CN117081127A - Energy storage container and control method thereof - Google Patents
Energy storage container and control method thereof Download PDFInfo
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- CN117081127A CN117081127A CN202311072115.7A CN202311072115A CN117081127A CN 117081127 A CN117081127 A CN 117081127A CN 202311072115 A CN202311072115 A CN 202311072115A CN 117081127 A CN117081127 A CN 117081127A
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- energy storage
- contactor
- converter
- storage container
- battery
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
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- H02J7/54—
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- H02J7/62—
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- H02J7/64—
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- H02J7/80—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an energy storage container and a control method thereof, wherein a plurality of battery clusters and energy storage converters which are connected in one-to-one correspondence are arranged in the energy storage container; the energy storage converter is provided with a direct current contactor, a DC/AC bidirectional converter and an alternating current contactor which are sequentially connected, the direct current contactor is connected to a battery cluster corresponding to the energy storage converter, and the alternating current contactor is suitable for being connected to a power grid end; the control method comprises the following steps: when the energy storage container works in a grid-connected mode, the direct current contactor, the DC/AC bidirectional converter and the alternating current contactor are sequentially closed when the energy storage converter is started; when the energy storage container works in an off-grid mode, the direct current contactor is closed, the alternating current contactor is closed, and the DC/AC bidirectional converter is started when the energy storage converter is started; the control method and the control equipment can avoid the situation that the connection between the energy storage container and the power grid end is not matched.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to an energy storage container and a control method thereof.
Background
The energy storage system generally uses battery monomers to be connected in series or in parallel to form a battery pack, the battery pack is connected in series to form a battery cluster, a plurality of battery clusters are connected in parallel to form an energy storage container, and then the energy storage container is connected with an energy storage converter, and the energy storage converter is connected with a power grid end to realize discharging and charging of the energy storage system. Wherein each battery cluster includes a high voltage tank through which it is passed as an interface component for external electrical and data communication. The high voltage tank generally includes a disconnecting switch for manually or automatically disconnecting the output of the high voltage tank when an alarm occurs, a positive main contactor, a negative main contactor, a pre-charge resistor and a pre-charge relay, which can establish a connection between the battery cluster and the energy storage converter when the positive main contactor and the negative main contactor are closed, for pre-charging the capacitive devices in the line before the high voltage tank is connected to avoid damaging the capacitive devices by transient voltages. The energy storage converter is a power conversion device in the energy storage system, and a DC/AC converter is arranged in the energy storage converter, and can convert direct current output by the energy storage container into alternating current and then output the alternating current to the power grid end, or convert the alternating current at the power grid end into direct current to charge the battery cluster.
The existing energy storage converter is only used as a power conversion device in an energy storage system, the output control of the energy storage container is processed by the high-voltage box, the energy storage container and the high-voltage box are required to be independently controlled through different control modules, mismatching is easy to occur during control, for example, when overvoltage protection or overcurrent protection is performed, the energy storage converter is not switched to a corresponding protection state, but the high-voltage box is disconnected firstly at the moment, and damage to the high-voltage box is possibly caused.
Disclosure of Invention
The invention aims to overcome the defects or problems in the background art and provide an energy storage container and a control method thereof, wherein the energy storage container can avoid the situation that the connection of the energy storage container and a power grid end is not matched.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an energy storage container is internally provided with a plurality of battery clusters and energy storage converters which are connected in a one-to-one correspondence manner; the energy storage converter is provided with a direct current contactor, a DC/AC bidirectional converter and an alternating current contactor which are sequentially connected, the direct current contactor is connected to a battery cluster corresponding to the energy storage converter, and the alternating current contactor is suitable for being connected to a power grid end.
Further, the direct current contactor comprises a direct current pre-charging contactor and a direct current main contactor which are connected in parallel; the direct current main contactor is arranged on a direct current input line of the DC/AC bidirectional converter.
Further, the direct current pre-charging contactor comprises a direct current pre-charging resistor and a direct current pre-charging relay which are connected in series.
Further, the energy storage converter further comprises an isolating switch, and the isolating switch is located between the direct current contactor and a battery cluster corresponding to the energy storage converter.
In addition, the invention also provides a control method of the energy storage container, which is based on the energy storage container according to any one of the above, and the control method comprises the following steps: when the energy storage container works in a grid-connected mode, the direct current contactor is sequentially closed, the DC/AC bidirectional converter is started, and the alternating current contactor is closed when the energy storage converter is started; when the energy storage container works in an off-grid mode, the direct current contactor is closed, the alternating current contactor is closed and the DC/AC bidirectional converter is started sequentially when the energy storage converter is started.
