CN110768282B - Energy storage device and power distribution device - Google Patents
Energy storage device and power distribution device Download PDFInfo
- Publication number
- CN110768282B CN110768282B CN201911127235.6A CN201911127235A CN110768282B CN 110768282 B CN110768282 B CN 110768282B CN 201911127235 A CN201911127235 A CN 201911127235A CN 110768282 B CN110768282 B CN 110768282B
- Authority
- CN
- China
- Prior art keywords
- phase
- battery pack
- energy storage
- power
- control signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention relates to an energy storage device and a power distribution device. The device includes: a plurality of battery packs; the energy management system is used for acquiring phase current of each phase of the transformer; the three-phase module comprises three units, each unit comprises a control module and a current converter, the control module selects the battery pack to be connected into each unit according to a first control signal, each current converter collects the charging and discharging power of the battery pack of each unit, and the current converter controls the charging and discharging and direct/alternating current conversion of the battery pack of the unit according to a second control signal; and the operation module receives and sends a first control signal and a second control signal according to the phase current and the charge and discharge power of the battery pack so as to balance the three phases of the transformer. The three units of the three-phase module are mutually independently controlled, the capacity of the battery pack can be fully utilized by controlling the charging of the battery pack of one phase with low phase current and the discharging of the battery pack of one phase with high phase current, the investment is reduced, the space is saved, and the capacity for improving the problems of unbalanced three phases in urban villages and rural areas and insufficient peak power utilization capacity is improved.
Description
Technical Field
The invention relates to the technical field of electricity, in particular to an energy storage device and a power distribution device.
Background
Along with the development of society, the types of electric equipment of urban residents are more and more, especially, the equipment controlled by electronic devices puts forward higher requirements on the power supply voltage of a user terminal, but along with the rapid development of the construction of urban villages, the power consumption demand is continuously increased, the power consumption load of a transformer area of the urban villages is rapidly increased, during the power consumption peak period, the relevant power supply equipment such as a distribution transformer, a low-voltage distribution network and the like is seriously overloaded and operated, so that the urban villages frequently have power failure, the power supply voltage of the user terminal is unstable, the voltage of a terminal user is lower, the power quality is poorer, and the three-phase imbalance condition of low-voltage outgoing lines of the transformer is serious. Meanwhile, the power equipment in the rural areas in cities and villages is not enough in land and cannot be matched with the power demand in a short time, so that the problem of difficult power utilization in the rural areas in cities and villages is more and more serious.
Disclosure of Invention
In view of the above, it is desirable to provide an energy storage device and a power distribution device.
An energy storage device for accessing a power distribution network and cooperating with the power distribution network for supplying power, comprising:
a plurality of battery packs; the energy management system is used for acquiring phase currents of all phases at the low-voltage outgoing line side of the distribution transformer; the three-phase module comprises three units, each unit comprises a control module and a current converter, the current converters of the three units are respectively used for connecting one phase of the low voltage outgoing line side of the distribution transformer, each control module is used for selecting a battery pack to be accessed to the unit where the control module is located according to a first control signal, each current converter is also used for collecting the charging power or the discharging power of the battery pack accessed to the unit where the current converter is located, and the current converter is also used for controlling the charging, the discharging and the direct current/alternating current conversion of the battery pack accessed to the unit where the current converter is located according to a second control signal; and the operation module is used for receiving and sending the first control signal and the second control signal according to the phase current acquired by the energy management system and the charging power or the discharging power of the battery pack acquired by the current converter so as to balance the three phases of the distribution transformer.
In one embodiment, the negative electrodes of the battery packs are connected in parallel and then electrically connected to the converters, the energy storage device further includes a plurality of control switches and stationary contacts equal to the number of the battery packs, each stationary contact is connected to the positive electrode of one battery pack in a one-to-one correspondence, each control switch is connected to two adjacent stationary contacts, so that all the stationary contacts are connected in series through the control switches, each control module includes a movable contact, and each control module is configured to select a unit in which the battery pack is connected to the control module according to the first control signal includes: the movable contact of each control module is connected with a fixed contact according to the first control signal, and the control module controls the closing of a control switch between the fixed contacts corresponding to the battery pack to be accessed according to the first control signal.
In one embodiment, the energy management system is further configured to collect phase voltages of phases on a low-voltage outlet side of a distribution transformer and electric quantities of the battery packs, and the operation module is configured to receive and send the first control signal and the second control signal according to the phase currents, the phase voltages, the electric quantities of the battery packs and charging power or discharging power of the battery packs collected by the converter, which are collected by the energy management system.
In one embodiment, the operation module is configured to receive and send the first control signal and the second control signal according to the phase current, the phase voltage, the electric quantity of each battery pack, and the charging power or the discharging power of the battery pack, which are collected by the energy management system, and the charging power or the discharging power of the battery pack is collected by the inverter, and includes: the operation module obtains a three-phase balance target value according to the received phase current, the phase voltage and the electric quantity of each battery pack; when the phase current of one phase of the low-voltage outgoing line side of the distribution transformer is smaller than the three-phase balance target value, the operation module sends a second control signal for controlling the charging of the battery pack to the corresponding converter, and when the phase current of one phase of the low-voltage outgoing line side of the distribution transformer is larger than the three-phase balance target value, the operation module sends a second control signal for controlling the discharging of the battery pack to the corresponding converter.
