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Implementation method of inverse system controller of active power filter

A technology of power filter and implementation method, which is applied in harmonic reduction device, AC network to reduce harmonic/ripple, reactive power compensation, etc., can solve the problem of poor control effect, easy to cause pulse current and switching noise, switching Frequency instability and other problems, to achieve the effect of simple mathematical derivation, intuitive physical concept, and simple method

Inactive Publication Date: 2010-01-20
JIANGSU UNIV
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Problems solved by technology

Hysteresis tracking control has high precision and fast response, but the switching frequency is unstable, which is easy to cause pulse current and switching noise; triangular wave comparison control has constant switching frequency, high device safety, but slow response and low precision
In addition, the deadbeat control strategy has the advantages of strict mathematical derivation, no overshoot in tracking, and good dynamic performance, but the control effect is not good under load disturbance and nonlinear load.
As a non-linear control method, one-cycle control has duality of modulation and control at the same time. It achieves the purpose of tracking command signals through reset switches, integrators, trigger circuits, and comparators. Poor suppression of load disturbance

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  • Implementation method of inverse system controller of active power filter
  • Implementation method of inverse system controller of active power filter
  • Implementation method of inverse system controller of active power filter

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Embodiment Construction

[0031] The present invention takes the inverse system method as the theoretical basis. Compared with other nonlinear system linearization methods (such as the differential geometry method), the inverse system method has a series of characteristics such as intuitive physical concept, simple mathematical derivation, and convenient use. The software link consists of TMS320F2812 chip implementation, the specific steps are as follows:

[0032] (1) Establish the main circuit model of parallel active power filter

[0033] u dc is the DC side voltage, C is the DC measuring capacitance, L is the input inductance of the AC side, R is its equivalent resistance, u a , u b , u c is the three-phase grid voltage, i sa i sb i sc is the grid current, i ca i cb i cc is the compensation current, i La i Lb i Lc is the load current. Assuming the sum of the three-phase supply voltage u sa + u sb + u sc = 0, and according to the circuit there is i ca + i cb + i cc = 0, the switchi...

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Abstract

The invention discloses an implementation method of an inverse system controller of an active power filter, which comprises the following steps: establishing a mathematical model of parallel main circuits of the active power filter under a d-q coordinate system; decoupling two variables of current components of offset current under the d-q coordinate system; constructing a pseudo-linear system after the decoupling so as to ensure that an optimal control signal joins into the pseudo-linear system to obtain an optimal inverse system control matrix; and finally, obtaining a reference value of the offset current by carrying out coordinate transformation on detected harmonic current. The invention changes a control policy of a conventional active power filter, carries out pseudo-linear processing on a nonlinear coupled system, directly works out a switching coefficient of the main circuits during working and the working modes of devices of the main circuits, has visualized physical conception, simple mathematical deduction, small operand and higher control precision and can guarantee the energy exchange of direct current and alternating current when a load is suddenly changed.

Description

technical field [0001] The invention relates to a feedback linearization control of an active power filter, in particular to a method for realizing an inverse system controller of an active power filter. Background technique [0002] With the development of power electronics technology, there are more and more nonlinear loads in the power system, and the voltage and current harmonics generated by the nonlinear loads seriously affect the power quality in the power transmission system. Active power filter (APF, the same below), as a new type of power electronic device for controlling harmonics in the power grid, has been rapidly developed. The basic principle is to control the APF according to the detected load harmonic current component, so that it can send out an opposite harmonic current to offset, so as to achieve the purpose of real-time compensation of harmonics. [0003] The output current of the active power filter contains high-order harmonics and transient currents,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 刘国海黄从月刘颖廖志凌陈兆岭刘慧
Owner JIANGSU UNIV
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