CN103280840A - Distributed type photovoltaic energy storage system and working method thereof - Google Patents

Distributed type photovoltaic energy storage system and working method thereof Download PDF

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Publication number
CN103280840A
CN103280840A CN2013102389325A CN201310238932A CN103280840A CN 103280840 A CN103280840 A CN 103280840A CN 2013102389325 A CN2013102389325 A CN 2013102389325A CN 201310238932 A CN201310238932 A CN 201310238932A CN 103280840 A CN103280840 A CN 103280840A
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China
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energy
module
photovoltaic
execution
storage
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CN2013102389325A
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Chinese (zh)
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王育飞
薛花
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上海电力学院
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Priority to CN2013102389325A priority Critical patent/CN103280840A/en
Publication of CN103280840A publication Critical patent/CN103280840A/en

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    • 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

Abstract

The invention relates to a distributed type photovoltaic energy storage system and a working method of the distributed type photovoltaic energy storage system. The output end of a photovoltaic cell array is connected with a direct-current conversion module, and the output end of the direct-current conversion module is respectively connected with a grid-connected inverter module, an off-grid inverter module and an energy storage battery pack. The input end of a rectification conversion module is connected with a power grid, and the output end of the rectification conversion module is connected with the energy storage battery pack. The input end of the grid-connected inverter module is connected with the output end of the direct-current conversion module, and the output end of the grid-connected inverter module is connected with the power grid. The output end of the direct-current conversion module and the output end of the energy storage battery pack are connected with the input end of the off-grid inverter module, and the output end of the off-grid inverter module is connected with a load. An energy management system is respectively connected with each module to reasonably control, manage and distribute energy. The use ratio of solar energy is improved to the maximum degree, the distributed type photovoltaic energy storage system and the working method of the distributed type photovoltaic energy storage system are suitable for a photovoltaic grid-connected power generation system or a photovoltaic off-grid power generation system of an intermediate-low power grade, photovoltaic power generation and an energy storage technology are fully combined, intelligent control of photovoltaic power generation and energy storage is achieved, the power generating efficiency of the system is effectively improved, and losses are reduced.