In one embodiment, the operation module is further configured to send a first control signal for replacing the battery pack connected to the control module of each unit and a second control signal for controlling charging and discharging and dc/ac conversion of the battery pack connected to each unit according to the received phase current, phase voltage, electric quantity of each battery pack, and charging power or discharging power of the battery pack collected by the inverter.
In one embodiment, the energy storage capacities of the battery packs in the energy storage device are the same, and the energy storage device comprises more than or equal to 2 battery packs.
In one embodiment, the energy storage device further comprises a detection module located between a converter in each unit of the three-phase module and one phase of the low voltage outgoing line side of the distribution transformer, the detection modules correspond to the converters one to one, and the detection module is used for connecting the energy storage device and the distribution network according to the received charging and discharging control signals sent by the operation module.
In one embodiment, the three-phase balance target value is less than or equal to a load upper limit value of a distribution transformer, wherein the load upper limit value of the distribution transformer is set to be 1 time or 0.8 time of a transformer rating value of the distribution transformer.
In one embodiment, the battery pack in the energy storage device includes at least one of a lithium iron phosphate battery, a sodium-sulfur battery, a flow battery, a lead-acid battery, a power capacitor battery, a nano capacitor battery, a nickel-hydrogen power capacitor battery, and a capacitive lithium battery.
Above-mentioned energy memory for insert the distribution network and cooperate the distribution network to supply power, its characterized in that includes: a plurality of battery packs; the energy management system is used for acquiring phase currents of all phases at the low-voltage outgoing line side of the distribution transformer; the three-phase module comprises three units, each unit comprises a control module and a current converter, the current converters of the three units are respectively used for connecting one phase of the low voltage outgoing line side of the distribution transformer, each control module is used for selecting a battery pack to be accessed to the unit where the control module is located according to a first control signal, each current converter is also used for collecting the charging power or the discharging power of the battery pack accessed to the unit where the current converter is located, and the current converter is also used for controlling the charging, the discharging and the direct current/alternating current conversion of the battery pack accessed to the unit where the current converter is located according to a second control signal; and the operation module is used for receiving and sending the first control signal and the second control signal according to the phase current acquired by the energy management system and the charging power or the discharging power of the battery pack acquired by the current converter so as to balance the three phases of the distribution transformer. The energy storage device controls the battery pack connected to each phase to charge or discharge according to the phase current of each phase at the low-voltage outlet side of the distribution transformer, namely, the battery pack of one phase with low phase current is charged and the battery pack of one phase with high phase current is discharged, so that the problem of three-phase imbalance of the distribution transformer can be solved. The three units of the three-phase module are mutually independently controlled, so that the capacity of the battery pack can be fully utilized, the investment is reduced, the space is saved, and the capacity for improving the three-phase imbalance of the urban rural area and the problem of insufficient peak power utilization capacity of the urban rural area is improved. Meanwhile, the energy storage device can be used as an important means for operating without power failure and reducing the number of households in power failure in the process of power distribution network equipment maintenance or power grid transformation. When the public transformer has power failure due to maintenance or power grid transformation and other reasons, the energy storage device can be used as a temporary power supply after the transformer is isolated, and can independently supply power for a back-end user within a certain time, so that the function of uninterrupted operation is realized.
The utility model provides a distribution device, is including setting up the distribution transformer between electric wire netting side and user side, distribution device still includes any one of the aforesaid energy memory, energy memory installs in parallel distribution transformer low-voltage line side low pressure shunt switch anterior segment, energy memory is used for improving for a short time distribution transformer's power supply capacity, energy memory still is used for balancing distribution transformer's three-phase is exerted a force, distribution device is used for supplying power to the user.
