Flexible Power Regulation and Limitation of Voltage Source Inverters under Unbalanced Grid Faults

This paper develops a flexible power regulation and limitation strategy of voltage source inverters (VSIs) under unbalanced grid faults. When the classical theory is used faults, oscillations current distortions are inevitable. In proposed strategy, extended introduced to compute feedbacks together with theory. Based on combination theory, can achieve sinusoidal provision between three common targets, i.e., constant active power, balanced current, reactive power. Meanwhile, associated limiter, which capable keep currents pre-defined threshold maximum apparent for better utilization inverter capacity. With this rated capacity fully both provisions Using limitation, VSI avoid overcurrent tripping flexibly regulate its All conclusions verified by real-time hardware-in-loop tests.