CN107248720A - Intensive DC de-icing device and its control method with cogeneration function - Google Patents
Intensive DC de-icing device and its control method with cogeneration function Download PDFInfo
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- CN107248720A CN107248720A CN201710701899.3A CN201710701899A CN107248720A CN 107248720 A CN107248720 A CN 107248720A CN 201710701899 A CN201710701899 A CN 201710701899A CN 107248720 A CN107248720 A CN 107248720A
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- Prior art keywords
- intensive
- icing device
- icing
- generating set
- reactive
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Classifications
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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
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
Abstract
The invention discloses a kind of intensive DC de-icing device with cogeneration function and its control method, system includes intensive DC de-icing device body, medium heat-exchange device, expansion unit, condensate recycling device, generating set and net-connected controller, medium heat-exchange device and expansion unit, condensate recycling device formation hot working fluid closed circulation, the control end of generating set is connected with net-connected controller, and the output end of generating set is connected with AC network；Method includes the state based on intensive DC de-icing device and the reactive power progress cutting-in control of output.The present invention can be to reactive-load compensation in intensive DC de-icing device and the waste heat recovery produced by active power filtering branch road, and the waste heat of recovery is converted into electric energy be connected to the grid, improve energy utilization rate, deicing device thermal pollution is reduced, to realizing that energy-saving and emission-reduction, development Environmental Protection Strategy are significant.
Description
Technical field
The present invention relates to electrical engineering, and in particular to a kind of intensive DC de-icing device with cogeneration function and
Its control method.
Background technology
DC ice melting is that power network resists the most directly effective means of freezing rain and snow disaster, in the winter time icing phase powerful guarantee
The safe and stable operation of bulk power grid.But the DC de-icing device universal functionality structure of early stage is single, only have ice-melt function and only
Used in the winter time during line ice coating, cause utilization ratio of device extremely low, be chronically at idle state.Intensive DC de-icing device is
Have dynamic no-power compensation function concurrently on the basis of DC ice melting, can generally use SVG or SVC structures, therefore device can be
The non-icing phase carries out dynamic passive compensation to power network, drastically increases utilization ratio of device.But reactive-load compensation part is by a large amount of
Controllable semiconductor device is constituted, and needs frequently to cut-off when carrying out reactive-load compensation, huge heat waste can be produced during long-play
Consumption.The partial heat is generally emitted into the external world by the air-cooled or water-cooling heat radiating system of respective design, to ensure device normal table
Operation.
Home and abroad minority colleges and universities and R＆D institution be mostly device to the research work that intensive DC de-icing device is carried out
Functional structure design, parameters simulation are calculated and control algolithm optimizes etc., the rare report recycled on device by utilizing waste heat.And show
In truth condition, exemplified by having SVG type DC de-icing devices concurrently, capacity is 100MVA device, and thermal losses is reachable under rated power
300kW, if being 5628 hours by annual use time under device rated power, amounts to and produces heat 6*109kJ.Pass through meter
Calculation can find that thermal losses of the intensive deicing device under dynamic passive compensation pattern produced by longtime running is huge, if not right
The partial heat is recycled, then causes very big energy waste, thermal pollution is caused to environment.It is therefore desirable to intensive
Thermal losses produced by type DC de-icing device is recycled.This patent is directed to the spy for having SVG type DC de-icing devices concurrently
Point, with reference to transformer station's functional requirement, devises intensive DC de-icing device low-temperature waste heat power generation system, can effective solving device
The irretrievable problem of heat produced by longtime running, realizes energy-saving and emission-reduction, protects environment, with important society and warp
Ji value.
The content of the invention
The technical problem to be solved in the present invention is：For the above mentioned problem of prior art, there is provided a kind of plant running economy
Property it is good, reduce device loss, the waste for avoiding the energy, the voltage that sends can occur dynamic change can not meet it is grid-connected will
Seek, can be widely used in the intensive DC de-icing device with cogeneration function and its control method of all kinds of transformer stations.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
On the one hand, the present invention provides a kind of intensive DC de-icing device with cogeneration function, including with high-power
The intensive DC de-icing device body of cooling system, in addition to medium heat-exchange device, expansion unit, condensate recycling device,
Generating set and net-connected controller, the medium heat-exchange device include separate two-way hot switching path, and heat is handed over all the way
Change passage be connected with the thermal fluid loop interface of high-power heat-dissipation system, another road hot switching path successively with expansion unit, cold
Solidifying retracting device formation hot working fluid closed circulation, the control end of the generating set is connected with net-connected controller, the hair
The output end of group of motors is connected with AC network, and the generating set includes dc generator and inversion unit, the expanding machine
The output shaft of group is connected with dc generator, and the output end of the dc generator passes sequentially through inversion unit and AC network phase
Even.
