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Method for calculating maximum reference phase-to-phase voltage of active power filter by using artificial neural network

An artificial neural network, power filter technology, applied in active power filter, AC network to reduce harmonics/ripple etc.

Inactive Publication Date: 2014-01-22
HUATIAN POWER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the technical problem of calculating the maximum reference phase-to-phase voltage of an active power filter, the present invention provides a method for calculating the maximum reference phase-to-phase voltage of an active power filter using an artificial neural network

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  • Method for calculating maximum reference phase-to-phase voltage of active power filter by using artificial neural network
  • Method for calculating maximum reference phase-to-phase voltage of active power filter by using artificial neural network
  • Method for calculating maximum reference phase-to-phase voltage of active power filter by using artificial neural network

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] 1. Detect the system voltage, because when the three-phase voltage is symmetrical, the amplitude U of the three-phase voltage synthesis vector of the system sm is the phase voltage amplitude, so only one phase voltage amplitude needs to be detected.

[0044] 2. Detect the amplitude and phase angle of several harmonic currents with large content in the load current. For the harmonic source is figure 1 For the three-phase uncontrollable rectification bridge connected resistive load shown, the order of harmonic current contained in the load current is 6n±1 (n is a positive integer), of which the 5th and 7th harmonics are relatively large, while the reference current The fundamental wave component is caused by the power exchange between the AC side and the DC side of the inverter, and the amplitude is generally not large. Theref...

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Abstract

The invention discloses a method for calculating maximum reference phase-to-phase voltage of an active power filter by using an artificial neural network. The method comprises the following steps: detecting system voltage, and calculating phase voltage amplitude Usm; detecting load current and calculating amplitude and phase angles If5m and theta 5 of quinary harmonic current and amplitude and phase angles If7m and theta 7 of septenary harmonic current; calculating the maximum reference phase-to-phase voltage by Usm, If5m, theta 5, If7m and theta 7 so as to construct a training pair of a BP (Back Propagation) neural network and train the BP neural network. After the training is finished, quick calculation can be performed by using the BP neural network according to the input quantities Usm, If5m, theta 5, If7m and theta 7. The method can be adapted to different system voltage and load current to quickly calculate the maximum reference phase-to-phase voltage, a foundation is laid for setting of a capacitive voltage instruction value on a direct current side, and programming calculation can also be performed on a digital signal processor (DSP) according to each weight value and threshold value of the trained BP neural network.

Description

technical field [0001] The invention relates to a method for calculating the maximum reference phase-to-phase voltage of an active power filter by using a neural network, and belongs to the technical field of the active power filter. Background technique [0002] With the development of power electronics technology and the improvement of residents' living standards, the power load connected to the grid is becoming more and more complex, and the harmonic pollution of the power system is becoming more and more serious. The traditional passive filter (PF) can no longer meet the needs of harmonic control due to its inherent shortcomings. At present, the active power filter (APF) has become an effective means of harmonic control, and has become a research hotspot of scholars at home and abroad. [0003] The active power filter is composed of command current operation circuit and compensation current generation circuit. The compensation current generation circuit is composed of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 李正佳
Owner HUATIAN POWER TECH