Description

A kind of distributed photovoltaic energy-storage system and method for work thereof
Technical field
The present invention relates to a kind of solar photovoltaic generation system, particularly a kind of distributed photovoltaic energy-storage system and method for work thereof.
Background technology
Solar energy resources is abundant, widely distributed, is the most potential regenerative resource of 21 century.Along with problems such as global energy shortage and environmental pollution become increasingly conspicuous, solar energy power generating is because of its cleaning, safety, facility, characteristics such as efficient, the new industry that has become the countries in the world common concern and given priority to.Since the nineties in last century, solar energy power generating development fast, oneself is widely used in space flight, communication, traffic, and field such as resident living from far-off regions.
Solar photovoltaic generation system is divided into from net photovoltaic generating system and grid-connected photovoltaic power generation system.From the net photovoltaic generating system, mainly formed by solar module, controller, storage battery, if the AC load power supply also need be disposed from the net inverter.Grid-connected photovoltaic power generation system, to be the direct current that produces of solar components through combining inverter convert to meets the alternating current that civil power requires and directly inserts public electric wire net later on, mainly contain centralized large-scale grid-connected photovoltaic power station and two kinds of forms of distributed small-sized grid-connected photovoltaic power generation system, the former main feature is that institute's generating can be delivered directly to electrical network, powered to the user by the electrical network unified allocation of resources, but the investment of this power station is big, the construction period is long, floor space is big, and the development difficulty is relatively large; And the latter is main flow directions of following grid-connected photovoltaic power generation system development owing to have advantages such as investment is little, construction is fast, floor space is little, policy support great efforts.
At present, the solar photovoltaic generation system overall development is rapid, but still the unfavorable factor that exists many restriction distributed photovoltaic power generations system to apply in China, one of them namely is the cost of photovoltaic generating system.The feasible method that reduces cost: the one, improve solar energy utilization ratio, seek economical mode and utilize solar energy to greatest extent, wherein appropriate design photovoltaic energy-storage system topological structure becomes key point.The 2nd, the added value of raising solar photovoltaic generation system is utilized the energy-storage battery storage or is discharged electric energy, reduces the influence of weather, guarantees reliability and the quality of power supply of powering.
Summary of the invention
The present invention be directed to photovoltaic generating system and use the high problem of cost of promoting, a kind of distributed photovoltaic energy-storage system and method for work thereof have been proposed, in conjunction with this system also/switch flexibly from the network operation mode, the characteristics of high-quality electric energy and the high speed processing ability of EMS can be provided, can realize photovoltaic battery array maximum power tracing MPPT, the battery energy storage assembly discharges and recharges the optimum of control and two kinds of distributed power sources and coordinates control, can finish also/from the autonomous handoff functionality of net generating, at utmost improve solar energy utilization rate, prolong energy-storage battery assembly useful life, improve the electricity generation system output quality of power supply, strengthen the stability of a system, thereby improve the overall performance of photovoltaic generating system.
Technical scheme of the present invention is: a kind of distributed photovoltaic energy-storage system comprises distributed power source medium module, DC converting module, rectifying conversion module, parallel network reverse module, from net inversion module and EMS; The distributed power source medium module comprises photovoltaic battery array and energy-storage battery assembly; Photovoltaic battery array output connects the DC converting module, and DC converting module output is respectively with the parallel network reverse module, be connected with the energy-storage battery assembly from the net inversion module; The input of rectifying conversion module is connected with electrical network, and the rectifying conversion module output is connected with the energy-storage battery assembly; The parallel network reverse module input is connected with DC converting module output, and parallel network reverse module output is connected with electrical network; DC converting module and energy-storage battery assembly output termination are connected with load from net inversion module output from net inversion module input; EMS is respectively with energy-accumulating medium module, DC converting module, rectifying conversion module, parallel network reverse module be connected from the net inversion module.
Described photovoltaic cell management system, energy-storage battery management system, DC converting module, rectifying conversion module, parallel network reverse module, be connected by order wire is two-way between net inversion module and the described EMS.
Described parallel network reverse module, be connected by dc bus between net inversion module, DC converting module, rectifying conversion module and photovoltaic battery array, the energy-storage battery assembly.
