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Circuits for synchronizing power converters to the three-phase utility voltages are often sensitive to voltage disturbances. Some kind of filtering device is needed. Voltage information is also important for system protection. Both voltage and frequency disturbances could be disadvantageous for the equipment. In this paper an alternative solution for improving the performance of a synchronizing circuit...
An array of solar panels is connected to the mains through a three-phase active voltage-source inverter and a step-up transformer. The inverter synchronizes to the grid by means of a robust phase-locked loop (PLL), using input's quadrate method, and a multi-variable filter removes voltage harmonics caused by unbalance and distortion. The PWM active inverter utilizes a voltage oriented control (VOC)...
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