Preferably, the generating set also includes energy-storage units, and the output end of the dc generator passes sequentially through energy storage
Unit, inversion unit are connected with AC network.
Preferably, the hot working fluid is R601a organic working mediums, R601 organic working mediums, R134a organic working mediums, R290 organic
Working medium, the single substance in R1270 organic working mediums or two or more mixtures.
Preferably, the intensive DC de-icing device body includes the constant impedance low-loss company of access 35kV ac bus
Connect and be also associated with operational mode converting means on transformer and capacitor and reactor group, the constant impedance low-loss connection transformer
Put, the operational mode conversion equipment is then connected to ice-melt branch road and reactive-load compensation and active power filtering branch road, the ice-melt
Branch road includes low harmony wave DC ice melting voltage conversion unit and DC ice-melting switching device, the reactive-load compensation and active power filtering branch
Road then includes two static reactives and active power filtering part being arranged in parallel, and two static reactives and active power filtering
High-power heat-dissipation system is connected with part.
On the other hand, the present invention also provides a kind of control of the foregoing intensive DC de-icing device with cogeneration function
Method processed, implementation steps include：
1）The mode of operation of the intensive DC de-icing device body of detection, if intensive DC de-icing device body is operated in nothing
Work(compensation model, then redirect execution step 2）；Otherwise, execution step 1 is redirected）Continue to detect；
2）The reactive power of the output of the intensive DC de-icing device of net-connected controller detection；
3）Net-connected controller is according to the exciting current of dc generator in the Reactive Power Control generating set of output so that direct current
The output voltage amplitude of generator keeps constant not influenceed by the reactive power change that intensive DC de-icing device is exported,
The electricity that the switch off time and frequency of wholly-controled device in the inversion unit of net-connected controller control simultaneously export dc generator
Pressure is converted to the three-phase alternating current with AC network same frequency same-phase.
Preferably, step 3）The switch off time of wholly-controled device and also include during frequency in middle net-connected controller inversion unit
Locking strategy, detailed step includes：The high-power heat-dissipation working state of system of the intensive DC de-icing device of detection in real time, if
There is exception in intensive DC de-icing device, then locking inversion unit, so as to disconnect the connection of generating set and AC network.
Intensive DC de-icing device tool of the present invention with cogeneration function has the advantage that：
1st, intensive DC de-icing device of the present invention with cogeneration function can be to intensive DC de-icing device in nothing
The huge thermal losses that long-play is produced under work(compensation model is recycled, sent by low-temperature waste heat power generation system and
The alternating current of system same frequency rate same-phase, improve the performance driving economy of device, reduces device loss, it is to avoid the wave of the energy
Take.
2nd, the reactive-load compensation branch road of intensive DC de-icing device can be according to reactive power distribution situation in station to exporting idle work(
Realization dynamic compensation is adjusted in rate.And the waste heat produced by intensive DC de-icing device currently exports compensating reactive power with it
Power it is relevant, therefore the voltage that sends of conventional generator can occur dynamic change and can not meet grid-connected requirement.Therefore this implementation
Generating set in example is made up of a dc generator, energy-storage units and inversion unit.Wherein expand unit and DC generation
The rotating shaft of machine is connected, band dynamotor rotation, and mechanical energy is converted into direct current energy.Net-connected controller is current by detection
The reactive power of DC de-icing device output, the exciting current of dc generator is adjusted, it is ensured that generator output voltage
Amplitude is not sent reactive power change by device to be influenceed.Dc generator output end is connected with energy-storage units, and generator is produced
Raw electric energy is first stored.Inversion unit is connected with energy-storage units, by DC inverter into satisfactory three-phase alternating current,
Realize grid-connected.
3rd, afterheat generating system and water cooling designed by intensive DC de-icing device of the present invention with cogeneration function
Radiating and water cooling system compatibility can be widely used in all kinds of transformer stations.
