CN107086611A - The control method of transformer station's alternating current-direct current mixing microgrid station power use system - Google Patents
The control method of transformer station's alternating current-direct current mixing microgrid station power use system Download PDFInfo
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- CN107086611A CN107086611A CN201710436556.9A CN201710436556A CN107086611A CN 107086611 A CN107086611 A CN 107086611A CN 201710436556 A CN201710436556 A CN 201710436556A CN 107086611 A CN107086611 A CN 107086611A
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- photovoltaic
- direct current
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- 238000004146 energy storage Methods 0.000 claims abstract description 28
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- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 11
- 238000011217 control strategy Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
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Classifications
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
Abstract
The present invention provides a kind of control method of transformer station's alternating current-direct current mixing microgrid station power use system, including：Under normal circumstances, alternating current-direct current mixing microgrid station power use system is incorporated into the power networks, and the voltage of AC network, frequency are supported by power network；Photovoltaic cell is controlled using MPPT maximum power point tracking；When storage battery charge state is less than given threshold, energy storage two way convertor is exerted oneself carry out charge control according to the photovoltaic of photovoltaic cell；Alternating current-direct current two way convertor works in rectification mode by control targe of DC bus-bar voltage；Under accident conditions, control platform cuts off alternating current-direct current two way convertor；Photovoltaic cell is still using MPPT maximum power point tracking control；Energy storage two way convertor is exerted oneself according to photovoltaic, switches to electric discharge or charge mode to maintain DC bus-bar voltage to stabilize to target.The present invention combines the service requirement of transformer station, disclosure satisfy that power demands of each type load under normal and accident conditions.
Description
Technical field
The present invention relates to technical field of electric power automation, especially a kind of transformer station's alternating current-direct current mixing microgrid station power use system
Control method.
Background technology
With the popularization of Intelligent transformer station, standing, interior DC load is increasing, it is necessary to which the accumulator capacity of configuration is also got over
Come bigger.Station power use system DC network form of power is single, and reliability is inadequate.Station power use system rectification adverser and battery
Deng configuring complete, top idle space is stood enough, fully meet introducing photo-voltaic power supply, build the requirement of alternating current-direct current mixing microgrid.
There is transformer station's alternating current-direct current mixing microgrid station power use system alternating current-direct current mixing microgrid to reduce Technics of Power Electronic Conversion link,
Control simple advantage., it is necessary to which different control strategies is different to meet under two kinds of running statuses of grid-connected and isolated island of microgrid
Control targe.Alternating current-direct current mixing microgrid is applied to after Substation Station electricity system, is needed specific aim to develop control strategy, is met power transformation
The service requirement stood.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided a kind of transformer station's alternating current-direct current mixing microgrid
The control method of station power use system, operation shape of the control alternating current-direct current mixing microgrid station power use system under grid-connected and island state
State, to meet service requirement of the transformer station under normal and accident conditions.The technical solution adopted by the present invention is：
A kind of control method of transformer station's alternating current-direct current mixing microgrid station power use system, including：
Under normal circumstances, alternating current-direct current mixing microgrid station power use system is incorporated into the power networks, and the voltage of AC network, frequency are by power network branch
Support；Photovoltaic cell is controlled using MPPT maximum power point tracking；When storage battery charge state is less than given threshold, energy storage Bidirectional variable-flow
Device is exerted oneself carry out charge control according to the photovoltaic of photovoltaic cell；Alternating current-direct current two way convertor is using DC bus-bar voltage as control targe
Work in rectification mode；
When storage battery charge state is more than given threshold, energy storage two way convertor is standby to protect battery；Alternating current-direct current is two-way
Current transformer is exerted oneself according to photovoltaic, when photovoltaic is exerted oneself less than DC network load, is worked by control targe of DC bus-bar voltage
In rectification mode, inverter mode is worked in when photovoltaic is exerted oneself more than DC network load, the unnecessary electric energy of DC network is inverse
Change to AC network；
Under accident conditions, control platform cuts off alternating current-direct current two way convertor；Photovoltaic cell still using maximum power point with
Track is controlled；Energy storage two way convertor is exerted oneself according to photovoltaic, switch to maintain DC bus-bar voltage stabilize to target electric discharge or
Charge mode.
Further, under normal circumstances, it is described when storage battery charge state is less than given threshold, energy storage Bidirectional variable-flow
Device is exerted oneself carry out charge control according to the photovoltaic of photovoltaic cell, is specifically：
The charge power of energy storage two way convertor exerts oneself change according to the photovoltaic of photovoltaic cell and respective change is gone out with stabilizing photovoltaic
Fluctuation.
