CN106253325A - Improve the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop - Google Patents
Improve the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop Download PDFInfo
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- CN106253325A CN106253325A CN201610603569.6A CN201610603569A CN106253325A CN 106253325 A CN106253325 A CN 106253325A CN 201610603569 A CN201610603569 A CN 201610603569A CN 106253325 A CN106253325 A CN 106253325A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses and a kind of improve the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop, it is by setting up energy-storage system on the electrical network of isolated power grid；Described energy-storage system includes grid-connected switch, energy storage supply transformer, two-way inverter and energy storage device；Described energy storage device accesses the high voltage bus of power plant for self-supply successively through two-way inverter, energy storage supply transformer and grid-connected switch；The high voltage bus of described power plant for self-supply has been used for collecting and distributing electric energy.The invention has the beneficial effects as follows the absorption process utilizing energy-storage system to electric energy, alleviate the problem that after electrical network powerful device quits work, mains frequency raises, voltage raises, avoid simultaneously and cause energy waste due to grid power surplus；Utilize the energy-storage system release process to electric energy, alleviate electrical network due to after powerful device startup work mains frequency reduce, the excessive problem of voltage drop, avoid simultaneously and cause mains breakdown owing to grid power is not enough.
Description
Technical field
The present invention relates to a kind of improve the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop, especially relate to
And isolated power grid electrical network electric energy before and after the powerful device start and stop of a kind of industrial and mining establishment with thermal power generation unit as power plant for self-supply
The method of quality.
Background technology
For a long time, owing to custom mode of thinking does not has the safeguard technology of isolated power grid with suffering from, providing for oneself of the whole nation
Power plant mostly must grid-connected could run.Under the situation generated electricity by way of merging two or more grid systems, also because costly, business burden is heavier.For entirely
For state or even energy production world cause, indivedual electricity power enterprise is had to carry out isolated power grid, but the most unstable, and the quality of power supply is poor.
Trace it to its cause, mainly the power plant of isolated power grid, big load impact cannot be solved and Smaller load frequent fluctuation causes electromotor
Cycle fluctuates the impact that brings, unit often by punching across, or cannot run the most at all.And power plant for self-supply is used for highly energy-consuming enterprise
Industry, isolated power grid is just more difficult to.Because in high energy-consuming enterprises, powerful device is more and is mostly the most stable load, large-size machine
Start and stop, the lifting of arc furnace electrode, mechanical electric fault, all can directly affect the stable operation of power plant for self-supply's generating set.
Summary of the invention
Before and after the technical problem to be solved there is provided the improvement powerful device start and stop of a kind of stability and high efficiency
The method of the isolated power grid electrical network quality of power supply.
The present invention adopts the following technical scheme that
A kind of improve the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop, be on the electrical network of isolated power grid
It is additionally arranged energy-storage system；Described energy-storage system includes grid-connected switch, energy storage supply transformer, two-way inverter and energy storage device；
Described energy storage device accesses the high voltage bus of power plant for self-supply successively through two-way inverter, energy storage supply transformer and grid-connected switch；
The high voltage bus of described power plant for self-supply has been used for collecting and distributing electric energy；
Described grid-connected switch has been used for energy-storage system and has accessed electrical network；
Described energy storage supply transformer has been used for different electric pressure electric energy conversion；
Described two-way inverter has been used for energy storage device charge or discharge.
After setting up energy-storage system, the control method of the electrical network of isolated power grid is as follows:
First, after the generator connecting in parallel with system of isolated power grid electrical network progressively during load up, conventional load is progressively cut；
Then, owing to the steam turbine momentary overload capacity of thermal power generation unit is limited, high-power according to operation of power networks Operating condition adjustment
The start and stop of equipment, concrete point of following several situations:
Situation one, non-electric machinery powerful device start before, first step up electromotor power output, its excess electron excess fraction by
Energy-storage system absorbs, and when energy-storage system absorbed power reaches the rated power of non-electric machinery powerful device, starts non-motor
Class powerful device, stops energy-storage system simultaneously and continues to absorb grid power；
Situation two, electric machinery powerful device start before, first step up electromotor power output, its excess electron excess fraction is by storing up
Energy Systemic absorption, when energy-storage system absorbed power reaches the rated power of electric machinery powerful device, starts the big merit of electric machinery
Rate equipment, instruction energy-storage system feeds to electrical network simultaneously；
Situation three, powerful device stop before, first gradually reduce electromotor power output, its underpower part is by energy storage
System delivered power is supplied, and when energy-storage system reaches the rated power of powerful device to power network compensation power, stops big merit
Rate equipment, stops energy-storage system simultaneously and continues release grid power；
When situation four, electrical network are properly functioning, when energy-storage system receives the instruction that will start powerful device, in advance to electrical network
Release stores energy；When energy-storage system receive will stop powerful device instruction time, absorb power grid energy in advance.