The power distribution device comprises a power distribution transformer arranged between a power grid side and a user side, and is characterized by further comprising any one of the energy storage devices, the energy storage devices are installed in parallel on the front section of the low-voltage shunt switch on the low-voltage outgoing line side of the power distribution transformer, the energy storage devices are used for improving the power supply capacity of the power distribution transformer in a short time, the energy storage devices are further used for balancing the three-phase output of the power distribution transformer, and the power distribution device is used for supplying power to the user. The energy storage device in the distribution device controls the battery pack connected to each phase to charge or discharge according to the phase current of each phase at the low-voltage outlet side of the distribution transformer, namely controls the battery pack of one phase with low phase current to charge and the battery pack of one phase with high phase current to discharge, so that the problem of three-phase imbalance of the distribution transformer can be solved. The three units of the three-phase module are mutually independently controlled, so that the capacity of the battery pack can be fully utilized, the investment is reduced, the space is saved, and the capacity for improving the three-phase imbalance of the urban rural area and the problem of insufficient peak power utilization capacity of the urban rural area is improved. Meanwhile, the energy storage device in the power distribution device can be used as an important means for operating without power outage and reducing the number of households in power outage in the process of power distribution network equipment maintenance or power grid transformation. When the public transformer has power failure due to maintenance or power grid transformation and other reasons, the energy storage device can be used as a temporary power supply after the transformer is isolated, and can independently supply power for a back-end user within a certain time, so that the function of uninterrupted operation is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 of the present invention, and for those skilled in the art, other drawings of the embodiments can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of an embodiment of an energy storage device;
fig. 2 is a block diagram of a battery pack in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, in an embodiment of the present application, an energy storage device is provided for accessing to a power distribution network and cooperating with the power distribution network to supply power, and the energy storage device includes:
a plurality of battery packs 102, which are dc battery packs; in one embodiment, the energy storage capacities of the battery packs 102 in the energy storage devices are the same, the energy storage devices include 2 or more battery packs 102, within a certain range, the more battery packs in the energy storage devices, the smaller the capacity of the battery packs, and the higher the precision in adjusting the three-phase balance on the low-voltage outlet side of the distribution transformer, the energy storage capacity of the battery packs and the number of the battery packs may be selected as needed in the practical application process, for example, the number of the battery packs is 12,14,16,18,20,24,25, and the like.
In one embodiment, the battery pack in the energy storage device includes at least one of a lithium iron phosphate battery, a sodium-sulfur battery, a flow battery, a lead-acid battery, a power capacitor battery, a nano capacitor battery, a nickel-hydrogen power capacitor battery, and a capacitance type lithium battery. In one embodiment, the battery pack in the energy storage device is formed by connecting a plurality of batteries in parallel.
In one embodiment, the battery pack 102 in the energy storage device is installed in a battery cabinet, and the battery cabinet is designed in an integrated prefabricated manner, so that the battery cabinet can be used in a plug-and-play manner, is convenient to transport, install and use, can effectively save floor space, and can also adjust the total capacity of the battery pack in the energy storage device for many times according to the load requirements of the distribution transformer. Meanwhile, the battery pack is provided with an all-around and multi-stage battery pack protection strategy and fault isolation measures, and the safety is high. In one embodiment, an industrial air conditioner is installed on a cabinet door of the battery cabinet, and cold air is blown to the battery pack through a centrifugal fan, so that the purposes of cooling and dehumidifying the environment in the battery cabinet are achieved.
The energy management system 104 is configured to collect phase currents of the phases on the low-voltage outlet side of the distribution transformer, that is, collect phase currents of the three phases on the low-voltage outlet side of the distribution transformer.
The three-phase module 108 includes three units, each unit 110 includes a control module and a converter, the converters of the three units are respectively used for connecting one phase of each phase of the low voltage outgoing line side of the distribution transformer, each control module is used for selecting a unit where the battery pack 102 is accessed to the control module according to the first control signal, each converter is further used for collecting charging power or discharging power of the battery pack accessed to the unit 110 where the converter is located, and the converter is further used for controlling charging and discharging of the battery pack accessed to the unit 110 where the converter is located and direct current/alternating current conversion, namely conversion of a rectification state/an inversion state according to the second control signal. And each control module selects the number of the battery packs accessed to the unit where the control module is located to be more than or equal to 0 and less than or equal to the total number of the battery packs in the energy storage device according to the first control signal. The three control modules select the sum of the number of the battery packs accessed to the unit where the control module is located to be greater than or equal to 0 and less than or equal to the total number of the battery packs in the energy storage device according to the first control signal.
In one embodiment, each of the inverters feeds back the detected data to the energy management system in real time, and then sends the charging power or the discharging power of the battery pack to the operation module, and the operation module sends a first control signal and a second control signal for adjusting the charging and discharging power of the battery pack in real time to the three-phase module according to the received charging power or the received discharging power of the battery pack when necessary. In one embodiment, the converter detects the charging power or the discharging power of the battery pack connected to the unit where the converter is located through the electric energy meter.
In one embodiment, when the energy storage device is connected to the power distribution network, i.e., when a battery pack charging/discharging state exists, after a fixed period of time (60 s in this example), the energy management system collects the phase voltages of the phases at the low-voltage outlet side of the distribution transformer, the electric quantity of each battery pack 102, and the charging power or the discharging power of the battery pack of the unit where the access converter is located, which are collected by the converter, again, the operation module 106 receives and sends new first and second control signals according to the phase currents and the phase voltages of the phases at the low-voltage outlet side of the distribution transformer, which are collected by the energy management system 104, the electric quantity of each battery pack, and the charging power or the discharging power of the battery pack of the unit where the access converter is located, which is collected by the converter, therefore, the state of the energy storage battery pack connected to the power distribution network is periodically corrected, and the condition that the load of the transformer changes continuously is responded.
And the operation module 106 is configured to receive and send a first control signal and a second control signal according to the phase current acquired by the energy management system 104 and the charging power or the discharging power of the battery pack of the unit 110 where the inverter is located, which is acquired by the inverter, so that the three phases on the low voltage outgoing line side of the distribution transformer are balanced.
