faster track the desired value of speed and have better robustness and dynamic performance.
出处
《电测与仪表》
北大核心
2016年第21期41-47,共7页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51307025
5177050
51407035)
广东省高等学校科技创新项目(2013KJCX0059)
广东省科技计划项目资助(2016B090912006)
