Optimal Control Strategy of Back-to-Back Converter Based on AC/DC Voltage Source Converter

The back-to-back converter is a system composed of two voltage source converters (VSC). Because VSC can regulate the output active and reactive power, has good dynamic static performance. However, not all passive loads are three-phase symmetrical. existing control strategy may lead to asymmetric when used supply unbalance load. Usually, an inner loop d/q decoupling controller, constant DC controller rectifier side, AC inverter side established. In this article, in order improve fuzzy online self-tuning increase PI parameters on outer loop. replaced by PR current improved reduce overshoot harmonics. For will be imbalanced. Therefore, using control, which track sinusoidal signal without steady-state error, changed into “outer control-inner control.” This solve problem output. simulation results show that effectively.