Further, when each energy storage converter works, battery information of a corresponding battery cluster and output power of other energy storage converters are collected, and the output power of the energy storage converters is adjusted by combining the output power required by the energy storage container.
Further, the battery information includes a temperature state, a total voltage, a total current, and/or a total state of charge of the battery cluster.
Further, when each energy storage converter works, state information of a corresponding battery cluster is collected, and when the state information shows that the battery cluster works abnormally, the DC/AC bidirectional converter is sequentially closed, the AC contactor is disconnected, and the DC contactor is disconnected.
As can be seen from the above description of the present invention, the present invention has the following advantages over the prior art:
the invention provides an energy storage container, which is internally provided with a plurality of battery clusters and energy storage converters which are connected in a one-to-one correspondence manner, wherein the energy storage converters are independently connected with a power grid end, so that the charge and discharge of each battery cluster can be realized through the energy storage converters; the energy storage container removes the original high-voltage box, utilizes the energy storage converter to control the on-off of the output of the battery clusters, also removes the large energy storage converter outside the original energy storage container, is more convenient to use compared with the conventional energy storage system, does not need to be equipped with an independent energy storage converter, reduces the manufacturing cost, can adjust the output power of each battery cluster through the energy storage converter, can improve the response rate, reduce the current loss, realize the discharge balance among the battery clusters, improve the battery utilization rate, reduce the battery barrel effect, and avoid the influence of low-energy batteries on the discharge of the high-energy batteries;
in addition, because the high-voltage box is removed, and the energy storage converters are arranged for each battery cluster, the corresponding battery cluster can be directly controlled to be connected with the power grid end through each energy storage converter, so that the control complexity is greatly reduced only by controlling the energy storage converters, and the situation that the connection of the battery clusters and the power grid end is not matched can be avoided.
Meanwhile, in the control method based on the energy storage container, the energy storage container is divided into a grid-connected mode and a grid-disconnected mode according to different working modes, and different operation modes are adopted for starting the energy storage converter in different modes, wherein when the energy storage container is started in the grid-connected mode, the energy storage converter is sequentially closed or started in the sequence of a direct current contactor, a DC/AC bidirectional converter and an AC contactor, in the process, the DC/AC bidirectional converter is started before the AC contactor, so that the voltage of the AC side of the DC/AC bidirectional converter can be slowly started, and then when the AC contactor is closed, the high voltage at the power grid end cannot impact a capacitor device in the energy storage converter, so that the safety of internal devices of the energy storage converter is ensured; when the power grid is started in the off-grid mode, the power grid is sequentially closed or started in the order of the direct current contactor, the alternating current contactor and the DC/AC bidirectional converter, and the output end of the energy storage converter is free of high voltage and cannot impact a capacitor device in the energy storage converter in the off-grid mode, so that the DC contactor and the alternating current contactor can be closed first and then the DC/AC bidirectional converter is started, the output efficiency and the response speed of the energy storage converter are improved, and the voltage buffering effect is provided for a load.
Meanwhile, the DC/AC bidirectional converter has slow voltage on the alternating current side during operation, and can charge a capacitor device on a circuit, so that the damage of the alternating current contactor caused by overlarge instantaneous current during the closing of the alternating current contactor is avoided.
When the energy storage converters work, the output power of each energy storage converter can be adjusted according to the battery information of the battery clusters, the output power of other energy storage converters and the output power required by the energy storage container, so that the discharge balance among the battery clusters can be maintained, and the influence on the normal work of other battery clusters caused by too low battery energy of one or some battery clusters is avoided. The battery information may be the total voltage, total current, and/or total state of charge of the battery cluster, which can represent the current output capacity of the battery cluster as well as the battery energy.
When the energy storage converter works, the energy storage converter can be timely closed when the battery cluster works abnormally, such as overvoltage, overcurrent and the like, the DC/AC bidirectional converter is sequentially closed, the AC contactor is disconnected, the DC contactor is disconnected in the closing process, the connection between the battery cluster and the power grid end can be rapidly disconnected in the sequence, and the energy storage converter can be buffered through the DC/AC bidirectional converter.
The direct current contactor comprises a direct current pre-charging contactor and a direct current main contactor, when the direct current contactor is closed, the direct current pre-charging contactor is firstly closed, then the direct current main contactor is closed, and the line of the energy storage converter is conducted in advance through the direct current pre-charging contactor, so that a capacitor device on the line is charged, and the direct current contactor is prevented from being damaged due to overlarge instantaneous current when the direct current contactor is closed and communicated.
