CN207765967U - Container type energy storage direct current side parallel machine control system - Google Patents
Container type energy storage direct current side parallel machine control system Download PDFInfo
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- CN207765967U CN207765967U CN201820258077.2U CN201820258077U CN207765967U CN 207765967 U CN207765967 U CN 207765967U CN 201820258077 U CN201820258077 U CN 201820258077U CN 207765967 U CN207765967 U CN 207765967U
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- energy storage
- direct current
- current side
- control system
- power conversion
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- 238000004146 energy storage Methods 0.000 title claims abstract description 110
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 238000007599 discharging Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 7
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical group [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses container formula energy storage direct current side parallel operation control system, this system include a plurality of container formula energy storage terminals who inserts the electric wire netting, every energy storage terminal includes respectively: the alternating current side of the power conversion system is connected into a power grid, and the direct current side of the power conversion system is connected with the energy storage unit; and the energy storage unit at least comprises a storage battery, wherein the direct current sides of the adjacent power conversion systems are connected through a contactor, and the control system further comprises a controller which is respectively connected with all the contactors and can selectively control the on-off of the contactors. The utility model discloses control system when the problem at the energy storage terminal can not in time make full use of appears based on one or several energy storage terminals, carries out charge and discharge through the PCS at other energy storage terminals, can accurate, stable control energy storage terminal go up the electric initial automatic balance of looking for, balanced supply load, every energy storage terminal of make full use of, balanced charge and discharge reduces the loss in factory, improves economic benefits.
Description
Technical Field
The application relates to the technical field of intelligent power grids, in particular to a container type energy storage direct current side parallel machine control system.
Background
At present, most of container energy storage systems are respectively merged into a power grid, alternating current-direct current electric energy conversion and electric energy flow direction control are realized through a bidirectional converter, and the container energy storage systems are merged into a 10kV power grid through a step-up transformer (400V/10kV) of a distribution room at a user side. However, the containers between each factory floor are not only provided with one container energy storage system, but also are independent of each other, the loads of the containers are unbalanced, and the capacities of the batteries are also unbalanced. This presents a problem: if PCS in one or more container energy storage systems has problems or the battery systems have unbalanced electric quantity and unbalanced loads, and other reasons, the container energy storage systems cannot be fully utilized. Therefore, the overall coordination and the flexible diversity of the whole factory container energy storage system cannot be exerted.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a container formula energy storage direct current side parallel operation control system realizes making container energy storage system more nimble, more convenient to the balanced charge-discharge in many container energy storage terminals.
In order to achieve the above object, the utility model provides a following technical scheme:
the embodiment of the application discloses container formula energy storage direct current side parallel operation control system, including a plurality of container formula energy storage terminals who inserts the electric wire netting, every energy storage terminal includes respectively:
the alternating current side of the power conversion system is connected into a power grid, and the direct current side of the power conversion system is connected with the energy storage unit;
the energy storage unit at least comprises a storage battery,
wherein,
the direct current sides of the adjacent power conversion systems are connected through a contactor,
furthermore, it is possible to provide a liquid crystal display device,
the control system also comprises a controller which is respectively connected with all the contactors and can selectively control the on-off of the contactors.
Preferably, in the container type energy storage direct current side parallel control system, the controller selectively controls the on-off of the contactor so as to balance the electric quantity of each energy storage unit.
Preferably, in the container type energy storage dc-side parallel control system, when one or more first energy storage units cannot be charged or discharged normally, the power conversion systems of the other one or more energy storage terminals are connected to the first energy storage units and control the charging or discharging thereof.
Preferably, in the container type energy storage dc-side parallel operation control system, the failure of the first energy storage unit to be normally charged or discharged at least includes one of the following cases:
a. the power conversion system corresponding to the first energy storage unit fails and cannot normally charge and discharge the energy storage unit;
b. the electric quantity among different energy storage units is unbalanced;
c. the power supply of each load is not balanced.
Preferably, in the container type energy storage direct current side parallel control system, a switch is arranged between the power conversion system and the corresponding energy storage unit in the same energy storage terminal.
Preferably, in the container type energy storage direct current side parallel control system, the controller is in communication connection with each power conversion system.
Preferably, in the container type energy storage direct current side parallel control system, the alternating current side of the power conversion system is directly connected to the power grid or is connected to the power grid through an isolation transformer.
Preferably, in the container type energy storage dc-side parallel operation control system, the ac sides of the plurality of power conversion units are connected in common and then supply power to the same load.
Preferably, in the container type energy storage dc-side parallel control system, the energy storage unit further includes a battery management system for monitoring the state of the storage battery, and the controller is in communication connection with each battery management system.
