Abstract
Nonlinear boundary control technique can offer superior dynamic behavior and eliminate the LCL-filter resonance in the grid-connected inverter. However, the chattering might be aroused by the distorted intracycle voltage information in the control law. It becomes worse when the nonlinear boundary controller is directly applied in three-phase three-wire inverter configuration. A hybrid current control scheme utilizing the decoupled predictive hysteresis capacitor current controller integrated with the linear grid current controller is proposed in the paper. By applying the 60° discontinuous pulse-width modulation scheme and using the virtual dual-buck decoupled structure, two separate sets of switching criteria for dictating the switching states of two specific half-bridge legs are formulated to avoid the interactions amongst phases. A small-signal ac model is also built to study the transfer characteristics of such hybrid current controlled inverter system. Simulation and experimental results have been offered to evaluate the effectiveness of the proposed method. Both results meet the theoretical predictions.
Highlights
Nowadays, research and development of renewable energy power generation system has been becoming urgent
The stability of dc bus voltage is to balance the input and output power, and the high-power quality injected to the grid mainly depends on the design of the power filter and the control strategy of injected current or power
Due to the demand of high-power density, applications of grid-connected inverters based on high-order LCL or LLCL power filters are preferred than the first-order L filter [2]
Summary
Research and development of renewable energy power generation system has been becoming urgent. A hybrid decoupled current control technique with no need of sensing the capacitor voltage for the threephase grid-connected inverter with an LCL filter has been proposed.
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