CN108054775A - A kind of microgrid control method - Google Patents

A kind of microgrid control method Download PDF

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Publication number
CN108054775A
CN108054775A CN201711348211.4A CN201711348211A CN108054775A CN 108054775 A CN108054775 A CN 108054775A CN 201711348211 A CN201711348211 A CN 201711348211A CN 108054775 A CN108054775 A CN 108054775A
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CN
China
Prior art keywords
power
load
generation
control
wind
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711348211.4A
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Chinese (zh)
Inventor
裴春传
梁勋
顾永盛
于才锦
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Jiangsu Xin Yunchang Electric Technology Co Ltd
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Jiangsu Xin Yunchang Electric Technology Co Ltd
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Priority to CN201711348211.4A priority Critical patent/CN108054775A/en
Publication of CN108054775A publication Critical patent/CN108054775A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24Arrangements for preventing or reducing oscillations of power in networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/386Wind energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388Islanding, i.e. disconnection of local power supply from the network
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention discloses a kind of microgrid control method, this method monitors power grid in real time including (1) piconet controller;(2) when detecting electric network fault, honourable power prediction is carried out, according to real-time honourable power prediction value and battery capacity, carries out classification load control;Simultaneously wind light generation is controlled to enter off-grid operation pattern;If wind light generation is insufficient, control energy-storage battery electric discharge;(3) when detecting power system restoration, control wind light generation enters grid-connect mode operation, and charges to energy storage;Recover load supplyings at different levels simultaneously;(4) piconet controller adjusts operational mode in time by monitoring wind light generation, maintains power-balance of the power supply with load, inhibits power swing with reference to energy storage, wind light generation fluctuation is avoided to generate harmful effect to power grid.The present invention realizes and off-network pattern automatically switches, and control is coordinated in photovoltaic, wind turbine, energy storage, and power grid operation, power supply is reliable and stable, and power quality is met the requirements;Sufficient battery capacity, can deal with emergency case.