Described parallel network reverse module, be connected by ac bus between net inversion module, rectifying conversion module and electrical network, the load.
Described photovoltaic battery array is by the crystal silicon solar battery component string or composes in parallel.
Described parallel network reverse module comprises combining inverter and the protective circuit that is incorporated into the power networks, and comprises from the net inverter with from the net protective circuit from the net inversion module.
A kind of distributed photovoltaic energy-storage system method of work comprises the distributed photovoltaic energy-storage system, from being provided with the photovoltaic cell management system, from being provided with the energy-storage battery management system, specifically comprises the steps: in the energy-storage battery assembly in the photovoltaic battery array
1) judge the photovoltaic battery array service conditions, the photovoltaic battery array operation is normal, determines execution in step;
2) the photovoltaic battery array operation is normal, carries out the photovoltaic battery array maximum power tracing;
3) whether judge photovoltaic energy greater than the bearing power set point, if execution in step 4 then), execution in step 7 then if not);
4) photovoltaic battery array powers to the load, and whether judges the residue photovoltaic energy greater than energy-storage battery assembly energy requirement value, if execution in step 5 then), execution in step 9 then if not);
5) if energy-storage battery assembly charging, and whether judge the residue photovoltaic energy greater than the power threshold that is incorporated into the power networks is execution in step 6 then), execution in step 14 then if not);
6) parallel network power generation, and execution in step 14);
7) whether judge photovoltaic energy greater than energy-storage battery assembly energy requirement value, if execution in step 8 then, execution in step 10 then if not) and step 11);
8) energy-storage battery assembly charging, electrical network powers to the load;
9) whether judge the residue photovoltaic energy greater than the power threshold that is incorporated into the power networks, if execution in step 6 then), execution in step 14 then if not);
10) whether judge photovoltaic energy greater than the power threshold that is incorporated into the power networks, if execution in step 6 then), execution in step 14 then if not);
11) whether judge the energy-storage battery energy greater than the bearing power set point, if execution in step 12 then), execution in step 13 then if not);
12) battery component discharge powers to the load, and execution in step 14);
13) electrical network charges to battery component, and powers to the load;
14) judge whether to shut down, if then out of service, execution in step 3 then if not).
Beneficial effect of the present invention is: distributed photovoltaic energy-storage system of the present invention and method of work thereof, can finish photovoltaic battery array maximum power tracing MPPT, battery energy storage assembly discharge and recharge control, also/from functions such as the autonomous switchings of net generating; Can monitor photovoltaic battery array ruuning situation, can rationally control its direct current size of exerting oneself, at utmost improve solar energy utilization rate; Can realize the monitoring to energy-storage battery assembly operating situation, by reasonably discharging and recharging control the energy-storage battery assembly be carried out energy management, prolong the life-span of energy-storage battery assembly; Realize the optimum coordination control of photovoltaic battery array and two kinds of distributed power sources of energy-storage battery assembly, can the raising system export the quality of power supply, strengthen the stability of a system, improve the overall performance of photovoltaic generating system; In being applicable to the photovoltaic of low power level also/from the net electricity generation system, with photovoltaic generation and the abundant combination of energy storage technology, realize the Based Intelligent Control of photovoltaic and energy storage, effectively improve system's generating efficiency, reduce the wastage.
Description of drawings
Fig. 1 is distributed photovoltaic energy-storage system general structure block diagram of the present invention;
Fig. 2 is distributed photovoltaic energy-storage system connection layout of the present invention;
Fig. 3 is that distributed power source medium of the present invention is through power converter module johning knot composition;
Fig. 4 is the method for work flow chart of distributed photovoltaic energy-storage system of the present invention.
Embodiment
As Fig. 1 general structure block diagram and Fig. 2 system connection layout, the distributed photovoltaic energy-storage system comprises distributed power source medium module, DC converting module, rectifying conversion module, parallel network reverse module, from net inversion module and EMS; The distributed power source medium module comprises photovoltaic battery array and energy-storage battery assembly; Photovoltaic battery array output connects the DC converting module, and DC converting module output is respectively with the parallel network reverse module, be connected with the energy-storage battery assembly from the net inversion module; The input of rectifying conversion module is connected with electrical network, and the rectifying conversion module output is connected with the energy-storage battery assembly; The parallel network reverse module input is connected with DC converting module output, and parallel network reverse module output is connected with electrical network; DC converting module and energy-storage battery assembly output termination are connected with load from net inversion module output from net inversion module input; EMS is respectively with energy-accumulating medium module, DC converting module, rectifying conversion module, parallel network reverse module be connected from the net inversion module.
