Primary Frequency Modulation Algorithm for Wind Turbine Based on Sliding Mode Variable Structure
李继超 1贾梦欣 1陈超波 1张彬彬 1王坤 1杨冰2
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作者信息
1. 西安工业大学电子信息工程学院,西安 710021
2. 西安应用光学研究所,西安 710065
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摘要
针对并网风电场中,经典一次调频控制方法存在抗干扰能力弱、机组易脱网的问题,提出一种基于滑模变结构的风电机组一次调频控制算法.首先,在永磁同步风电机组工作原理的基础上,建立含有大电网的风电机组模型.其次,为了解决传统比例积分微分(proportional integral differential,PID)控制下抗干扰能力弱的问题、引入经典滑模变结构控制器.然后,针对经典滑模变结构控制器导致执行机构存在抖振较多的缺点,提出一种基于sigmoid函数趋近率的滑模变结构一次调频控制算法.最后,通过MATLAB/Simulink对风电机组一次调频进行建模仿真,并与经典控制算法相比,验证了所提算法的可行性,在风速波动和电网故障的环境下,滑模变结构一次调频控制算法更具有效性.
Abstract
For grid-connected wind farms,the classical frequency modulation control method has the problems of weak anti-interference ability and easy off-grid unit.A frequency modulation control algorithm for wind turbines based on sliding mode variable structure was proposed.Firstly,based on the working principle of permanent magnet synchronous wind turbine,a wind turbine model containing large power grid was established.Secondly,in order to solve the problem of weak anti-interference ability under traditional proportional integral differential(PID)control,the classical sliding mode variable structure controller was introduced.Then,in view of the shortcoming of the classical sliding mode variable structure controller which leaded to more chattering,a sliding mode variable structure primary frequency modulation control algorithm based on sigmoid function reaching rate was proposed.Finally,MATLAB/Simulink was used to model and simulate the primary frequency modulation of wind turbines.Compared with the classical control algorithm,the feasibility of the proposed algorithm was verified.Under the circumstance of wind speed fluctuation and power grid failure,the sliding mode variable structure primary frequency modulation control algorithm is more effective.
关键词
风电机组/永磁同步发电机(PMSM)/一次调频/滑模变结构控制器
Key words
wind turbine/permanent-magnet synchronous motor(PMSM)/primary frequency modulation/sliding mode variable structure controller
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