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Auto-disturbance-rejection control system and control method of three-phase unified power quality conditioner

An active disturbance rejection control and power quality technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as unsatisfactory harmonic current control effects, avoid errors, improve dynamic performance, and reduce harmonic distortion rate effect

Active Publication Date: 2017-02-01
UNIV OF JINAN
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Problems solved by technology

[0008] Although this control system has the above advantages, the experiment shows that its control effect, especially the harmonic current control effect is not ideal, it is necessary to improve the existing control method to improve the voltage and current harmonic suppression ability of the unified power quality conditioner

Method used

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  • Auto-disturbance-rejection control system and control method of three-phase unified power quality conditioner

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] The parallel side of the unified power quality conditioner can compensate the current harmonics and reactive power caused by nonlinear loads, and the series side can compensate the sag and harmonics of the grid voltage. In this design, the parallel side adopts a double closed-loop control method, which only needs to detect the voltage and current of the grid side, and does not need to detect the load current and compensation current, and does not need to extract harmonics and reactive power. The algorithm is simple, easy to implement, and more economical and reliable. . Each phase on the series side adopts a simple single voltage loop control method. Thus the three-phase unified power quality conditioner control system such as figure 1 shown.

[0046] Among them, V dc is the voltage across the DC side capacitor, V dcref is the DC side voltag...

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Abstract

The invention discloses an auto-disturbance-rejection control system and control method of a three-phase unified power quality conditioner. The process of PI control on a difference value between voltages of two ends of a DC-side capacitor and a voltage reference value is substituted by auto-disturbance-rejection control on the voltages of the two ends of the DC-side capacitor and the voltage reference value, and the auto-disturbance-rejection control is used for determining state quantity and disturbance quantity of a three-phase active power filter according to the voltages of the two ends of the DC-side capacitor and the DC-side voltage reference value and generating a control current for feedback according to the state quantity and the disturbance quantity. The auto-disturbance-rejection control adopted by the invention does not dependent on an accurate mathematical model of the system, a non-linear factor, an uncertain parameter, system external disturbance and the like which are neglected during modeling in the control process are observed by an expansion state observer and are eliminated by a feedback link, so that an error caused by the neglect of the non-linear factor can be prevented.

Description

technical field [0001] The invention relates to an active disturbance rejection control system and a control method of a three-phase unified power quality regulator. Background technique [0002] With the increasing application of non-linear loads, the problem of power grid pollution is becoming more and more serious. How to improve power quality and effectively suppress problems such as harmonics, reactive power, disturbance, and flicker in the power grid has aroused extensive attention of researchers. Many scholars and experts have carried out a large number of theoretical and experimental studies, devoted to the research and development of compensation devices to solve power quality problems. [0003] The harmonic pollution problem of power electronic devices and other harmonic sources can be solved by transforming the power electronic devices themselves or installing compensation devices. Such devices include unit power factor converters, LC passive filters, and active...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/01
CPCH02J3/00H02J3/01Y02E40/40
Inventor 宗西举史国现程新功
Owner UNIV OF JINAN
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