Control method for distribution network active filtering quiescent reactive compensation

A technology of static reactive power compensation and control method, applied in active power filtering, reactive power adjustment/elimination/compensation, AC network to reduce harmonics/ripple, etc. Inaccurate, unsatisfactory compensation effect, etc., to achieve the effect of easy tracking and maintenance, reducing high-order harmonics, and rapid dynamic response

Inactive Publication Date: 2009-09-16
镇江中茂电子科技有限公司
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to propose a simple, safe and reliable distribution network in order to overcome the defects of imperfect active filter control method, i

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  • Control method for distribution network active filtering quiescent reactive compensation
  • Control method for distribution network active filtering quiescent reactive compensation
  • Control method for distribution network active filtering quiescent reactive compensation

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Example Embodiment

[0040] The entire algorithm of the present invention is implemented on the floating-point digital processor VC33, and the workflow is shown in figure 1 . The modular design of the main program includes: data calculation, dual-port RAM data reading and writing, pre-calculation, digital filter program, reference current calculation, improved deadbeat PWM calculation, effective value and average value calculation, reactive current judgment, maximum 12 modules including current judgment, fault judgment, DC bus voltage judgment, and information transmission. The specific algorithm flow of each module is as follows Figure 2-13 Shown.

[0041] The specific implementation of each part of the module is as follows:

[0042] (1) Data calculation

[0043] It is mainly to calculate and process the real-time data collected by the data acquisition system. Including system line voltage uab and ubc, system current ias, ibs, ics, device output current iac, ibc, icc, DC bus voltage udc, etc. These ...

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Abstract

The invention discloses a control method for distribution network active filtering quiescent reactive compensation. The method comprises the following steps: calculating and processing real-time data acquired by a data acquisition system; extracting a fundamental component in the acquired current data; working out a compensatory reference current by the acquired current; calculating the effective value and average value of voltages and currents; calculating the PWM duty ratio of phases in a next control cycle based on the current reference value and the actual measured value, and adding a compensation factor and dead zone control based on the deadbeat; and sending the effective value, the average value and the soft failure information to a fixed-point digital processor through a dual-ported RAM. The method has good performance and a rapid dynamic response, and can effectively reduce the burrs of an emitted current and the distortion of a crossover point, inhibit the harmonic waves in the vicinity of switching frequency, greatly reduce the higher harmonics in the vicinity of the switching frequency, and extract an instruction current precisely without the influence of systematic parameters. The modularized design of the all parts brings about a clear structure for easy tracking and maintenance.

Description

technical field [0001] The present invention relates to a new control method for active filter static var compensation of distribution network, specifically PWM (Pulse Width Modulation) control method based on improved Deadbeat (deadbeat) algorithm, and its control system consists of high-performance Digital Signal Processor (DSP) implementation. Background technique [0002] With the rapid development of power electronics technology, a large number of non-linear loads have been added to the power grid, especially the widespread use of large-capacity converter equipment, causing a large number of harmonics to be injected into the power grid, distorting the voltage and current waveforms of the power grid, and deteriorating power quality. . Harmonics have become a major public hazard to the power grid. [0003] In order to suppress grid harmonics, traditional methods use passive filters. This method has the advantages of simple structure, low equipment investment, high oper...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 陈国伟姜筱锋
Owner 镇江中茂电子科技有限公司
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