CN108777468A - A kind of multi-functional intensive DC de-icing device - Google Patents
A kind of multi-functional intensive DC de-icing device Download PDFInfo
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- CN108777468A CN108777468A CN201810654388.5A CN201810654388A CN108777468A CN 108777468 A CN108777468 A CN 108777468A CN 201810654388 A CN201810654388 A CN 201810654388A CN 108777468 A CN108777468 A CN 108777468A
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- ice
- melt
- phase
- uncontrollable rectifier
- voltage generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of multi-functional intensive DC de-icing devices, to improve utilization ratio of device and comprehensive cost performance.The present invention includes three-phase filter reactance, quiescent voltage generator, shorting switch, three-phase uncontrollable rectifier device.Wherein the filtered reactance in quiescent voltage generator one end is connected to power grid, and the other end is connected to the exchange input side of three-phase uncontrollable rectifier device；Shorting switch is connected in parallel between the three-phase of three-phase uncontrollable rectifier device exchange input side.When needing ice-melt, shorting switch is disconnected, controls the output voltage of quiescent voltage generator to continuously adjust the AC-input voltage of three-phase uncontrollable rectifier device, and then control output ice-melt voltage and current；When not needing ice-melt, it is closed ice-melt switch, quiescent voltage generator is made to be run as SVG.The present invention is by cheap uncontrollable rectifier device and the good SVG complementary combinations of technical indicator so that DC de-icing device allomeric function is more, cost is moderate, synthesis is cost-effective.
Description
Technical field
The present invention relates to de-icing technology fields, and in particular to a kind of multi-functional intensive DC de-icing device.
Background technology
China's ice disaster takes place frequently, and broken string bar is easily caused after powerline ice-covering, seriously threatens the safety fortune of power grid
Row and power supply reliability.For this purpose, developing various types of DC de-icing devices both at home and abroad, combat a natural disaster to provide technology hand for power grid
Section.According to structural principle, existing DC de-icing device can be divided mainly into three classes：
The first kind is the uncontrollable rectifier type DC de-icing device based on diode, Chinese as disclosed in 20 days Mays in 2009
Patent of invention CN200810031940.1 etc..Such device is simple in structure, cost is relatively low；But output voltage cannot continuously adjust and
Controllability is poor, to enable same deicing device to meet the ice-melt demand of a plurality of different length, line footpath transmission line of electricity, needs to configure
More and depth pressure regulating the ice-melt transformer with numbers of gear steps；And such deicing device only has the function of ice-melt and is difficult to expand
Exhibition, utilization ratio of device are relatively low.
Second class is the phase control rectifier type DC de-icing device based on thyristor, Chinese as disclosed in 3 days December in 2008
Patent of invention CN200810047959.5 etc..It is continuously adjustable that such device exports ice-melt voltage, and has both DC ice melting and idle
Two kinds of functions are compensated, utilization ratio of device is higher；But the grid-connected harmonic wave of Thyristor Controlled rectification is big, needs the filtering of mating multigroup large capacity
Capacity reactance device group could meet grid-connected harmonic requirement, integrally take up a large area, cost height.
The third is to utilize the full-controlled rectifier type DC de-icing device of the turn-off devices such as IGBT, such as on October 17th, 2012
Disclosed Chinese invention patent CN201210211925.1 etc..Such device can be with DC ice melting, reactive-load compensation, active filter
The multiple functions such as wave, grid-connected harmonic wave is small and ice-melt voltage is continuously adjustable, and technical indicator is good；But its current transformer rated voltage electric current needs
It is chosen according to maximum ice melting current and maximum working voltage, causes Converter Capacity to be much larger than ice-melt capacity, due to IGBT etc.
The cost of full-controlled switch device unit capacity is far above diode or thyristor so that the overall cost of such deicing device
It is high, it is difficult to promote and apply.
