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Sagging fuzzy adaptive PI control method for DC-side voltage of active power filter

A DC side voltage and power filter technology, applied in active power filtering, AC network voltage adjustment, AC network to reduce harmonics/ripples, etc., can solve the problem of difficult to achieve the integration of APF active power loss and compensation performance Optimization, the effect is not obvious, not considered, etc.

Inactive Publication Date: 2017-02-15
JIANGSU UNIV
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Problems solved by technology

This method can improve the APF compensation performance, but the effect is not obvious, because the relationship between the APF DC side voltage, power loss and compensation capability is not considered, and it is difficult to realize the APF active power loss and APF with a given reference value of the DC side voltage. Comprehensive optimization of compensation performance

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  • Sagging fuzzy adaptive PI control method for DC-side voltage of active power filter
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Embodiment Construction

[0023] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0024] 1) figure 1 It is a single-phase parallel APF topology. The single-phase parallel APF topology is composed of a voltage source inverter and an L-shaped filter inductor; the load part adopts a single-phase uncontrolled rectification circuit. Among them, U dc is the DC side voltage, L c is the filter inductance, u s is the single-phase power supply voltage, L and R are the load inductance and resistance respectively, i s i l and i c They are grid current, load current and compensation current respectively.

[0025] 2) figure 2 It is a functional block diagram...

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Abstract

The invention discloses a sagging fuzzy adaptive PI control method for the DC-side voltage of an active power filter (APF). According to the method, a voltage us and a current is of a single-phase circuit are used to obtain a three-phase voltage uabc and a three-phase current iabc; Park transformation is carried out on the three-phase voltage uabc and the three-phase current iabc to obtain a two-phase voltage ualphabeta and a two-phase current ialphabeta in a static coordinate; the two-phase voltage ualphabeta and the two-phase current ialphabeta are used to obtain an instant active power p and an instant reactive power q via power calculation; and a reference value Uref of the DC-side voltage is obtained via a sagging controller. The obtained reference value Uref of the DC-side voltage is compared with a DC-side voltage Udc detected in real time, a comparison value is adjusted via a fuzzy adaptive PI controller, and an ideal compensation active current value deltaip is obtained. The method can be used to ensure high stability of the DC-side voltage in the working process of the APF, has advantages including high response speed and low overshoot, optimizes the active power consumption and compensation performance of the APF in an integrated manner, and satisfies requirements for DC-side voltage control.

Description

technical field [0001] The invention belongs to the technical field of power filtering, and more specifically relates to a DC side voltage control method of a single-phase parallel active power filter. Background technique [0002] In recent years, with the development of power electronics technology, a large number of nonlinear loads are put into the power system, which makes the harmonic pollution more and more serious. Since Active Power Filter (APF) can effectively compensate harmonics, it has attracted in-depth research by scholars at home and abroad. The topological structure and control strategy of the main circuit are the main factors affecting the compensation effect of APF. The actual APF is a double-closed-loop control system with the current as the inner loop and the DC side voltage as the outer loop; among them, the outer loop control system composed of the DC side voltage has an important influence on the compensation effect of the APF. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/12
CPCH02J3/01H02J3/12Y02E40/20
Inventor 李自成张宝山刘国海许德志陈兆岭沈跃徐松赵文祥朱孝勇吉敬华
Owner JIANGSU UNIV
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