The isolating switch is arranged in the energy storage converter, so that the connection between the energy storage converter and the battery cluster can be automatically or manually disconnected, and the protection of overvoltage, overcurrent, undervoltage, short circuit and other states of the battery cluster can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present invention, 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 structural diagram of an energy storage container provided by the invention;
fig. 2 is a schematic structural diagram of the energy storage converter in fig. 1.
The main reference numerals illustrate:
an energy storage container 1; a battery cluster 2; an energy storage converter 3; a direct current contactor 31; a dc main contactor 311; a dc precharge contactor 312; a dc precharge resistance 3121; dc precharge relay 3122; an isolation switch 32; a DC/AC bi-directional converter 33; an ac contactor 34; an ac main contactor 341; a battery pack 4; a control device 5; and a grid end 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are preferred embodiments of the invention and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without creative efforts, are within the protection scope of the present invention.
In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, references to orientation or positional relationship such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are based on the orientation and positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of the invention.
In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.
In the claims, specification and drawings of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.
Examples
The embodiment of the invention provides an energy storage container 1 and a control method thereof, and the structure of the energy storage container 1 is described below.
Referring to fig. 1, the energy storage container 1 is internally provided with a plurality of battery clusters 2 and an energy storage converter 3 which are connected in a one-to-one correspondence, the energy storage converter 3 is provided with a direct current contactor 31, a DC/AC bidirectional converter 33 and an alternating current contactor 34 which are sequentially connected, the direct current contactor 31 is connected to the battery cluster 2 corresponding to the energy storage converter 3, and the alternating current contactor 34 is suitable for being connected to the power grid end 6.
The power grid end 6 refers to a port connected with a power grid, which may be a transformer physically, the energy storage container 1 is connected with a first end of the transformer, and a second end of the transformer is connected with an ac bus and then connected with the power grid through the ac bus. In this embodiment, the energy storage containers 1 do not include a transformer, and a transformer may be shared by multiple groups of energy storage containers 1, or each energy storage container 1 may be used alone, and each transformer is connected to an ac bus.
The body of the energy storage container 1 is of a conventional container type structure, a containing cavity is formed in the body, and the energy storage container 1 can be designed to be of a walk-in type or a non-walk-in type according to actual needs. It should be appreciated that the present embodiment provides a more compact energy storage container 1, and therefore a smaller volume and footprint than conventional energy storage containers 1.
Each battery cluster 2 is arranged and installed in the accommodating cavity of the energy storage box body, and each battery cluster 2 comprises a plurality of battery packs 4 connected in series and/or in parallel. Specifically, referring to fig. 1, a plurality of battery clusters 2 are disposed in an energy storage box, the battery clusters 2 are not wired to each other, and each battery cluster 2 is independent; each battery cluster 2 comprises a plurality of battery packs 4, wherein the battery packs 4 are formed by combining battery core monomers, and each battery pack 4 comprises an anode output end and a cathode output end; according to practical needs, the battery packs 4 may be connected in series, that is, the positive electrodes and the negative electrodes of adjacent battery packs 4 are connected and together form a total positive electrode output end and a total negative electrode output end of the battery cluster 2. Of course, in other embodiments, the battery packs 4 may be connected in parallel, and the connection is not limited thereto.
For each battery cluster 2, the management unit located at the level of the battery pack 4 may collect the operation information thereof, for example, collect the voltage, current, state of charge, etc. of each battery pack 4, and through the operation information of each battery pack 4, the overall battery information of the battery cluster 2 may be obtained.
In this embodiment, each battery cluster 2 is physically isolated from each other, and each battery pack 4 is also physically isolated from each other in the same battery cluster 2, so as to avoid affecting other battery packs 4 or battery clusters 2 when the battery pack 4 or the battery cluster 2 fails.
Each energy storage converter 3 and each battery cluster 2 are arranged and installed in the accommodating cavity of the energy storage box body in a one-to-one correspondence manner, the input end of each energy storage converter 3 is connected with the output end of the corresponding battery cluster 2, and the output end of each energy storage converter is suitable for being connected with the power grid end 6; here, the energy storage converter 3 is used to realize a direct current to alternating current and a bidirectional conversion of the current from alternating current to direct current.
Referring to fig. 2, the internal construction of the energy storage converter 3 described above is shown.
