A Single-Input Single-Output Approach by using Minor-Loop Voltage Feedback Compensation with Modified SPWM Technique for Three-Phase AC–DC Buck Converter

Azrita Alias,Nasrudin Abd. Rahim,Mohamed Azlan Hussain 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5

The modified sinusoidal pulse-width modulation (SPWM) is one of the PWM techniques used in three-phase AC?DC buck converters. The modified SPWM works without the current sensor (the converter is current sensorless), improves production of sinusoidal AC current, enables obtainment of near-unity power factor, and controls output voltage through modulation gain (ranging from 0 to 1). The main problem of the modified SPWM is the huge starting current and voltage (during transient) that results from a large step change from the reference voltage. When the load changes, the output voltage significantly drops (through switching losses and non-ideal converter elements). The single-input single-output (SISO) approach with minor-loop voltage feedback controller presented here overcomes this problem. This approach is created on a theoretical linear model and verified by discrete-model simulation on MATLAB/Simulink. The capability and effectiveness of the SISO approach in compensating start-up current/voltage and in achieving zero steady-state error were tested for transient cases with step-changed load and step-changed reference voltage for linear and non-linear loads. Tests were done to analyze the transient performance against various controller gains. An experiment prototype was also developed for verification.

2.9V~5.6V의 넓은 입력 전압 범위를 가지는웨어러블 AMOLED용 2-채널 DC-DC 변환기 설계

이희진,김학윤,최호용 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.3

This paper proposes a 2-ch DC-DC converter with a wide-input voltage range from 2.9V~5.6V for wearableAMOLED displays. For positive voltage , a boost converter is designed using an over-charged voltage permissiblecircuit (OPC) which generates a normal output voltage even if over-input voltage is applied, and a SPWM-PWM dualmode with 3-segmented power transistors to improve efficiency at light load. For negative voltage  , a 0.5xregulated inverting charge pump is designed to increase power efficiency. The proposed DC-DC converter was designedusing a 0.18-㎛ BCDMOS process. Simulation results show that the proposed DC-DC converter generates  voltagesof 4.6 V and   voltage of -0.6V~-2.3V for input voltage of 2.9V to 5.6V. In addition, it has power efficiency of 49%~92%, output ripple voltage has less than 20 mV for load current range of 1 mA~70 mA 본 논문에서는 2.9 V ~ 5.6V의 넓은 입력 전압 범위를 가지는 웨어러블 AMOLED용 2-채널 DC-DC 변환기를 설계한다. 양전압 는 과도한 입력전압이 인가된다 하더라도 정상 출력 전압을 생성되는 OPC를 내장하고, 경부하 효율을 제고하기위한 SPWM-PWM 듀얼모드 및 파워 트랜지스터 3-분할을 적용한 부스트 변환기로 설계한다. 음전압  는 전력 효율을높이기 위해 0.5x 인버팅 차지펌프를 이용해 설계한다. 제안된 DC-DC 변환기는 0.18-㎛ BCDMOS 공정으로 설계하였다. DC-DC 변환기는 2.9V~5.6V의 입력 전압에 대해 4.6V의와 -0.6V~-2.3V의  전압을 생성한다. 또한 1mA~70mA부하전류에서 49%~92%의 전력효율과 최대 20mV의 출력 리플을 가졌다.

A Single-Input Single-Output Approach by using Minor-Loop Voltage Feedback Compensation with Modified SPWM Technique for Three-Phase AC-DC Buck Converter

Alias, Azrita,Rahim, Nasrudin Abd.,Hussain, Mohamed Azlan The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5

