CN102487148B - Large-scale all vanadium flow energy-storage battery system and its control method and use - Google Patents
Large-scale all vanadium flow energy-storage battery system and its control method and use Download PDFInfo
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Abstract
The invention relates to the integrated field of all vanadium flow energy-storage battery systems and specially, relates to a large-scale all vanadium flow energy-storage battery system and its control method and use. The large-scale all vanadium flow energy-storage battery system comprises multiple battery unit systems having different power scales or the same power scale. The battery unit systems are connected by liquid connection pipes. Through adjustment on valves of the liquid connection pipes and inlet and outlet valves of a battery module, different-power scale and different-capacity operation modes of the large-scale all vanadium flow energy-storage battery system are realized, and the independent operation of the large-scale all vanadium flow energy-storage battery system is realized. The large-scale all vanadium flow energy-storage battery system mainly aims at energy storage scale requirement instability in solar energy and wind energy generation, can prolong service lives of the battery module and electrolyte, and can reduce power consumption.
Description
Technical field
The present invention relates to all-vanadium liquid flow energy storage battery system integration field, particularly energy storage and stable output design and the progress control method thereof of extensive all-vanadium liquid flow energy storage battery system in solar energy, wind power generation application.
Background technology
Along with rapid development of economy, contradiction between the energy, resource and environment, the renewable energy power generation technology such as popularization and application solar energy, wind energy are the important channels that solves Chinese energy safety, realizes energy-saving and emission-reduction fundamental state policy, are the great demands of national economy sustainable development.Because the renewable energy systems such as solar energy and wind energy have the unstable state characteristic of unsteadiness and discontinuity, its energy output can produce marked change, needs the supporting high-efficiency energy-storage technology of development and construction to guarantee continuity and the stationarity of generating and power supply.Compare with other energy storage technologies, all-vanadium liquid flow energy storage battery has that energy conversion efficiency is high, capacitance of storage is large, addressing is free, can deep discharge, the advantage such as safety and environmental protection, maintenance cost be low, become one of one preferred technique of extensive high-efficiency energy-storage technology.
The application form of all-vanadium liquid flow energy storage battery in solar energy, wind power generation system is mainly: when the power of solar energy, wind electricity generating system surpasses setpoint power output, and need to be by electrical power storage in all-vanadium liquid flow energy storage battery; When the power of solar energy, wind electricity generating system does not reach setpoint power output, need all-vanadium liquid flow energy storage battery electric discharge to supplement.Therefore, for energy-storage battery, its input current, power, capacity and output current, power, capacity etc. are all uncertain, how to tackle these operating conditions and change the impact bringing, being flexible problem, is the problem that must solve in actual application.Reason mainly contains the following aspects: one, battery module has certain service life cycle, for different input and output power, can suitably select the battery module of some to discharge and recharge, whole all-vanadium liquid flow energy storage battery system is participated in the useful life that operation is unfavorable for extending battery module; Its two, electrolyte has certain service life cycle equally, for less input, output capacity, all electrolyte discharges and recharges the capacity attenuation that can accelerate electrolyte; Its three, for different power scales, flow of electrolyte corresponding to all-vanadium liquid flow energy storage battery system is also different, when power scale changes, flow of electrolyte is constant, will certainly cause the power loss of pump.Therefore from the viewpoint of reducing all-vanadium liquid flow energy storage battery system power dissipation and increasing the service life, need to carry out flexible design to all-vanadium liquid flow energy storage battery system, and set up corresponding control method.
Summary of the invention
The object of the invention is the problems referred to above that exist in order to solve extensive all-vanadium liquid flow energy storage battery system in renewable energy power generation application, a kind of extensive all-vanadium liquid flow energy storage battery flexiblesystem design and corresponding control method thereof are provided, when extending all-vanadium liquid flow energy storage battery system useful life, reduce the power consumption of all-vanadium liquid flow energy storage battery system.
For achieving the above object, the technical solution used in the present invention is:
Extensive all-vanadium liquid flow energy storage battery system is comprised of the cellular system of some power, capacity scale, between cellular system, by liquid line, connect, by the terminal valve of valve and battery module on adjusting liquid connecting line, realize the operational mode of extensive all-vanadium liquid flow energy storage battery system different capacity scale, different capabilities demand.
