• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.343-346
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• 2000

In most inverter/converter applications SVPWM method is the preferred approach for it shows good characteristics in linear modulation range and waveform quality. in this paper we propose a new carrier based SVPWM method for multi-level system. First we survey the conventional carrier based SVPWM method and investigate the problem of the conventional one for the multi-level system with the focus on the switching frequency harmonic flux trajectories. Finally we propose a new carrier based SVPWM method that can reduce harmonic distortion. Simulation and experimental results are given for the verification of the proposed SVPWM method.

• Journal of Power Electronics
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• 제14권5호
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• pp.926-936
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• 2014

A simplified and effective space vector pulse-width modulation (SVPWM) algorithm with two and three levels for three-phase voltage-source converters is proposed in this study. The proposed SVPWM algorithm only uses several linear calculations on three-phase modulated voltages without any complicated trigonometric calculations adopted by conventional SVPWM. This simplified SVPWM also avoids choosing the vector sector required by conventional SVPWM. A two-level overmodulation scheme is integrated into the proposed two-level SVPMW to generate the output voltage that increases from a linear region to a six-step state with a smoothly linear transition characteristic and a simple overmodulation process without a lookup table and complicated nonlinear functions. The three-level SVPWM with a proportional-integral controller effectively balances the neutral point potential of the neutral point clamped converter. Results from the simulation in MATLAB/Simulink and the experiment based on a digital signal processor are provided to clearly demonstrate the validity and effectiveness of the proposed strategies.

• 전기학회논문지
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• 제65권2호
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• pp.319-328
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• 2016

This paper proposes a simplified SVPWM for three level inverters in transformerless photovoltaic (PV) systems. With the proposed SVPWM the three level space vector (SV) diagram is divided into only six sectors as in conventional two level SV diagram in such a way that only seven SVs are used among all the available SVs of three level inverter. The main features of the proposed SVPWM are that it is simple to implement, less switching losses as compared to conventional SVPWM and most importantly it eliminates the leakage currents in transformerless PV systems. Detailed theoretical analysis of the proposed SVPWM are presented and verified by numerical simulations and experimental results.

• 조명전기설비학회논문지
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• 제23권9호
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• pp.124-129
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• 2009

최근 자동차 및 자동화 등 많은 첨단 산업분야에서 산업용 모터 정밀 제어를 위한 인버터의 요구가 증가하고 있다. 본 논문에서는 FPGA를 이용하여 단일 제어 유닛으로 여러 개의 모터를 제어할 수 있는 SVPWM 모듈을 설계 제작하여 모터 정밀제어에 응용하고자 한다. 개발된 WVPWM 모듈에는 PWM 발생기뿐만 아니라 위치 및 전류센서 처리 부분과 데프타임 보상기 알고리즘도 함께 구현되었다. 개발 툴은 ALTERA Quartus 8.0을 사용하였으며 시뮬레이션에 의해 동작 특성을 검증하였고 실험을 통해 성능을 검증하였다.

• 전기전자학회논문지
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• 제24권1호
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• pp.19-24
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• 2020

본 논문은 FPGA의 언어 중 하나인 Verilog HDL을 사용한 100 kHz 스위칭의 3-레벨, 2-레벨 SVPWM 기법을 구현에 대한 것이다. 인버터에 주로 사용되는 IGBT소자의 경우 주로 20 kHz 근방에서 스위칭 주파수를 가진다. 최근 차세대 전력 반도체 소자의 연구 개발로 100 kHz 이상의 스위칭을 구현하여 전력변환기를 소형화하고, 고조파의 주입에 따른 여러 가지 새로운 알고리즘의 적용이 가능하게 되었다. IGBT를 이용하는 기존의 시스템에서는 DSP를 이용한 제어가 이루어지는 것이 통상적이나, 100 kHz 스위칭을 위한 제어기 구성으로는 FPGA를 이용한 제어기의 적용이 요구된다. 따라서 본 논문에서는 FPGA를 사용하여 2-레벨 인버터와 3-레벨 인버터에 적용되는 SVPWM의 이론과 FPGA 구현에 대하여 설명하고 SVPWM의 출력 파형을 통해 구현 성능을 확인한다. 한편, 본 논문에서는 3-레벨 인버터에서 SVPWM 구현 시 기존의 방식에서 반송파 2개를 사용하는 방법을 대신하여 반송파 1개만을 사용하는 기법으로 3-레벨 SVPWM을 구현한다.

• 전력전자학회논문지
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• 제7권2호
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• pp.149-157
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• 2002

본 논문에서는 공간벡터 PWM(SVPWM) 인버터에서 직류단 전압을 최대로 이용하기 위한 새로운 과변조 기법을 제안한다. 제안된 기법은 영-시퀀스 신호인 옵셋 전압 주입 원리에 근거한 SVPWM의 개념을 사용하였다. 제안된 과변조 기법에서는 폴전압을 간단히 수정함으로써 과변조 영역 전반에 걸터 인버터의 출력전압을 선형적으로 제어할 수 있게 하였다. 제안된 기법은 시뮬레이션과 실험을 통하여 그 타당성을 확인하였다.

• Journal of Power Electronics
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• 제1권1호
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• pp.26-35
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• 2001

In most inverter/converter applications SVPWM method is a preferred approach since it shows good characteristics in linear modulation range and waveform quality. In this paper, we propose a new carrier based SVPWM method for multi-level system, First, we survey the conventional carrier based SVPWM method, and investigate the problem of the conventional one for the multi-level system with the focus on the switching frequency harmonic flux trajectories. Finally, we propose a new carrier based SVPWM method that can reduce harmonic distortion. Simulation and experimental results are given for verification of the proposed SVPWM method.

• Journal of Electrical Engineering and Technology
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• 제13권1호
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• pp.133-142
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• 2018

Paper presents a comparative study of space vector pulse width modulation (SVPWM) switching sequences for Voltage Source Inverters (VSIs). Various SVPWM switching sequences are studied for two and three level VSIs in linear modulation index region. The computations of dwell times are presented for two and three level VSIs based on space vector geometry in a synchronized and optimized manner. The existing SVPWM switching sequences are implemented using Matlab / Simulink and in an experimental setup for three phase two and three level VSIs. The simulation and experimental waveforms of conventional SVPWM (CSVPWM) and bus clamped SVPWM (BCSVPWM) are demonstrated for two and three level inverter respectively. The performance of different SVPWM switching sequences are evaluated and presented based on weighted voltage total harmonic distortion (THD).

• Journal of Power Electronics
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• 제19권2호
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• pp.413-430
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• 2019

This paper presents an optimum hybrid SVPWM technique for three-level voltage source inverters (VSIs). The proposed hybrid SVPWM technique aims to minimize total harmonic distortion (THD). A new parameter is introduced to incorporate the heterogeneous nature of switching sequences of SVPWM technique. The proposed hybrid SVPWM technique is implemented on a low-cost PIC microcontroller (PIC18F452) and verified experimentally with a 2 KVA three-phase three-level insulated gate bipolar transistor-based VSI. Optimum switching sequence results in the three-level inverter configuration are demonstrated. The proposed hybrid SVPWM technique improves the THD performance by 17.3% compared with the best available three-level SVPWM technique.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.35-38
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• 1998

In this paper, we present a new SVPWM strategy for a 3-level inverter. This SVPWM method is easily implemented without switching table like SVPWM. In addition, with proposed method, we can also keep the voltage balancing of DC-link capacitors and guarantee minimum on/off time of the devices. The principle of the proposed SVPWM method is described in detail, and its implementation method is also proposed. The usefulness of the proposed SVPWM method is verified through the simulation using MATLAB/Simulink.