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  Abstract: With the development of power electronics technology, harmonic hazards has become increasingly serious, harmonic governance issues has been imminent. On the power source for electronic devices harmonic analysis and concluded that its harm and the corresponding harmonic management principles and comprehensive management, and management of a harmonic outlook.
  
  Key words: power electronics; harmonics; hazards; inhibition
  
  INTRODUCTION
  
  With the development of power electronics technology, power electronic devices to the extensive application of power system harmonics caused serious pollution. Various power electronic equipment in the transport, metallurgical, chemical and other industrial traffic the extensive application of harmonics in the grid problem is becoming increasingly serious, many low power factor of power electronic devices to the power grid additional burden on the quality of power and influence, Therefore, the power electronic devices harmonic pollution has become hinder the development of power electronics technology major obstacles. Therefore, inhibition harmonic pollution and improve the power factor of power electronics technology has become a major issue in the. This paper focus on the key issues of power through electronic harmonic sources and the danger of understanding and analysis, and control of pollution from the relationship ween the consideration of a comprehensive management approach on the final harmonic trends in the development of comprehensive management of the prospect.
  
  A power electronic device - the main source of harmonics
  
  Nonlinear load is a harmonic sources, which caused grid voltage distortion, in the voltage several times with the whole of the fundamental frequency component. Harmonic as the main source of power for various electronic devices mainly AC-DC converter (rectifiers, inverters, chopper, Drives), as well as bidirectional thyristor controlled switching equipment, as well as internal power system Variable Flow equipment, such as HVDC rectifier valve and the valve, and other inverter. Below its harmonics generated an analysis of the situation.
  
  1.1 Rectifier
  
  As a DC power supply devices, rectifiers widely used in various occasions. Figure 1 (a) and Figure 1 (b) respectively for the single-phase and three-phase circuits typical. In rectifier devices, AC power supply for the current rectangular wave, rectangular wave of the fundamental frequency for the current and Jibeiai several times for the high-frequency harmonic current waveform synthesis. Obtained by Fourier series of rectangular wave of high harmonics In fundamental component I1 and the largest ratio of 1 / n, with the trigger control angle α, and the decrease of overlap angle μ for the increase of harmonic wave components have reduced trend.
  
  In addition, the existing research results indicate that: Rectifier harmonic current operation mode of the size, has a direct impact, therefore consider adjusting the voltage and current rectifier, it is best to conduct overlap angle, as well as for harmonic phase pressure drop calculations, in order to determine safe and economical operation mode when the control close to 40 ° angle α, overlapping in the 8 ° angle μ about the circumstances are often the most serious state of harmonic, so to go through, as far as possible through the correct choice of regulating transformers tap in order to avoid Harmonic most serious point [1].
  
  1.2 exchange regulator
  
  Exchange regulator used for lighting dimming and induction motor speed, and so on. Figure 2 (a) and 2 (b) respectively for the single-phase and three-phase circuits typical. Exchange regulator and the harmonic frequency rectifier basically the same.
  
  Frequency Converter 1.3
  
  Frequency converter is AC / AC Converter behalf of equipment, when used as mot

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