Further, under accident conditions, the energy storage two way convertor is exerted oneself according to photovoltaic, switches to maintain direct current
Busbar voltage stabilizes to electric discharge or the charge mode of target, is specifically：
When photovoltaic is exerted oneself less than DC network load, then energy storage two way convertor works in discharge mode, exerts oneself and is more than when photovoltaic
DC network load, energy storage two way convertor is standby or battery is charged..
Further, the given threshold of storage battery charge state is 95%.
The advantage of the invention is that：The control strategy of transformer station's alternating current-direct current mixing microgrid station power use system is effectively utilized friendship
The advantage of direct current mixing microgrid, reduces energy conversion link, reduces power conversion losses, and control targe need not consider idle and frequency
Rate, only need to pay close attention to voltage stabilization, simplify control process.Service requirement of the transformer station under normal and accident conditions is considered, it is full
The power demands of sufficient different load, improve the reliability of station power use system, adapt to what intelligent substation DC load constantly increased
Need, be conducive to the stable operation of system, reduce popularization and application difficulty, ensure the safe and stable operation of transformer station.
Brief description of the drawings
Fig. 1 is transformer station's alternating current-direct current mixing microgrid station power use system electrical schematic diagram of the invention.
Fig. 2 is control method flow chart of the invention.
Embodiment
With reference to specific drawings and examples, the invention will be further described.
Transformer station's alternating current-direct current mixing microgrid station power use system, as shown in figure 1, including DC network, AC network, photovoltaic electric
Pond, battery, photovoltaic converter, energy storage two way convertor, communication current transformer, ups power, alternating current-direct current two way convertor, letter
Cease acquisition module and control platform；Control platform can be the server or computer on backstage；Dc bus is provided with DC network
Ac bus L2 is provided with L1, AC network；
There is DC load, communication load, AC load, UPS loads in the station power use system；UPS loads be mainly some
Need to switch at once the machine utilization of power supply during abnormal electrical power supply, UPS loads are connected on ups power；
AC network is powered by station local coordinate frame, meets AC load and UPS load needs for electricity under normal circumstances；Direct current net
Network is powered jointly by AC power rectification and photovoltaic cell under normal circumstances, meets DC load, communication load need for electricity,
Under accident conditions, powered jointly by photovoltaic cell and battery, meet UPS loads, communication load that ups power connect and straight
The need for electricity of stream load.
Ac bus L2 is from station local coordinate frame power taking；In Fig. 1, the output difference of 1# station local coordinate frames and 2# station local coordinate frames
Connect automatic switchover device ATS two inputs, automatic switchover device ATS output termination ac bus L2；Two can automatically switch
Station local coordinate frame more preferable Alternating Current Power Supply security can be provided；
The ac input end of ups power meets ac bus L2 by breaker JK1, and direct-flow input end is connect directly by breaker JK2
Bus L1 is flowed, the feeder ear of ups power is used to connect UPS loads（UPS loads are not marked because space is limited in Fig. 1）；
Ac bus L2 connects breaker JK3 one end, and the breaker JK3 other end is used to connect AC load；Only drawn in Fig. 1
The breaker JK3 of one AC load, the breaker of the one or more AC loads of physical presence；
One end connection dc bus L1 of alternating current-direct current two way convertor, other end connection ac bus L2；
Photovoltaic cell passes through breaker by the inputs of breaker DK1 connection photovoltaic converters, the output end of photovoltaic converter
DK4 connection dc bus L1；Photovoltaic converter is converted to the output voltage of photovoltaic cell the DC voltage on dc bus L1
220v DC, and with certain voltage stabilizing ability；Photovoltaic cell can utilize Substation Station top idle space, and sun can be blocked in summer
Light, reduction Zhan Nei high and low voltage chamber temperature；
Battery is by one end of breaker DK2 connection energy storage two way convertors, and the other end of energy storage two way convertor, which passes through, to break
Road device DK5 connection dc bus L1；
Dc bus L1 connection breakers DK3 one end, the breaker DK3 other end is used to connect DC load；Only drawn in Fig. 1
The breaker DK3 of one DC load, the breaker of the one or more DC loads of physical presence；
The input of dc bus L1 connection communication current transformers, the output end of communication current transformer is used for connection communication load；
Communication can be converted to 220v DC 48v D/C voltages with current transformer；
Information acquisition module connection photovoltaic cell, battery and dc bus L1, responsible collection photovoltaic cell is exerted oneself, dc bus
Voltage and battery relevant parameter, and the parameter of collection is sent to control platform；
Control platform connects and controls photovoltaic converter, energy storage two way convertor, communication current transformer and alternating current-direct current Bidirectional variable-flow
Device；
Alternating current-direct current mixing microgrid station power use system is by control platform Comprehensive Control；Control strategy is as follows：
Under normal circumstances, alternating current-direct current mixing microgrid station power use system is incorporated into the power networks, and the voltage of AC network, frequency are by bulk power grid
Support；Photovoltaic cell is controlled using MPPT maximum power point tracking（MTTP）, maximally utilize clean energy resource；Work as storage battery charge state
（SOC）During less than 95%, energy storage two way convertor is exerted oneself carry out charge control, smooth direct current network according to the photovoltaic of photovoltaic cell
Power curve, such as the photovoltaic corresponding charge power of more big then energy storage two way convertor of exerting oneself are bigger, can stabilize photovoltaic and exert oneself
Fluctuation；Alternating current-direct current two way convertor works in rectification mode by control targe of DC bus-bar voltage；Work as storage battery charge state
（SOC）During more than 95%, energy storage two way convertor is standby to protect battery；Alternating current-direct current two way convertor is exerted oneself according to photovoltaic, when
When photovoltaic is exerted oneself less than DC network load, rectification mode is worked in by control targe of DC bus-bar voltage（I.e. by AC network
The alternating current of network carries out rectification and is supplied to DC network）, inverter mode is worked in when photovoltaic is exerted oneself more than DC network load,
By the unnecessary electric energy inversion of DC network to AC network, powered to AC network load.