The modified sinusoidal pulse-width modulation (SPWM) is one of the PWM techniques used in three-phase AC-DC buck converters. The modified SPWM works without the current sensor (the converter is current sensorless), improves production of sinusoidal AC current, enables obtainment of near-unity power factor, and controls output voltage through modulation gain (ranging from 0 to 1). The main problem of the modified SPWM is the huge starting current and voltage (during transient) that results from a large step change from the reference voltage. When the load changes, the output voltage significantly drops (through switching losses and non-ideal converter elements). The single-input single-output (SISO) approach with minor-loop voltage feedback controller presented here overcomes this problem. This approach is created on a theoretical linear model and verified by discrete-model simulation on MATLAB/Simulink. The capability and effectiveness of the SISO approach in compensating start-up current/voltage and in achieving zero steady-state error were tested for transient cases with step-changed load and step-changed reference voltage for linear and non-linear loads. Tests were done to analyze the transient performance against various controller gains. An experiment prototype was also developed for verification.

A Novel Modulation Scheme and a DC-Link Voltage Balancing Control Strategy for T-Type H-Bridge Cascaded Multilevel Converters

Wang, Yue,Hu, Yaowei,Chen, Guozhu The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6

The cascaded multilevel converter is widely adopted to medium/high voltage and high power electronic applications due to the small harmonic components of the output voltage and the facilitation of modularity. In this paper, the operation principle of a T-type H-bridge topology is investigated in detail, and a carrier phase shifted pulse width modulation (CPS-PWM) based control method is proposed for this topology. Taking a virtual five-level waveform achieved by a unipolar double frequency CPS-PWM as the output object, PWM signals of the T-type H-bridge can be obtained by reverse derivation according to its switching modes. In addition, a control method for the T-type H-bridge based cascaded multilevel converter is introduced. Then a single-phase T-type H-bridge cascaded multilevel static var generator (SVG) prototype is built, and a repetitive controller based compound current control strategy is designed with the DC-link voltage balancing control scheme analyzed. Finally, simulation and experimental results validate the correctness and feasibility of the proposed modulation method and control strategy for T-type H-bridge based cascaded multilevel converters.

A Novel Modulation Scheme and a DC-Link Voltage Balancing Control Strategy for T-Type H-Bridge Cascaded Multilevel Converters

Yue Wang,Yaowei Hu,Guozhu Chen 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6

The cascaded multilevel converter is widely adopted to medium/high voltage and high power electronic applications due to the small harmonic components of the output voltage and the facilitation of modularity. In this paper, the operation principle of a T-type H-bridge topology is investigated in detail, and a carrier phase shifted pulse width modulation (CPS-PWM) based control method is proposed for this topology. Taking a virtual five-level waveform achieved by a unipolar double frequency CPS-PWM as the output object, PWM signals of the T-type H-bridge can be obtained by reverse derivation according to its switching modes. In addition, a control method for the T-type H-bridge based cascaded multilevel converter is introduced. Then a single-phase T-type H-bridge cascaded multilevel static var generator (SVG) prototype is built, and a repetitive controller based compound current control strategy is designed with the DC-link voltage balancing control scheme analyzed. Finally, simulation and experimental results validate the correctness and feasibility of the proposed modulation method and control strategy for T-type H-bridge based cascaded multilevel converters.

