A parallel hybrid active filter system and its control method
A control method and passive filter technology, applied in active power filtering, AC network to reduce harmonics/ripples, reactive power adjustment/elimination/compensation, etc., can solve the problem of poor control accuracy of active filters, etc. question
Inactive Publication Date: 2017-08-22
XIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide a parallel hybrid active filter system, which solves the problem of poor control accuracy of active filters in the prior art
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[0060] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0061] A parallel hybrid active filter system of the present invention uses a voltage source inverter as its active part and a single-tuned filter as its passive part, and the active part and the single-tuned filter form a hybrid active filter device, structured as figure 1 As shown, the specific structure is: including three groups of passive filters 1 respectively connected to the AC grid 4 three-phase lines, the three groups of passive filters 1 are all connected to the active filter 2, and the AC grid 4 three-phase lines A non-linear load 3 is also connected to it, and the passive filter 1 includes a capacitor C and an inductor L sequentially connected in series to the three-phase lines of the AC grid 4 .
[0062] The voltage source inverter is regarded as an ideal voltage U c , the harmonic source is equivalent to an ideal current sour...
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The invention discloses a parallel hybrid active filtering system, and the system comprises three groups of reactive filters which are respectively connected to three phase lines of an AC power grid. The three groups of reactive filters are respectively connected to an active filter, and three phase lines of the AC power grid are also connected with a nonlinear load. Each reactive filter comprises a capacitor and an inductor, which are sequentially connected to the three phase lines of the AC power grid in a series manner. The invention also discloses a control method for the system, and the method comprises the steps: firstly building a mathematic model for the system; secondly building a linear active-disturbance-rejection control mathematic model, and building a repeated control compensation linear active-disturbance-rejection control model according to the internal model principle; and finally carrying out the control of the system through combining the repeated control compensation linear active-disturbance-rejection control model and the linear active-disturbance-rejection control mathematic model. According to the invention, a problem that the control precision of active filters in the prior art is poor is solved.
Description
technical field [0001] The invention belongs to the technical field of active filters, in particular to a parallel hybrid active filter system, and also relates to a control method for the parallel hybrid active filter. Background technique [0002] With the rapid development of power electronics technology, nonlinear power electronic devices have been widely used in modern power networks. The use of power electronic devices causes severe distortion of the grid voltage and current, which affects the quality of electric energy, so it has become the most important source of harmonics in modern industry. The parallel hybrid active filter is composed of an active filter and a passive filter in parallel. It combines the advantages of the passive filter and the active filter, and can effectively compensate the harmonics. Compared with the simple The advanced APF can reduce the cost and begin to show strong competitiveness. Today, active power filters have their own advantages fr...
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IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/20
Inventor 曾光秦丹杨波张静刚郭燕
Owner XIAN UNIV OF TECH