Be specially:
Extensive all-vanadium liquid flow energy storage battery flexiblesystem, it is by positive integer m, and the all-vanadium liquid flow energy storage battery cellular system of m >=2 forms; Each cellular system is by anode electrolyte storage tank, negative pole electrolysis liquid storage tank, and circulating pump, all-vanadium liquid flow energy storage battery module, valve forms;
Anode electrolyte storage tank is connected with the anode electrolyte entrance and exit of all-vanadium liquid flow energy storage battery module respectively by two pipelines, on the anode electrolyte entrance of all-vanadium liquid flow energy storage battery module and the connecting line between anode electrolyte storage tank, be provided with circulating pump, between circulating pump and the outlet of anode electrolyte storage tank, valve be set;
Negative pole electrolysis liquid storage tank is connected with the negative pole electrolyte entrance and exit of all-vanadium liquid flow energy storage battery module respectively by two pipelines, on the negative pole electrolyte entrance of all-vanadium liquid flow energy storage battery module and the connecting line between negative pole electrolysis liquid storage tank, be provided with circulating pump, between circulating pump and the outlet of negative pole electrolysis liquid storage tank, valve be set;
Described all-vanadium liquid flow energy storage battery module is positive integer n, n >=1; When all-vanadium liquid flow energy storage battery module is n > 1, all-vanadium liquid flow energy storage battery intermodule is series, parallel or connection in series-parallel combination;
Anode electrolyte storage tank between different battery unit systems, by pipeline connection, is provided with valve on connecting pipeline; Negative pole electrolysis liquid storage tank between different battery unit systems, by pipeline connection, is provided with valve on connecting pipeline;
Anode electrolyte outlet between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection, and tie point, between the outlet valve and circulating pump of anode electrolyte storage tank, is provided with valve on connecting pipeline; Negative pole electrolyte outlet between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection, and tie point, between the outlet valve and circulating pump of negative pole electrolysis liquid storage tank, is provided with valve on connecting pipeline;
Anode electrolyte entrance between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection, and tie point, between the inlet valve and battery module outlet valve of anode electrolyte storage tank, is provided with valve on connecting pipeline; Negative pole electrolyte entrance between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection, and tie point, between the inlet valve and battery module outlet valve of negative pole electrolysis liquid storage tank, is provided with valve on connecting pipeline;
Between different all-vanadium liquid flow energy storage battery cellular systems, form 6 interconnective liquid pipeline that communicates.
When all-vanadium liquid flow energy storage battery module is n > 1, at anode electrolyte entrance and exit and the negative pole electrolyte entrance and exit place of all-vanadium liquid flow energy storage battery module, be respectively arranged with valve.
When system consists of the all-vanadium liquid flow energy storage battery cellular system of m > 2, described 6 corresponding liquid lines that interconnect form cascaded structure successively between different all-vanadium liquid flow energy storage battery cellular systems.
The progress control method of described all-vanadium liquid flow energy storage battery system, by the valve on control different units system connecting line and the terminal valve of battery module, the both positive and negative polarity electrolyte of realizing any cellular system can enter the battery module of other cellular systems, the both positive and negative polarity electrolyte flowing out from battery module in cellular system arbitrarily can enter the both positive and negative polarity electrolyte storage tank of other cellular systems, the both positive and negative polarity electrolyte of cellular system can enter the intrasystem both positive and negative polarity storage tank of adjacent cells arbitrarily, reach the operation demand of different capacity scale and different capabilities demand.
All-vanadium liquid flow energy storage battery system of the present invention can be applicable to solar energy and/or wind power generation energy storage.
tool of the present invention has the following advantages:
1. the present invention is by the Coupling Design of all-vanadium liquid flow energy storage battery cellular system, set up extensive all-vanadium liquid flow energy storage battery flexiblesystem, realize the demand of extensive all-vanadium liquid flow energy storage battery system different capacity, different capabilities, be conducive to extend the useful life of battery module and electrolyte.
2. the present invention, by switching the valve on liquid connecting line between all-vanadium liquid flow energy storage battery cellular system liquid line and cellular system thereof, realizes the operation of the all-vanadium liquid flow energy storage battery system of different capacity, different capabilities, simple to operate, is easy to realize.
3. the present invention is directed to the unsteadiness to energy storage scale demand in solar energy, wind power generation application process, adopt converter technique to regulate flow of electrolyte according to operate power scale, meeting the power consumption that reduces all-vanadium liquid flow energy storage battery system under the prerequisite of flow of electrolyte.
