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Feedback linearization sliding-mode control method of three-phase three-wire system shunt active power filter

A feedback linearization, source filter technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve problems such as limiting the application of parallel active filters and the inapplicability of reference power current calculation methods. , to achieve good dynamic and static characteristics, excellent harmonic compensation effect, and low harmonic content requirements.

Inactive Publication Date: 2015-01-21
HOHAI UNIV CHANGZHOU
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Problems solved by technology

In the actual power grid operation process, the power supply voltage often contains a certain amount of harmonics, which makes the traditional calculation method of reference power supply current unsuitable, thus limiting the application of parallel active filters

Method used

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  • Feedback linearization sliding-mode control method of three-phase three-wire system shunt active power filter
  • Feedback linearization sliding-mode control method of three-phase three-wire system shunt active power filter
  • Feedback linearization sliding-mode control method of three-phase three-wire system shunt active power filter

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] The structure diagram of the three-phase three-wire parallel active filter system is as follows: figure 1 shown.

[0033] Three-phase symmetrical supply voltage selection (V Sp cos(wt), V Sp cos(wt-2π / 3), V Sp cos(wt-4π / 3)), compensation circuit resistance (R ca , R cb , R cc ), compensation circuit inductance (L ca , L cb , L cc ), the DC capacitance is C dc , supply current (i Sa ,i Sb ,i Sc ), load current (i La ,i Lb ,i Lc ), compensation current (i ca ,i cb ,i cc ) and shunt active filter access point voltage (V cona ,V conb ,V conc ), the DC side voltage is V dc ;

[0034] The load current, power supply current, and active filter access point voltage are subjected to synchronous coordinate transformation, and the transformation formula is as follows:

[0035] v ...

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Abstract

The invention discloses a feedback linearization sliding-mode control method of a three-phase three-wire system shunt active power filter. According to the control system, an indirect current control method is adopted, and reference supply current is selected as a reference signal for current tracking control. The feedback linearization technology is used for controlling direct current-side voltage of the shunt active power filter. An integral position tracking sliding-mode control is used for tracking control of the reference signal. The problem that the computing method of a sinusoidal signal in traditional unit is inapplicable in case that the harmonic content of the power voltage is higher is solved. According to the feedback linearization control method, the control of the direct current-side voltage is realized, and the system has good dynamic and static characteristics and possesses good adaptability to variation in load. With the adoption of an integral position tracking sliding-mode controller, the harmonic content of the power current after being compensated can be effectively reduced, and the harmonic compensation effect of the active filter can be improved. The whole control system of the active filter is simple in structure and easy to realize, and has good theoretical and practical significance.

Description

technical field [0001] The patent of the present invention belongs to the technical field of active power filter, and in particular relates to a feedback linearization sliding mode control method of an active power filter. Background technique [0002] With the rapid development of power electronics technology, the proportion of non-linear loads in the power grid is increasing, and the power quality problems of power systems are becoming more and more serious. The so-called power quality problems refer to problems such as low grid power factor, waveform distortion, surge, and phase distortion caused by the connection of nonlinear loads in the power system. The power quality problem seriously affects the safe and stable operation of the power system and affects the safety of users' electricity consumption. Shunt Active Power Filter (SAPF—Shunt Active Power Filter) is an effective device for compensating harmonic current in the circuit, and has been paid attention to by peopl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 费峻涛李天华戴卫力
Owner HOHAI UNIV CHANGZHOU
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