Phase PWM Inverter Research Articles

Micro Controller Based Ac Power Controller

This paper discusses the design and implementation of single phase PWM inverter using 8051 microcontrol-ler. The main features of 8051 based PWM inverter are simpler design, low cost, maximum range of voltage control and compact in size. The designed PWM inverter is tested on various AC loads like AC motor and intensity control of incandescent lamp in a closed loop environment.

Discrete‐time model following control of inverter with rectifier load

AbstractElectronic apparatus, such as a computer, are a capacitor input type rectifier load for the power supply. The rectifier load causes distortions of the power source voltage waveform. Copyright © 2004 Wiley Periodicals, Inc.This paper describes the output voltage characteristic of the single phase PWM inverter controlled by a discrete‐time model following method and connected to a rectifier load. First, the rectifier load model of a discrete‐time system is considered. Next, the discrete‐time model following control system used for this load is described. Then, simulation and experimental results are examined. The simulation results show that this method has robustness to the load change. The experimental system consists of an inverter controlled by a digital signal processor (DSP) and a rectifier load. Experimental results confirmed the validity of the simulation result. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(2): 72–81, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20375

整流器負荷を有するインバータの離散時間モデル追従制御

Electronic apparatus, such as a computer, are a capacitor input type rectifier load for the power supply. The rectifier load causes distortions of the power source voltage waveform. Copyright © 2004 Wiley Periodicals, Inc. This paper describes the output voltage characteristic of the single phase PWM inverter controlled by a discrete-time model following method and connected to a rectifier load. First, the rectifier load model of a discrete-time system is considered. Next, the discrete-time model following control system used for this load is described. Then, simulation and experimental results are examined. The simulation results show that this method has robustness to the load change. The experimental system consists of an inverter controlled by a digital signal processor (DSP) and a rectifier load. Experimental results confirmed the validity of the simulation result. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(2): 72–81, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20375

고조파 저감 능력을 가진 직류전철 회생인버터 시스템

본 논문에서는 전철시스템의 변전소에서 직류모선에 발생하는 잉여분의 직류전력을 교류전원 측으로 회생시킬 수 있는 직류전력 회생시스템을 제안한다. 제안된 직류 전철용 회생인버터 시스템은 인버터와 능동전력필터로 사용 할 수 있다. 회생인버터 모드에서는 전철의 감속에 의해 회생되는 에너지를 재사용 할 수 있으며, 능동전력필터 모드에서는 변전소의 정류기에 의해 발생되는 고조파 왜곡을 보상하기 위해 사용할 수 있다.<br/> 전력용량과 스위칭 손실을 고려하여 시스템은 3상 PWM 인버터를 기반으로 설계되며 병렬인버터, 출력변압기와 LCL필터로 구성된다.

Effective Improvement of DC Busline Voltage Utilization Factor in Two Switch-Auxiliary Quasi-Resonant DC Link Snubber Assisted Three Phase Voltage Source Type Soft-Switching PWM Inverter

In recent years, a resonant snubber to minimize switching power losses and EMI noises have attracted special interest for the voltage-fed soft switching sinewave PWM inverters and active rectifiers. The authors have discussed the performance evaluations on lower noise and high efficiency for two switch auxiliary resonant DC link snubber assisted three-phase voltage-fed soft switching PWM inverter. It was proved that cost effective three phase soft switching inverter treated here is able to improve both efficiency and EMI noise. However, some practical problems to be improved have recognized for the soft-switching three phase PWM inverter treated here from a practical point of view. This three phase soft-switching inverter with two switch type auxiliary resonant DC link snubber has significant disadvantages of DC busline link voltage reduction for the existence of the zero voltage mode transition period as well as the larger size and physical volume of electrolytic capacitor incorporated into the resonant DC link snubber. The additional technology to minimize the busline DC link zero voltage period in order to overcome the practical problems mentioned above is newly proposed in this paper. From experimental and simulation viewpoints, the modified version of this soft-switching inverter is discussed and evaluated for the DC busline voltage utilization factor as compared with the previously developed one.

Multi-functional PWM Inverter for Solar Power Generation System.