The energy storage converter 3 comprises a direct current contactor 31, an isolating switch 32, a DC/AC bidirectional converter 33 and an alternating current contactor 34.
The first end of the DC contactor 31 is connected to the input end of the battery cluster 2 corresponding to the energy storage converter 3, the second end is connected to the first end of the isolating switch 32, the second end of the isolating switch 32 is connected to the first end of the DC/AC bidirectional converter 33, the second end of the DC/AC bidirectional converter 33 is connected to the first end of the AC contactor 34, and the second end of the AC contactor 34 is connected to the grid end 6.
The dc contactor 31 includes a dc main contactor 311 and a dc pre-charge contactor 312 connected in parallel, and the dc pre-charge contactor 312 includes a dc pre-charge resistor 3121 and a dc pre-charge relay 3122 connected in series.
Specifically, the direct current side of the energy storage converter 3 includes a positive electrode line and a negative electrode line, and first ends of the positive electrode line and the negative electrode line are respectively connected to the total positive electrode output end and the total negative electrode output end of the corresponding battery cluster 2; the positive electrode line and the negative electrode line are respectively provided with a direct current main contactor 311, when both are closed, the output of the battery cluster 2 is conducted to the energy storage converter 3, and when both are open, the output of the battery cluster 2 is disconnected. In other embodiments, a current sensor may be further disposed on the positive electrode line to collect current information on the positive electrode line, so as to detect current on the positive electrode line, and determine whether the battery cluster 2 has abnormal conditions such as overcurrent, overheat, short circuit, overvoltage or undervoltage in real time. In addition, in other embodiments, a fuse may be further disposed in series on the positive electrode line or the negative electrode line, and when the current is too large, the connection between the battery cluster 2 and the power grid end 6 is directly turned off, so as to ensure that the battery cluster 2 is free from being affected.
The two dc pre-charging contactors 312 are respectively connected in parallel with the two dc main contactors 311 in the above-mentioned positive electrode line and negative electrode line, and before the dc main contactors 311 need to be closed, the dc main contactors 311 can be charged through the dc pre-charging contactors 312, so as to avoid damage to the capacitor devices in the dc main contactors 311 caused by excessive instantaneous current during the closing.
In the present embodiment, the isolating switch 32 is disposed between the DC contactor 31 and the DC/AC bidirectional converter 33, and in other embodiments, it may be disposed between the output of the battery cluster 2 and the DC contactor 31. When the battery cluster 2 is in abnormal states such as overcurrent, overheat, short circuit, overvoltage or undervoltage, the isolating switch 32 can be opened to cut off the positive electrode line and the negative electrode line, and after the fault of the battery cluster 2 is removed, the isolating switch 32 is closed to simultaneously conduct the positive electrode line and the negative electrode line.
The DC/AC bi-directional converter 33 may be a non-isolated converter or an isolated converter, and it is considered that in the present embodiment, each energy storage converter 3 is only disposed corresponding to one battery cluster 2, and the power thereof is smaller, so as to reduce the cost of the energy storage container 1, a non-isolated converter may be used. Of course, in other embodiments, an isolated converter is also possible to output a more stable three-phase alternating current.
Taking a non-isolated converter as an example, the full-bridge reversible SPWM rectifier circuit comprises four switching tubes and a Buck-Boost type bidirectional DC/DC conversion circuit. When the converter is in a charging mode, that is, the alternating current of the power grid end 6 is converted into direct current and is input into the battery cluster 2, the full bridge can work in an SPWM rectification state, the alternating current of the power grid end 6 is converted into direct current and is output to the direct current bus, and then the direct current/direct current converter circuit is used for charging the battery cluster 2 in a Buck type voltage reduction mode. When the converter is in a discharging mode, that is, the direct current of the battery cluster 2 is converted into alternating current and output to the power grid end 6, the full bridge can work in an SPWM inversion state, the direct current on the direct current bus is converted into alternating current and power is supplied to the power grid end 6, and at the moment, the DC/DC conversion circuit forms a Boost circuit to provide high voltage for the direct current bus.
Further, in this embodiment, since the battery cluster 2 is directly connected to the energy storage converter 3, both the power harness and the communication harness are short, and even if a non-isolated converter is adopted, electromagnetic interference generated by the non-isolated converter will not greatly affect the communication between the energy storage converter 3 and the battery cluster 2.
The AC contactor 34 is connected at a first end to the DC/AC bi-directional converter 33 and at the other end to the grid end 6.