In addition to this,《Have both the novel deicing device of reactive-load compensation and active power filtering function》(high-voltage technology, 2016
7th phase) and Chinese invention patent 201510138254.4 propose STATCOM being parallel-connected to three-phase uncontrollable rectifier device and melt
The structure of ice transformer realizes ice-melt using three-phase uncontrollable rectifier device+ice-melt transformer, and is multiplexed ice-melt transformer conduct
The filter reactance of STATCOM has the function of ice-melt, reactive-load compensation and active power filtering, and STATCOM capacity to make device integrally
It can independent optimization configuration with ice-melt capacity.But its STATCOM current transformer independently of each other cannot be simultaneously with three-phase uncontrollable rectifier device
Work, i.e., STATCOM components cannot participate in DC ice melting.This aspect so that the capacity of three-phase uncontrollable rectifier device need to be according to maximum
Ice-melt capacity configuration, and need ice-melt transformer that multiple gears are arranged to adapt to different circuits because ice-melt output voltage is discontinuous
Ice-melt demand；On the other hand, which can not provide dynamic passive compensation and active power filtering function during ice-melt, i.e. its ice-melt
Function and no-power compensation function can only timesharing input and cannot get both simultaneously.
Document《Novel modularized more level DC deicing devices》(paper publishing in《Automation of Electric Systems》2013
16 phases) a kind of scheme carrying out ice-melt using SVG is proposed, by regulating and controlling the neutral point voltage of two star chain link formula SVG come real
Existing DC ice melting, ice-melt and reactive-load compensation can be run simultaneously, and technical performance is excellent.But due to the every phase bridge of converting link under which
Ac-side current and DC current can be flowed through in arm simultaneously, and also includes that power grid phase voltage and direct current are defeated in bridge arm output voltage
Go out voltage, causes Converter Capacity that can be much larger than ice-melt output capacity, calculated according to analysis, which is at least ice-melt
2.9 times of output capacity, i.e. SVG Converter Capacities utilization rate lead to that Converter Capacity is big, cost is high, economy only proximate to 1/3
Difference.
Invention content
Present invention aims at open one kind with the multiple functions such as reactive-load compensation and ice-melt and full-controlled rectifier device capacity
Smaller intensive DC de-icing device, to improve utilization ratio of device and comprehensive cost performance.
To achieve the above object, the invention discloses a kind of multi-functional intensive DC de-icing devices, including three-phase filtering
Reactance, quiescent voltage generator, shorting switch, three-phase uncontrollable rectifier device.Wherein quiescent voltage generator includes three-phase, per phase one
It is connected to power grid after holding filtered reactance, the other end is connected to the exchange input side of three-phase uncontrollable rectifier bridge；Shorting switch is in parallel
Between the three-phase that diode rectifier bridge exchanges input side, the DC output side of diode rectifier bridge is as DC de-icing device
Export positive and negative anodes.When needing ice-melt, disconnecting shorting switch makes full-controlled rectifier device group connect with three-phase uncontrollable rectifier device group, controls
Full-controlled rectifier device output voltage exports to continuously adjust the AC-input voltage of three-phase uncontrollable rectifier device and then control DC ice melting
Voltage and current；When not needing ice-melt, being closed ice-melt switch makes quiescent voltage generator be run as SVG, carries out reactive-load compensation
Or active power filtering.
Preferably, above-mentioned shorting switch is made of two single-phase disconnecting links between being serially connected in adjacent two-phase.
Preferably, each of above-mentioned quiescent voltage generator mutually respectively includes the concatenated H bridge power units of at least two groups.
The operation principle of above-mentioned apparatus is：
In ice-melt, quiescent voltage generator and uncontrollable rectifier device series operation, due to the output of quiescent voltage generator
Voltage can freely be adjusted in the range of no more than its peak value, and the output voltage by controlling quiescent voltage generator can be indirect
The AC input voltage of three-phase uncontrollable rectifier device is controlled, and then adjusts the DC output voltage amplitude etc. of three-phase uncontrollable rectifier device
The voltage needed for ice-melt, to realize the continuous regulation and control to ice-melt voltage and current.And occurred by Proper Match quiescent voltage
The amplitude and phase of device, can make its output voltage and sense of current substantially vertical, and the quiescent voltage generator does not absorb at this time
Active power or from power grid absorb it is a small amount of it is active compensate oneself power consumption, so as to maintain internal dc voltage to stablize.
When not needing ice-melt, short switch is closed, and quiescent voltage generator can be equivalent to the SVG that a three-phase star connects,
So as to carry out reactive-load compensation and active power filtering.
