Abstract
This paper presents a novel hysteresis current control strategy with fuzzy bandwidth for Active Power Filter. Based on the structure of traditional hysteresis current unit of APF and with the analysis of the variation of hysteresis bandwidth, an internal fuzzy controller is designed in order to dynamically adjust the loop width of hysteresis comparator device. Compared to traditional hysteresis method, progresses are made not only in limiting the switching frequency of power switches so that protect the APF device, but also in achieving a more excellent dynamic response and precision of compensation. Finally, the harmonic compensating efficiency to the typical non-linear loads of the approach presented is further verified by the simulation and experiment results in this paper. Ill. 10, bibl. 11, tabl. 1 (in English; abstracts in English and Lithuanian). DOI: http://dx.doi.org/10.5755/j01.eee.120.4.1442
Highlights
In recent years, with the rapid growth of power electronic devices and widely use of non-linear loads, harmonic contamination and reactive power unbalance problems became more and more serious in power system, on the other hand for a long time users started to require better and better quality electric energy [1]
In traditional hysteresis method, fixed bandwidth presents changed switching frequency of device, which will bring about some problems as that, when the gap between command and sampled current signal is big, it’ll be not safe for the device working in such a high switching frequency; when the gap is small, it’ll bring down the precision of current tracking
Based on these researches, a constant switching frequency hysteresis controller is proposed in [9], whose controller differs from prior art hysteresis controllers by having a second integrator inserted in the controller loop's forward path; and a bi-directional real and reactive power control method is presented in [10], which makes switching frequency of power devices almost constant by adjusting hysteresis loop width
Summary
With the rapid growth of power electronic devices and widely use of non-linear loads, harmonic contamination and reactive power unbalance problems became more and more serious in power system, on the other hand for a long time users started to require better and better quality electric energy [1]. Based on these researches, a constant switching frequency hysteresis controller is proposed in [9], whose controller differs from prior art hysteresis controllers by having a second integrator inserted in the controller loop's forward path; and a bi-directional real and reactive power control method is presented in [10], which makes switching frequency of power devices almost constant by adjusting hysteresis loop width Both control methods above didn’t take consideration of the combination use with FACTS devices; they cannot solve the problems of dynamically tracking the distorted current or voltage and output the time-varying compensating harmonic signals, and no practical field test experiment result is illustrated to demonstrate their conclusion. This paper solves the consistent problem that switching frequency varies too severely due to fixed hysteresis bandwidth, and protects the power switches in order to ensure the APF device to operate safely
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