Further, the output of the ac contactor 34 may be provided as an integrated output interface exposed to the energy storage tank for connection to the grid terminal 6. Specifically, the three-phase outputs of the ac contactor 34 may be arranged in a fixed order and integrated to form an integrated output interface having a fixed form, where the integrated output interface has a corresponding identifier corresponding to each phase, and when the energy storage converter 3 is connected to the copper bar of the transformer, each phase of the integrated output interface may be connected to the copper bar of the corresponding phase of the transformer, and the self-adaptation of the three-phase output phase of the energy storage converter 3 and the phase of the grid end 6 is implemented through wire matching.
The following describes a part of the control method in the present embodiment.
Based on the above energy storage container 1, according to different working modes, the following control methods are adopted respectively:
when the energy storage container 1 works in a grid-connected mode, the direct current contactor 31, the DC/AC bidirectional converter 33 and the alternating current contactor 34 are sequentially closed when the energy storage converter is started;
when the energy storage container 1 works in the off-grid mode, the direct current contactor 31, the alternating current contactor 34 and the DC/AC bidirectional converter 33 are sequentially closed when the energy storage converter is started.
When each energy storage converter 3 works, battery information of the corresponding battery cluster 2 and output power of other energy storage converters 3 are collected, and the output power of the energy storage converters 3 is adjusted by combining the output power required by the energy storage container 1. The battery information therein may include the total voltage, total current and/or total state of charge of the battery cluster 2.
Meanwhile, when each energy storage converter 3 works, state information of the corresponding battery cluster 2 is collected, and when the state information shows that the battery cluster 2 works abnormally, the direct current contactor 31 is disconnected, the alternating current contactor 34 is disconnected, and the DC/AC bidirectional converter 33 is closed in sequence.
Specifically, the above-mentioned operation in the grid-connected mode means that the energy storage container 1 is connected to the high-voltage power grid, and can be used to transmit electric energy to the high-voltage power grid or take electric energy from the high-voltage power grid to charge the electric energy. Taking the energy storage container 1 as an example of working in the grid-connected output mode, at this moment, the energy storage converter 3 needs to convert the direct current of the battery cluster 2 into alternating current and then transmit the alternating current to the alternating current bus, and then transmit the alternating current to the high-voltage power grid through the alternating current bus, in order to avoid voltage impact of the high-voltage power grid on the internal devices of the energy storage converter 3, when the energy storage converter 3 is started, the direct current pre-charging contactor 312 is firstly closed, the direct current main contactor 311 is then closed, driving pulse is input to the DC/AC bidirectional converter 33, the DC/AC bidirectional converter 33 is controlled to work through the driving pulse and the output voltage is delayed, then the alternating current main contactor 341 is closed, the connection between the energy storage converter 3 and the alternating current bus is conducted, and the energy storage converter 3 can output the alternating current to the alternating current bus.
When the energy storage container 1 works in the off-grid output mode, the energy storage converter 3 converts the direct current of the battery cluster 2 into alternating current and transmits the alternating current to the alternating current bus, and then the alternating current bus transmits the electric energy to other electric loads connected with the alternating current bus, at the moment, the alternating current bus is not connected with a high-voltage power grid, so that the voltage impact of the high-voltage power grid on the internal devices of the energy storage converter 3 is not required, when the energy storage converter 3 is started, the direct current pre-charging contactor 312 is firstly closed, the direct current main contactor 311 is closed, the alternating current main contactor 341 is closed, driving pulses are input to the DC/AC bidirectional converter 33, and the DC/AC bidirectional converter 33 is controlled to work through the driving pulses and outputs the alternating current to the alternating current bus.
During the operation of the energy storage converter 3, the battery information of the corresponding battery cluster 2 and the output power of other energy storage converters 3 can be collected through a communication line. In the system control of the energy storage container 1, the total power required to be output is sent to the energy storage container 1, the energy storage container 1 controls each energy storage converter 3 to work according to the total power, and after the battery information of the battery cluster 2 and the output power of other energy storage converters 3 are obtained, the output power of each energy storage converter 3 can be adjusted based on the information. For example, when the total charge state of a certain battery cluster 2 is low, the output power of the energy storage converter 3 corresponding to the battery cluster 2 can be reduced, and meanwhile, other energy storage converters 3 can adjust up or maintain the output power according to the total charge state of the corresponding battery cluster 2, so that the discharge balance of each battery cluster 2 is realized, and independent control and management of each battery cluster 2 can be realized.