We propose a new multi-functional single phase PWM inverter for solar power generation system. In this case, it is important to construct the main circuit with simple circuit configuration and control. The proposed single phase inverter with an AC line switch can be constructed only by a three phase inverter module. The functions of the inverter are as follows; 1) an inverter to send the solar cell energy to the utility line, 2) a power line conditioner with an active filter and a reactive power compensator and line voltage controller at the line connecting mode. and 3) an uninterrupted power supply at the line power failer and so on. These are desirable from view points of improving the cost performances of the system.In this paper, the proposed control circuit and the principle of operation, the control functions and their control characteristics are described. Then some simulation results of the system with many functions are shown. The feasibility of the inverter system are verified by experimental results.

Multiple Single Phase PWM Inverter by means of Combination Control.

In this paper, we propose a new multi-level inverter with simple circuit configuration and control. The inverter is composed of a series connection of individual single phase inverters. The number of the output voltage levels depends on the number of the individual inverters in series and their output voltage level. The switching devices in the new circuit configuration can be reduced by using a common switching-leg for the individual inverters. In this inverter circuit, the number of the levels is equal to 2m-1 or 2m where m is the number of switching-legs used. In the paper, a 15 levels inverter using four switching legs (m=4) is introduced. If the number of voltage levels is increased, smoother sinusoidal waveforms can be obtained directly and it is possible to control the output voltage almost continuously from zero to maximum without generating high voltage step changes as pulse width modulation techniques.The control principle, the circuit configuration and the characteristics of the output voltage control are discussed. The feasibility of the circuit is demonstrated by simulation and experimental results.

Quasi-parallel resonant DC link inverterwith improved PWM capability

A quasi-parallel resonant DC-link (QPRDCL) circuit with improved PWM capability is proposed for the zero voltage switching (ZVS) three phase PWM inverter. The circuit has minimum voltage stresses and improved PWM capability due to the flexible selectability of the on/off instants of the resonant link.

Digital Control of Three Phase PWM Inverter for UPS Application based on Disturbance Observer and Deadbeat Control.

A new approach to digital feedback control of PWM inverter is proposed, in which an output DB (dead beat) control is achieved with a disturbance observer. In this scheme, the state observer and disturbance observer are used, and pole placement of these two observers are chosen separately. When these observers employ the same pole placement, the system has tendency to become unstable. By selecting the different pole placement, the disturbance observer only eliminates the disturbance, and state observer only estimates the state variable of the next sampling instant.From the view point of UPS applications, the advantages and disadvantages are discussed through simulations and experiments.

DSP based real time output waveform synthesis for three phase PWM inverter.

A new digital control technique is proposed to synthesize arbitrary three phase PWM inverter output. Sensing two line-to-line voltages, the required pulse patterns for deadbeat response are computed in real time manner, based on the predicted voltage by an observer at 18kHz sampling frequency. When used for the uninterruptible power supply, this closed loop voltage control inherently results in a very low THD and a very quick transient response with the less filter capacity. Also with repetitive compensator, the proposed scheme has advantages in improving the output waveform for non-linear load. This paper describes modeling technique, theoretical analysis, simulations and experimental results.

A Study on Harmonic Elimination Method of PWM Inverter Fed Induction Motor System Using Walsh Series

Microprocessor control of power electronics systems offers the possibility of improvements in variability, maintenance and servicing, and increased control flexibility. This paper describes the new algorithm for elimination of unwanted harmonics and control of the fundamental amplitude in the three phase PWM inverter output waveform. in other words, this paper is presented technique of the particular harmonics eiimination(PHE) by waish series in three phase PWM inverter output waveform. A microprocessor(8086 CPU) - controlled three phase induction motor system realizing this algorithm is presented. It is designed for a three output voltage in the 1~45Hz inverter with the 5th and 7th harmonics eliminated, and with the fundamental wave amplitude proportional to the output frequency. The performance of the proposed method has been greatly improved with respect to an earlier realization proposed by the authors. In the future, the proposed PWM pattern by Walsh series, is effective not only to the induction motor but also to the other electromagnetic machine such as voltage regulator, UPS.

Finite time settlement control of three phase PWM inverter.

Finite time settlement control of three phase PWM inverter.