外文翻譯--基于 pwm 技術(shù)的電能質(zhì)量改善(英文）

1、POSTER PAPER Int. J. of Recent Trends in Engineering and Technology, Vol. 1, No. 4, Nov 2009 © 2009 ACEEE DOI: 01.IJRTET.01.04.511 99 Use of PWM Techniques for Power Quality Improvement Mahesh A. Patel1, Ankit

2、R. Patel2, Dhaval R. Vyas3 and Ketul M. Patel4 1,2,3,4 L.C. Institute of Technology, Bhandu, Mahesana, Gujarat, India mahesh21k@yahoo.com1, majorankit@gmail.com2,dhavalforever@gmail.com3, kmpatel_78@yahoo.com4 Abstrac

3、t This paper has discussed the effect of harmonics on the power quality of the power supply. The paper also discussed the different configurations of PWM techniques for harmonic reduction and improvement of fundame

4、ntal peak voltage. In addition, a comprehensive comparison of all configurations is made in terms of THD, FFT and dominating harmonics components. This paper describes the results on the basis of MATLAB simulation. I

5、t is shown how, with suitable modifications. The conventional Regular Sampled PWM technique can be simply extended to allow Harmonic Minimization and also Harmonic Elimination PWM to be closely reproduced using s

6、imple algebraic equations. This survey paper will provide the insight of trends and technology of “Power Quality Improvement using PWM Technique. Index Terms:-FET, Power Quality, PWM Techniques, THD. I. INTRODUCTION

7、 Power Quality: There is a lot of confusion on the meaning of the term ‘power quality’, not in the least because ‘power’ is used as a synonym for ‘electricity’ in American English whereas it is also the energy transpo

8、rt per unit of time. Different authors use different definitions. A consistent set of definitions is given as follows: Voltage quality is concerned with deviations of the voltage from the ideal. The ideal voltage is

9、a single frequency sine wave of constant amplitude and frequency. Current quality is the complementary term to voltage quality. It is concerned with the deviation of the current from the ideal. The ideal current is a

10、gain a single- frequency sine wave of constant amplitude and frequency, with the additional requirement that the current sine wave is in phase with the voltage sine wave. Figure 1 Waveform shape (a) voltage and current

11、 waveform for linear loads. (b) Voltage and current waveform for non linear loads(c) Waveform with symmetric harmonic component. Power quality [1] is the combination of voltage quality and current quality. Quality of

12、 supply is a combination of voltage quality and the non-technical aspects of the interaction from the power network to its customers. Quality of consumption is the complementary term to Quality of supply. 1Mahesh A.

13、Patel:- He is working as a Assistant Professor in the Dept. of Electrical Engineering at L.C. Institute of Technology, Bhandu, Mahesana. He presented more than 02 International/National Technical Papers. He is a Life Mem

14、ber of ISTE, New Delhi and Member of IETE, New Delhi. His interest includes Power Electronics SESI, New Delhi; ISOI, Bangalore; PSSI, Gandhinagar; SSI, New Delhi; and Associate Member of SPE, Baroda. His interest includ

15、es Control Techniques for PQ Improvement.3Dhaval R. Vyas:- He is working as a Lecturer in the Dept. of Electrical Engineering at L.C. Institute of Technology, Bhandu, Mahesana. He presented more than 03 International/Nat

16、ional Technical Papers. He is a Life Member of ISTE, New Delhi. His interest includes Microcontroller Application and Interfacing for the Power System. 4Ketul M. Patel:- He is working as a Lecturer in the Dept. of Elect

17、rical Engineering at L.C. Institute of Technology, Bhandu, Mahesana. He presented more than 02 International/National Technical Papers. His interest includes Instrumentation Techniques and its Application to Power System

18、. POSTER PAPER Int. J. of Recent Trends in Engineering and Technology, Vol. 1, No. 4, Nov 2009 © 2009 ACEEE DOI: 01.IJRTET.01.04.511 101 IV. SIMULATION The authors have suggested the different techniques of

19、 PWM for improving power quality. All the PWM techniques has been simulated in the MATLAB 2006 software and results of waveform and its FFT is shown in fig. 2 to 7. The different configuration of the PWM technique

20、like Multi pulse PWM, Unipolar PWM, Trapezoidal PWM, Modified PWM and Selective Harmonics Elimination Techniques. Best method out of these is found out and is modified PWM techniques. The result is shown in table 1.

21、Table 1: Comparision of PWM Techniques Parameter Peak Fundamental THD % Dominating Harmonics Square Wave 1.271Vdc 48.3 3rd, 5th, 7th Multi pulse PWM 1.23Vdc 38.5 3rd, 5th, 7th Uni polar PWM 0.866Vdc 3.

22、76 43rd and 45th Trapezoidal PWM 1.05 Vdc 38.5 3rd, 5th, 7th Selective Harmonics 1.18 Vdc 4.88 27th Modified SPWM 0.866Vdc 3.76 43rd and 45th AC PWM 1.10Vdc 22.35 19th and 21st Fig 2(a): Multi pulse

23、PWM i/p & o/p waveform Fig 2 (b): FFT of multi pulse PWM scheme Fig 3(a): Trapezoidal PWM i/p & o/p waverforms Fig 3(b): FFT of Trapezoidal PWM schemeFig 4(a): AC voltage PWM i/p & o/p waveform Fig 4 (b): FF