Description

A kind of microgrid control method
Technical field
The present invention relates to a kind of microgrid control method more particularly to a kind of microgrid controls applied to steel tower base station micro-capacitance sensor Method.
Background technology
Present Global energy-saving and emission-reduction, energy security huge challenge under, photovoltaic, wind-force, biomass, combustion will be greatly developed Useful supplement of the distributed power generation mode as centralization power generation including material battery etc., so can not only reduce power transmission When power loss and by the expense brought of power distribution network upgrading, and for user bring relatively low expense, it is higher can By property, preferable power quality, higher energy utilization rate and independence.
Distributed generation resource needs the management and control of rational energy, and the development in domestic and international presently relevant field is also relatively more slow Slowly, achievement and actual effect are all smaller, and tremendous development and application implementation also need to more study.There are wind in intelligent micro-grid The disturbing sources such as power power generation, solar energy power generating, diversity load at any time can in power distribution station, feeder line and substation's outlet There are various forms of power swings.
Micro-capacitance sensor based on steel tower base station communication has its particularity, it is necessary to meet the requirement of steel tower base station micro-capacitance sensor:1st, supply Electricity is reliable, stablize, power quality is met the requirements;2nd, to ensure sufficient battery capacity, deal with emergency case;3rd, multichannel is accurate Metering, meets the efficiency to become more meticulous and accounting management;4th, load rating controls;5th, the automatic switchover of grid-connect mode, off-network pattern, Photovoltaic, wind turbine, the coordination control of energy storage, can realize off-network stable operation.
The content of the invention
Goal of the invention:In view of the above problems, the present invention proposes a kind of microgrid controlling party applied to steel tower base station micro-capacitance sensor Method.
Technical solution:Purpose to realize the present invention, the technical solution adopted in the present invention are:A kind of microgrid controlling party Method, including step:
(1) piconet controller monitors power grid in real time;
(2) when detecting electric network fault, honourable power prediction is carried out, according to real-time honourable power prediction value and battery electricity Amount carries out classification load control;Simultaneously wind light generation is controlled to enter off-grid operation pattern;If wind light generation is insufficient, control storage It can battery discharge;
(3) when detecting power system restoration, control wind light generation enters grid-connect mode operation, and charges to energy storage;It is extensive simultaneously Multiple load supplyings at different levels;
(4) piconet controller monitoring wind light generation, adjusts operational mode in time, maintains the power-balance of power supply and load, Inhibit power swing with reference to energy storage.
Photovoltaic generation flow includes step:
(1) during irradiation deficiency, supplied and loaded by power grid;
(2) when irradiation meets inverter startup condition, photovoltaic generation powering load;
(3) when photovoltaic power generation quantity is more than load electricity consumption, charge to energy-storage battery;
(4) when energy-storage battery is full of, remaining photovoltaic electricity is counter in the form of remaining electricity online to give power grid.
Wind-power electricity generation flow includes step:
(1) during wind-force deficiency, supplied and loaded by power grid;
(2) when wind speed reaches threshold wind velocity, wind turbine power generation charges to energy-storage battery;
(3) when energy-storage battery is full of, surplus generation powering load;
(4) remaining capacity is counter in the form of remaining electricity online gives power grid;
(5) when controller of fan voltage is more than 60V, wind-driven generator brake stops power generation.
Microgrid spatial load forecasting process includes step:
(1) when distributed new power generation is more than all bearing powers of microgrid, piconet controller controls extra electricity to storage It can charge;
(2) distributed new power generation is more than all bearing powers of microgrid, and when energy storage is full of, piconet controller control light It lies prostrate inverter and reduces power output, power generation is maintained to be balanced with electric power;
(3) distributed new power generation is less than bearing power, and during alternating current power-off, piconet controller control load switch, Cut-out three-level loads, while piconet controller control energy-storage units are contributed, and maintain bearing power steady;
(4) distributed new power generation is less than bearing power, and energy storage uses more than 50%, and when alternating current does not recover yet, it is micro- Net controller controls cut-out secondary loads, retains important load, while notifies maintenance personnel.
Advantageous effect:The present invention realizes load rating control, and off-network pattern automatically switches, photovoltaic, wind turbine, energy storage association Regulation and control system, power grid operation, power supply is reliable and stable, and power quality is met the requirements;Sufficient battery capacity, can deal with burst Situation.
Description of the drawings
Fig. 1 is and off-network switches schematic diagram;
Fig. 2 is photovoltaic generation schematic diagram;
Fig. 3 is wind-power electricity generation schematic diagram;
Fig. 4 is microgrid spatial load forecasting process schematic.