The beneficial effects of the present invention is: the present invention builds the solution party of a kind of isolated power grid electrical network power quality problem
Method, utilizes the energy-storage system absorption process to electric energy, alleviates mains frequency rising, electricity after electrical network powerful device quits work
The problem that pressure raises, avoids simultaneously and causes energy waste due to grid power surplus；Utilize energy-storage system that electric energy is released
Let slip journey, alleviate electrical network due to after powerful device startup work mains frequency reduce, the excessive problem of voltage drop, keep away simultaneously
Exempt to cause mains breakdown owing to grid power is not enough.
Accompanying drawing explanation
Fig. 1 be the present invention be embodied as theory diagram.
Wherein, 1 energy-storage system, the grid-connected switch of 1-1,1-2 energy storage supply transformer, the two-way inverter of 1-3,1-4 energy storage dress
Put, 2 high voltage bus, 3 switches, 4 main transformers, 5 distribution transformers, 6 electromotors, 7 station-service Working transformers, 8 auxiliary bus bar A
Section, 9 auxiliary bus bar B sections, more than 10 organize load.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with Fig. 1 and specific embodiment to invention
Carry out clear, complete description.
As it is shown in figure 1, the present embodiment relates to one improves the isolated power grid electrical network quality of power supply before and after powerful device start and stop
Method, for solve big load frequent switching make electromotor cycle, electrical network net frequency fluctuation problem so that generating set is steady
Fixed operation, the performance of enterprises stably increases.
Realize particular by following means: on the electrical network of isolated power grid, be additionally arranged energy-storage system 1；Described energy-storage system
1 includes grid-connected switch 1-1, energy storage supply transformer 1-2, two-way inverter 1-3 and energy storage device 1-4；Described energy storage device 1-4
The high voltage bus 2 of power plant for self-supply is accessed successively through two-way inverter 1-3, energy storage supply transformer 1-2 and grid-connected switch 1-1；Institute
State the high voltage bus 2 of power plant for self-supply and collect and distribute electric energy for completing；
Described grid-connected switch 1-1 has been used for energy-storage system 1 and has accessed electrical network；
Described energy storage supply transformer 1-2 has been used for different electric pressure electric energy conversion；
Described two-way inverter 1-3 has been used for energy storage device 1-4 charge or discharge.
After setting up energy-storage system 1, the control method of the electrical network of isolated power grid is as follows:
First, after the electromotor 6 of isolated power grid electrical network is grid-connected progressively during load up, conventional load is progressively cut；
Then, owing to the steam turbine momentary overload capacity of thermal power generation unit is limited, high-power according to operation of power networks Operating condition adjustment
The start and stop of equipment, concrete point of following several situations:
Situation one, non-electric machinery powerful device start before, first step up electromotor 6 power output, its excess electron excess fraction
Absorbed by energy-storage system 1, when energy-storage system 1 absorbed power reaches the rated power of non-electric machinery powerful device, start non-
Electric machinery powerful device, stops energy-storage system 1 simultaneously and continues to absorb grid power, thus start powerful device smoothly,
Thus start powerful device smoothly；
Situation two, electric machinery powerful device start before, first step up electromotor 6 power output, its excess electron excess fraction by
Energy-storage system 1 absorbs, and when energy-storage system 1 absorbed power reaches the rated power of electric machinery powerful device, starts electric machinery
Powerful device, instruction energy-storage system 1 feeds to electrical network simultaneously, thus starts powerful device smoothly；
Situation three, powerful device stop before, first gradually reduce electromotor 6 power output, its underpower part is by storing up
Can supply by system 1 delivered power, when energy-storage system 1 reaches the rated power of powerful device to power network compensation power, stop
Powerful device, stops energy-storage system 1 simultaneously and continues release grid power, thus stop powerful device smoothly；
When situation four, electrical network are properly functioning, when energy-storage system 1 receives the instruction that will start powerful device, in advance to electricity
Net release stores energy；When energy-storage system 1 receive will stop powerful device instruction time, absorb power grid energy in advance.
Principle and the embodiment of the present invention are set forth by specific case utilized above, and the explanation of above example is only
It is the method and core concept thereof being adapted to assist in and understanding the present invention；For those skilled in the art, according to the thought of the present invention,
All will change in detailed description of the invention and range of application, in sum, this specification content should not be construed as this
Bright restriction.
Claims (2)
1. one kind is improved the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop, it is characterised in that: at lonely net
Energy-storage system (1) is set up on the electrical network run；Described energy-storage system (1) includes grid-connected switch (1-1), energy storage supply transformer
(1-2), two-way inverter (1-3) and energy storage device (1-4)；Described energy storage device (1-4) successively through two-way inverter (1-3),
Energy storage supply transformer (1-2) and grid-connected switch (1-1) access the high voltage bus (2) of power plant for self-supply；The height of described power plant for self-supply
Pressure bus (2) has been used for collecting and distributing electric energy；
Described grid-connected switch (1-1) has been used for energy-storage system (1) and has accessed electrical network；
Described energy storage supply transformer (1-2) has been used for different electric pressure electric energy conversion；
Described two-way inverter (1-3) has been used for energy storage device (1-4) charge or discharge.