Compared with the prior art, the utility model has the advantages of: the utility model discloses control system appears PCS when problem appearance, battery system electric quantity is uneven and other reasons such as load unbalance based on one or several container energy storage terminal and can not in time make full use of energy storage terminal, and PCS through other energy storage terminals carries out the charge-discharge, and the electricity is initial to look for the balance automatically on can accurate, stable control energy storage terminal, balanced supply load, every energy storage terminal of make full use of, balanced charge-discharge reduces the loss in factory, improves economic benefits.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a container type energy storage dc side parallel operation control system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a container type energy storage dc side parallel operation control method according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the embodiment provides a container type energy storage dc-side parallel operation control system, which includes a plurality of container type energy storage terminals 50 connected to a power grid 10, each of the energy storage terminals includes a Power Conversion System (PCS)51 and an energy storage unit 52, an ac side of the PCS is connected to the power grid 10, and a dc side of the PCS is connected to the energy storage unit. The energy storage unit at least comprises a storage battery.
Specifically, the dc sides of adjacent power conversion systems are connected by a contactor 60.
Further, the control system further includes a controller 70, which is respectively connected to all the contactors and can selectively control the on/off of the contactors.
Further, the controller selectively controls the on-off of the contactor so as to balance the electric quantity of each energy storage unit.
Specifically, when one or more first energy storage units cannot be charged and discharged normally, the power conversion systems of other one or more energy storage terminals are connected to the first energy storage units and control the charging and discharging of the first energy storage units.
The first energy storage unit can not be charged and discharged normally and at least comprises one of the following conditions:
a. the power conversion system corresponding to the first energy storage unit fails and cannot normally charge and discharge the energy storage unit;
b. the electric quantity among different energy storage units is unbalanced;
c. the power supply of each load is not balanced.
In the technical scheme, a PCS is arranged and is used for energy conversion, energy can be charged into a storage battery from a power grid through an isolation transformer, the charging is called, and the energy can also be fed back into the power grid from the storage battery through the isolation transformer, the discharging is called.
In one embodiment, a switch 53 is disposed between the power conversion system and the corresponding energy storage unit in the same energy storage terminal.
In one embodiment, the controller is communicatively coupled to each of the power conversion systems.
In one embodiment, the ac side of the power conversion system is connected directly to the grid or through an isolation transformer 30.
In the technical scheme, the power grid can be a national power grid of 10kv, and can also be an ad hoc power grid generated by solar cells, wind energy and the like.
In one embodiment, the ac sides of the power converters are connected together to supply power to the same load 40.
In one embodiment, the ac sides of each two power conversion sections are connected in common and then supply power to the load 40.
In one embodiment, the energy storage unit further comprises a Battery Management System (BMS) for monitoring the state of the battery, and the controller is communicatively connected to each battery management system.
The Battery Management System (BMS) is a unit for managing the storage battery, is an electronic equipment set used for monitoring, evaluating and protecting the running state of the storage battery, can effectively monitor various states (voltage, current, temperature, SOC, SOH and the like) of the storage battery, can carry out safety management on the charging and discharging processes of the storage battery, can carry out alarm and emergency protection treatment on possible faults of the storage battery, can carry out optimization control on the running of the storage battery, and ensures the safe, reliable and stable running of the storage battery. The BMS system is an indispensable important component in the energy storage system, guarantees effective and reliable operation of the energy storage system, and should have a monitoring function, an operation alarm function, a protection function, a self-diagnosis function, a balance management function, a parameter management function, a local operation state display function, and the like.
Generally, the information and processing capacity of the storage battery such as data acquisition, data processing, state analysis, fault alarm and the like are large and need to be completed by the BMS; the functions of monitoring, controlling, protecting, alarming and the like of the battery pack and the battery stack can be completed by the PCS.
In one embodiment, the battery comprises a lithium battery.
Preferably, the lithium battery is a lithium iron phosphate battery.
The storage battery is formed by connecting a plurality of battery modules in series, each battery module is formed by connecting a plurality of battery monomers in parallel, the battery monomers adopt lithium iron phosphate batteries, and lithium iron phosphate is a preferred material used as a high-capacity power energy storage battery and meets the requirements in the aspects of comprehensive performance, safety, cost, environmental protection, technical maturity and the like, so in a preferred embodiment, the lithium iron phosphate batteries (LiFePO) are selected4LFP for short) as energy storage carrier.
In an application embodiment, the energy storage terminals are located in the same factory (an industrial factory, which may be a company, an industrial park, or a specific area defined).