From being provided with the photovoltaic cell management system, be provided with the energy-storage battery management system in the energy-storage battery assembly certainly in the photovoltaic battery array.
The distributed power source medium is through power converter module johning knot composition as shown in Figure 3, photovoltaic cell management system, energy-storage battery management system, DC converting module, rectifying conversion module, parallel network reverse module, is connected by the energy state order wire is two-way between net inversion module and the described EMS.
The parallel network reverse module, be connected by dc bus between net inversion module, DC converting module, rectifying conversion module and photovoltaic battery array, the energy-storage battery assembly.
The parallel network reverse module, be connected by ac bus between net inversion module, rectifying conversion module and electrical network, the load.
Photovoltaic battery array is by the crystal silicon solar battery component string or composes in parallel.The parallel network reverse module comprises combining inverter and the protective circuit that is incorporated into the power networks.Comprise from the net inverter with from the net protective circuit from the net inversion module.
This system controls exerting oneself of energy-storage battery when guaranteeing the output of photovoltaic array maximum power, finish energy-storage battery is carried out management of charging and discharging according to reasonably discharging and recharging control strategy, on the basis of satisfying the energy storage energy adjustment, guarantee the system power quality, prolong energy-storage battery useful life.
System control function is divided into: the optimum coordination of EMS control, photovoltaic battery array maximum power tracing, energy-storage battery assembly discharge and recharge control.Wherein EMS realizes that mainly communication scheduling, system mode detect, optimal power allocation control; Photovoltaic array power is followed the trail of and is realized the output of photovoltaic array maximum power; The energy-storage battery assembly discharges and recharges control according to control command, according to reasonably discharging and recharging strategy, realizes input and the output of energy-storage battery assembly energy.
The method of work flow chart of distributed photovoltaic energy-storage system as shown in Figure 4 comprises following step:
1): judge the photovoltaic battery array service conditions, is the photovoltaic battery array operation normal? determine execution in step;
2): the photovoltaic battery array operation is normal, carries out the photovoltaic battery array maximum power tracing;
3): whether judge photovoltaic energy greater than the bearing power set point, if execution in step 4 then), execution in step 7 then if not);
4): photovoltaic battery array powers to the load, and whether judges the residue photovoltaic energy greater than energy-storage battery assembly energy requirement value, if execution in step 5 then), execution in step 9 then if not);
5): energy-storage battery assembly charging, and whether judge the residue photovoltaic energy greater than the power threshold that is incorporated into the power networks, if execution in step 6 then), execution in step 14 then if not);
6): parallel network power generation, and execution in step 14);
7): whether judge photovoltaic energy greater than energy-storage battery assembly energy requirement value, if execution in step 8 then, execution in step 10 then if not) and step 11);
8): the charging of energy-storage battery assembly, electrical network powers to the load;
9): whether judge the residue photovoltaic energy greater than the power threshold that is incorporated into the power networks, if execution in step 6 then), execution in step 14 then if not);
10): whether judge photovoltaic energy greater than the power threshold that is incorporated into the power networks, if execution in step 6 then), execution in step 14 then if not);
11): whether judge the energy-storage battery energy greater than the bearing power set point, if execution in step 12 then), execution in step 13 then if not);
12): the battery component discharge, power to the load, and execution in step 14);
13): electrical network charges to battery component, and powers to the load;
14): judge whether to shut down, if then out of service, execution in step 3 then if not).
System preferentially sends photovoltaic battery array power into load bus according to the EMS dispatch command; If underpower was controlled photovoltaic battery array power and sent into the energy-storage battery assembly this moment, powered to the load by electrical network; If energy-storage battery assembly energy is full, control energy-storage battery assembly energy flows into load bus, and photovoltaic battery array power is sent into the electrical network bus.If photovoltaic battery array does not have power output, energy-storage battery does not have energy output yet, is then charged to energy-storage battery by electrical network, and powers to the load.Coordination control by photovoltaic battery array and energy-storage battery assembly, can at utmost improve solar energy utilization rate, prolong energy-storage battery assembly useful life, the raising system output quality of power supply, strengthen the stability of a system, thereby improve the overall performance of photovoltaic generating system.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, the those of ordinary skill in described field is to be understood that: still can make amendment or replacement on an equal basis to the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (7)

