混合有源濾波器控制策略研究
[Abstract]:With the wide application of power electronic equipment, the harmonic problem in power system is becoming more and more serious. The hybrid active power filter (HAPF) can realize the real-time tracking and dynamic treatment of harmonic current. At the same time, it has the advantages of low cost of passive filter (PF) and good (APF) performance of active filter. It is of great significance to study the control strategy of hybrid active power filter (HAPF) to ensure the filtering effect and to give full play to the advantages of APF and passive filter. Four main topologies of hybrid active power filter (HAPF) are analyzed. Among them, APF and PF inductors with shunt structure have good topology advantages and better comprehensive performance. The existing control strategies of the hybrid active power filter (HAPF), such as proportional control, active tuning control, generalized integral control and generalized Pi control, are analyzed, and a control strategy based on output voltage correction is proposed. This method has the advantages of stable control, high harmonic filtering efficiency, little influence by background harmonics and simple parameter selection, which overcomes the shortcomings of existing control strategies. In order to control the effective value of APF output harmonic current, based on the control strategy based on voltage correction, the control strategy based on output current correction is put forward, and the control link of APF output current is added to the control. The effective value of APF output harmonic current is controlled effectively. In order to reduce the fundamental current output from APF, a DC side voltage control method based on power control is proposed. Under the condition that APF absorbs the same fundamental active power, the fundamental current output of APF is minimized and the APF capacity is further reduced. According to the calculation characteristics of the APF output voltage reference value in the proposed harmonic control method and DC side voltage control method, the sliding window DFT method is chosen as the detection method of the residual harmonic current and the fundamental voltage of the system. On this basis, two specific methods of calculating the output voltage reference value of APF are given, which are triangulation and iterative operation, and the effectiveness of the above method is verified by simulation. In this paper, the problems of APF and PF inductor shunt hybrid active power filter (HAPF) are analyzed, and the problems of short time harmonic amplification and DC side voltage control are analyzed, and the solution of combined operation with 5 times passive filter is put forward. It is pointed out that the fundamental current of APF can be reduced by properly increasing the quality factor of the passive filter, and the simulation results show that the combined operation with the 5 order passive filter with smaller capacity can effectively reduce the 5 th harmonic short time amplification and realize the stable control of the voltage. Improving the quality factor of the passive filter can effectively reduce the fundamental current of APF.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TN713.8;TM761
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