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Development of a solar power conditioner using diode-clamped linear amplifiers without any ac inductor nor EMI filter

Research Project

Project/Area Number 18560271
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 電力工学・電気機器工学
Research InstitutionTokyo Institute of Technology

Principal Investigator

FUJITA Hideaki  Tokyo Institute of Technology, Graduate School of Engineering, Associate Professor (40238580)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsLinear Amplifier / Inverters / Diode-Clamping Circuit / Solar Power Generation / Conversion Efficiency / 線形増幅
Research Abstract

The aim of this project is to develop a solar-power conditioner without using any ac inductor or EMI filter by using diode-clamped linear amplifiers as the main power circuit The diode-clamped linear amplifier consists of series-connected MOSFETs, the source terminal of which is damped by dc-voltage levels. This configuration is similar to diode-clamped multi-level inverters. A general-used diode-clamped multi-level inverter uses only n-channel devices in general. On the other hand, the diode-clamped linear amplifier, however, uses complimentary power MOSFETs, p-channel and n-channel devices, as the power devices. The diode-damped linear amplifier makes it possible to provide a sinusoidal output voltage to the ac loads without any ac inductors or filter, just like a conventional linear amplifier. One of the series-connected MOSFETs acts in an active-state of the operating region. The other MOSFETs work in on-states or off-states, resulting in a great reduction of the power loss caused by the operation in the active -state.
This project has developed a new current control method and current control circuit for the diode-clamped linear amplifier at first. Principle and performance have been verified by experiments using twelve-series diode-clamped linear amplifier. As a result, the developed circuit showed an accurate current control performance and a low current ripple under both normal load condition and a short-circuit condition. Next, the developed circuit has been implemented into a single-phase 200-V 2-kW prototype of an ac utility-interfaced solar power conditioner using two twelve-series diode-clamped linear amplifiers and a dc-voltage balancer. The experimental verified a current total harmonic distortion as low as 2% and power conversion efficiency as high as 90%. Moreover, a three-phase prototype also examined and demonstrated 93% conversion efficiency.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report

URL: 

Published: 2006-04-01   Modified: 2016-04-21  

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