Abstract
The DC voltage imbalance of a single-phase cascaded photovoltaic inverter will decrease the quality of output voltage. The general modulation method needs to add power balance control to restrain the imbalance and make the control system complicated. To address the issue, a modified Space Vector Modulation (SVM) method is presented in this paper. The modulation method combines the DC voltage control of each unit with the modulation method to achieve DC voltage control of each unit in vector selection, eliminating the need for additional power balance control, thereby simplifying the control system. The modified space vector modulation can not only make the DC voltage rapidly track the DC voltage instruction of each cell through vector selection but also ensure the quality of output voltage waveform when the DC voltage of each cell is imbalanced. The effectiveness of the modified SVM method is verified, and the simulation model has built by using MATLAB/Simulink.
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