In one embodiment, the energy management system 104 is further configured to collect phase voltages of the phases on the low-voltage outlet side of the distribution transformer and the electric quantity of each battery pack 102, and the operation module 106 is configured to receive and send the first control signal and the second control signal according to the phase current, the phase voltage, the electric quantity of each battery pack of the phases on the low-voltage outlet side of the distribution transformer collected by the energy management system 104 and the charging power or the discharging power of the battery pack of the unit 110 where the converter is located collected by the converter.
In one embodiment, after the energy storage device is connected to the power distribution network, the energy management system acquires phase voltages and phase currents of phases on a low-voltage outlet side of the distribution transformer and electric quantity of each battery pack, namely energy storage condition of each battery pack, through the voltage transformer and the current transformer, and transmits acquired data to the operation module through the data line.
In one embodiment, the control module comprises a contactor, a battery cluster management unit (BCMS), a direct current monitoring unit (DMU), a shunt and a pre-charging resistor, the control module is a control part for the operation of the whole battery cluster, and the main function of the control module is to cooperate with a battery stack management system (BAMS) to perform safe management on the charging and discharging processes of the battery cluster, so as to ensure that the battery pack operates safely, reliably and stably.
In one embodiment, the operation module obtains parameters such as power, load factor and three-phase imbalance of each phase according to the received phase voltage and phase current of each phase at the low-voltage outgoing line side of the distribution transformer, and obtains a first control signal and a second control signal according to the electric energy storage condition of each battery pack at the moment, namely obtains the connection condition of each battery pack and three units in the three-phase module and the charging and discharging state of each unit battery pack, and the control module adjusts three movable contacts to be connected with corresponding stationary contacts according to the received first control signal, controls the on and off of control switches between adjacent battery packs at the same time, and closes the switches in the control module. And the current converter is adjusted to be in a rectifying state or an inverting state according to the received second control signal.
In one embodiment, the converter comprises a bidirectional converter or a converter combined by a rectifier and an inverter.
In one embodiment, the cathodes of the battery packs 102 are connected in parallel and then electrically connected to the inverters, the energy storage device further includes a plurality of control switches 112 and stationary contacts 114 with the same number as the battery packs 102, each stationary contact 114 is connected to the positive electrode of one battery pack 102 in a one-to-one correspondence, that is, each battery pack is connected to one stationary contact, each control switch 112 is connected to two adjacent stationary contacts 114, that is, the positive electrodes of two adjacent battery packs are connected in parallel through one control switch, so that all the stationary contacts 114 are connected in series through the control switches 112. Each control module comprises a movable contact 116, the movable contact 116 of each control module is connected with a fixed contact 114 according to the first control signal, and the control module controls the closing of the control switch 112 between the fixed contacts 114 corresponding to the battery pack 102 to be accessed according to the first control signal; that is, the control module in each unit 110 controls the movable contact 116 connected thereto to connect a fixed contact 114 according to the received first control signal, and the control module controls the closing of the control switch 112 between the battery packs 102 to be connected to the control module according to the first control signal.
In one embodiment, the operation module 106 is configured to receive and send the first control signal and the second control signal according to the phase current, the phase voltage, the electric quantity of each battery pack, and the charging power or the discharging power of the battery pack collected by the inverter of each phase on the low-voltage outlet side of the distribution transformer collected by the energy management system 104, and includes: the operation module 106 obtains a three-phase balance target value X according to the received phase current and phase voltage of each phase and the electric quantity of each battery pack, wherein the three-phase balance target value X is a stable value of each phase to be reached after the phase current and the phase voltage of each phase on the low-voltage outlet side of the distribution transformer are adjusted through the energy storage device, and the three-phase balance target value X is finely adjusted according to the received phase current and phase voltage of each phase, the electric quantity of each battery pack and the charging power or the discharging power of each battery pack collected by the converter; when the phase current of one phase on the low-voltage outgoing line side of the distribution transformer is smaller than the three-phase balance target value X, the operation module 106 sends a second control signal for controlling the charging of the battery pack 102 to the corresponding converter, that is, the phase converter controls all the battery packs connected to the unit where the converter is located to be charged, so as to improve the phase current of the phase; when the phase current of one phase on the low-voltage outgoing line side of the distribution transformer is greater than the three-phase balance target value X, the operation module 106 sends a second control signal for controlling the battery pack 102 to discharge to the corresponding converter, that is, the phase converter controls all the battery packs connected to the unit where the converter is located to discharge, so as to reduce the phase current of the phase. When the capacity of the distribution transformer is insufficient, the stored electric quantity is provided for the distribution transformer, the power supply capacity of the transformer is improved in a short time, and the effects of peak clipping and valley filling are achieved.
In one embodiment, the three-phase balance target value X is less than or equal to a load upper limit value of the distribution transformer, wherein the load upper limit value of the distribution transformer is set to be 1 times of a transformer rating of the distribution transformer. In other embodiments, the load upper limit of the distribution transformer may be set to any value less than or equal to the transformer rating of the distribution transformer.
