An Eigendecomposition-based dynamic characteristics design method of three-phase grid-connected inverters with considering reliability

Abstract

Power converters often suffer the disturbance from input source or load during operation. The disturbance could cause large overshoot and harmful oscillation and even make the power converter break down. In order to ensure the reliability of the converter, it is necessary to accurate design the dynamic characteristics of a power converter, namely, the settling time and the overshoot. However, there is no quantitative dynamic characteristics design method of power converters so far. In this paper, an eigendecomposition-based (ED) dynamic characteristics design method is firstly proposed for the quantitative dynamic characteristics design of power converters and is employed into a three-phase grid-connected inverter. Then, the control-parameter regions of the three-phase inverter that satisfy the indexes of the settling time and the overshoot are obtained by using the proposed ED dynamic characteristic design method. Finally, the effectiveness and correctness of the proposed ED dynamic characteristics design method is verified by circuit simulation. Therefore, this paper provides an accurate and quantitative dynamic characteristic design method for power converters, which is helpful to improve the reliability of power converters.