Element Modeling and System Simulation for Power System Harmonics
|Course||Proceedings of the|
|Keywords||Waveform distortion Power system harmonics Power system simulation Harmonic Analysis|
Power system harmonic problems as early as the 1920s and 1930s caused people's attention to the 50's and 60's, due to the development of HVDC technology, published on inverter power system harmonics caused problems The large number of papers. Since the 1970s, due to the rapid development of power electronics technology, a variety of power electronic devices in power systems, industrial, transportation, and family is increasingly widespread, are becoming increasingly serious harm caused by harmonics. Countries in the world to give full attention to the harmonic problems. This paper first introduces the basic concepts of power system harmonics, the nature and main metrics, and pointed out that the arduous task and the significance of the power system harmonic studies. The combination of simulation analysis to study the power system is the inevitable result of computer technology, the rapid development and constantly updated. The second chapter, a brief description of the functions and features of the package PCFLO power system harmonic simulation analysis. Discussion of the power system harmonic analysis, the model of the system components, where applicable, as well as their advantages and disadvantages, and how to use PCFLOH analysis is the main power system harmonics in the frequency domain. This paper describes the harmonic analysis of the model divided into two categories. One is from the power system appeared on the presence of typical system components, such as generators, transformers and transmission lines. With the improvement of the manufacturing process, such equipment is no longer the main power system harmonic source in harmonic analysis can be approximated with the equivalent impedance. However, if some special operating conditions, they will still be injected into the system harmonic current, more serious, such as the transformer in the saturated zone, or harmonic analysis requires high precision are required current source equivalents. Those emerging power system equipment, such as power electronic devices. With the development of power electronics technology, they have become the main factors of the system to produce harmonic, based on a correct understanding of the characteristics of this type of equipment, the need to use a current source instead of this type of equipment, an accurate representation of the frequency characteristics . The fourth chapter lists many national and international academic organizations to develop standards and regulations that limit the power system harmonics and electrical equipment, harmonic, and highlights China's actual situation, the harmonic national standards. As an example, a 18-node distribution system with PCFLOH analysis, given its waveform distortion results. According to the analysis results, a different model for the calculation of harmonic analysis, as well as taking into account the model selection problem under different conditions and different requirements of accuracy.