In one embodiment, the operation module 106 is further configured to send a first control signal for replacing the battery pack 102 connected to the control module in each unit 110 and a second control signal for controlling charging, discharging and dc/ac conversion of the battery pack 102 connected to each unit 110 according to the received phase current, phase voltage, electric quantity of each battery pack, and charging power or discharging power of the battery pack collected by the inverter.
In one embodiment, energy management system 104 monitors phase currents and phase voltages of the phases on the low voltage drop side of the distribution transformer in real time, i.e., load data for the phases, and sends the collected data to the operation module 106 in real time, after the operation module calculates the obtained three-phase balance initial target value, namely the adjusted initial target current value of each phase, calculating the three-phase unbalance degree of the transformer low voltage outgoing line side and the current difference value of each phase according to the received load data of each phase monitored by the energy management system in real time, the battery pack is divided into three parallel batteries of different capacities connected to three phases respectively by transmitting a first control signal and a second control signal to the three-phase module, the number of the battery packs in the parallel batteries is more than or equal to 0 and less than or equal to the total number of the battery packs in the energy storage device, so that charging or discharging is carried out between the three phases on the low voltage outgoing line side.
In one embodiment, the energy storage device further includes a detection module 118 located between the inverter in each unit of the three-phase module 108 and one phase of the low voltage outgoing line side of the distribution transformer, the detection module 118 corresponds to the inverters one by one, and the detection module 118 is configured to connect the energy storage device and the distribution network according to the received charge and discharge control signal sent by the operation module, that is, the detection module controls the protection switch to be closed after receiving the charge and discharge control signal sent by the operation module, so as to connect the energy storage device and the distribution network. In one embodiment, the detection module includes an abnormality warning device and a protection switch for emergency removal of the battery pack.
In one embodiment, when a battery pack in the energy storage device discharges to reach a first electric quantity or charges to reach a second electric quantity, the operation module sends a first control signal and a second control signal for adjusting the battery pack connected to a unit where each control module is located. The first electric quantity can be any value of 10% -30% of the electric quantity of each battery pack, the first electric quantity is a limit value of the lowest electric quantity of the manually set battery pack, the second electric quantity can be any value of 70% -90% of the electric quantity of each battery pack, the second electric quantity is a limit value of the highest electric quantity of the manually set battery pack, and the number of the battery packs can be any value which is greater than or equal to 1 and less than or equal to the total number of the battery packs in the energy storage device.
In one embodiment, the energy storage device further comprises a temperature and humidity sensor for detecting an ambient temperature and an ambient humidity in the energy storage device.
As shown in fig. 2, the number of battery packs in the energy storage device is 16, and the system, module, and the like between each battery pack in the energy storage device and each phase on the low-voltage outlet side of the distribution transformer are omitted in the figure.
At a certain moment, the energy management system detects that three-phase currents of the distribution transformer are 15 amperes of an A phase, 20 amperes of a B phase and 25 amperes of a C phase respectively, three-phase voltages are 220 volts, electric quantities of 16 battery packs are 50% of energy storage capacity of the battery packs, the energy management system collects the data and sends the data to the operation module, the operation module obtains three-phase balance target values of 20 amperes of current and 220 volts according to the received data, and meanwhile, the first control signal and the second control signal are sent to the three-phase module, the first control signal and the second control signal are used for enabling No. 1-8 battery packs to be connected into the A phase for charging and enabling No. 9-16 battery packs to be connected into the C phase for discharging. After receiving a first control signal, the control module connected with A controls the movable contact connected with A to be connected with the fixed contact 20 corresponding to the anode of the battery pack No. 1, and simultaneously controls the control switches between the battery packs No. 1-8 to be completely closed, and after receiving a second control signal, the current converter connected with A controls the battery packs No. 1-8 to be charged and simultaneously controls the current converter to be in a rectification state; after receiving the first control signal, the control module connected with C controls the movable contact connected with C to be connected with the fixed contact 21 corresponding to the positive electrode of the No. 16 battery pack, and simultaneously controls the control switches between the No. 9-16 battery packs to be completely closed, and after receiving the second control signal, the converter connected with C controls the No. 9-16 battery packs to discharge and simultaneously controls the converter to be in an inversion state; at this time, the control switch 30 between the battery pack No. 8 and the battery pack No. 9 is in the off state. The charging power and the discharging power of each phase are regularly monitored by the current converter, when the three-phase current of the transformer to be distributed is adjusted to 20 amperes, the charging and discharging states of the battery packs are kept unchanged until the fact that the electric quantity of one battery pack in the No. 1-8 battery packs is increased to 90 percent or the electric quantity of one battery pack in the No. 9-16 battery packs is reduced to 10 percent or the load of the distribution transformer is changed is detected. If the load of the distribution transformer is not changed, and the state that the electric quantity of the No. 1-8 battery pack is increased to 90% or the electric quantity of the No. 9-16 battery pack is decreased to 10% at the same time may occur, the operation module sends a first control signal and a second control signal for connecting the No. 9-16 battery pack to the phase A for charging and connecting the No. 1-8 battery pack to the phase C for discharging to the control module and the converter.
