摘要
针对传统的双PI控制存在电流谐波高、系统稳定性差以及响应速度慢的不足,提出了一种基于Lyapunov函数的T型并网逆变器的控制策略。在分析T型逆变器数学模型的基础上,设计了电压电流双闭环控制回路。从稳定性角度出发,针对电流内环提出了基于Lyapunov函数的非线性控制策略,以实现谐波参考电流的快速跟踪;外环采用传统的PI控制,以实现对直流侧电容电压的跟踪;同时,将电压外环输出的d轴期望电流作为电流内环的变量输入,以提高双环的抗扰动性。最后,将提出的新型双环控制策略与传统的双PI控制策略进行了仿真比较,验证了所提策略在补偿谐波方面的优越性。
In view of the disadvantages of high current harmonics,poor system stability and slow response speed in the traditional double PI control,this paper presents a control strategy for T-type grid-connected inverter based on the Lyapunov function.On the basis of analyzing the mathematical model of T-type inverter,a voltage-current double closed loop control circuit is designed.From the point of view of stability,a nonlinear control strategy based on Lyapunov function is proposed for the inner loop of current,which realizes the fast tracking of harmonic reference current.The outer loop adopts the traditional PI control to track the capacitor voltage of DC side.Meanwhile,the d-axis expected current from the outer loop is used as the variable input of the inner loop,which improves the anti-disturbance performance of the double loop.Finally,compare the new double loop control strategy proposed with the traditional double PI control strategy in simulation,and the comparison results verify the superiority of the new double loop control strategy in harmonic compensation.
作者
程尹曼
李涛
程启明
魏霖
CHENG Yinman;LI Tao;CHENG Qiming;WEI Lin(North Power Supply Branch,Shanghai Electric Power Company,Shanghai 200041,China;School of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《上海电力学院学报》
CAS
2019年第5期435-441,共7页
Journal of Shanghai University of Electric Power
基金
国家自然科学基金(61573239)
上海市重点科技攻关计划(14110500700)
上海市电站自动化技术重点实验室项目(13DZ2273800)