CAJ | 학술논문

风力发电作为一种清洁可再生的发电方式,在全球范围内正以惊人的速度发展.变速恒频双馈式风力发电系统要求双馈电机控制系统具有响应速度快、鲁棒性强的特点.双馈式异步电机(DFIG)在参数变化内部扰动和风机负载转矩振荡外部扰动共同影响下,会导致现有PI控制转子电流响应动态性能变差,电机工作效率和稳定性降低.滑模变结构控制(SMC)是一种基于状态空间的非线性控制方法,进行设计时与对象参数及扰动无关,这就使得SMC控制与PI控制策略相比具有快速响应、对参数变化及扰动不敏感的优点.针对上述问题,本研究在双馈电机控制系统中引入滑模变结构控制,设计一种基于指数趋近律的积分型滑模变结构控制器,并利用边界层设计以减小滑模控制的振颓.仿真表明,该控制策略可提高DFIG的动态性能,增强其抗干扰性,有效降低SMC的振颤.并具有设计过程简单、易于实现等优点.
풍력발전작위일충청길가재생적발전방식,재전구범위내정이량인적속도발전.변속항빈쌍궤식풍력발전계통요구쌍궤전궤공제계통구유향응속도쾌、로봉성강적특점.쌍궤식이보전궤(DFIG)재삼수변화내부우동화풍궤부재전구진탕외부우동공동영향하,회도치현유PI공제전자전류향응동태성능변차,전궤공작효솔화은정성강저.활모변결구공제(SMC)시일충기우상태공간적비선성공제방법,진행설계시여대상삼수급우동무관,저취사득SMC공제여PI공제책략상비구유쾌속향응、대삼수변화급우동불민감적우점.침대상술문제,본연구재쌍궤전궤공제계통중인입활모변결구공제,설계일충기우지수추근률적적분형활모변결구공제기,병이용변계층설계이감소활모공제적진퇴.방진표명,해공제책략가제고DFIG적동태성능,증강기항간우성,유효강저SMC적진전.병구유설계과정간단、역우실현등우점.
Wind power is a clean and renewable energy, and its exploitation is developing rapidly across the world. The Variable Speed Constant Frequency (VSCF) wind power generation system requires the Double Feed Induction Generator (DFIG) to have high response speed as well as good robustness. The DFIG will be affected both by internal disturbance of parametric variations and external disturbance of the load torque oscillation. The dynamics of the current response of the present PI controlled rotor may be in bad conditions. In addition, the above disturbances reduce efficiency and stability of the wind turbine. Slide Mode Control (SMC) is a kind of nonlinear control methods based on state space and is independent of object parameters and disturbances. Compared with PI control, SMC has a faster response, and is insensitive to the parameter variations and disturbances. This paper proposes a sliding-mode variable structure controllerI, as an integral action under exponential approximation law. The controller uses the boundary-layer design to reduce the vibration of the sliding-mode control. The simulation indicates that the dynamic performance and the anti-interference ability of DFIG are improved. The vibration is effectively reduced by adopting this control strategy with a simple design process and easy implementation.