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An instantaneous power factor compensation control method and system

A compensation control and instantaneous power technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, harmonic reduction device, etc., can solve problems such as slow response speed

Inactive Publication Date: 2018-09-14
XUJI GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an instantaneous power factor compensation control method and system to solve the problem of slow response speed of power factor compensation control based on the fundamental wave cycle in the case of rapid load changes

Method used

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  • An instantaneous power factor compensation control method and system
  • An instantaneous power factor compensation control method and system
  • An instantaneous power factor compensation control method and system

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Experimental program
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Effect test

Embodiment 1

[0055] The instantaneous power factor compensation control system in this embodiment is as follows figure 2 As shown, it includes a load current calculation unit, a load active and reactive current calculation unit, a voltage phase-locked unit and a power factor control unit. The system calculates the load instantaneous active current component and reactive current component in real time through the load active and reactive current calculation unit to obtain the load instantaneous power factor, and calculates the instantaneous power factor control value through the power factor control unit. The specific working process of this unit is as follows:

[0056] The load current calculation unit is used to calculate the three-phase load current i according to the three-phase system current and the three-phase current output by the dynamic compensation device La i Lb i Lc , the calculation formula of the three-phase load current used is:

[0057]

[0058] where i La is the i...

Embodiment 2

[0090] In order to make up for the control error problem caused by device parameter changes, the present invention, on the basis of Embodiment 1, calculates the instantaneous value i of the three-phase reactive power compensation control quantity obtained by the power factor control unit a_qref i b_qref i c_qref self-regulating, such as image 3 As shown, on the basis of the first embodiment, the system also includes a system power and reactive current calculation unit, a self-regulation coefficient calculation unit and a self-regulation command calculation unit. The system works as follows:

[0091] The system active and reactive current calculation unit decomposes the three-phase system current into the active current component I Sp , reactive current component I Sq And the instantaneous power factor PF of the system after compensation S , the formula used is:

[0092]

[0093]

[0094] The self-adjusting coefficient calculation unit is used to calculate the inst...

Embodiment 3

[0103] In order to make the instantaneous power factor compensation control system of the present invention applicable to the occasion of voltage and current distortion, the instantaneous power factor compensation control system in this embodiment is further improved on the basis of the second embodiment, as Figure 4 As shown, the system active and reactive current calculation unit, the voltage phase-locked unit and the load active and reactive current calculation unit are all equipped with filters, which are respectively used to filter the system current, system voltage and load current before the calculation of each unit. In order to eliminate its corresponding harmonic components, the filtered system current, system voltage and load current only contain fundamental wave components. The filter adopts a low-pass filter. In this embodiment, a Butterworth low-pass filter is used. The designed cut-off frequency is the fundamental frequency, and the sampling time is the same as t...

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Abstract

The invention relates to an instantaneous power factor compensation control method and system. Current of a three-phase system and current of a compensation device are collected in real time, and three phases of load currents are obtained; the load currents are decomposed into an active current component and a reactive current component, and an load instantaneous power factor PFL is calculated; and an amplitude Iqref of a reactive control amount and an instant value iqref of a three-phase reactive control amount are calculated according to a given target power factor PFref and the load instantaneous power factor, and the instant value of the three-phase reactive control amount serves as an instant value of a three-phase current compensation control instruction of the compensation device. According to the invention, the instant active current component and the reactive current component of the load are calculated in real time to obtain the instant power factor of the load, the problem that an original algorithm is low in instantaneity and low in response speed when being used to track a rapidly changed load is solved, a power factor control unit is used to calculate the instantaneous power factor control amount directly, and the problem that a PI regulation is low in instantaneity in an original method is solved.

Description

technical field [0001] The invention relates to an instantaneous power factor compensation control method and system, and belongs to the technical field of electric reactive power compensation. Background technique [0002] The existence of reactive power in the power system will increase the capacity of equipment, increase the loss of equipment and lines, and increase the voltage drop of lines, resulting in a series of power quality problems such as voltage fluctuations and flicker, voltage sags, and equipment power utilization. . There are two main types of reactive power compensation equipment used in power transmission and distribution systems: static reactive power compensation devices and dynamic reactive power compensation devices. The static var compensation device is mainly a parallel fixed capacitor, which has a simple structure, low cost, and is easy to maintain, so it has been widely used, but it also has the disadvantage that it can only compensate inductive re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01
CPCH02J3/01H02J3/1892Y02E40/30Y02E40/40
Inventor 陈杰杨勇王振岳粟忠来赵建平周红艳成静红魏中伟孙虎云宋晓楠孙燕明王善林
Owner XUJI GRP
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