직류단 션트저항을 이용한 3상 SVPWM 인버터의 과변조 기법 연구 = Overmodulation Method for Space Vector PWM Inverter with DC-Link Shunt Resistor

다국어 초록 (Multilingual Abstract)

In this paper, un overmodulation method for three-phase SVPWM(Space Vector Pulse Width Modulation) voltage source inverter with dc-link shunt resistor is proposed for using in electric vehicle.
The outline of SVPWM overmodulation and phase current reconstruction are addressed before proposing overmodulation algorithm. And, the conventional phase current reconstruction methods are classified as three methods and the drawbacks of each methods in overmodulation operation are analysed. The un-implementable regions are unavoidably exist in vertices of SVPWM hexagon for phase current reconstructing. MVI-method (Measurement Vector Insertion) can have the minimized un-implementable region. Using MVI-method, proposed method can maximize the voltage utilization. Also, the proposed method classify the overmodulation region, from upper limit of linear modulation region to 12-step operation, as two modes. The boundaries of each modes are analyzed with including effects of un-implementable region. The modulation index changes of boundaries of each modes are analyzed to detect that the voltage utilization is decreased due to increase of un-implementable region. In each overmodulation range, the linearity of voltage transfer and minimizing THD(Total Harmonic Distortion) characteristic can be obtained by Fourier analysis.
The high voltage utilization and low THD characteristic of proposed method is verified through the comparison with conventional method. Also, the ability of reconstructing phase current in all overmodulation range are verified through the experimental results.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 제 2 장 SVPWM의 과변조와 전류복원 5
• 2.1 SVPWM의 과변조 5
• 2.2 직류단 션트저항을 이용한 전류복원 15
• 2.3 최소전압 주입방식과 전류복원 불가영역 23
• 제 3 장 전류복원을 이용한 과변조 기법 31
• 3.1 전류복원 불가영역의 영향 36
• 3.2 과변조 모드1 39
• 3.3 과변조 모드2 45
• 제 4 장 고조파 해석 51
• 제 5 장 실험 결과 및 검토 54
• 5.1 시스템 구성 54
• 5.2 실험 결과 58
• 제 6 장 결 론 64
• 참고 문헌 66
• Abstract 71