改進(jìn)型單位功率因數(shù)法的有源電力濾波器研究
[Abstract]:With the development of technology, more and more advanced equipments are used in power system. Most of these equipments are nonlinear and produce harmonic current, so it is necessary to take effective measures to control the harmonic of power system. There are many methods to control harmonic current. (APF) with source power filter is an ideal method, and it is widely used in practice. The main research areas are harmonic current detection, converter control and DC side voltage control. In this paper, the unit power factor method for harmonic current detection in APF is studied, and an improved method is proposed according to the requirements of practical application. In this paper, parallel APF is selected as the research object according to the present situation of the research, and the advantages and disadvantages of several common harmonic current detection methods for this type of APF are compared. According to the comparison results, the unit power factor method is selected as the harmonic current detection method, but the method is very vulnerable to the influence of the power grid distortion voltage. In this paper, an improved method is proposed. The harmonic voltage is eliminated by adaptive filter and the fundamental current is calculated after filtering the voltage. In order to reduce the steady-state error, a new variable step size algorithm is proposed. The new algorithm uses the relative error signal as the reference signal to calculate the step size factor, which is used to improve the steady-state error and adjust the step factor in real time. The simulation model of the new variable step size algorithm is built by Matlab software. The performance parameters of the new method and the traditional method are compared. The simulation results show that the new method has a good effect on eliminating harmonic voltage. It is much better than the traditional method. On this basis, the APF system is simulated. The simulation results show that the improved method can compensate the harmonic current under the condition of voltage distortion. On the basis of simulation, the hardware experiment device is built by using digital signal processor (DSP), and the software and hardware design of parallel APF is completed. The hardware design mainly involves the main circuit, drive circuit, sampling circuit and protection circuit, and some main electrical components are selected. Software design mainly involves the main program flow and harmonic detection part of the program flow.
【學(xué)位授予單位】:江南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TN713.8;TM761
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