CN203071579U

CN203071579U - SVG (Static Var Generator) control system specially used for low-voltage double-bus double-segment wiring

Info

Publication number: CN203071579U
Application number: CN2012207395982U
Authority: CN
Inventors: 李瑜
Original assignee: Anhui Tipworld Electrical Technology Co ltd
Current assignee: Anhui Onesky Power Quality Tech Co ltd
Priority date: 2012-12-28
Filing date: 2012-12-28
Publication date: 2013-07-17
Anticipated expiration: 2022-12-28

Abstract

The utility model provides a SVG (Static Var Generator) control system specially used for low-voltage double-bus double-segment wiring. The bus at the T1 output end is connected with an isolation switch QS1 and then passes through current transformers CT1 and CT3; the CT1 and the CT3 acquire first bus current signals and are respectively connected onto an acquisition module AD1 of a reactive power compensation device SVG1 and an acquisition module AD3 of a reactive power compensation device SVG2. The bus at the T2 output end is connected with an isolation switch QS2 and then passes through current transformers CT2 and CT4; the CT2 and the CT4 acquire second bus current signals and are respectively connected onto an acquisition module AD2 of the SVG2 and an acquisition module AD4 of the SVG1. A first nonlinear load and the SVG1 are connected with the first bus through which the CT1 and the CT3 pass, a second nonlinear load and the SVG2 are connected with the second bus through which the CT2 and the CT4 pass, the first bus through which the CT1 and the CT3 pass is connected with the second bus through which the CT2 and the CT4 pass via a bus coupler switch QF1, and the on-off state signal line of the QF1 is connected with the reactive power compensation controllers of the SVG1 and the SVG2. The SVG (Static Var Generator) control system specially used for low-voltage double-bus double-segment wiring has the advantages that reactive current of the system is tracked in real time and compensated, and the SVG proper compensation in other branches can be prevented from being influenced due to abnormity of single-side system.

Description

The special-purpose SVG control system of the two segmentation wiring of a kind of low pressure double-bus

Technical field

The utility model relates to a kind of control system, specifically is a kind of SVG control system.

Background technology

Along with non-linear electrical equipment in the electric power system, the particularly increasingly extensive application of the power electronic equipment that power factor is lower, cause needs to consume a large amount of reactive powers, bring extra burden to electrical network, have a strong impact on the power supply quality of electrical network, therefore in order to improve power factor, improve user's the electricity quality of using, in low-tension transformer and large-scale electric equipment side that power factor is lower dynamic passive compensation generating means SVG(Static Var Generator, static reacance generator need be installed).SVG is a kind of device of quick adjustment reactive power, successfully is applied in the compensation of impact loads such as metallurgy, mining and electric railway.Consider the restriction of SVG capacity and the factors such as development cost height of big capacity SVG, actual user scene needs to adopt many SVG independent operating in parallel more.If certain section bus breaks down, to cause the loop of the about half of this bus bar side to have a power failure, the SVG of this bus bar side and load all can't be worked, can influence the operate as normal of other branch roads SVG simultaneously, big power station and transformer station are very high to the requirement of powered operation reliability and flexibility, must be noted that the coverage of avoiding bus-bar system fault and restriction busbar fault, prevent the generation of power outage on a large scale.

The utility model content

The technical problems to be solved in the utility model is to overcome under the situation of existing a plurality of SVG control device parallel connection, when the break down a kind of control that influences the normal effectively work of other branch road SVG and propose of a certain road bus simple, the two segmentation wiring special use of low pressure double-bus easy to use SVG control system.