The most according to claim 1 improve the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop, its
It is characterised by: after setting up energy-storage system (1), the control method of the electrical network of isolated power grid is as follows:
First, after the electromotor (6) of isolated power grid electrical network is grid-connected progressively during load up, conventional load is progressively cut；
Then, owing to the steam turbine momentary overload capacity of thermal power generation unit is limited, high-power according to operation of power networks Operating condition adjustment
The start and stop of equipment, concrete point of following several situations:
Situation one, non-electric machinery powerful device start before, first step up electromotor (6) power output, its surplus portion
Divide and absorbed by energy-storage system (1), when energy-storage system (1) absorbed power reaches the rated power of non-electric machinery powerful device,
Start non-electric machinery powerful device, stop energy-storage system (1) simultaneously and continue to absorb grid power；
Situation two, electric machinery powerful device start before, first step up electromotor (6) power output, its excess electron excess fraction
Absorbed by energy-storage system (1), when energy-storage system (1) absorbed power reaches the rated power of electric machinery powerful device, start
Electric machinery powerful device, instructs energy-storage system (1) simultaneously and feeds to electrical network；
Situation three, powerful device stop before, first gradually reduce electromotor (6) power output, its underpower part by
Energy-storage system (1) delivered power is supplied, when energy-storage system (1) reaches the rated power of powerful device to power network compensation power
Time, stop powerful device, stop energy-storage system (1) simultaneously and continue release grid power；
When situation four, electrical network are properly functioning, when energy-storage system (1) receives the instruction that will start powerful device, in advance to
Electrical network release stores energy；When energy-storage system (1) receive will stop powerful device instruction time, absorb power grid energy in advance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610603569.6A CN106253325B (en) | 2016-07-28 | 2016-07-28 | The method of isolated power grid power grid power quality before and after improvement powerful device start and stop |
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| CN201610603569.6A CN106253325B (en) | 2016-07-28 | 2016-07-28 | The method of isolated power grid power grid power quality before and after improvement powerful device start and stop |
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| CN106253325A true CN106253325A (en) | 2016-12-21 |
| CN106253325B CN106253325B (en) | 2018-07-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281721A (en) * | 2018-11-26 | 2019-01-29 | 中国华能集团清洁能源技术研究院有限公司 | A kind of distributed power supply system suitable for garden power supply |
| CN109286192A (en) * | 2018-11-26 | 2019-01-29 | 中国华能集团清洁能源技术研究院有限公司 | A kind of synthesis energy supplying system suitable for garden |
| CN110492532A (en) * | 2019-08-14 | 2019-11-22 | 华润电力唐山丰润有限公司 | Frequency modulation method, device and the equipment of power supply system |
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| CN102368620A (en) * | 2011-10-28 | 2012-03-07 | 浙江大学 | Wind-energy/ solar-energy/ storage/ ocean-current-energy new-energy isolated network stabilization operation integration control system and method thereof |
| CN204030616U (en) * | 2014-07-03 | 2014-12-17 | 石家庄新华能源环保科技股份有限公司 | The energy-storage system of the lonely network operation of a kind of calcium carbide factory |
| CN104242340A (en) * | 2014-09-10 | 2014-12-24 | 南京磐能电力科技股份有限公司 | Stable control method in switching process from micro-grid non-planned grid connection operation mode to isolated island operation mode |
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2016
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102368620A (en) * | 2011-10-28 | 2012-03-07 | 浙江大学 | Wind-energy/ solar-energy/ storage/ ocean-current-energy new-energy isolated network stabilization operation integration control system and method thereof |
| CN204030616U (en) * | 2014-07-03 | 2014-12-17 | 石家庄新华能源环保科技股份有限公司 | The energy-storage system of the lonely network operation of a kind of calcium carbide factory |
| CN104242340A (en) * | 2014-09-10 | 2014-12-24 | 南京磐能电力科技股份有限公司 | Stable control method in switching process from micro-grid non-planned grid connection operation mode to isolated island operation mode |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281721A (en) * | 2018-11-26 | 2019-01-29 | 中国华能集团清洁能源技术研究院有限公司 | A kind of distributed power supply system suitable for garden power supply |
| CN109286192A (en) * | 2018-11-26 | 2019-01-29 | 中国华能集团清洁能源技术研究院有限公司 | A kind of synthesis energy supplying system suitable for garden |
| CN110492532A (en) * | 2019-08-14 | 2019-11-22 | 华润电力唐山丰润有限公司 | Frequency modulation method, device and the equipment of power supply system |
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| CN106253325B (en) | 2018-07-20 |
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