PTWS를 적용한 웨어러블 AMOLED용 고집적화3-채널 DC-DC 변환기 설계

전승기,이희진,최호용 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.3

본 논문에서는 PTWS 방식을 이용한 고집적화된 AMOLED용 3-채널 DC-DC 변환기의 설계한다. 양의 전압 는 경부하에서 효율을 제고하기 위해 SPWM 듀얼모드와 PTWS 방식을 적용한 부스트 변환기로 설계한다. 음의 전압   는 전력손실을 줄이기 위해 PSM 방식을 적용한 0.5x 인버팅 차지펌프를 이용해 설계하고, 추가적인 전압    는 LDO를 이용하여설계한다. 제안된 DC-DC 변환기는 0.18㎛ BCDMOS 공정을 사용하여 시뮬레이션을 한 결과 부하전류 1mA~70mA에서 전력효율 56.9%~90.2%를 가지고, 양의 전압에서 최대 5mV의 출력 리플을 가졌다. In this paper, a highly integrated 3-channel DC-DC converter is designed using power transistor width scaling(PTWS). For positive voltage,  , a boost converter is designed using the set-time variable pulse width modultaion(SPWM) dual-mode and PTWS to improve efficiency at light load. For negative voltage,   , a 0.5 x regulatedinverting charge pump is designed with pulse skipping modulation (PSM) controller to reduce power consumption, andfor an additional positive voltage,    , a LDO circuit is designed. The proposed DC-DC converter has been designedusing a 0.18㎛ BCDMOS process. Simulation results show that the proposed converter has power efficiency of 56%~90%for load current range of 1 mA~70 mA and output ripple voltage less than 5 mV at positive voltage.

데드 타임 제어기를 이용한 웨어러블 AMOLED 디스플레이용 DC-DC 부스트 변환기

김찬유,김태운,최호용 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.3

This paper proposes a DC-DC boost converter for wearable AMOLED display using dead time controller to reducedead time and improve power efficiency. Also the DC-DC boost converter adopts PWM-SPWM (set-time variablepulse width modulation) dual-mode to enhance power efficiency under light load and decrease output voltage ripple. The proposed circuit has been designed using 0.18 μm BCDMOS process. Simulation results show that the circuit haspower efficiency of 39%∼96% and output ripple voltage of 2 mV under load current range of 1 mA∼70 mA. Thepower efficiency of the proposed circuit is up to 2% higher than the previous PWM-SPWM method and up to 8%higher than only PWM method. 본 논문에서는 데드 타임을 줄여 전력 효율을 높이기 위해 데드 타임 제어기를 이용한 웨어러블 AMOLED 디스플레이용DC-DC 부스트 변환기를 제안한다. 또한, 본 변환기에서는 경부하에서 전력 효율을 높이고 출력 전압 리플을 감소시키기 위해 PWM-SPWM (set-time variable pulse width modulation) 듀얼 모드를 이용한다. 제안하는 회로는 0.18 μm BCDMOS공정을 이용하여 시뮬레이션을 한 결과 1 mA∼70 mA의 부하 전류 범위에서 39%∼96%의 전력 효율과 2 mV의 리플 전압을 가졌다. 본 회로의 전력 효율은 PWM-SPWM 방식보다 최대 2% 상승하였고, PWM 방식보다 최대 8% 상승하였다.

3상 6펄스 PWM 정류기의 D-Q 제어 기반 출력전압 제어 알고리즘 및 EMTP-RV 시뮬레이션 연구

고윤석(Yun-Seok Ko) 한국전자통신학회 2021 한국전자통신학회 논문지 Vol.16 No.1

3상 PWM 정류기에 대한 공간벡터제어 기반 전압제어방식은 스위칭 구간에 대한 스위칭 패턴을 설계해야 하기 때문에 최적한 스위칭 패턴을 설계하는데 많은 노력이 요구된다. 본 연구에서는 3상 6펄스 전압형 PWM 정류기를 위한 D-Q 제어에 기반 한 SPWM 출력전압 제어 알고리즘을 연구하였다. 출력전압제어 알고리즘에서 3상 기준신호들은 공간벡터 표시법에 기반 한 D-Q 변환으로부터 얻어지며 스위칭 패턴 대신에 SPWM 방식을 이용하여 정류기 스위칭 제어 신호들을 생성하도록 하였다. 다음으로, EMTP-RV를 이용하여 D-Q 제어 기반 SPWM 방식을 가지는 3상 6펄스 전압형 PWM 정류기를 모델링하였다. 끝으로, EMTP-RV 시뮬레이션을 통해 얻어지는 출력전압파형을 기준 값과 비교, 출력전압이 기준전압을 정확하게 추종함을 확인함으로서 D-Q 제어기반 SPWM 전압제어 알고리즘의 유효성을 확인할 수 있었다. The space vector control based voltage control method for a three-phase PWM rectifier requires a lot of effort to design an optimal switching pattern since a switching pattern for the switching section must be designed. In this study, a D-Q control based SPWM output voltage control algorithm was studied for the three-phase six-pulse CVS type rectifier. In the output voltage control algorithm, three-phase reference signals are obtained from the D-Q transformation based on the space vector representation method, instead of the switching pattern, SPWM method is used to generate rectifier switching control signals. Next, a three-phase six-pulse CVS PWM rectifier based on D-Q transformation and SPWM was modeled using EMTP-RV. Finally, the validity of the D-Q control-based SPWM voltage control algorithm was confirmed by comparing the output voltage waveform obtained through EMTP-RV simulation works with a reference value and confirming that the output voltage accurately follows the reference voltage.