Referring to fig. 2, this embodiment further provides a container type energy storage direct current side parallel operation control method, including:
s1, when the power is initially powered on, the controller selectively controls the on-off of one or more contactors to achieve the electric quantity balance of each energy storage unit (the direct electric quantities of the energy storage units of each energy storage terminal are consistent);
and s2, keeping all contactors closed after the electric quantity of each energy storage unit is balanced, and charging and discharging each energy storage unit in a balanced manner.
In a specific example, as shown in fig. 1, there are 6 dc-side parallel machines for controlling the energy storage terminals:
(1) and when the energy storage terminal is initially electrified, the energy storage unit balance of the parallel energy storage terminal is achieved by controlling the on-off of the alternating current contactor at the position 5 of the parallel machine at the direct current side and controlling the charging and discharging of each PCS.
(2) And after each energy storage unit reaches the balance, the contactor is always closed, so that the battery is charged and discharged in a balanced manner.
(3) And if the alternating current contactor at one position is disconnected, the auxiliary contact of the contactor is fed back to the controller to detect the disconnection of the contactor, and the contactor is disconnected and closed again by leveling.
To sum up, the utility model discloses an advantage includes at least:
1. maintenance of being convenient for, maintenance: if one PCS fails, the other PCS can also charge and discharge its battery system.
2. Saving cost and improving economic benefit: the container energy storage terminal is originally used for peak clipping and valley filling, so that the economic benefit is improved, but if one battery system and a plurality of battery systems are unbalanced in charging and discharging, the load is unbalanced, the load is large, the energy storage system is insufficient, the load is small, the energy storage system is incomplete, the charging and discharging can be balanced through the direct current side parallel operation, and the economic benefit is improved.
3. The operation stability of the whole system and the balance of the battery system are improved.
4. The direct current side parallel machine control of the system is controlled by the alternating current contactor, so that the research and development cost is saved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. The utility model provides a container formula energy storage direct current side parallel operation control system which characterized in that, includes a plurality of container formula energy storage terminals who inserts the electric wire netting, every energy storage terminal includes respectively:
the alternating current side of the power conversion system is connected into a power grid, and the direct current side of the power conversion system is connected with the energy storage unit;
the energy storage unit at least comprises a storage battery,
wherein,
the direct current sides of the adjacent power conversion systems are connected through a contactor,
furthermore, it is possible to provide a liquid crystal display device,
the control system also comprises a controller which is respectively connected with all the contactors and can selectively control the on-off of the contactors.
2. The container type energy storage direct current side parallel operation control system according to claim 1, wherein a controller selectively controls on and off of the contactors so as to achieve electric quantity balance of the energy storage units.
3. The container type energy storage direct current side parallel operation control system according to claim 2, wherein when one or more first energy storage units cannot be charged and discharged normally, the power conversion systems of other one or more energy storage terminals are connected to the first energy storage units and control charging and discharging of the first energy storage units.
4. The container type energy storage direct current side parallel operation control system according to claim 1, wherein a switch is arranged between the power conversion system and the corresponding energy storage unit in the same energy storage terminal.
5. The container type energy storage direct current side parallel operation control system according to claim 1, wherein the controller is in communication connection with each power conversion system.
6. The container type energy storage direct current side parallel operation control system according to claim 1, wherein the alternating current side of the power conversion system is directly connected to a power grid or is connected to the power grid through an isolation transformer.
7. The container type energy storage direct current side parallel operation control system according to claim 1, wherein the alternating current sides of the plurality of power conversion parts are connected in common to supply power to the same load.
8. The container type energy storage direct current side parallel operation control system according to claim 1, wherein the energy storage unit further comprises a battery management system for monitoring the state of the storage battery, and the controller is in communication connection with each battery management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820258077.2U CN207765967U (en) | 2018-02-13 | 2018-02-13 | Container type energy storage direct current side parallel machine control system |
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| CN201820258077.2U CN207765967U (en) | 2018-02-13 | 2018-02-13 | Container type energy storage direct current side parallel machine control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599209A (en) * | 2018-02-13 | 2018-09-28 | 江苏博强新能源科技股份有限公司 | Container type energy storage direct current side parallel operation control system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599209A (en) * | 2018-02-13 | 2018-09-28 | 江苏博强新能源科技股份有限公司 | Container type energy storage direct current side parallel operation control system and method |
| CN108599209B (en) * | 2018-02-13 | 2024-01-09 | 江苏博强新能源科技股份有限公司 | Container type energy storage direct current side parallel operation control system and method |
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