基于DSP的并聯(lián)型三電平有源電力濾波器的研究
[Abstract]:With the wide application of power electronic devices, the harmonic problem of power system becomes more and more serious, and harmonic becomes the main factor that affects the power quality. Active power filter (APF) is recognized as the most effective means to control harmonic and reactive power pollution and improve power quality. It has the characteristics of fast response speed, high compensation accuracy, small size and high intelligence. It has been put into practical application abroad. The research of active power filter in China is still in the beginning stage. This project is to design a low-voltage shunt three-level active power filter with compensation capacity of 50A in cooperation with Shandong Biya Science and Technology Co., Ltd. In this paper, the basic principle of shunt active power filter is introduced, and the main circuit topology of diode clamped inverter circuit is selected, which can reduce the voltage value of power device and increase the equivalent switching frequency. Improve the quality of output waveform and other advantages. Multilevel technology has become the application trend of active power filter (APF). The harmonic current detection method and current tracking control method are the key to the good compensation performance of active power filter (APF). This paper introduces two detection algorithms: one based on sliding window iterative discrete Fourier transform and the other based on instantaneous reactive power theory. The two methods have their own advantages and disadvantages and are suitable for different applications and compensation requirements. Through simulation and analysis of various control methods, this design determines that the selected current tracking control method is a combined control algorithm of deadbeat current control and space vector PWM modulation. This paper focuses on the basic principles of the beat free control algorithm based on periodic prediction and the space vector PWM algorithm based on 60 擄coordinate system. The design of the main circuit and its parameters is one of the key points in the practical product design of the active power filter, which can directly affect the actual compensation effect of the active power filter. In this paper, the main circuit of three-level shunt active power filter is studied, including inverter circuit, buffer circuit, high frequency filter circuit, charging circuit and EMI filter circuit. There is no universal method to calculate the main parameters of the main circuit. In this paper, the main circuit mathematical model of the three-level active power filter is established, and the DC bus voltage is determined by the combination of theoretical analysis and simulation verification. DC bus energy storage capacitance and AC side output inductance parameters. The control system is the core of active power filter, which directly affects its compensation performance and function. In this paper, the realization scheme of full digital control system based on digital signal processor (TMS320F28335) is adopted, and the hardware circuit and software design of the control system are studied. The hardware circuit of the control system mainly includes power supply circuit, signal detection and conditioning circuit, hardware protection circuit, IGBT drive circuit and RS485 communication circuit, etc. The software design of the control system includes the design of the main program and the interrupt program. In this paper, combined with the algorithm and control strategy of the selected detector, the system simulation model is established in MATLAB/Simulink environment to simulate the start-up and operation of APF, and the effect of main circuit parameters on the compensation effect is verified by simulation. Determine the relevant parameters. Combining the main circuit simulation model and the detection and control algorithm simulation model, the whole system simulation of shunt active power filter is realized, which provides the analysis basis for further system design.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TM761;TN713.8
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