Specific embodiment
Technical scheme is further described with reference to the accompanying drawings and examples.
The present invention is applied to the microgrid control method of steel tower base station micro-capacitance sensor, comprises the following steps:
(1) piconet controller monitors power grid in real time;
(2) as shown in Figure 1, when piconet controller detects electric network fault, piconet controller is according to real-time honourable power Predicted value and battery capacity, judgement can undertake bearing power, cut away unnecessary load, carry out classification load supplying;It controls simultaneously Photovoltaic generation, wind-power electricity generation enter off-grid operation pattern, if wind-power electricity generation, photovoltaic generation not enough load use, control energy storage Battery is contributed.
Under abnormal and fault condition, the preferential safe and reliable power supply for ensureing important load, can to reduce fault incidence Rapid sub-load of cutting away ensures microgrid energy balance.Consider regenerative resource consumption, meeting allows to pass through in power bracket Adjust energy storage charge and discharge strategy and optimization load electricity consumption strategy, regenerative resource maximum output.Primary goal is important load Safe and reliable power supply, improves the safety and reliability of electricity consumption, and all scheduling need to check security.
(3) as shown in Fig. 2, when piconet controller detects power system restoration, piconet controller control photovoltaic generation, wind-force Power generation is run into grid-connect mode, and is charged to energy storage;Recover load supplyings at different levels simultaneously.
As shown in figure 3, the flow of photovoltaic generation, specifically includes following steps:
(1) during irradiation deficiency, alternating current is for load;
(2) when irradiation meets inverter startup requirement, photovoltaic system starts to generate electricity, preferential powering load;
(3) when photovoltaic generation is more than load, charge to energy storage;
(4) it is counter in the form of remaining electricity online to give power grid when energy-storage battery is full of, and photovoltaic generation still has residue.
As shown in figure 4, the flow of wind-power electricity generation, specifically includes following steps:
(1) during wind-force deficiency, alternating current is for load;
(2) after wind speed reaches threshold wind velocity, wind-driven generator starts to generate electricity, and preferentially charges to energy-storage system;
(3) if battery is full of, surplus generation charges to load;
(4) it is counter in the form of remaining electricity online to send alternating current if still there is residue;
(5) if controller of fan voltage is more than 60V, wind-driven generator brake stops power generation.
When the grid collapses, important load power supply is preferentially ensured, micro-capacitance sensor enters the state of emergency, storages at different levels at this time Energy, distributed generation resource and load respond rapidly to emergency control policy, if necessary the autonomous operation of off-grid.In general, primary mesh Mark is the safe and reliable power supply of important load, should ensure that important load possesses the power supply point of 2 or 2 or more.
To improve the economy of the whole network operation, in network load peak phase, regenerative resource maximum output, energy storage uses Discharge mode controls load electricity consumption;In the network load ebb period, energy storage uses charge mode, the abundant accumulation of energy of system.
(4) piconet controller can maintain power supply by monitoring wind-force, photovoltaic generation output to adjust operational mode in time With the power-balance of load, inhibit power swing with reference to energy storage, wind-force, photovoltaic generation fluctuation is avoided to generate bad shadow to power grid It rings.
(5) by the control method, can realize the safe and stable operation of micro-capacitance sensor, can realize micro-capacitance sensor simultaneously, off-network The steady switching of state.
To improve power supply quality, the switching of micro-capacitance sensor operational modal is taken seamless switching, is estimated by power grid cognition technology Following operation of power networks trend, reduces switching times to the greatest extent.
As shown in figure 4, microgrid spatial load forecasting process includes step:
(1) when wind-force, the generation of electricity by new energy of photovoltaic distributed are more than all bearing powers of microgrid, piconet controller can be with Extra electricity is controlled to charge to energy storage;
(2) it is micro- when wind-force, the generation of electricity by new energy of photovoltaic distributed are more than all bearing powers of microgrid, and energy storage is full of Net controller can control photovoltaic DC-to-AC converter to reduce power output, and power generation is maintained to be balanced with electric power;
(3) when wind-force, the generation of electricity by new energy of photovoltaic distributed are less than bearing power, and alternating current powers off, piconet controller Control load switch, cut-out three-level load (i.e. the environmental loads such as air-conditioning, illumination), while piconet controller control energy storage list Member is contributed, and maintains bearing power steady;
(4) when wind-force, the generation of electricity by new energy of photovoltaic distributed are less than bearing power, energy storage uses more than 50%, and alternating current When not recovering yet, piconet controller control cut-out secondary loads only retain communication apparatus important load, while pass through fortune Dimension APP notifies maintenance personnel, carries Portable diesel generator and does the standby energy.