Accompanying drawing explanation
Fig. 1 is all-vanadium liquid flow energy storage battery cellular system schematic flow sheet;
Fig. 2 is the all-vanadium liquid flow energy storage battery flexiblesystem schematic flow sheet that the present invention includes two cellular systems;
Fig. 3 is the all-vanadium liquid flow energy storage battery flexiblesystem schematic flow sheet that the present invention includes three cellular systems.
In figure: 1 anode electrolyte storage tank, 2 negative pole electrolysis liquid storage tanks, 3 circulating pumps, 4 valves, 5 battery modules.
Embodiment
Extensive all-vanadium liquid flow energy storage battery system builds according to required maximum power, the capacity requirement of application, all-vanadium liquid flow energy storage battery cellular system by some power scales forms, and each cellular system is comprised of electrolyte storage tank, circulating pump, some battery modules, valve and electrolyte pipeline respectively.
All-vanadium liquid flow energy storage battery system consists of 2 battery unit systems as shown in Figure 2; Each cellular system is by anode electrolyte storage tank 1, negative pole electrolysis liquid storage tank 2, and circulating pump 3, valve 4, battery module 5 forms;
Anode electrolyte storage tank 1 is connected with the anode electrolyte entrance and exit of all-vanadium liquid flow energy storage battery module 5 respectively by two pipelines, on the connecting line of 1 of the anode electrolyte entrance of all-vanadium liquid flow energy storage battery module 5 and anode electrolyte storage tank, be provided with circulating pump 3, between circulating pump 3 and anode electrolyte storage tank 1, valve 4 be set;
Negative pole electrolysis liquid storage tank 2 is connected with the negative pole electrolyte entrance and exit of all-vanadium liquid flow energy storage battery module 5 respectively by two pipelines, on the connecting line of 2 of the negative pole electrolyte entrance of all-vanadium liquid flow energy storage battery module 5 and negative pole electrolysis liquid storage tanks, be provided with circulating pump 3, between circulating pump 3 and negative pole electrolysis liquid storage tank 1, valve 4 be set;
The both positive and negative polarity electrolyte tank bottom of described liquid flow energy storage battery cellular system is provided with two outlets, and one of them is connected with circulating pump, and another is connected with the outlet at bottom of the corresponding both positive and negative polarity electrolyte of other cellular systems storage tank by liquid line; Electrolyte tank top is provided with electrolyte entrance;
Anode electrolyte storage tank 1 between different battery unit systems, by pipeline connection a, is provided with valve 4 on connecting pipeline;
Negative pole electrolysis liquid storage tank 2 between different battery unit systems, by pipeline connection b, is provided with valve 4 on connecting pipeline;
Anode electrolyte outlet between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection c, and tie point, between the outlet valve and circulating pump 3 of anode electrolyte storage tank 1, is provided with valve 4 on connecting pipeline;
Negative pole electrolyte outlet between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection d, and tie point, between the outlet valve and circulating pump 3 of negative pole electrolysis liquid storage tank 2, is provided with valve 4 on connecting pipeline;
Anode electrolyte entrance between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection e, and tie point, between the inlet valve and battery module outlet valve of anode electrolyte storage tank 1, is provided with valve 4 on connecting pipeline;
Negative pole electrolyte entrance between different all-vanadium liquid flow energy storage battery cellular systems is by pipeline connection f, and tie point, between the inlet valve and battery module outlet valve of negative pole electrolysis liquid storage tank 2, is provided with valve 4 on connecting pipeline;
Between different all-vanadium liquid flow energy storage battery cellular systems, form 6 interconnective liquid pipeline that communicates
Described all-vanadium liquid flow energy storage battery cellular system is composed in series by 5 10kW battery modules, and the both positive and negative polarity electrolyte of each battery module is imported and exported and is provided with valve.
The conveying of described all-vanadium liquid flow energy storage battery cellular system electrolyte adopts circulating pump, according to different operate power scales, regulates the flow of both positive and negative polarity electrolyte.
The extensive all-vanadium liquid flow energy storage battery flexiblesystem of the present invention design is mainly for the unsteadiness to energy storage scale demand in solar energy, wind power generation application process, extend battery module and electrolyte useful life, reduce the power consumption of all-vanadium liquid flow energy storage battery system.
Concrete control method is:
1. the label on closing liquid connecting line is i ", j ", k ", l ", m ", n " valve, can realize the independent operating (50kW/100 kWh) of two cellular systems.
