摘要
针对三相并网逆变器的特点,在dq旋转坐标系下,提出了一种模型电流预测控制方法。在每一个采样周期,根据预测模型,对三相并网逆变器的8个电压矢量进行在线评估,使价值函数最小的电压矢量在下一个采样周期应用,实现了对d轴和q轴给定电流的快速跟踪。同时采用电网电压定向的矢量控制策略,实现d轴电流和q轴电流解耦控制,使d轴电流控制并网逆变器的有功功率,q轴电流控制并网逆变器的无功功率。实验结果表明:采用模型电流预测控制的三相并网逆变器有很好的静、动态特性。从而验证了该方案的可行性和正确性。
A model current predictive control is proposed in the dq rotating coordinates according to the characteristics of three-phase grid-connected inverters.At each sampling interval,the eight voltage vectors for three-phase connected inverters are evaluated on line based on predictive model and the voltage vector that makes the cost function smallest will be applied in the next sampling period,which achieves fast tracking for the given d-axis and q-axis currents.The vector control under grid voltage orientation is used,which realizes the decoupling control for the d-axis current and the q-axis current.The active power and the reactive power are independently controlled by the d-axis current and the q-axis current.Experimental results show that the three-phase connected inverter using model current predictive control has a good static and dynamic performance.So the feasibility and correctness for the control strategy are verified.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第6期153-159,共7页
Transactions of China Electrotechnical Society
基金
上海市重点攻关项目(10KJD480004)
上海市节能减排科技支撑项目(09dz1202500)
关键词
模型电流预测控制
旋转坐标
价值函数
电网电压定向
解耦控制
Model current predictive control
rotating coordinates
cost function
grid voltage orientation
decoupling control