1. a distributed photovoltaic energy-storage system is characterized in that, comprises distributed power source medium module, DC converting module, rectifying conversion module, parallel network reverse module, from net inversion module and EMS; The distributed power source medium module comprises photovoltaic battery array and energy-storage battery assembly; Photovoltaic battery array output connects the DC converting module, and DC converting module output is respectively with the parallel network reverse module, be connected with the energy-storage battery assembly from the net inversion module; The input of rectifying conversion module is connected with electrical network, and the rectifying conversion module output is connected with the energy-storage battery assembly; The parallel network reverse module input is connected with DC converting module output, and parallel network reverse module output is connected with electrical network; DC converting module and energy-storage battery assembly output termination are connected with load from net inversion module output from net inversion module input; EMS is respectively with energy-accumulating medium module, DC converting module, rectifying conversion module, parallel network reverse module be connected from the net inversion module.
2. according to the described distributed photovoltaic energy-storage system of claim 1, it is characterized in that, described photovoltaic cell management system, energy-storage battery management system, DC converting module, rectifying conversion module, parallel network reverse module, be connected by order wire is two-way between net inversion module and the described EMS.
3. according to the described distributed photovoltaic energy-storage system of claim 1, it is characterized in that, described parallel network reverse module, be connected by dc bus between net inversion module, DC converting module, rectifying conversion module and photovoltaic battery array, the energy-storage battery assembly.
4. according to the described distributed photovoltaic energy-storage system of claim 1, it is characterized in that, described parallel network reverse module, be connected by ac bus between net inversion module, rectifying conversion module and electrical network, the load.
5. according to the described distributed photovoltaic energy-storage system of claim 1, it is characterized in that described photovoltaic battery array is by the crystal silicon solar battery component string or composes in parallel.
6. according to the described distributed photovoltaic energy-storage system of claim 1, it is characterized in that described parallel network reverse module comprises combining inverter and the protective circuit that is incorporated into the power networks, and comprises from the net inverter with from the net protective circuit from the net inversion module.
7. distributed photovoltaic energy-storage system method of work, comprise the distributed photovoltaic energy-storage system, from being provided with the photovoltaic cell management system, be provided with the energy-storage battery management system in the energy-storage battery assembly certainly in the photovoltaic battery array, it is characterized in that, specifically comprise the steps:
1) judge the photovoltaic battery array service conditions, the photovoltaic battery array operation is normal, determines execution in step;
2) the photovoltaic battery array operation is normal, carries out the photovoltaic battery array maximum power tracing;
3) whether judge photovoltaic energy greater than the bearing power set point, if execution in step 4 then), execution in step 7 then if not);
4) photovoltaic battery array powers to the load, and whether judges the residue photovoltaic energy greater than energy-storage battery assembly energy requirement value, if execution in step 5 then), execution in step 9 then if not);
5) if energy-storage battery assembly charging, and whether judge the residue photovoltaic energy greater than the power threshold that is incorporated into the power networks is execution in step 6 then), execution in step 14 then if not);
6) parallel network power generation, and execution in step 14);
7) whether judge photovoltaic energy greater than energy-storage battery assembly energy requirement value, if execution in step 8 then, execution in step 10 then if not) and step 11);
8) energy-storage battery assembly charging, electrical network powers to the load;
9) whether judge the residue photovoltaic energy greater than the power threshold that is incorporated into the power networks, if execution in step 6 then), execution in step 14 then if not);
10) whether judge photovoltaic energy greater than the power threshold that is incorporated into the power networks, if execution in step 6 then), execution in step 14 then if not);
11) whether judge the energy-storage battery energy greater than the bearing power set point, if execution in step 12 then), execution in step 13 then if not);
12) battery component discharge powers to the load, and execution in step 14);
13) electrical network charges to battery component, and powers to the load;
14) judge whether to shut down, if then out of service, execution in step 3 then if not).
CN2013102389325A 2013-06-17 2013-06-17 Distributed type photovoltaic energy storage system and working method thereof CN103280840A (en)

