Quadrature Voltage Compensation in the Isolated Multi-Modular Converter

Series connections of modules in cascaded multilevel converters are prone to power imbalances due voltage differences on their DC side. When connected direct current (DC) sources, such as photovoltaic panels, the capability withstanding is crucial for generating maximum power. In order provide a possible solution this requirement, paper proposes control strategy called Quadrature Voltage Compensation, which allows wide range imbalances. The proposed regulates by introducing circulating between arms and phase angle output voltage. impact its effect studied. To highlight features strategy, an analytical model based vector superposition also described, demonstrating strong tolerating differences. Finally, validate effectiveness simulation experimental results presented three-phase isolated multi-modular converter.