Meanwhile, the energy storage converter 3 can also collect the state information of the corresponding battery cluster 2 through a communication line, the state information is used for identifying the working state of the battery cluster 2, such as whether the battery cluster 2 is over-voltage, over-current, under-voltage and the like, when abnormal conditions occur, the energy storage converter 3 can sequentially close the DC/AC bidirectional converter 33, disconnect the AC contactor 34 and the DC contactor 31, and the influence of the battery cluster 2 on the corresponding energy storage converter 3 or the influence of the AC bus on other battery clusters 2 or electric loads can be avoided.
The control method described above may be implemented by a control device 5 disposed in the energy storage converter, where the control device 5 includes a memory and a processor, the memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory, and execute the control method for the energy storage container 1 provided in this embodiment.
The computer program may be divided into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present invention, for example. The modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the control device 5.
The control device 5 may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the control device 5 may comprise more or fewer components, or may combine certain components, or different components, e.g., the control device 5 may also comprise input and output devices, network access devices, buses, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may be an internal storage unit of the control device 5, such as a hard disk or a memory of the control device 5. The memory may also be an external storage device of the control device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the control device 5. Further, the memory may also include both an internal memory unit and an external memory device of the control device 5. The memory is used for storing computer programs and other programs and data required by the control device 5. The memory may also be used to temporarily store data that has been output or is to be output.
Corresponding to the control device 5, it also establishes communication connection with the corresponding battery cluster 2 and other energy storage converters 3 and the BMS of the energy storage container 1 through communication lines, so as to acquire the battery information, state information, output power of the other energy storage converters 3, total power to be output by the energy storage container 1 and other information of the battery cluster 2.
The energy storage container 1 provided by the embodiment is internally provided with a plurality of battery clusters 2 and energy storage converters 3 which are connected in a one-to-one correspondence manner, and the energy storage converters 3 are independently connected with a power grid end 6, so that the charge and discharge of each battery cluster 2 can be realized through the energy storage converters 3; the original high-voltage box is removed from the energy storage container 1, the on-off of the output of the battery clusters 2 is controlled by the energy storage converter 3, the large energy storage converter 3 outside the original energy storage container 1 is removed, compared with the conventional energy storage system, the occupied area is smaller, the use is more convenient, an independent energy storage converter 3 is not needed to be equipped, the energy storage container 1 can adopt the low-power energy storage converter 3, the manufacturing cost is reduced, meanwhile, the output power of each battery cluster 2 can be adjusted through the energy storage converter 3, the response rate can be improved, the current loss is reduced, and the discharge balance among the battery clusters 2 is realized; in addition, as the high-voltage box is removed, and the energy storage current transformer 3 is arranged for each battery cluster 2, the connection between the corresponding battery cluster 2 and the power grid end 6 can be directly controlled through each energy storage current transformer 3, so that the control complexity is greatly reduced only by controlling the energy storage current transformer 3, and the situation that the connection between the battery cluster 2 and the power grid end 6 is not matched can be avoided; meanwhile, when the energy storage container 1 is controlled, the energy storage container 1 is divided into a grid-connected mode and a grid-off mode according to different working modes, and different operation modes are adopted for starting the energy storage converter in different modes, wherein when the energy storage container 1 is started in the grid-connected mode, the energy storage converter is sequentially closed or started in the sequence of a direct current contactor 31, a DC/AC bidirectional converter 33 and an AC contactor 34, in the process, the DC/AC bidirectional converter 33 is started with the AC contactor 34 first, so that the voltage on the AC side of the DC/AC bidirectional converter 33 is slowly started, and then when the AC contactor 34 is closed, the high voltage at the power grid end 6 cannot impact a capacitor device in the energy storage converter 3, so that the safety of internal devices of the energy storage converter 3 is ensured; when the power grid is started in the off-grid mode, the direct current contactor 31, the alternating current contactor 34 and the DC/AC bidirectional converter 33 are sequentially closed or started, and the high voltage at the power grid end 6 can not impact the capacitor device in the energy storage converter 3 in the off-grid mode, so that the DC contactor 31 and the alternating current contactor 34 can be closed first and then the DC/AC bidirectional converter 33 is started, and the output efficiency and the response speed of the energy storage converter 3 are improved.
The foregoing description of the embodiments and description is presented to illustrate the scope of the invention, but is not to be construed as limiting the scope of the invention. Modifications, equivalents, and other improvements to the embodiments of the invention or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the invention or the teachings of the embodiments, are intended to be included within the scope of the invention, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.
Claims (8)
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