CN108599209B - Containerized energy storage DC side parallel control system and method - Google Patents
Containerized energy storage DC side parallel control system and method Download PDFInfo
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- CN108599209B CN108599209B CN201810148736.1A CN201810148736A CN108599209B CN 108599209 B CN108599209 B CN 108599209B CN 201810148736 A CN201810148736 A CN 201810148736A CN 108599209 B CN108599209 B CN 108599209B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
本申请公开了一种集装箱式储能直流侧并机控制系统和方法，该系统包括多个接入电网的集装箱式储能终端，每个所述储能终端分别包括：功率转换系统，其交流侧接入电网，其直流侧与储能单元连接；储能单元，至少包括蓄电池，其中，相邻所述功率转换系统的直流侧之间通过一接触器连接，而且，所述控制系统还包括一控制器，该控制器分别连接于所有所述接触器，并可选择性控制所述接触器通断。本发明控制系统基于一个或者几个储能终端出现不能及时充分利用储能终端的问题时，通过其他储能终端的PCS进行充放电，可以准确、稳定的控制储能终端上电初始自动找平衡，均衡的供应负载，充分利用每个储能终端，均衡充放电，减少厂区损失，提高经济效益。
This application discloses a container-type energy storage DC side parallel control system and method. The system includes multiple container-type energy storage terminals connected to the power grid. Each of the energy storage terminals includes: a power conversion system, whose AC side is connected to the power grid, and its DC side is connected to the energy storage unit; the energy storage unit at least includes a battery, wherein the DC sides of adjacent power conversion systems are connected through a contactor, and the control system also includes A controller, which is connected to all the contactors respectively, and can selectively control the on and off of the contactors. The control system of the present invention is based on the fact that when one or several energy storage terminals cannot make full use of the energy storage terminal in time, charging and discharging are carried out through the PCS of other energy storage terminals, and the energy storage terminal can be accurately and stably controlled to find balance initially after power-on. , balanced supply load, making full use of each energy storage terminal, balancing charge and discharge, reducing factory losses and improving economic benefits.
Description
Technical Field
The application relates to the technical field of smart power grids, in particular to a container type energy storage direct current side parallel operation control system and method.
Background
At present, the container energy storage system is respectively integrated into a power grid, realizes alternating current and direct current electric energy conversion and electric energy flow direction control through a bidirectional converter, and is integrated into a 10kV power grid through a step-up transformer (400V/10 kV) of a distribution room at a user side. However, more than one container energy storage system is arranged in each factory, the containers are independent of each other, the loads among the containers are unbalanced, and the capacities of the batteries are also unbalanced. This presents a problem: if the PCS in one or more container energy storage systems is out of order or the battery system is unbalanced in quantity, other reasons such as unbalanced load cannot fully utilize the container energy storage systems. Thus, the whole coordination and flexibility diversity of the whole factory container energy storage system cannot be exerted.
Disclosure of Invention
The invention aims to provide a container type energy storage direct current side parallel operation control system and method, which realize balanced charge and discharge of a plurality of container energy storage terminals and enable the container energy storage system to be more flexible and more convenient.
In order to achieve the above purpose, the present invention provides the following technical solutions:
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 of inserting the electric wire netting, every energy storage terminal includes respectively:
the power conversion system is connected with a power grid at the alternating current side and connected with the energy storage unit at the direct current side;
the energy storage unit at least comprises a storage battery,
wherein,
the direct current sides of adjacent power conversion systems are connected through a contactor,
furthermore, the processing unit is configured to,
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 operation control system, the controller selectively controls on-off of the contactor so as to realize electric quantity balance of each energy storage unit.
Preferably, in the container type energy storage direct current side parallel operation control system, when one or more first energy storage units cannot be charged and discharged normally, the power conversion system of the other one or more energy storage terminals is connected to the first energy storage units and controls charging and discharging of the first energy storage units.
Preferably, in the container type energy storage direct current side parallel operation control system, the first energy storage unit cannot be charged and discharged normally 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 between different energy storage units is unbalanced;
c. the power supply of each load is unbalanced.
Preferably, in the container type energy storage direct current side parallel operation 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 operation control system, the controller is in communication connection with each power conversion system.
Preferably, in the container type energy storage direct current side parallel operation control system, an alternating current side of the power conversion system is directly connected to a power grid or connected to the power grid through an isolation transformer.
Preferably, in the container type energy storage direct current side parallel operation control system, the alternating current sides of the plurality of power conversion parts are commonly connected to supply power to the same load.
Preferably, in the container type energy storage direct current side parallel operation control system, 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.
Correspondingly, the application also discloses a container type energy storage direct current side parallel operation control method, which comprises the following steps:
when the power is initially on, the controller selectively controls the on-off of one or more contactors, so that the electric quantity of each energy storage unit is balanced;
after the electric quantity of each energy storage unit is balanced, all the contactors are kept closed, and each energy storage unit is charged and discharged in an balanced mode.
Compared with the prior art, the invention has the advantages that: when the control system of the invention can not fully utilize the energy storage terminals in time due to the fact that one or more container energy storage terminals have problems such as PCS, unbalanced electric quantity of a battery system, unbalanced load and the like, the PCS of the other energy storage terminals can be used for charging and discharging, the initial automatic balance of the power-on of the energy storage terminals can be accurately and stably controlled, balanced supply loads are supplied, each energy storage terminal is fully utilized, the charging and discharging are balanced, the factory loss is reduced, and the economic benefit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a container type energy storage DC side parallel operation control system in an embodiment of the invention;
fig. 2 is a schematic flow chart of a parallel operation control method of a container type energy storage direct current side in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured 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 should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the present 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, the ac side of the PCS is connected to the power grid 10, and the dc side of the PCS is connected to the energy storage unit. The energy storage unit at least comprises a storage battery.