The control method tool of intensive DC de-icing device of the present invention with cogeneration function has the advantage that：This hair
The control method of the bright intensive DC de-icing device with cogeneration function detects intensive direct current by net-connected controller
The reactive power of the output of deicing device, net-connected controller is according to dc generator in the Reactive Power Control generating set of output
Exciting current so that what the output voltage amplitude of dc generator kept constant and not exported by intensive DC de-icing device
The influence of reactive power change, while the switch off time and frequency of wholly-controled device send out direct current in net-connected controller inversion unit
The voltage conversion of motor output is the three-phase alternating current with AC network same frequency same-phase, can overcome intensive DC ice melting
The reactive-load compensation of device and active power filtering branch road output reactive power can be adjusted realization according to reactive power distribution situation in station
Waste heat produced by dynamic compensation, device is relevant with the power that it currently exports compensating reactive power, and then causes generator to send
Voltage can occur dynamic change and can not meet the technical problem of grid-connected requirement so that the intensive style with cogeneration function is straight
Stream deicing device is not influenceed by the reactive power change that intensive DC de-icing device is exported, reliable with output voltage stabilization
Advantage.
Brief description of the drawings
Fig. 1 is systematic difference structural representation of the embodiment of the present invention.
Marginal data：1st, medium heat-exchange device；2nd, unit is expanded；3rd, condensate recycling device；4th, generating set；5th, it is grid-connected
Controller；6th, intensive DC de-icing device body；61st, constant impedance low-loss connection transformer；62nd, capacitor and reactor
Group；63rd, operational mode conversion equipment；64th, low harmony wave DC ice melting voltage conversion unit；65th, DC ice-melting switching device；66、
Static reactive and active power filtering part；67th, high-power heat-dissipation system.
Embodiment
As shown in figure 1, the intensive DC de-icing device that the present embodiment has cogeneration function is included with high-power
The intensive DC de-icing device body 6 of cooling system 67, goes back medium heat-exchange device 1, expansion unit 2, condensate recycling device
3rd, generating set 4 and net-connected controller 5, medium heat-exchange device 1 include separate two-way hot switching path, and heat is handed over all the way
Change passage be connected with the thermal fluid loop interface of high-power heat-dissipation system 67, another road hot switching path successively with expansion unit 2,
The formation hot working fluid closed circulation of condensate recycling device 3, the control end of generating set 4 is connected with net-connected controller 5, generator
The output end of group 4 is connected with AC network, and generating set 4 includes dc generator and inversion unit, expands the output shaft of unit 2
It is connected with dc generator, the output end of dc generator passes sequentially through inversion unit and is connected with AC network.Intensive direct current
Reactive-load compensation and active power filtering branch road realize that closed cycle dissipates by the high-power heat-dissipation system 67 of particular design in deicing device
Heat, high-power heat-dissipation system 67 is connected with the medium heat-exchange device 1 of the present embodiment, and waste heat is transferred into thermal medium makes its vapour
Change, medium heat-exchange device 1 is connected with expansion unit 2, expansion unit 2 converts heat into mechanical energy, and expansion unit 2 is with generating electricity
Unit 4, which is connected, drives generator operation, produces electric energy and is connected to the grid, and expansion unit 2 is handed over by condensate recycling device 3 and medium heat
Changing device 1 is connected, and sending condensed thermal medium back to heat-exchange device constitutes closed cycle, and net-connected controller 5 then passes through control
Inversion unit inversion in generating set 4 goes out the three-phase alternating current with line voltage same frequency same-phase.The present embodiment has remaining
The intensive DC de-icing device of hot generating function can be to reactive-load compensation in intensive DC de-icing device and active power filtering branch
Waste heat recovery produced by road, and the waste heat of recovery is converted into electric energy be connected to the grid, energy utilization rate is improved, reduces and melts
Ice production apparatus thermal pollution, to realizing that energy-saving and emission-reduction, development Environmental Protection Strategy are significant.
As shown in figure 1, generating set 4 also includes energy-storage units in the present embodiment, the output end of dc generator is led to successively
Cross energy-storage units, inversion unit with AC network to be connected, the electric energy that generator is produced first is stored, inversion unit and energy storage
Unit is connected, by DC inverter into satisfactory three-phase alternating current, realizes grid-connected, generating set 4 is produced and meets
The three-phase alternating current of grid-connected requirement.