Compared with other similar topological structure devices, the present invention is with DC ice melting, reactive-load compensation and active power filtering
Under function, also have the advantages that：
1, control Converter Capacity is small entirely.Full-control type rectifier in the device only has quiescent voltage generator, maximum defeated
It is identical as ice-melt output power to go out power, i.e., deicing device maximum output ice-melt power is equal to full-control type current transformer rated capacity,
Relative to the simple DC ice melting mode for realizing ice-melt by SVG, greatly reduce full-control type rectifier capacity requirement and its
Cost, to be conducive to reduce apparatus cost, improve economy.
2, ice-melt characteristic is good.DC side ice-melt output voltage electric current can be continuously adjusted by quiescent voltage generator, so as to
More easily match the ice-melt demand of different circuits；And in ice-melt, device can still be provided to power grid certain capacitive reactive power or
Inductive reactive power.
3, by both cheap three-phase uncontrollable rectifier device and the good SVG of technical indicator complementary combinations so that direct current melts
Ice production apparatus overall technology index is good, vdiverse in function, cost is moderate, synthesis is cost-effective.
Below with reference to accompanying drawings, the present invention is described in further detail.
Description of the drawings
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 carries the topology diagram of multi-functional intensive DC de-icing device for the present invention.
Fig. 2 carries equivalent simplified model of the multi-functional intensive DC de-icing device in ice-melt for the present invention；
Fig. 3 carries voltage and current polar plot of the multi-functional intensive DC de-icing device in ice-melt for the present invention.
Specific implementation mode
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment 1
The present embodiment discloses a kind of multi-functional intensive DC de-icing device, as shown in Figure 1, including：
Three-phase filter reactance 1, quiescent voltage generator 2, shorting switch 3, three-phase uncontrollable rectifier device 4；Wherein, quiescent voltage
The filtered reactance in generator one end is connected to power grid, and the other end is connected to the exchange input side of three-phase uncontrollable rectifier device；Short circuit is opened
It closes and is connected in parallel between the three-phase of three-phase uncontrollable rectifier device exchange input side；When needing ice-melt, shorting switch is disconnected, control is static
The output voltage of voltage generator continuously adjusts the AC-input voltage of three-phase uncontrollable rectifier device, and then controls output ice-melt electricity
Current voltage；When not needing ice-melt, it is closed ice-melt switch, quiescent voltage generator is made to be run as SVG.
The operation principle of Fig. 1 shown devices is：
In ice-melt, quiescent voltage generator and uncontrollable rectifier device series operation, due to the output of quiescent voltage generator
Voltage can freely be adjusted in the range of no more than its peak value, and the output voltage by controlling quiescent voltage generator can be indirect
The AC input voltage of three-phase uncontrollable rectifier device is controlled, and then adjusts the DC output voltage amplitude etc. of three-phase uncontrollable rectifier device
The voltage needed for ice-melt, to realize the continuous regulation and control to ice-melt voltage and current.And occurred by Proper Match quiescent voltage
The amplitude and phase of device, can make its output voltage and sense of current substantially vertical, and the quiescent voltage generator does not absorb at this time
Active power or from power grid absorb it is a small amount of it is active compensate oneself power consumption, so as to maintain internal dc voltage to stablize.
When not needing ice-melt, short switch is closed, and quiescent voltage generator can be equivalent to the SVG that a three-phase star connects,
So as to carry out reactive-load compensation and active power filtering.
Wherein three-phase uncontrollable rectifier device and the rated voltage of quiescent voltage generator design all in accordance with grid entry point rated voltage,
The rated output DC current of three-phase uncontrollable rectifier device is according to the maximum ice melting current design for waiting for DC ice-melting, according to diode six
Voltage-current relationship between Pulses Rectifier exchange side and DC side can calculate its specified AC input current, and by the electric current
Rated current as quiescent voltage generator.The rated current for connecting reactance is also identical as quiescent voltage generator.Other ginsengs
Number can be designed according to the design method of typical SVG connections reactance.