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Cited By (12)

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CN105207266A (en) * 2015-10-26 2015-12-30 苏州华安普电力科技股份有限公司 Distributed intelligent energy storage system for realizing photovoltaic power generation at roof
US20160070286A1 (en) * 2014-09-04 2016-03-10 Abhay Gupta Systems and Methods for Optimizing Energy Usage Using Energy Disaggregation Data and Time of Use Information
CN105515053A (en) * 2016-01-29 2016-04-20 山东鲁能智能技术有限公司 Photovoltaic generation and energy storage integrated system based on battery echelon utilization and intelligent terminal communication
FR3029326A1 (en) * 2014-12-02 2016-06-03 Imex Trade METHOD AND SYSTEM FOR ENERGY MANAGEMENT
CN105871057A (en) * 2016-06-01 2016-08-17 中国华能集团清洁能源技术研究院有限公司 Wind-generating-set emergency power system based on fuel cell and working method
CN106099901A (en) * 2013-12-18 2016-11-09 郭淑华 Communication base station solar DC electricity-generating control method
CN107147147A (en) * 2017-06-15 2017-09-08 山东新华联智能光伏有限公司 Photovoltaic generating system
CN108565889A (en) * 2018-02-09 2018-09-21 江苏师范大学 A kind of Spinning and off-grid power supply system
CN109167377A (en) * 2018-10-09 2019-01-08 上海博阳新能源科技股份有限公司 Electric charging station system is stored up using the light of battery based on echelon
CN110474363A (en) * 2019-07-26 2019-11-19 江阴市新昶虹电力科技股份有限公司 Off-network energy-accumulating power station and its working method with grid-connected function and energy direct grid-connected
CN110912197A (en) * 2019-12-12 2020-03-24 佛山市思正能源技术有限公司 Modularized household light storage system capable of automatically scheduling energy and control method
CN111211365A (en) * 2020-01-15 2020-05-29 清华大学 Multi-energy-storage battery system and control method thereof

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106099901A (en) * 2013-12-18 2016-11-09 郭淑华 Communication base station solar DC electricity-generating control method
US20160070286A1 (en) * 2014-09-04 2016-03-10 Abhay Gupta Systems and Methods for Optimizing Energy Usage Using Energy Disaggregation Data and Time of Use Information
US10431985B2 (en) 2014-12-02 2019-10-01 Imeon Energy Power management method
FR3029326A1 (en) * 2014-12-02 2016-06-03 Imex Trade METHOD AND SYSTEM FOR ENERGY MANAGEMENT
CN105207266A (en) * 2015-10-26 2015-12-30 苏州华安普电力科技股份有限公司 Distributed intelligent energy storage system for realizing photovoltaic power generation at roof
CN105515053A (en) * 2016-01-29 2016-04-20 山东鲁能智能技术有限公司 Photovoltaic generation and energy storage integrated system based on battery echelon utilization and intelligent terminal communication
CN105871057A (en) * 2016-06-01 2016-08-17 中国华能集团清洁能源技术研究院有限公司 Wind-generating-set emergency power system based on fuel cell and working method
CN107147147A (en) * 2017-06-15 2017-09-08 山东新华联智能光伏有限公司 Photovoltaic generating system
CN108565889A (en) * 2018-02-09 2018-09-21 江苏师范大学 A kind of Spinning and off-grid power supply system
CN109167377A (en) * 2018-10-09 2019-01-08 上海博阳新能源科技股份有限公司 Electric charging station system is stored up using the light of battery based on echelon
CN110474363A (en) * 2019-07-26 2019-11-19 江阴市新昶虹电力科技股份有限公司 Off-network energy-accumulating power station and its working method with grid-connected function and energy direct grid-connected
CN110912197A (en) * 2019-12-12 2020-03-24 佛山市思正能源技术有限公司 Modularized household light storage system capable of automatically scheduling energy and control method
CN110912197B (en) * 2019-12-12 2021-05-04 佛山市思正能源技术有限公司 Modularized household light storage system capable of automatically scheduling energy and control method
CN111211365A (en) * 2020-01-15 2020-05-29 清华大学 Multi-energy-storage battery system and control method thereof
CN111211365B (en) * 2020-01-15 2020-10-30 清华大学 Multi-energy-storage battery system and control method thereof

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Application publication date: 20130904