Contain hot working fluid inside medium heat-exchange device, for realizing heat transfer, the dress that water cooling system is taken out of
Put waste heat and be transferred to hot working fluid, vaporize hot working fluid, deicing device waste heat is converted into the heat energy and kinetic energy of hot working fluid.This reality
Apply in example, hot working fluid is R601a organic working mediums, can additionally be had using R601 organic working mediums, R134a organic working mediums, R290
Machine working medium, the single substance in R1270 organic working mediums or foregoing two or more mixture, the thermal source that different working medium are adapted to
Temperature is different, can choose suitable working medium according to thermal source actual temperature.
As shown in figure 1, the constant impedance low-loss connection that intensive DC de-icing device 6 includes access 35kV ac bus becomes
Operational mode conversion equipment is also associated with depressor 61 and capacitor and reactor group 62, constant impedance low-loss connection transformer 61
63, operational mode conversion equipment 63 is then connected to ice-melt branch road and reactive-load compensation and active power filtering branch road, is respectively used to reality
Existing ice-melt mode and reactive-load compensation pattern.Ice-melt branch road includes low harmony wave DC ice melting voltage conversion unit 64 and DC ice-melting is cut
Changing device 65, DC ice-melting switching device 65 is used to treat that ice-melt hvdc transmission line is connected with direct current 25kV/5000A；It is idle
Compensation and active power filtering branch road then include two static reactives and active power filtering part 66 that are arranged in parallel, and two static
High-power heat-dissipation system 67, the collection with cogeneration function of the invention are connected with reactive-load compensation and active power filtering part 66
About type DC de-icing device is exactly recycled to be used to generate electricity with the waste heat of high-power heat-dissipation system 67.
In summary, for intensive DC de-icing device, the intensive direct current with cogeneration function of the invention
Deicing device is returned huge thermal losses of the intensive deicing device under dynamic passive compensation pattern produced by longtime running
Receive, be eventually converted into electric energy and feed back to AC network, therefore dramatically reduce the energy consumption of device, alleviate plant running
The thermal pollution that surrounding enviroment are produced, while the intensive DC de-icing device with cogeneration function of the present invention can be extensive
Suitable for various types of intensive DC de-icing devices, with important social and economic significance.
In the present embodiment, the reactive-load compensation of intensive DC de-icing device and active power filtering branch road can be according to idle points in station
Cloth situation output reactive power is adjusted realization dynamic compensation, and the waste heat produced by device currently exports compensation with it
Idle power is relevant, therefore the voltage that sends of conventional generator can occur dynamic change and can not meet grid-connected requirement.To understand
Certainly above-mentioned technical problem, the implementation that the present embodiment has the control method of the intensive DC de-icing device of cogeneration function is walked
Suddenly include：
1）The mode of operation of the intensive DC de-icing device body 6 of detection, if intensive DC de-icing device body 6 is operated in
Reactive-load compensation pattern, then redirect execution step 2）；Otherwise, execution step 1 is redirected）Continue to detect；
2）Net-connected controller 5 detects the reactive power of the output of intensive DC de-icing device；
3）Net-connected controller 5 is according to the exciting current of dc generator in the Reactive Power Control generating set 4 of output so that straight
The output voltage amplitude for flowing generator keeps constant with the shadow for the reactive power change not exported by intensive DC de-icing device
Ring, while the switch off time and frequency of the wholly-controled device in the control inversion unit of net-connected controller 5 export dc generator
Voltage conversion be three-phase alternating current with AC network same frequency same-phase so that the intensive style with cogeneration function is straight
Stream deicing device is not influenceed by the reactive power change that intensive DC de-icing device is exported, reliable with output voltage stabilization
Advantage.
In the present embodiment, inversion unit is three-phase inversion structure, and the control algolithm of the control inversion unit of net-connected controller 5 is adopted
SPWM modulation algorithms are used, net-connected controller 5 controls inverter output AC electricity and power network same frequency, same-phase by SPWM algorithms
Realize grid-connected.