2. when the oepration at full load of all-vanadium liquid flow energy storage battery system, there are two kinds of operational modes:
1) the valve i on closing liquid connecting line ", j ", k " and, l ", m " and, n ", open valve a ", b ", c " and, d ", e "; f ", g ", h ", cellular system is independently on liquid line, can be by the 100kW/200 kWh system that is connected to form of circuit;
2) open valve a ", d ", e "; g ", i ", j "; k ", l ", m " n "; valve-off b ", f ", c "; h ", the anodal circulating pump 3 of two cellular systems extracts electrolyte from anodal storage tank 1, respectively after battery module 5,5 ', all get back to anodal storage tank 1 ', the electrolyte in anodal storage tank 1 ' is got back in anodal storage tank 1 gradually, in like manner can obtain the flow process of negative side.Now two cellular systems are coupled on liquid line, form 100kW/200 kWh system.
3. when all-vanadium liquid flow energy storage battery system power demand is larger, capacity hour can be by following operation: open valve e ", f ", g "; h ", j ", k ", l "; m ", valve-off a ", b "; c ", d ", i "; n ", the anodal circulating pump of two cellular systems extracts electrolyte from anodal storage tank 1 ', respectively after battery module 5,5 ', all get back to anodal storage tank 1 ', in like manner can obtain the flow process of negative side, form 100kW/100 kWh system; Now the electrolyte in electrolyte storage tank 1,2 does not participate in discharging and recharging operation, has reduced cycle-index, has extended useful life.
4. when all-vanadium liquid flow energy storage battery system power demand is less, can be by following operation when capacity is larger: open valve a ", d ", e "; g ", i ", k ", l "; n ", valve-off b ", c ", f "; h ", j ", m ", the anodal circulating pump of cellular system extracts electrolyte from anodal storage tank 1, after battery module 5, gets back to anodal storage tank 1 ', electrolyte in anodal storage tank 1 ' is got back in anodal storage tank 1 gradually, in like manner can obtain the flow process of negative side, forms 50kW/200 kWh system; Now the battery module in cellular system 5 ' is not participated in and is discharged and recharged operation, has reduced access times, has extended useful life.
5. the valve that the operate power scale of all-vanadium liquid flow energy storage battery cellular system can also be imported and exported by regulating cell module is adjusted, to adapt to the demand of different operate power scales:
1) when energy storage demand is 30 kW, the cellular system isolated operation of a 50kW just can satisfy the demands, but relative power demand is still larger, therefore, the terminal valve of closing two battery modules in this cellular system, now cellular system power just becomes 30kW;
2) when energy storage demand is 70 kW, need two 50kW cellular systems to move simultaneously, but also need to regulate a cellular system Operation at full power, the terminal valve of closing three battery modules in another cellular system, now the power of whole system just becomes 70kW;
3) after the operate power scale of all-vanadium liquid flow energy storage battery cellular system changes, adopt converter technique to regulate flow of electrolyte, meeting under the prerequisite of flow of electrolyte, reduce the power consumption of all-vanadium liquid flow energy storage battery system.
Claims (5)
1. extensive all-vanadium liquid flow energy storage battery system, it is by m, and the all-vanadium liquid flow energy storage battery cellular system of m >=2 forms;
Each cellular system is by anode electrolyte storage tank (1), negative pole electrolysis liquid storage tank (2), and circulating pump (3), valve (4), n all-vanadium liquid flow energy storage battery module (5) forms; Anode electrolyte storage tank (1) is connected with the anode electrolyte entrance and exit of all-vanadium liquid flow energy storage battery module (5) respectively by two pipelines, on the anode electrolyte entrance of all-vanadium liquid flow energy storage battery module (5) and the connecting line between anode electrolyte storage tank (1), be provided with circulating pump (3), between circulating pump (3) and anode electrolyte storage tank (1), valve (4) be set; Negative pole electrolysis liquid storage tank (2) is connected with the negative pole electrolyte entrance and exit of all-vanadium liquid flow energy storage battery module (5) respectively by two pipelines, on the negative pole electrolyte entrance of all-vanadium liquid flow energy storage battery module (5) and the connecting line between negative pole electrolysis liquid storage tank (2), be provided with circulating pump (3), between circulating pump (3) and negative pole electrolysis liquid storage tank (1), valve (4) be set;
Described n >=1; When all-vanadium liquid flow energy storage battery module (5) is n > 1, between all-vanadium liquid flow energy storage battery module (5) liquid road, connected mode is series, parallel or connection in series-parallel combination;