Claims (4)

1. a kind of microgrid control method, it is characterised in that:Including step:
(1) piconet controller monitors power grid in real time;
(2) when detecting electric network fault, honourable power prediction is carried out, according to real-time honourable power prediction value and battery capacity, into Row classification load control;Simultaneously wind light generation is controlled to enter off-grid operation pattern;If wind light generation is insufficient, energy-storage battery is controlled Electric discharge;
(3) when detecting power system restoration, control wind light generation enters grid-connect mode operation, and charges to energy storage;Recover simultaneously each Grade load supplying;
(4) piconet controller monitoring wind light generation, adjusts operational mode in time, maintains the power-balance of power supply and load, with reference to Energy storage inhibits power swing.
2. microgrid control method according to claim 1, it is characterised in that:Photovoltaic generation flow includes step:
(1) during irradiation deficiency, supplied and loaded by power grid;
(2) when irradiation meets inverter startup condition, photovoltaic generation powering load;
(3) when photovoltaic power generation quantity is more than load electricity consumption, charge to energy-storage battery;
(4) when energy-storage battery is full of, remaining photovoltaic electricity is counter in the form of remaining electricity online to give power grid.
3. microgrid control method according to claim 1, it is characterised in that:Wind-power electricity generation flow includes step:
(1) during wind-force deficiency, supplied and loaded by power grid;
(2) when wind speed reaches threshold wind velocity, wind turbine power generation charges to energy-storage battery;
(3) when energy-storage battery is full of, surplus generation powering load;
(4) remaining capacity is counter in the form of remaining electricity online gives power grid;
(5) when controller of fan voltage is more than 60V, wind-driven generator brake stops power generation.
4. microgrid control method according to claim 1, it is characterised in that:Microgrid spatial load forecasting process includes step:
(1) when distributed new power generation is more than all bearing powers of microgrid, piconet controller controls extra electricity to be filled to energy storage Electricity;
(2) distributed new power generation is more than all bearing powers of microgrid, and when energy storage is full of, piconet controller control photovoltaic is inverse Become device and reduce power output, power generation is maintained to be balanced with electric power;
(3) distributed new power generation is less than bearing power, and during alternating current power-off, piconet controller control load switch, excision Part three-level load, while piconet controller control energy-storage units are contributed, and maintain bearing power steady;
(4) distributed new power generation is less than bearing power, and energy storage uses more than 50%, and when alternating current does not recover yet, microgrid control Device processed controls cut-out secondary loads, retains important load, while notifies maintenance personnel.
CN201711348211.4A 2017-12-15 2017-12-15 A kind of microgrid control method Pending CN108054775A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102157978A (en) * 2011-04-14 2011-08-17 天津大学 Wind-solar-diesel storage isolated microgrid system and control method thereof
CN103997058A (en) * 2014-05-08 2014-08-20 东北大学 Control method of wind, photovoltaic and storage micro grid system
CN104505867A (en) * 2015-01-04 2015-04-08 南京国臣信息自动化技术有限公司 Alternating current and direct current hybrid micro-grid system and control strategy thereof
JP5877480B2 (en) * 2011-12-06 2016-03-08 清水建設株式会社 Self-sustaining operation system and method for distributed power supply
CN106549380A (en) * 2016-12-29 2017-03-29 哈尔滨工业大学 Multi-modal microgrid energy coordinating and optimizing control method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102157978A (en) * 2011-04-14 2011-08-17 天津大学 Wind-solar-diesel storage isolated microgrid system and control method thereof
JP5877480B2 (en) * 2011-12-06 2016-03-08 清水建設株式会社 Self-sustaining operation system and method for distributed power supply
CN103997058A (en) * 2014-05-08 2014-08-20 东北大学 Control method of wind, photovoltaic and storage micro grid system
CN104505867A (en) * 2015-01-04 2015-04-08 南京国臣信息自动化技术有限公司 Alternating current and direct current hybrid micro-grid system and control strategy thereof
CN106549380A (en) * 2016-12-29 2017-03-29 哈尔滨工业大学 Multi-modal microgrid energy coordinating and optimizing control method

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Inventor after: Tang Ping

Inventor after: Liang Xun

Inventor before: Pei Chunchuan

Inventor before: Liang Xun

Inventor before: Gu Yongsheng

Inventor before: Yu Caijin