The utility model solves the problems of the technologies described above by the following technical solutions: the special-purpose SVG control system of the two segmentation wiring of a kind of low pressure double-bus, comprise first, second bus, first, second transformer, first, second isolating switch, first, second, the 3rd, the 4th current transformer, bus connection switch, first, second reactive power compensator, described first, has idle compensating control in second reactive power compensator respectively, the idle compensating control of described first reactive power compensator comprises first acquisition module, standby the 4th acquisition module, the idle compensating control of described second reactive power compensator comprises second acquisition module, standby the 3rd acquisition module, first bus of three-phase power electrical network is connected with first transformer, the first transformer output bus with pass first current transformer respectively after first isolating switch is connected, the 3rd current transformer, first current transformer, the 3rd Current Transformer Secondary side is connected respectively to first acquisition module of first reactive power compensator, the 3rd acquisition module of second reactive power compensator; Second bus of three-phase power electrical network is connected with second transformer, the second transformer output bus with pass second current transformer, the 4th current transformer respectively after second isolating switch is connected, second current transformer, the 4th Current Transformer Secondary side are connected respectively to second acquisition module of second reactive power compensator, the 4th acquisition module of first reactive power compensator; First nonlinear load, first reactive power compensator is connected to and passes first current transformer, on the bus of the 3rd current transformer, second nonlinear load, second reactive power compensator is connected to and passes second current transformer, on the bus of the 4th current transformer, pass first current transformer, the bus of the 3rd current transformer with pass second current transformer, connect by bus connection switch between the bus of the 4th current transformer, the on off operating mode holding wire of bus connection switch is connected respectively to the idle compensating control of first reactive power compensator, on the idle compensating control of second reactive power compensator.

Advantage of the present utility model is: one, and enable the collection of alternate channel data and can avoid one-sided system to cause this side data to gather and to control unusually; Its two, adopt the special-purpose SVG control system of the two segmentation wiring of low pressure double-bus not only can real-time tracking, reactive current and the harmonic wave of bucking-out system, improve power factor (PF) and use electricity quality; Can also in time recover fault side operate as normal by bus connection switch, avoid the operate as normal of other branch road SVG control device is exerted an influence, have quite high power supply reliability and flexibility, The whole control system is simple in structure, practical, the reliability height, disposal ability is strong, and is applied widely, and tangible economic benefit is arranged.

Description of drawings

Below in conjunction with accompanying drawing optimal way of the present utility model is described in further detail.

Fig. 1 is the basic structure schematic diagram of the special-purpose SVG control system of the two segmentation wiring of a kind of low pressure double-bus of the utility model.

Embodiment

Referring to Fig. 1, the special-purpose SVG control system of the two segmentation wiring of a kind of low pressure double-bus of the utility model comprises bus 1, bus 2, transformer T1, transformer T2, isolating switch QS1, isolating switch QS2, current transformer CT1, current transformer CT2, current transformer CT3, current transformer CT4, bus connection switch QF1, reactive power compensator SVG1, reactive power compensator SVG2.Has idle compensating control respectively among described reactive power compensator SVG1, the reactive power compensator SVG2, the idle compensating control of described reactive power compensator SVG1 comprises acquisition module AD1, standby acquisition module AD4, and the idle compensating control of described reactive power compensator SVG2 comprises acquisition module AD2, standby acquisition module AD3.

The bus 1 of three-phase power electrical network is connected with transformer T1, transformer T1 output bus with pass current transformer CT1, CT3 after isolating switch QS1 is connected, current transformer CT1, CT3 gather bus 1 current signal and are connected respectively to the standby acquisition module AD3 of acquisition module AD1, the reactive power compensator SVG2 of reactive power compensator SVG1; Transformer T2 output bus with pass current transformer CT2, CT4 after isolating switch QS2 is connected, current transformer CT2, CT4 gather bus 4 current signals and are connected respectively to the standby acquisition module AD4 of acquisition module AD2, the reactive power compensator SVG1 of reactive power compensator SVG2; Nonlinear load 1, reactive power compensator SVG1 and the bus 1 that passes CT1, CT3 are connected, nonlinear load 2, reactive power compensator SVG2 and the bus 2 that passes CT2, CT4 are connected, the bus 1 that passes CT1, CT3 is connected by bus connection switch QF1 with the bus 2 that passes CT2, CT4, and the on off operating mode holding wire of bus connection switch is connected with the idle compensating control of reactive power compensator SVG1, the idle compensating control of reactive power compensator SVG2 simultaneously.