Such as：If topological structure of the present invention accesses 10kV power grids, quasi- to be with the maximum ice melting current needed for icing circuit
2500A, maximum ice-melt voltage are 12.5V, and thus deducing can derive that three-phase uncontrollable rectifier device exchange side input maximum current is
2000A.According to above-mentioned condition parameter, quiescent voltage generator rated voltage 10kV, rated current 2000A, specified appearance can be chosen
Measure 34.6Mvar；Three-phase uncontrollable rectifier device nominal parameter is：Input 10kV/2000A, output 12.5kV/2500A, rated capacity
31.3MW.Full-control type Converter Capacity 34.6Mvar is substantially suitable with ice-melt rated output power 31.25MW.
In ice-melt, quiescent voltage generator and uncontrollable rectifier device series operation, equivalent simplified model is as shown in Fig. 2, logical
Cross control quiescent voltage generator output voltage can indirect control three-phase uncontrollable rectifier device AC input voltage, to
Realize the continuous regulation and control to ice-melt voltage and current.And by the amplitude and phase of Proper Match quiescent voltage generator, it can make
Its output voltage and sense of current are substantially vertical, as shown in figure 3, the quiescent voltage generator can not absorb active power at this time
Or from power grid absorb it is a small amount of it is active compensate oneself power consumption, so as to maintain internal dc voltage to stablize.
When not needing ice-melt, short switch is closed, and quiescent voltage generator can be equivalent to the SVG that a three-phase star connects,
So as to carry out reactive-load compensation and active power filtering.
To sum up, the multi-functional intensive DC de-icing device disclosed in the various embodiments described above of the present invention, with direct current
Under ice-melt, reactive-load compensation and active power filtering function, also have the advantages that：
1, control Converter Capacity is small entirely.Full-control type rectifier in the device only has quiescent voltage generator, maximum defeated
It is identical as ice-melt output power to go out power, i.e., deicing device maximum output ice-melt power is equal to full-control type current transformer rated capacity,
Relative to the simple DC ice melting mode for realizing ice-melt by SVG, greatly reduce full-control type rectifier capacity requirement and its
Cost, to be conducive to reduce apparatus cost, improve economy.
2, ice-melt characteristic is good.DC side ice-melt output voltage electric current can be continuously adjusted by quiescent voltage generator, so as to
More easily match the ice-melt demand of different circuits；And in ice-melt, device can still be provided to power grid certain capacitive reactive power or
Inductive reactive power.
3, by both cheap three-phase uncontrollable rectifier device and the good SVG of technical indicator complementary combinations so that direct current melts
Ice production apparatus overall technology index is good, vdiverse in function, cost is moderate, synthesis is cost-effective.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of multi-functional intensive DC de-icing device, which is characterized in that including：Three-phase filter reactance, quiescent voltage occur
Device, shorting switch, three-phase uncontrollable rectifier device；Wherein, the filtered reactance in quiescent voltage generator one end is connected to power grid, the other end
It is connected to the exchange input side of three-phase uncontrollable rectifier device；Shorting switch is connected in parallel on the three-phase of three-phase uncontrollable rectifier device exchange input side
Between；When needing ice-melt, shorting switch is disconnected, the output voltage of control quiescent voltage generator is not controlled to continuously adjust three-phase
The AC-input voltage of rectifier, and then control output ice-melt voltage and current；When not needing ice-melt, it is closed ice-melt switch, is made
Quiescent voltage generator is run as SVG.
2. multi-functional intensive DC de-icing device according to claim 1, which is characterized in that the quiescent voltage occurs
The each of device mutually respectively includes the concatenated H bridge power units of at least two groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810654388.5A CN108777468B (en) | 2018-06-22 | 2018-06-22 | Multifunctional intensive direct-current ice melting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810654388.5A CN108777468B (en) | 2018-06-22 | 2018-06-22 | Multifunctional intensive direct-current ice melting device |
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| CN108777468B CN108777468B (en) | 2021-03-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768269A (en) * | 2019-12-03 | 2020-02-07 | 西安西电电力系统有限公司 | Static synchronous compensation device and control method thereof |
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| DE60023364D1 (en) * | 2000-11-14 | 2006-03-02 | Hydro Quebec | APPARATUS AND METHOD FOR COMMUTING TO CHANGE THE IMPEDANCE OF A PHASE LADDER OF A HIGH VOLTAGE LINE |
| RU2365011C2 (en) * | 2007-06-20 | 2009-08-20 | Пётр Афанасьевич Киреев | High-voltage circuit |
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