Study of Fuzzy Controller for Parallel-Connected DC-to-AC Inverters

• Main Author: 曾秀玲
• Other Authors: 陳添智
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/50516402988690827281

碩士 === 國立成功大學 === 工程科學系 === 88 === Switch-mode dc-to-ac inverters have been used in various types of applications. Traditionally, a bridge configuration is employed for switch-mode dc-to-ac inverters. Using a pulsewidth modulation ( PWM ) switching technique, the input dc voltage is transformed into a high-frequency pulse waveform at the bridge output. Through a filter, this high-frequency pulsed voltage is smoothed into a sinusoidal waveform. However, these traditional methods must operate with numerous switches and, as a result, the switching loss will be significantly high. This is a serious disadvantage of implementation, energy, and cost. A recently developed switch-mode dc-to-ac inverter based on a dc-to-dc converter topology is presented. Compared to a bridge-type inverter, this inverter uses a dc-to-dc converter configuration with only one switch operating at high frequency. The switching loss is significantly less and the efficiency is high. In addition, the output filtering capacitors in the dc-to-dc converter can be smaller and less expensive than the capacitor required in the bridge configuration. This control scheme is based on a self-turning fuzzy controller and a self-tuning fuzzy identifier. Consequently, the switch-mode dc-to-ac inverters have great and fast dynamic performance of output voltage tracking and current distribution even though the parameters may change. The proposed controller was implemented with a 32-bit digital signal processor TMS320C32. Simulations and experimental results demonstrate the feasibility and fast dynamic response of this control strategy.