Controlling method for 3-phase output inverter

Abstract

Abstract PURPOSE:To improve the accuracy and phase deviation of an output voltage by individually detecting a voltage between lines of 3-phase AC output phases or phase voltage, and comparing them with individual reference voltages to be controller. CONSTITUTION:A 3-phase output inverter is composed of an inverter 2 for converting a DC to a 3-phase AC, an inverter transformer 3 and AC filters 4, and energizes a load 5. This controller is composed of auxiliary transformers 15a-15b for detecting RS phase, ST phase output voltages to reduce its voltage level, rectifiers 16a-16b, low pass filters 17a-17b, compensators 20a and 20b for regulating the response of a control system, and a pulse generator 21, etc. Thus, even if an unbalance occurs at the load 5 or an irregularity exists in the inductances of AC filters 4, it can prevent a voltage accuracy from being deteriorated or a phase deviation from being displaced from 120 deg.C.

Inventors

• 👤 Yasuhiko Ajikuchi
• 👤 泰彦 味口

Bibliographic Details