Above-mentioned energy memory for insert the distribution network and cooperate the distribution network to supply power, its characterized in that includes: a plurality of battery packs; the energy management system is used for acquiring phase currents of all phases at the low-voltage outgoing line side of the distribution transformer; the three-phase module comprises three units, each unit comprises a control module and a current converter, the current converters of the three units are respectively used for connecting one phase of the low voltage outgoing line side of the distribution transformer, each control module is used for selecting a battery pack to be accessed to the unit where the control module is located according to a first control signal, each current converter is also used for collecting the charging power or the discharging power of the battery pack accessed to the unit where the current converter is located, and the current converter is also used for controlling the charging, the discharging and the direct current/alternating current conversion of the battery pack accessed to the unit where the current converter is located according to a second control signal; and the operation module is used for receiving and sending the first control signal and the second control signal according to the phase current acquired by the energy management system and the charging power or the discharging power of the battery pack acquired by the current converter so as to balance the three phases of the distribution transformer. The energy storage device controls the battery pack connected to each phase to charge or discharge according to the phase current of each phase at the low-voltage outlet side of the distribution transformer, namely, the battery pack of one phase with low phase current is charged and the battery pack of one phase with high phase current is discharged, so that the problem of three-phase imbalance of the distribution transformer can be solved. The three units of the three-phase module are mutually independently controlled, so that the capacity of the battery pack can be fully utilized, the investment is reduced, the space is saved, and the capacity for improving the three-phase imbalance of the urban rural area and the problem of insufficient peak power utilization capacity of the urban rural area is improved. Meanwhile, the energy storage device can be used as an important means for operating without power failure and reducing the number of households in power failure in the process of power distribution network equipment maintenance or power grid transformation. When the public transformer has power failure due to maintenance or power grid transformation and other reasons, the energy storage device can be used as a temporary power supply after the transformer is isolated, and can independently supply power for a back-end user within a certain time, so that the function of uninterrupted operation is realized.
The utility model provides a distribution device, is including setting up the distribution transformer between electric wire netting side and user side, distribution device still includes any one of the aforesaid energy memory, energy memory installs in parallel distribution transformer low-voltage line side low pressure shunt switch anterior segment, energy memory is used for improving for a short time distribution transformer's power supply capacity, energy memory still is used for balancing distribution transformer's three-phase is exerted a force, distribution device is used for supplying power to the user. The energy storage device is respectively connected to the three-phase low voltage outgoing line side of the distribution transformer through the three-phase module, and the connection between the battery pack and the three-phase low voltage outgoing line side of the distribution transformer and the function of single-phase or multi-phase simultaneous charging/discharging or partial discharging at the same time and partial charging of the battery pack and the low voltage outgoing line side of the distribution transformer are realized through the first control signal and the second control signal.
In one embodiment, the power distribution apparatus is a power distribution room including a 10 kv medium voltage power distribution room and a 400 v low voltage power distribution room.
The power distribution device comprises a power distribution transformer arranged between a power grid side and a user side, and is characterized by further comprising any one of the energy storage devices, the energy storage devices are installed in parallel on the front section of the low-voltage shunt switch on the low-voltage outgoing line side of the power distribution transformer, the energy storage devices are used for improving the power supply capacity of the power distribution transformer in a short time, the energy storage devices are further used for balancing the three-phase output of the power distribution transformer, and the power distribution device is used for supplying power to the user. The energy storage device in the distribution device controls the battery pack connected to each phase to charge or discharge according to the phase current of each phase at the low-voltage outlet side of the distribution transformer, namely controls the battery pack of one phase with low phase current to charge and the battery pack of one phase with low phase current to discharge, so that the problem of three-phase imbalance of the distribution transformer can be solved. The three units of the three-phase module are mutually independently controlled, so that the capacity of the battery pack can be fully utilized, the investment is reduced, the space is saved, and the capacity for improving the three-phase imbalance of the urban rural area and the problem of insufficient peak power utilization capacity of the urban rural area is improved. Meanwhile, the energy storage device in the power distribution device can be used as an important means for operating without power outage and reducing the number of households in power outage in the process of power distribution network equipment maintenance or power grid transformation. When the public transformer has power failure due to maintenance or power grid transformation and other reasons, the energy storage device can be used as a temporary power supply after the transformer is isolated, and can independently supply power for a back-end user within a certain time, so that the function of uninterrupted operation is realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides an energy memory for insert the distribution network and cooperate the distribution network to supply power, its characterized in that includes:
a plurality of battery packs;
