摘要
为提高微电网的稳定性,提出一种集自适应观测技术、滑模控制方法、定频PWM技术于一体的新型定频PWM自适应滑模控制策略,可在不需要增加额外传感器/硬件电路的情况下实现对状态变量的快速跟踪和调节,便于直流微电网内微电源和负荷的扩展与即插即用,且简化了滤波器的设计难度。同时,采用非线性复合控制方法在恒功率负载突变的情况下实现对母线电压和系统稳定控制的目标。初始状态的合理选择、变切换面的设计,使得状态变量全程处于滑动模态,并且抖振现象得以减轻。在包含光伏电源、燃料电池、蓄电池、双向Buck/Boost变换器、恒功率负载与阻性负载的直流微电网仿真环境中,验证了所提控制方法的有效性。
In order to improve the stability of microgrid,a novel fixed-frequency PWM-based adaptive sliding mode control strategy is proposed,which combines the adaptive observer technology and sliding mode control method with fixed-frequency PWM-based technology. The proposed strategy is able to quickly track and regulate state variables without any additional sensors/hardware circuits,which is beneficial for the scalability and plug-play of the distributed generators and loads in DC microgrid,and can simplify the design of filters.Moreover,the nonlinear complex control method is adopted to maintain the stability of the bus voltage and the entire system under sudden changes of constant power loads. The reasonable selection of the initial state and design of the switching surface contribute to the state variables operating in sliding mode all the time,and can relieve chattering phenomenon. The DC microgrid simulation environment including photovoltaic,fuel cell,storage battery,bi-directional Buck/Boost converter,constant power load and resistance load verifies the validity of the proposed strategy.
出处
《电力自动化设备》
EI
CSCD
北大核心
2017年第12期138-143,217,共7页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(61374155)
高校博士点基金资助项目(20130073110030)~~
