虛擬電阻型有源電力濾波器的研究
[Abstract]:The harmonic pollution of public power network is becoming more and more serious. Active power filter (APF) is widely used in harmonic control field because of its excellent performance. The traditional active power filter based on current detection can only compensate the local load nearby and can not absorb the harmonic current injected by other nonlinear loads in the power network. The main purpose of this paper is to study a virtual resistive active power filter, which can absorb harmonic current from power network without detecting load current. Based on virtual resistive APF, a new harmonic control strategy is proposed, which can conveniently define the user's treatment or pollution behavior, and give appropriate rewards and punishments, thus fully arousing the enthusiasm of users to control harmonics and achieving the purpose of improving power quality. In this paper, the harmonic detection method based on instantaneous reactive power theory and the harmonic detection method based on FFT are analyzed, and the PI control parameters of current loop and voltage loop are designed by establishing the mathematical model of active power filter. In this paper, a virtual resistive active power filter based on voltage detection is proposed to overcome the limitation of the traditional active power filter in the multi-harmonic source region. This kind of APF only needs to detect the harmonic voltage of the system. That is, the active harmonic resistor can absorb the harmonic current in the system and break through the limitation of traditional APF. On the basis of virtual resistive APF, a new harmonic control strategy is proposed in this paper. Virtual resistor APF can achieve the maximum harmonic power by adjusting the equivalent harmonic resistance of each order. It is advocated that the role of user polluter or controller should be defined by the emission or absorption of harmonic power, and the corresponding punishment or reward should be given to the user, thereby compensating the user for the increased cost of absorbing harmonic current of the system. Fully mobilize the enthusiasm of users to actively manage harmonics. On the basis of in-depth analysis and study of the optimal resistance value conditions under different conditions, this paper presents an automatic control method of optimal resistance value based on one-dimensional search, and aims at the situation that the system resistance is far less than the system reactance. A method of optimal resistance regulation based on system impedance calculation is proposed. The simulation results show that the virtual resistive active power filter can quickly adjust the equivalent harmonic resistance of each order to achieve the optimal resistance under the optimal resistance automatic regulation mechanism, and the harmonic voltage and harmonic current of the system can be treated significantly. An experimental system of virtual resistive active power filter based on TMS320F2812 DSP is designed. The design method of virtual resistive active power filter is introduced in detail from main circuit, control circuit, software program and so on. The experimental results further prove the function of virtual resistive active power filter in harmonic control.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TM761;TN713.8
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