the energy management system is used for acquiring phase currents of all phases at the low-voltage outgoing line side of the distribution transformer;
the three-phase module comprises three units, each unit comprises a control module and a current converter, the current converters of the three units are respectively used for connecting one phase of the low voltage outgoing line side of the distribution transformer, each control module is used for selecting a battery pack to be accessed to the unit where the control module is located according to a first control signal, each current converter is also used for collecting the charging power or the discharging power of the battery pack accessed to the unit where the current converter is located, and the current converter is also used for controlling the charging, the discharging and the direct current/alternating current conversion of the battery pack accessed to the unit where the current converter is located according to a second control signal;
the operation module is used for receiving and sending the first control signal and the second control signal according to the phase current acquired by the energy management system and the charging power or the discharging power of the battery pack acquired by the current converter so as to balance the three phases of the distribution transformer;
the energy management system is further used for acquiring phase voltages of phases at a low-voltage outlet side of the distribution transformer and electric quantity of each battery pack, and the operation module is further used for receiving and sending the first control signal and the second control signal according to the phase currents, the phase voltages, the electric quantity of each battery pack and the charging power or the discharging power of the battery pack acquired by the current converter, wherein the phase voltages, the electric quantity of each battery pack and the charging power or the discharging power of the battery pack are acquired by the energy management system;
the operation module is configured to receive and send the first control signal and the second control signal according to the phase current and the phase voltage acquired by the energy management system, the electric quantity of each battery pack, and the charging power or the discharging power of the battery pack acquired by the converter, and includes:
the operation module obtains a three-phase balance target value according to the received phase current, the phase voltage and the electric quantity of each battery pack; when the phase current of one phase of the low-voltage outgoing line side of the distribution transformer is smaller than the three-phase balance target value, the operation module sends a second control signal for controlling the charging of the battery pack to the corresponding converter, and when the phase current of one phase of the low-voltage outgoing line side of the distribution transformer is larger than the three-phase balance target value, the operation module sends a second control signal for controlling the discharging of the battery pack to the corresponding converter.
2. The energy storage device according to claim 1, wherein the cathodes of the battery packs are electrically connected to the converters after being connected in parallel, the energy storage device further comprises a plurality of control switches and a number of stationary contacts equal to the number of the battery packs, each stationary contact is connected to the anode of one battery pack in a one-to-one correspondence, each control switch is connected to two adjacent stationary contacts, so that all the stationary contacts are connected in series through the control switches, each control module comprises a movable contact, and the control modules are used for selecting a unit where the battery packs are connected to the control modules according to the first control signal, and the control modules comprise:
the movable contact of each control module is connected with a fixed contact according to the first control signal, and the control module controls the closing of a control switch between the fixed contacts corresponding to the battery pack to be accessed according to the first control signal.
3. The energy storage device of claim 1, wherein the battery pack in the energy storage device is formed by connecting a plurality of batteries in parallel.
4. The energy storage device of claim 1, wherein after the energy storage device is connected to a power distribution network, the energy management system collects phase voltages and phase currents of each phase on a low-voltage outlet side of the distribution transformer and electric quantity of each battery pack through a voltage transformer and a current transformer, and transmits the collected data to the operation module through a data line.
5. The energy storage device according to claim 1, wherein the operation module is further configured to send a first control signal for replacing the battery pack connected to the control module of each unit and a second control signal for controlling charging, discharging and dc/ac conversion of the battery pack connected to each unit according to the received phase current, phase voltage, electric quantity of each battery pack, and charging power or discharging power of the battery pack collected by the inverter.
6. The energy storage device according to claim 1, wherein the energy storage capacities of the battery packs in the energy storage device are the same, and the energy storage device comprises 2 or more battery packs.
7. The energy storage device according to claim 1, further comprising a detection module located between an inverter in each unit of the three-phase module and one phase of the low voltage outgoing side of the distribution transformer, wherein the detection module is in one-to-one correspondence with the inverter, and is configured to connect the energy storage device with the distribution network according to the received charging and discharging control signal sent by the operation module.
8. The energy storage device according to claim 1, wherein the three-phase balance target value is equal to or less than a load upper limit value of a distribution transformer, wherein the load upper limit value of the distribution transformer is set to 1 time or 0.8 time of a transformer rating of the distribution transformer.
9. The energy storage device according to claim 1, wherein the battery pack in the energy storage device comprises at least one of a lithium iron phosphate battery, a sodium sulfur battery, a flow battery, a lead-acid battery, a nano capacitor battery, a nickel-hydrogen power capacitor battery, and a capacitive lithium battery.