It is characterized in that: between different all-vanadium liquid flow energy storage battery cellular systems, be provided with 6 interconnective liquid lines as described below;
Anode electrolyte storage tank (1) between different battery unit systems, by pipeline connection, is referred to as a, is provided with valve (4) on connecting pipeline;
Negative pole electrolysis liquid storage tank (2) between different battery unit systems, by pipeline connection, is referred to as b, is provided with valve (4) on connecting pipeline;
Anode electrolyte outlet between different battery unit systems, by pipeline connection, is referred to as c, and tie point is positioned between the outlet valve and circulating pump (3) of anode electrolyte storage tank (1), is provided with valve (4) on connecting pipeline;
Negative pole electrolyte outlet between different battery unit systems, by pipeline connection, is referred to as d, and tie point is positioned between the outlet valve and circulating pump (3) of negative pole electrolysis liquid storage tank (2), is provided with valve (4) on connecting pipeline;
Anode electrolyte entrance between different battery unit systems passes through pipeline connection, be referred to as e, tie point is positioned between the inlet valve and all-vanadium liquid flow energy storage battery module anode electrolyte outlet valve of anode electrolyte storage tank (1), is provided with valve (4) on connecting pipeline;
Negative pole electrolyte entrance between different battery unit systems passes through pipeline connection, be referred to as f, tie point is positioned between the inlet valve and all-vanadium liquid flow energy storage battery module negative pole electrolyte outlet valve of negative pole electrolysis liquid storage tank (2), is provided with valve (4) on connecting pipeline.
2. according to system described in claim 1, it is characterized in that: when all-vanadium liquid flow energy storage battery module (5) is n > 1, at anode electrolyte entrance and exit and the negative pole electrolyte entrance and exit place of all-vanadium liquid flow energy storage battery module (5), be respectively arranged with valve (4).
3. according to system described in claim 1, it is characterized in that: when system consists of the all-vanadium liquid flow energy storage battery cellular system of m > 2, described 6 corresponding liquid lines that interconnect form cascaded structure successively between different all-vanadium liquid flow energy storage battery cellular systems.
4. the progress control method of all-vanadium liquid flow energy storage battery system described in a claim 1, it is characterized in that: by the valve on control different units system connecting line and the terminal valve of all-vanadium liquid flow energy storage battery module, the both positive and negative polarity electrolyte of realizing any cellular system enters the all-vanadium liquid flow energy storage battery module of other cellular systems or/and enter the both positive and negative polarity electrolyte storage tank of other cellular systems or/and the electrolyte the both positive and negative polarity storage tank of any cellular system can enter the intrasystem both positive and negative polarity storage tank of adjacent cells from the both positive and negative polarity electrolyte of battery module outflow in cellular system arbitrarily, reach the operation demand of different capacity scale and different capabilities demand.
5. an application for all-vanadium liquid flow energy storage battery system described in claim 1, is characterized in that: described extensive all-vanadium liquid flow energy storage battery system applies is in solar energy and/or wind power generation energy storage.
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| CN103606691B (en) * | 2013-11-20 | 2016-04-13 | 大连融科储能技术发展有限公司 | A kind of flow battery system and method for exhausting thereof had from getting rid of gas in centrifugal pump |
| CN104332573B (en) * | 2014-10-31 | 2016-08-24 | 深圳市讴德新能源技术有限公司 | Fuel cell unit, fuel cell and housing |
| CN108110295B (en) * | 2017-12-08 | 2020-09-18 | 上海电气集团股份有限公司 | Energy efficiency optimization control method and system for flow battery device |
| CN111354966B (en) * | 2018-12-20 | 2021-08-31 | 大连融慧能源科技有限公司 | Energy storage unit of all-vanadium redox flow battery system and method for improving direct-current side voltage of energy storage unit |
| CN112186220B (en) * | 2020-09-30 | 2022-02-18 | 湖南钒谷新能源技术有限公司 | Energy storage system of flow battery |
| CN114335615B (en) * | 2021-12-30 | 2023-01-13 | 寰泰储能科技股份有限公司 | System and method for balancing SOC among liquid flow units in liquid flow energy storage system |
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| US7820321B2 (en) * | 2008-07-07 | 2010-10-26 | Enervault Corporation | Redox flow battery system for distributed energy storage |
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| JP3574514B2 (en) * | 1995-09-19 | 2004-10-06 | 住友電気工業株式会社 | Redox flow type secondary battery system |
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