摘要
针对三相并网逆变器的特点,采用一种新的无差拍电流预测控制策略。与传统不加补偿的无差拍控制器相比,可改善控制上的延时,在相同的采样频率下可使输出电流畸变减少,提高三相并网逆变器的性能。为进一步提高三相并网逆变器的可靠性和降低并网逆变器的成本,提出一种基于软件锁相环和虚拟电网磁链的无电网电压传感器的控制策略。采用虚拟的电网磁链矢量定向的矢量控制,实现了d、q轴电流的解耦控制,使q轴电流控制有功功率,d轴电流控制无功功率。将无差拍电流预测控制和无电网电压传感器控制相结合,为三相并网逆变器提供一种高性能的解决方案。最后实验验证了该方案的可行性和正确性。
A novel deadbeat predictive current control strategy was adopted according to the characteristics of three-phase grid-connected inverters. The new deadbeat predictive current controller could improve the control delay and reduce the distortion of output currents at the same sampling frequency compared with traditional deadbeat controller without compensation, which will improve the performance of the three-phase grid-connected inverter. In order to further improve reliability and reduce cost for three-phase grid-connected inverters, the paper proposed the novel control strategy without grid voltage sensors based on software phased lock loop （PLL） and virtual grid flux. The virtual grid flux vector orientation was used for the grid-connected inverter, which realizes the decoupling control for d-axis current and q-axis current. The active power and the reactive power were independently controlled by q-axis current and d-axis current. The deadbeat predictive current control strategy and the control strategy without grid voltage sensors were combined, which provide a high performance solution for three-phase grid-connected inverters. The feasibility and correctness of the control strategy are verified by experimental results at last.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第33期40-46,共7页
Proceedings of the CSEE
基金
台达环境与教育基金会<电力电子科教发展计划>资助(DRES2007002)
关键词
无差拍电流预测控制
软件锁相环
虚拟磁链
解耦控制
deadbeat predictive current control
software phase lock loop
virtual flux
decoupling control