10. A power distribution apparatus comprising a distribution transformer disposed between a grid side and a user side, wherein the power distribution apparatus further comprises the energy storage apparatus of any one of claims 1 to 9, the energy storage apparatus is installed in parallel at a front section of a low voltage shunt switch on a low voltage outlet side of the distribution transformer, the energy storage apparatus is used for improving a power supply capacity of the distribution transformer for a short time, the energy storage apparatus is also used for balancing a three-phase output of the distribution transformer, and the power distribution apparatus is used for supplying power to a user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911127235.6A CN110768282B (en) | 2019-11-18 | 2019-11-18 | Energy storage device and power distribution device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911127235.6A CN110768282B (en) | 2019-11-18 | 2019-11-18 | Energy storage device and power distribution device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110768282A CN110768282A (en) | 2020-02-07 |
| CN110768282B true CN110768282B (en) | 2021-08-31 |
Family
ID=69338074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911127235.6A Active CN110768282B (en) | 2019-11-18 | 2019-11-18 | Energy storage device and power distribution device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110768282B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350349B (en) * | 2020-09-09 | 2024-03-29 | 浙江华云信息科技有限公司 | Three-phase load unbalance control device and control method based on transformer area |
| CN112186847A (en) * | 2020-09-25 | 2021-01-05 | 包头昊明稀土新电源科技有限公司 | Energy storage power supply auxiliary power supply system and operation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205081480U (en) * | 2015-09-17 | 2016-03-09 | 比亚迪股份有限公司 | Battery energy storage system |
| CN107863778A (en) * | 2017-12-12 | 2018-03-30 | 山东大学 | A kind of commutation energy storage type three-phase load unbalance controlling device and method |
| CN108879738A (en) * | 2018-06-21 | 2018-11-23 | 深圳市盛弘电气股份有限公司 | A kind of three-phase imbalance regulating system and method |
| CN109378849A (en) * | 2018-12-28 | 2019-02-22 | 广东电网有限责任公司 | A kind of low-voltage power distribution station area energy storage device and control method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004072813A (en) * | 2002-08-01 | 2004-03-04 | Hitachi Ltd | Power storing system |
| TWM484846U (en) * | 2012-03-29 | 2014-08-21 | Bmtpow Shenzhen Ltd | Active charge balancing system of lithium battery set |
| CN103580049A (en) * | 2013-11-04 | 2014-02-12 | 上海电力学院 | Method for adjusting power grid low-voltage circuit voltage through electric vehicle power battery |
| CN104600730A (en) * | 2015-01-21 | 2015-05-06 | 中国南方电网有限责任公司调峰调频发电公司 | Offline wireless parallel operation method of a plurality of energy storing converters in large-capacity energy storing system |
| CN106058915B (en) * | 2016-05-30 | 2018-09-14 | 华南理工大学 | A kind of active based on the more microgrids of single three-phase is grid-connected to leave net method for handover control |
| CN107696863B (en) * | 2016-08-08 | 2020-03-31 | 比亚迪股份有限公司 | Energy management system of electric automobile, control method of energy management system and electric automobile |
-
2019
- 2019-11-18 CN CN201911127235.6A patent/CN110768282B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205081480U (en) * | 2015-09-17 | 2016-03-09 | 比亚迪股份有限公司 | Battery energy storage system |
| CN107863778A (en) * | 2017-12-12 | 2018-03-30 | 山东大学 | A kind of commutation energy storage type three-phase load unbalance controlling device and method |
| CN108879738A (en) * | 2018-06-21 | 2018-11-23 | 深圳市盛弘电气股份有限公司 | A kind of three-phase imbalance regulating system and method |
| CN109378849A (en) * | 2018-12-28 | 2019-02-22 | 广东电网有限责任公司 | A kind of low-voltage power distribution station area energy storage device and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110768282A (en) | 2020-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110803051B (en) | Energy storage type charging pile and charging system | |
| CN107275691B (en) | Battery pack management and control system and control method | |
| CN102104257B (en) | Energy storage system of apartment building, integrated power management system, and method of controlling the system | |
| US20150194707A1 (en) | Battery pack, energy storage system including the battery pack, and method of operating the battery pack | |
| US9070908B2 (en) | Battery system, controlling method of the same, and energy storage system including the battery system | |
| US11329484B2 (en) | Electric energy supply device comprising a plurality of usage units which are connected in order to form strands, and method for operating such an energy supply device | |
| CN110768282B (en) | Energy storage device and power distribution device | |
| EP3846304A1 (en) | Portable charging device for electric vehicles | |
| CN103117595B (en) | Distributed direct current independent power supply system | |
| CN205029416U (en) | Little capacity distribution formula energy memory and energy storage cabinet | |
| CN104901326A (en) | Control rod drive mechanism static power supply system and energy storage system and power supply method thereof | |
| CN209982089U (en) | Energy storage system primary topological structure based on PCS and DC-DC converter stack | |
| CN203119615U (en) | Distributed direct-current independent power supply system | |
| CN112531761A (en) | Direct-current peak clipping and valley filling system, device and method | |
| KR101856628B1 (en) | Apparatus and Method for Emergency Controlling Energy Storage System | |
| CN214506654U (en) | Dynamic voltage restorer and comprehensive power quality treatment equipment | |
| CN106712245B (en) | Switching power supply system, rack and control method | |
| CN203119617U (en) | Distributed direct-current independent power supply system for transformer substation | |
| CN103117596B (en) | Distributed direct-current power supply system for substation | |
| CN205846720U (en) | A kind of low-voltage direct micro-capacitance sensor experiment porch | |
| CN116845945B (en) | User side optimized energy storage control system and method | |
| CN212207620U (en) | Battery charge-discharge test system | |
| CN214013880U (en) | Direct current peak clipping and valley filling system | |
| CN109842170A (en) | A kind of power supply system and its control method using retired battery | |
| CN109066845B (en) | Energy storage system with charge-discharge loops mutually converted |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200925 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |