Research On Intelligent Power System Monitoring And Reactive Power Compensation System

In the rapid development of modern society, power is one of the most widely used energy, and the application level becomes one main symbol of a country’s level of development. The voltage provided by ideal common electrical net should be fixed with a single sinusoidal frequency (50Hz) and have the required voltage amplitude (nominal voltage). As high-power electrical appliances and the growing popularity of automated systems, nonlinear load of power systems increases significantly. When the power system works, the nonlinear load joins high harmonics to the power, which results in distortion of voltage and current waveform and makes the power quality bad. The power supply efficiency has been greatly reduced because of the existence of large harmonic and reactive current, which is seriously affecting the safe and economical operation of the equipment; hence, it is necessary to deal with the tram power grid harmonics.Traditional passive compensating equipments cannot meet the demand for quickly compensation to reactive and harmonics. While Active Power Filter (APF) is an ideal compensation scheme, which can compensate the harmonics and reactive power whose size and frequency often change. The purpose of this study is to develop APF for harmonics treatment and reactive compensation.In this paper, the intelligent active power filter is based on a high-performance DSP chip TMS320F2812 which is the control core of the system, and supplemented by external signal acquisition module, IPM module, as well as its drive module, and LC resonant filter unit etc... APF collects the electrical information-voltage and current signals firstly, then puts the information into DSP control core for data processing and producing control signals, finishing the monitoring of the electrical net and harmonic and reactive compensation finally. At the same time, the operating parameters of electrical information will be displayed on the LCD; users can use the keyboard to control system and watch relative information. The modules of fault alarm and communication ensure the safety and reliability when the system works.This paper first discusses the background of this study, the current research and research significance. The second chapter discusses the working principle of the APF in detail and explains the harmonic current detection and compensation current control methods. The technology of voltage space vector SVPWM is also provided as a very important part. Then, the third chapter describes the system hardware which is composed of different modules, and gives solution to the module problems encountered in the design process. Based on the platform of CCS 3.1, Chapter IV provides the detailed software design with a focus on the realization of SVPWM modulation algorithm. In chapter V, the experiment results are showed and analyzed. The final chapter, Chapter VI, is a summary of the text, and put forth suggestions for further research directions.