三相不平衡電網之換流器設計與控制

Design and control of the three-phase converters in the unbalanced three-phase grid

陳宗柏(Tsung-Po Chen)

換流器 ； 三相不平衡 ； 波寬調變 ； Index terms ； converter ； three-phase unbalanced system ； PWM

亞東學報

35期（2015 / 12 / 01）

297 - 304

繁體中文

本論文先研究與分析併接於不平衡交流三相電網之換流器之波寬調變技術，藉以選擇合適之技術應用到不平衡三相電網之換流器。空間相量調變技術的線性調變範圍可達1.1547，零相序諧波為三相同時規劃較為適用。本論文實現可以輸出三相平衡／不平衡電壓的波寬調變換流器系統，以及三相不平衡之閉迴路電流控制系統。並聯之複合換流器除了可以控制正、負相序之dq 軸電壓以及電流，經由模擬與實驗結果顯示本篇論文可以應用於將再生能源系統將複數功率傳遞到電網，同時也控制複合換流器之三相不平衡輸出電流。

This paper presents the research and implement of the three-phase converter control system under unbalanced grid conditions. The well-known PWM techniques applied in the unbalanced converter control system are the sinusoidal pulse-width modulation, hysteresis current control and the space vector modulation, etc. However, the linear modulation range of the sinusoidal pulse-width modulation and hysteresis current control are only 1.0. The hysteresis current control method is limited to specific control configuration, furthermore, the current harmonics are variable and it is difficult to design the filter. The linear modulation range of the space vector modulation is up to 1.1547, and the null-vectors placement in space vector modulation converter are arranged under three-phase consideration, thus the null-vector can be cancelled in the line-to-line voltages on the unbalanced system. A generalized pulse-width modulation system and a closed looped control system are proposed for connected with three-phase unbalanced power system; the simulation results and experimental results are presented in this paper to validate the theoretical analysis, as well.

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