| 摘要 |
PURPOSE: An output voltage controller of a three-phase inverter is provided to precisely control a three-phase output voltage of an inverter even though a load of the inverter is a non-linear load or an unequal load. CONSTITUTION: U, V, and W-phase direct current detectors(17,23,29) detect three-phase voltages of the first, second, and third filter capacitors(C1,C2,C3) and output U, V, and W-phase direct current detection voltages. U, V, and W-phase voltage comparators(18, 24,30) compare U, V, and W-phase direct current detection voltages from U, V, and W-phase direct current detectors(17,23,29) with a reference voltage to obtain an error. The first, third, and fifth proportional integration controllers(19,25,31) perform a proportional integration control with respect to the error of the U, V, and W-phase voltage comparators(18,24,30). U, V, and W-phase multipliers(20,26,32) multiply an output phase information of the first, third, and fifth proportional integration controllers(19,25,31) to obtain U, V, and W-phase reference currents. U, V, and W-phase current comparators(21,27,33) compare U, V, and W-phase reference currents obtained by the U, V, and W-phase multipliers(20,26,32) with real U, V, and W-phase currents. The second, fourth, and sixth proportional integration controllers(22,28,34) perform a proportional integration control with respect to outputs of the U, V, and W-phase current comparators(21,27,33).
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