During use, reactive power compensator SVG1, SVG2 gather the current signal of current transformer CT1, CT2, CT3, CT4 secondary side respectively by acquisition module AD1, AD2, AD3, the AD4 of inner idle compensating control, and the current signal that acquisition module AD1, AD2, AD3, AD4 collect carried out analytical calculation, produce the reactive-current compensation grid power factor.Reactive power compensator SVG1, SVG2 gather the on off operating mode of bus connection switch in real time by inner idle compensating control.

When bus 1 side distribution transformer T1 and bus 2 side distribution transformer T2 normally move, isolating switch QS1, QS2 closure, if the state of bus connection switch is for disconnecting, then reactive power compensator SVG1 only carries out analytical calculation to the data of acquisition module AD1, and produce corresponding idle and harmonic wave compensating non-linear load 1, reactive power compensator SVG2 only carries out analytical calculation to the data of acquisition module AD2, and produces corresponding idle and harmonic wave compensating non-linear load 2; If the state of bus connection switch is closed, then reactive power compensator SVG1 carries out analytical calculation to the data of acquisition module AD1, AD4 simultaneously, and produce corresponding reactive power compensation nonlinear load 1, reactive power compensator SVG2 carries out analytical calculation to the data of acquisition module AD2, AD3 simultaneously, and produces corresponding reactive power compensation nonlinear load 2;

When bus 1 side distribution transformer T1 operation is broken down, isolating switch QS1 disconnects, the bus connection switch closure, CT1, CT3 lost efficacy, the current signal identification fault that reactive power compensator SVG1 gathers by AD1, automatically enable standby acquisition channel 2, gather the data of bus 2 side CT4 by acquisition module AD4, and data are carried out analyzing and processing, produce corresponding idle and harmonic wave compensating non-linear load 1, reactive power compensator SVG2 passes through the data that acquisition module AD2 gathers CT2, and data are carried out analyzing and processing, produces corresponding idle and harmonic wave compensating non-linear load 2.When bus 2 side distribution transformer T2 operation is broken down, isolating switch QS2 disconnects, the bus connection switch closure, CT2, CT4 lost efficacy, the current signal identification fault that reactive power compensator SVG2 gathers by AD2, automatically enable standby acquisition channel 1, gather the data of bus 1 side CT3 by acquisition module AD3, and data are carried out analyzing and processing, produce corresponding idle and harmonic wave compensating non-linear load 2, reactive power compensator SVG1 passes through the data that acquisition module AD1 gathers CT1, and data are carried out analyzing and processing, produces corresponding idle and harmonic wave compensating non-linear load 1.

Obviously, those skilled in the art can carry out various changes and modification to low pressure double bus scheme SVG control system of the present utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.

Claims

1. the special-purpose SVG control system of the two segmentation wiring of a low pressure double-bus, it is characterized in that: comprise first, second bus, first, second transformer, first, second isolating switch, bus connection switch, first, second, the 3rd, the 4th current transformer, first, second reactive power compensator, described first, has idle compensating control in second reactive power compensator respectively, the idle compensating control of described first reactive power compensator comprises first acquisition module, standby the 4th acquisition module, the idle compensating control of described second reactive power compensator comprises second acquisition module, standby the 3rd acquisition module, first bus of three-phase power electrical network is connected with first transformer, the first transformer output bus with pass first current transformer respectively after first isolating switch is connected, the 3rd current transformer, first current transformer, the 3rd Current Transformer Secondary side is connected respectively to first acquisition module of first reactive power compensator, the 3rd acquisition module of second reactive power compensator; Second bus of three-phase power electrical network is connected with second transformer, the second transformer output bus with pass second current transformer, the 4th current transformer respectively after second isolating switch is connected, second current transformer, the 4th Current Transformer Secondary side are connected respectively to second acquisition module of second reactive power compensator, the 4th acquisition module of first reactive power compensator; First nonlinear load, first reactive power compensator are connected on the bus that passes first current transformer, the 3rd current transformer, second nonlinear load, second reactive power compensator are connected on the bus that passes second current transformer, the 4th current transformer, are connected by bus connection switch between the bus that passes first current transformer, the 3rd current transformer and the bus that passes second current transformer, the 4th current transformer; The on off operating mode holding wire of bus connection switch is connected respectively on the idle compensating control of idle compensating control, second reactive power compensator of first reactive power compensator.