POWER REGULATOR FOR POWER INVERTER

摘要

A power inverter includes a regulator circuit that controls real and reactiv e power output by the inverter. The regulator measures real and reactive outpu t power by calculating x-phasor components of the inverter's voltage and curre nt output waveforms. Phasor calculation can be adapted for one or more pairs of single-phase voltages and currents. Determining the fundamental in-phase and quadrature components of output voltage and current reduces computational complexity by permitting the regulator to perform its power control processi ng largely in a dc signal domain, and enables separate real and reactive power control. The power inverter can include islanding detection logic, which exploits the ability to separately control reactive power. Exemplary islandi ng detection logic is based on determining whether changing the amount of reactive power output by the inverter induces an output frequency shift.