Under accident conditions, transformer station need to ensure UPS loads, DC load and communication in the 1h~2h forced outage time
The power supply of load；Microgrid control platform cuts off alternating current-direct current two way convertor；Photovoltaic cell, which remains unchanged, uses MPPT maximum power point tracking
Control, maximally utilizes clean energy resource；Energy storage two way convertor is exerted oneself according to photovoltaic, switches to maintain DC bus-bar voltage steady
It is set to electric discharge or the charge mode of target, that is to say, that when photovoltaic is exerted oneself less than DC network load, then energy storage two way convertor
Discharge mode is worked in, when photovoltaic is exerted oneself more than DC network load, energy storage two way convertor is standby or battery is charged（No
Latter is crossed almost to occur without because configuration photovoltaic cell photovoltaic exert oneself it is more difficult exceed all DC networks bear
Lotus.）Under accident conditions, the load of DC network is DC load, communication load, UPS loads.
Claims (4)
1. a kind of control method of transformer station's alternating current-direct current mixing microgrid station power use system, it is characterised in that including：
Under normal circumstances, alternating current-direct current mixing microgrid station power use system is incorporated into the power networks, and the voltage of AC network, frequency are by power network branch
Support；Photovoltaic cell is controlled using MPPT maximum power point tracking；When storage battery charge state is less than given threshold, energy storage Bidirectional variable-flow
Device is exerted oneself carry out charge control according to the photovoltaic of photovoltaic cell；Alternating current-direct current two way convertor is using DC bus-bar voltage as control targe
Work in rectification mode；
When storage battery charge state is more than given threshold, energy storage two way convertor is standby to protect battery；Alternating current-direct current is two-way
Current transformer is exerted oneself according to photovoltaic, when photovoltaic is exerted oneself less than DC network load, is worked by control targe of DC bus-bar voltage
In rectification mode, inverter mode is worked in when photovoltaic is exerted oneself more than DC network load, the unnecessary electric energy of DC network is inverse
Change to AC network；
Under accident conditions, control platform cuts off alternating current-direct current two way convertor；Photovoltaic cell still using maximum power point with
Track is controlled；Energy storage two way convertor is exerted oneself according to photovoltaic, switch to maintain DC bus-bar voltage stabilize to target electric discharge or
Charge mode.
2. the control method of transformer station's alternating current-direct current mixing microgrid station power use system as claimed in claim 1, it is characterised in that
Under normal circumstances, described when storage battery charge state is less than given threshold, energy storage two way convertor is according to photovoltaic electric
The photovoltaic in pond is exerted oneself carry out charge control, is specifically：
The charge power of energy storage two way convertor exerts oneself change according to the photovoltaic of photovoltaic cell and respective change is gone out with stabilizing photovoltaic
Fluctuation.
3. the control method of transformer station's alternating current-direct current mixing microgrid station power use system as claimed in claim 1, it is characterised in that
Under accident conditions, the energy storage two way convertor is exerted oneself according to photovoltaic, switches to maintain DC bus-bar voltage stable
Electric discharge or charge mode for target, be specifically：
When photovoltaic is exerted oneself less than DC network load, then energy storage two way convertor works in discharge mode, exerts oneself and is more than when photovoltaic
DC network load, energy storage two way convertor is standby or battery is charged.
4. the control method of transformer station's alternating current-direct current mixing microgrid station power use system as claimed in claim 1, it is characterised in that
The given threshold of storage battery charge state is 95%.
