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A New 19-level PWM Inverter for the Use of Stand-alone Photovoltaic Power Generation Systems  

강필순 (오사카대학 전기공학과)
오석규 (진주산업대 메카트로닉스공학)
박성준 (전남대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers B / v.53, no.7, 2004 , pp. 452-461 More about this Journal
Abstract
A novel multilevel PWM inverter is presented for the use of stand-alone photovoltaic power generation system. In appearance, it consists of three full-bridge modules and three cascaded transformers; therefore, the configuration of the proposed multilevel PW inverter is equal to that of a prior 11-level PWM inverter. Only the turn-ratio of a transformer and its corresponding switching function are different from each other. Owing to these differences, the proposed 19-level PWM inverter has two promising advantages. First, output voltage levels increase almost twofold. Consequently, it can generate more sinusoidal output voltage waveform. Second, due to a revised switching pattern, it lightens power imposed on the transformer, which is used for compensating output voltages with chopped pulses between steps. The validity of the proposed inverter system is verified by computer-aided simulations and experimental results based on a 1 ［kW］ prototype. The performance of the proposed 19-level PWM inverter is compared with the Prior 11-level PWM inverter and other counterparts.
Keywords
cascaded transformers; multilevel PWM inverter; photovoltaic power generation system;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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