Application of Fuzzy PI Control Algorithm as Stator Power Controller of a Double-Fed Induction Machine in Wind Power Generation Systems

Gyo-Bum Chung,Jaeho Choi 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.1

This paper addresses the output control of a utility-connected double-fed induction machine (DFIM) for wind power generation systems (WPGS). DFIM has a back-to-back converter to control outputs of DFIM driven by the wind turbine for WPGS. To supply commercially the power of WPGS to the grid without any problems related to power quality, the real and reactive powers (PQ) at the stator side of DFIM are strictly controlled at the required level, which in this paper is realized with the Fuzzy PI controller based on the field orientation control. For the Sinusoidal Pulse Width Modulation (SPWM) converter connected to the rotor side of DFIG to maintain the controllability of PQ at the state side of DFIM, the DC voltage of the DC link capacitor is also controlled at a certain level with the conventional Proportion-Integral (PI) controller of the real power. In addition, the power quality at the grid connected to the rotor side of DFIM through the back-to-back converter is maintained in a certain level with a PI controller of the reactive power. The controllers for the PQ at the stator side of DFIM, the DC link voltage of the back-to-back inverter and the reactive power at the grid connected to the rotor side of DFIM are designed and simulated in the PSIM program, of which the result verifies the performance of the proposed controllers.

병실 냉·난방장치용 태양 위치 추적기률 이용한 태양광 발전시스템에 관한 연구

황락훈(Hwang, Lak-Hun),나승권(Na, S.K.) 한국산학기술학회 2007 한국산학기술학회논문지 Vol.8 No.6

본 논문에서는 태양광 발전의 효율을 높이기 위하여 센서와 마이크로프로세서를 이용한 태양광 위치추적 장치를 설계하여 고정 방식의 태양광 발전과 위치 추적 방식의 태양광 발전에 대하여 비교해 보았으며, 태양전지에 대한 특성 해석과 수학적 모델링을 통한 시뮬레이션을 행하여 태양전지 특성 사양과 비교해 보았다. 또한 전력변환 시스템을 Boost 컨버터와 전압형 인버터로 구성하여 각각에 대하여 실험하였으며, Boost 컨버터 제어에서 최대 전력점 추적을 위해 일정전압 제어법을 사용하였다. 인버터의 제어에서는 SPWM(Sinusoidal Pulse Width Modulation) 제어법을 사용하여 실험하여 좋은 결과를 나타내였다. In this paper, these setting can be useful in the microprocessor and sensor that designed to improve the efficiency of the photovoltaic system the photovoltaic position tracker device, and compared the normal photovoltaic system of fixed form with the photovoltaic system of solar position tracked form. Moreover, this is compared the catalogue of solar cell module and the simulation through a mathematics modelling with the solar cell's characteristic interpreting and that is composed an power conversion system with boost converter and voltage source inverter. This device can be used to the constant voltage control method for maximum power point tracking in boost converter control. Experiment Results is shown that using a SPWM(Sinusoidal Pulse Width Modulation) control method in inverter control.