In particular, the dc sides of adjacent power conversion systems are connected by a contactor 60.
Further, the control system further comprises 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 to realize the electric quantity balance of each energy storage unit.
Specifically, when one or more first energy storage units cannot be charged or discharged normally, the power conversion system of the other one or more energy storage terminals is connected to the first energy storage units and controls the charging or discharging of the first energy storage units.
The first energy storage unit can not be charged and discharged normally 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 between different energy storage units is unbalanced;
c. the power supply of each load is unbalanced.
In the technical scheme, a PCS is arranged, the PCS is responsible for energy conversion, energy can be charged into a storage battery from a power grid through an isolation transformer, so that the storage battery is charged, and the energy can be fed back into the power grid from the storage battery through the isolation transformer, so that the storage battery is discharged.
In an embodiment, a switch 53 is provided 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 or an ad hoc power grid generated by solar cells, wind energy and the like.
In one embodiment, the ac sides of the power conversion units are commonly connected to supply power to the same load 40.
In one embodiment, the ac sides of each two power conversion sections are commonly connected and then power 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 in communication with each battery management system.
The Battery Management System (BMS) is an electronic equipment set for monitoring, evaluating and protecting the running state of the battery, can effectively monitor various states (voltage, current, temperature, SOC, SOH and the like) of the battery, can safely manage the charging and discharging processes of the battery, can alarm and emergency protection process possible faults of the battery, and can optimally control the running of the battery, so that the safe, reliable and stable running of the battery is ensured. The BMS system is an indispensable important component in the energy storage system, is a guarantee of effective and reliable operation of the energy storage system, and is required to have a monitoring function, an operation alarm function, a protection function, a self-diagnosis function, an equilibrium management function, a parameter management function, a local operation state display function and the like.
In general, the information and the processing capacity of the storage battery such as data acquisition, data processing, state analysis, fault alarming and the like are large and are required to be completed by the BMS; the functions of monitoring, controlling protection, alarming and the like of the battery pack and the battery stack can be completed by the PCS.
In one embodiment, the storage battery comprises a lithium battery.
Preferably, the lithium battery is a lithium iron phosphate battery.
The accumulator is composed of several battery modulesEach of the battery modules is formed by connecting a plurality of battery cells in parallel, the battery cells adopt lithium iron phosphate batteries, the lithium iron phosphate is the first choice material for the high-capacity power energy storage battery, and the requirements on comprehensive performance, safety, cost, environmental protection, technical maturity and the like are met, so in the preferred embodiment, the lithium iron phosphate battery (LiFePO 4 Abbreviated as LFP) as an energy storage carrier.
In an application embodiment, the plurality of energy storage terminals are disposed in the same factory (industrial production factory, which may be a company, an industrial park, or a specific area defined by circles).
With reference to fig. 2, this embodiment further provides a container type energy storage dc side parallel operation control method, which includes:
s1, when the power is initially applied, the controller selectively controls the on-off of one or more contactors to achieve the balance of the electric quantity of each energy storage unit (the direct electric quantity of the energy storage units of each energy storage terminal is consistent);
and S2, after the electric quantity of each energy storage unit is balanced, keeping all the contactors closed, and carrying out balanced charge and discharge on each energy storage unit.
Referring to fig. 1, in a specific case, there are 6 energy storage terminals for dc side parallel operation control:
(1) And when the power is initially electrified, the balance of the energy storage units of the parallel energy storage terminals is achieved by controlling the on-off of the 5 AC contactors at the parallel operation position of the DC side and controlling the charge and discharge of each PCS.
(2) After each energy storage unit reaches balance, the contactor is always closed, so that the battery is charged and discharged uniformly.
(3) If one of the AC contactors is opened, the auxiliary contact of the contactor is fed back to the controller to detect the opening of the contactor, and the opening is balanced again to close the contactor.
In summary, the advantages of the present invention at least include:
1. the maintenance is convenient, and the maintenance is convenient: if one PCS is damaged, the other PCS can charge and discharge the battery system.
2. Cost is saved, and economic benefit is improved: the container energy storage terminal originally cuts peaks and fills valleys, and improves economic benefit, but if one or a plurality of battery systems are unbalanced in charge and discharge and unbalanced in load, the load is large, the energy storage system is insufficient, the load is small, the energy storage system is not used up, the charging and discharging can be balanced through parallel operation at the direct current side, and the economic benefit is improved.
3. The running stability of the whole system and the balance of the battery system are improved.
4. The direct-current side parallel operation control of the system adopts alternating-current contactor control, so that the research and development cost is saved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
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Effective date of registration: 20240816 Address after: Room 301, Building 11, No. 518 Shenzhuan Road, Songjiang High tech Park, Shanghai Caohejing Development Zone, Songjiang District, Shanghai, 201600 Patentee after: Shanghai Aodian New Energy Technology Co.,Ltd. Country or region after: China Address before: 215600 Jiangsu Boqiang New Energy Technology Co., Ltd. Jiangsu Yangzi River International Metallurgical Industrial Park (building 25, Yuqiao Village), Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: JIANGSU BOQIANG NEW ENERGY TECHNOLOGY CO.,LTD. Country or region before: China |