摘要
为缓解实际应用场合中不平衡非线性负载对三相逆变器输出电压的影响,并改善混合负载切换时的动态特性,本文提出了基于广义状态空间平均的建模方法和电感电流滑动平均的控制策略。通过广义状态空间平均法对平衡负载下的逆变器进行了准确的建模,并在dq0坐标系下设计了PI控制器,最后利用电感电流滑动平均方法使PI控制器适于三相不平衡负载和非线性负载。与传统控制方法的对比实验表明,本文提出的模型和控制策略能够在保证混合负载下三相电压平衡的基础上,较好地提高负载切换时的动态特性。
In order to diminish the influence of unbalanced and nonlinear loads on the output voltage quality of three-phase inverter in practical applications and further improve the dynamic characteristic under different load switching, modeling method based on generalized state space average and a novel control strategy based on inductor current moving average are proposed. Based on generalized state space averaging method, an accurate model of inverter with balanced load and design of PI controller in the dq0 synchronous rotating coordinate is analyzed in detail. Moreover, inductor current moving averaging method is presented, adjusting the PI controller applicable to three-phase unbalanced and nonlinear loads. Compared with conventional method, the proposed model and control strategy can preferably improve dynamic characteristics under different load switching. Moreover, it can guarantee the balance of three-phase voltages with mixed loads.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第18期83-95,共13页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51177149)
浙江省重点科技创新团队项目(2010R50021)资助
