高功率三相中性點箝位式轉換器研製

Design and Implementation of High Power Three-Phase Neutral-Point Clamped Converter

李俊毅(Chun-Yi Li)

指導教授 ： 張淵智 ； 吳財福

國立中正大學/工學院/電機工程學系/碩士(2014年)

摘要

本研究研製一部三相雙向中性點箝位式轉換器，包含市電併聯及整流功能，其電路分為電力級與控制級兩部份，在市電併聯模式中，將直流電轉換成交流電饋入市電電網；在整流模式中，將市電轉換成直流電供給直流負載。電力級電路採用中性點箝位式架構，控制級使用微控制器Renesas RX-62T來實現本研究所採用之的分切合整D-Σ控制法，透過精準電感電流變化之計算，推導責任比率控制法則，以快速修正當前的電流誤差值。此外，本論文說明元件之選擇，包括並聯使用的功率開關與蕭特基二極體，以及電感之選擇，接著推導基於分切合整控制之轉換器責任比率控制法則、直流鏈穩壓機制及中性點電容電壓平衡機制。最後以 Matlab 模擬，並實作一部高功率三相中性點箝位式轉換器來驗證分析、討論和可行性。

關鍵字

中性點箝位式 ； 高功率

並列摘要

This thesis presents design and implementation of a three-phase bi-directional neutral-point clamped converter, including two operation modes: grid-connection mode and rectification mode. The converter is divided into two parts, of which one is a power stage with neutral-point clamped configuration, the other is a control stage with a single-chip micro-controller Renesas RX-62T to realize the division-summation (D-Σ) digital control law. In grid-connection mode, power is transformed into AC and injected into the utility grid. In rectification mode, the utility power is transformed to DC and supply rectified loads. Simulated and experimental results measured from a three-phase bi-directional neutral-point clamped converter have been presented to con-firm the analysis, discussion and feasibility.

並列關鍵字

Neutral-point clamped ； High power

參考文獻

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