摘要
为抑制微网谐振及母线电压波动,进一步提高直流系统稳定性,该文提出一种计及完全降阶型混合控制算法的直流微网谐振抑制策略。其中,针对线路调节变换器输出电压进行控制,在变换器内环引入电流预测模型,提高系统动态响应速度并省去PWM调制器以及参数的整定,实现电流内环单位化;电压外环则通过构建被控对象逆模型,实现二自由度控制下电压外环单位化。母线电压完全跟随参考电压,抑制了电压传递函数中出现的谐振峰以及母线电压波动现象。最后在Matlab/Simulink平台对所提完全降阶混合控制算法进行仿真验证,结果表明该控制策略能有效抑制直流微网谐振及母线电压波动,提高微网动态特性及抗干扰能力。
In order to suppress microgrid resonance and bus voltage fluctuation and further improve system stability,a novel resonance suppression strategy based on fully reduced order hybrid control algorithm is proposed.The output voltage of LRC is controlled,and the current prediction model is introduced into the inner loop to improve the dynamic response speed of the system and eliminate the PWM modulator and parameter setting,so as to realize the unit of the inner loop of current.The inverse model of the controlled object is constructed in the outer loop to realize the unitization of the voltage outer loop under the control of two-degree-of-freedom.The bus voltage can completely follow the reference voltage and restrain the resonance peak in the voltage transfer function and the bus voltage fluctuation.Finally,the proposed fully reduced order hybrid control algorithm is simulated and verified on Matlab/Simulink platform.The results show that the proposed control strategy can effectively suppress the DC microgrid resonance and bus voltage fluctuation,and improve the dynamic characteristics and anti-interference ability of the microgrid.
作者
郑峰
吴旭东
郑宗华
梁宁
Zheng Feng;Wu Xudong;Zheng Zonghua;Liang Ning(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《太阳能学报》
EI
CAS
2024年第11期61-72,共12页
Acta Energiae Solaris Sinica
关键词
直流微网
电压控制
电路谐振
模型预测控制
二自由度控制
DC microgrid
voltage control
circuit resonance
model predictive control
two-degree-of-freedom control