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| CN201710436556.9A CN107086611A (en) | 2017-06-12 | 2017-06-12 | The control method of transformer station's alternating current-direct current mixing microgrid station power use system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103938A (en) * | 2018-10-16 | 2018-12-28 | 上海电力设计院有限公司 | Light stores up the control method for filling integrated power station |
| CN109830982A (en) * | 2019-03-06 | 2019-05-31 | 国网江苏省电力有限公司镇江供电分公司 | Substation photovoltaic power-supply system |
| CN110912169A (en) * | 2019-12-03 | 2020-03-24 | 国网天津市电力公司 | Design method and topological structure of alternating current-direct current micro-grid |
| CN111864780A (en) * | 2020-08-19 | 2020-10-30 | 南京莱迪新能源科技有限公司 | Hybrid mobile energy storage power station |
| CN112449736A (en) * | 2019-07-03 | 2021-03-05 | 东芝三菱电机产业系统株式会社 | Electric power system |
| CN112467858A (en) * | 2020-12-08 | 2021-03-09 | 南方电网调峰调频发电有限公司 | Integrated charging and discharging system |
| CN112736986A (en) * | 2020-12-24 | 2021-04-30 | 国网经济技术研究院有限公司 | Multi-station integration facility comprehensive energy efficiency system based on substation expansion |
| CN113036804A (en) * | 2021-03-22 | 2021-06-25 | 西安领充创享新能源科技有限公司 | AC/DC micro-grid control method and device |
| CN113794216A (en) * | 2021-09-06 | 2021-12-14 | 福建时代星云科技有限公司 | Parameter configuration method and terminal of optical storage and charging system |
| CN116154775A (en) * | 2023-04-20 | 2023-05-23 | 中建科技集团有限公司 | AC/DC hybrid micro-grid system based on photovoltaic power supply and control method thereof |
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| CN104052082A (en) * | 2014-06-25 | 2014-09-17 | 国家电网公司 | Off-grid and grid-connected operation light and storage joint power supply system |
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| CN104052082A (en) * | 2014-06-25 | 2014-09-17 | 国家电网公司 | Off-grid and grid-connected operation light and storage joint power supply system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103938A (en) * | 2018-10-16 | 2018-12-28 | 上海电力设计院有限公司 | Light stores up the control method for filling integrated power station |
| CN109830982A (en) * | 2019-03-06 | 2019-05-31 | 国网江苏省电力有限公司镇江供电分公司 | Substation photovoltaic power-supply system |
| CN112449736A (en) * | 2019-07-03 | 2021-03-05 | 东芝三菱电机产业系统株式会社 | Electric power system |
| CN112449736B (en) * | 2019-07-03 | 2024-02-20 | 东芝三菱电机产业系统株式会社 | Electric power system |
| CN110912169A (en) * | 2019-12-03 | 2020-03-24 | 国网天津市电力公司 | Design method and topological structure of alternating current-direct current micro-grid |
| CN111864780A (en) * | 2020-08-19 | 2020-10-30 | 南京莱迪新能源科技有限公司 | Hybrid mobile energy storage power station |
| CN111864780B (en) * | 2020-08-19 | 2022-02-25 | 南京莱迪新能源科技有限公司 | Hybrid mobile energy storage power station |
| CN112467858B (en) * | 2020-12-08 | 2022-08-16 | 南方电网调峰调频发电有限公司 | Integrated charging and discharging system |
| CN112467858A (en) * | 2020-12-08 | 2021-03-09 | 南方电网调峰调频发电有限公司 | Integrated charging and discharging system |
| CN112736986A (en) * | 2020-12-24 | 2021-04-30 | 国网经济技术研究院有限公司 | Multi-station integration facility comprehensive energy efficiency system based on substation expansion |
| WO2022199173A1 (en) * | 2021-03-22 | 2022-09-29 | 西安领充创享新能源科技有限公司 | Alternating current/direct current microgrid control method and device |
| CN113036804B (en) * | 2021-03-22 | 2024-01-26 | 西安领充创享新能源科技有限公司 | AC/DC micro-grid control method and device |
| CN113036804A (en) * | 2021-03-22 | 2021-06-25 | 西安领充创享新能源科技有限公司 | AC/DC micro-grid control method and device |
| CN113794216B (en) * | 2021-09-06 | 2022-07-05 | 福建时代星云科技有限公司 | Parameter configuration method and terminal of optical storage and charging system |
| CN113794216A (en) * | 2021-09-06 | 2021-12-14 | 福建时代星云科技有限公司 | Parameter configuration method and terminal of optical storage and charging system |
| CN116154775A (en) * | 2023-04-20 | 2023-05-23 | 中建科技集团有限公司 | AC/DC hybrid micro-grid system based on photovoltaic power supply and control method thereof |
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Application publication date: 20170822 |