Abstract：For the three-phase three-wire multi-functional grid-connected inverters, a modified power quality compensation strategy was proposed in the paper based on conservative power theory (CPT) in two-phase stationary coordinate system. The proposed strategy can extract the compensation components of the load currents without the phase-locked loop (PLL), even when the voltages of the point of common coupling (PCC) are distorted. Then, the output-current control loop was designed based on H∞ repetitive theory to realize the load current compensation as well as the active power output control under distorted voltages. By considering the local load, the general load mode according to CPT was adopted. Thus, a stability analysis method was proposed to study the stability problem of the current control system with the H∞ repetitive controller, which is suitable for complex loads and grid-impedance scenarios. Finally, the proposed control system was tested in a hardware platform. The experimental results show that the proposed strategy can compensate the power quality problem.
靳伟, 李永丽, 卜立之, 孙广宇. 基于CPT理论和重复控制的多功能并网逆变器研究[J]. 电工技术学报, 2018, 33(18): 4345-4356.
Jin Wei, Li Yongli, Bu Lizhi, Sun Guangyu. Research on Multi-Functional Grid-Connected Inverters Based on Conservative Power Theory and Repetitive Control. Transactions of China Electrotechnical Society, 2018, 33(18): 4345-4356.
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