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An unbalanced control strategy is proposed to eliminate the 2nd harmonic at the DC bus, based on a compound synchronous reference frame phase-locked loop (CSRF-PLL) system, which composed of a T/4 delay positive sequence PLL (PS-PLL) and a T/3&T/6 delay negative sequence PLL (NS-PLL). The proposed PLL system can detect the phase angle and frequency of the utility voltage without errors, and both...
LCL filter offers a better choice of attenuating switching frequency harmonics, since compared with L or LC filters the value of required inductance is smaller. But LCL filter may cause resonance which is a disaster for the systempsilas stability. In order to solve the problem, a two-current-loop control strategy which includes grid-current outer loop and filter-capacitor-current inner loop is used...
In inverters, distortions of output sine voltages caused by factors like dead-times of power switches can be well compensated by instantaneous voltages and/or currents feedback regulators such as PID or repetitive controllers. However, in our experiments, we found that the dead-time differences between inverters would result in significant harmonic circulating currents, and instantaneous regulators...
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