In the present embodiment, step 3）The switch off time of wholly-controled device and during frequency in the middle inversion unit of net-connected controller 5
Also include locking strategy, detailed step includes：The high-power heat-dissipation system work shape of the intensive DC de-icing device of detection in real time
State, if abnormal, locking inversion unit, so as to disconnect generating set 4 and AC network occurs in intensive DC de-icing device
Connection, by detecting the working condition of deicing device cooling system, the locking inverter when radiating occurs abnormal disconnects grid-connected
Connection, prevent power grid energy pour in down a chimney prevent failure in the case of generating set 4 be damaged, and then influence deicing device normally dissipate
Heat.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of intensive DC de-icing device with cogeneration function, including with high-power heat-dissipation system（67）Collection
About type DC de-icing device body（6）, it is characterised in that：Also include medium heat-exchange device（1）, expansion unit（2）, condense back
Receiving apparatus（3）, generating set（4）And net-connected controller（5）, the medium heat-exchange device（1）Including separate two-way
Hot switching path, all the way hot switching path and high-power heat-dissipation system（67）Thermal fluid loop interface be connected, another road heat is handed over
Change passage successively with expansion unit（2）, condensate recycling device（3）Form hot working fluid closed circulation, the generating set（4）
Control end and net-connected controller（5）It is connected, the generating set（4）Output end be connected with AC network, the generator
Group（4）Including dc generator and inversion unit, the expansion unit（2）Output shaft be connected with dc generator, it is described straight
The output end of stream generator passes sequentially through inversion unit and is connected with AC network.
2. the intensive DC de-icing device according to claim 1 with cogeneration function, it is characterised in that：It is described
Generating set（4）Also include energy-storage units, the output end of the dc generator passes sequentially through energy-storage units, inversion unit and friendship
Power network is flowed to be connected.
3. the intensive DC de-icing device according to claim 1 with cogeneration function, it is characterised in that：It is described
Hot working fluid is in R601a organic working mediums, R601 organic working mediums, R134a organic working mediums, R290 organic working mediums, R1270 organic working medium
Single substance or two or more mixtures.
4. the intensive DC de-icing device with cogeneration function according to claim 1 or 2 or 3, its feature exists
In：The intensive DC de-icing device body（6）Constant impedance low-loss including accessing 35kV ac bus connects transformer
（61）With capacitor and reactor group（62）, the constant impedance low-loss connection transformer（61）On be also associated with operational mode turn
Changing device（63）, the operational mode conversion equipment（63）Then it is connected to ice-melt branch road and reactive-load compensation and active power filtering branch
Road, the ice-melt branch road includes low harmony wave DC ice melting voltage conversion unit（64）With DC ice-melting switching device（65）, it is described
Reactive-load compensation and active power filtering branch road then include two static reactives and active power filtering part being arranged in parallel（66）, and two
Platform static reactive and active power filtering part（66）On be connected with high-power heat-dissipation system（67）.
5. the controlling party of the intensive DC de-icing device with cogeneration function described in a kind of claim 1 or 2 or 3 or 4
Method, it is characterised in that implementation steps include：
1）The intensive DC de-icing device body of detection（6）Mode of operation, if intensive DC de-icing device body（6）Work
Make in reactive-load compensation pattern, then redirect execution step 2）；Otherwise, execution step 1 is redirected）Continue to detect；
2）Net-connected controller（5）The reactive power of the output of the intensive DC de-icing device of detection；
3）Net-connected controller（5）According to the Reactive Power Control generating set of output（4）The exciting current of middle dc generator, makes
The output voltage amplitude for obtaining dc generator keeps the constant reactive power not exported by intensive DC de-icing device to change
Influence, while net-connected controller（5）The switch off time and frequency of wholly-controled device in inversion unit are controlled by DC generation
The voltage conversion of machine output is the three-phase alternating current with AC network same frequency same-phase.
6. the control method of the intensive DC de-icing device according to claim 5 with cogeneration function, it is special
Levy and be, step 3）Middle net-connected controller（5）The switch off time of wholly-controled device and also include locking during frequency in inversion unit
Strategy, detailed step includes：The high-power heat-dissipation working state of system of the intensive DC de-icing device of detection in real time, if intensive
There is exception in type DC de-icing device, then locking inversion unit, so as to disconnect generating set（4）With the connection of AC network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710701899.3A CN107248720B (en) | 2017-08-16 | 2017-08-16 | Intensive direct-current ice melting device with waste heat power generation function and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710701899.3A CN107248720B (en) | 2017-08-16 | 2017-08-16 | Intensive direct-current ice melting device with waste heat power generation function and control method thereof |
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| CN107248720B CN107248720B (en) | 2023-06-27 |
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|---|---|---|---|---|
| CN111769478A (en) * | 2020-07-13 | 2020-10-13 | 贵州电网有限责任公司 | Direct-current ice melting control method for power transmission line |
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| CN107248720B (en) | 2023-06-27 |
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