CN108832646A - A kind of management system and its method suitable for dynamically reconfigurable battery energy storage system - Google Patents

A kind of management system and its method suitable for dynamically reconfigurable battery energy storage system Download PDF

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Publication number
CN108832646A
CN108832646A CN201810594602.2A CN201810594602A CN108832646A CN 108832646 A CN108832646 A CN 108832646A CN 201810594602 A CN201810594602 A CN 201810594602A CN 108832646 A CN108832646 A CN 108832646A
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energy
storage
battery
power
management
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CN201810594602.2A
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CN108832646B (en
Inventor
王飞
谢红涛
张新华
赵光锋
李沐
徐健
李伟
张松
宋士瞻
王传勇
张健
谷守雨
张恒旭
李毅
施啸寒
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Shandong University
State Grid Shandong Electric Power Co Ltd
Zaozhuang Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Shandong University
State Grid Shandong Electric Power Co Ltd
Zaozhuang Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10Flexible AC transmission systems [FACTS]

Abstract

The invention discloses a kind of management systems and its method suitable for dynamically reconfigurable battery energy storage system.Wherein, the management system suitable for dynamically reconfigurable battery energy storage system, including the energy-storage system being made of energy-storage battery group and coupled power regulating system;And battery management system, it is respectively connected with energy-storage battery group and master controller;The power regulating system is also connected with master controller;The master controller is configured as:According to power grid current state, power grid energy storage demand and energy-storage battery group current state, Collaborative Control battery management system and power regulating system, the integrated decision-making of the operating mode and charge-discharge electric power of energy-storage battery group is completed, realizes the automation of the maintenance of energy-storage battery group and maintenance.

Description

A kind of management system and its method suitable for dynamically reconfigurable battery energy storage system
Technical field
The invention belongs to battery energy storage field more particularly to a kind of management suitable for dynamically reconfigurable battery energy storage system System and method.
Background technique
With the gradual depletion of fossil energy with the mankind to the growing interest of environmental problem, clean renewable energy power generation It expands rapidly, the energy revolution iterative method of a new round.However, renewable energy has the intrinsic spy of fluctuation and randomness Sign, proposes lot of challenges to safe and stable, the economical operation of power grid.Energy storage technology is the effective means for coping with above-mentioned challenge, Constructing economy of large scale energy-storage system is significant research topic.In addition to water-storage, battery energy storage is at this stage most One of the energy storage technology for having future in engineering applications.
It is limited to current technology level, battery energy storage system needs the battery based on a large amount of stored energy capacitances and power limited Monomer (battery core) building, battery management and maintenance pressure are larger.Traditionally, battery energy storage system use is fixedly connected with mode, will Battery cell series, parallel or mixed connection constitute battery pack, and are aided with and are passively or actively equalizing circuit, reduce battery pack inconsistency Influence to overall performance.But battery energy storage system use, which is fixedly connected with mode, to be had the following problems:
(1) short -board effect and unbalanced effect reduce battery pack active volume and service life;
(2) mode based on equalizing circuit can only be in moment (latter stage of charging of such as power battery) or manual intervention Trickle charge is carried out under (such as regular manual maintenance of substation's backup power source), maintenance is carried out to battery pack;
(3) battery pack utilization efficiency is low, control flexibility is poor and maintenance process needs artificial participate in, it is difficult to adapt to charge and discharge Mode renewable energy complicated and changeable go out fluctuation stabilize, the requirement of the power grids stored energy application such as peak load shifting.
To overcome tradition to be fixedly connected with the shortcomings that grouping method is difficult to flexible modulation, reduce short -board effect and unbalanced effect The battery group mode with dynamic restructuring ability can be used in influence to battery pack overall performance.With dynamic restructuring ability Battery group mode on the basis of being fixedly connected with battery pack, full-control type power electronic switch is sealed in into battery pack, realizes battery Group controllability transformation, enables battery pack according to Power Exchange demand and battery status, and dynamic changes battery pack topological structure, into And significantly improve battery pack active volume and service life.Meanwhile dynamically reconfigurable battery pack is also more efficient battery energy storage system System control management provides outstanding platform, safeguards automatically for the battery energy storage system under the complicated applications environment such as smart grid application Provide possibility.
Battery pack controllability can be improved using dynamic restructuring thought, the novel intelligent electricity with flexibly control ability can be constructed Pond group.However, there is also following drawbacks for existing energy storage device management system:
(1) main that charging and discharging state adjustment is realized by control battery interface circuit, lack the interaction between battery pack Means, it is difficult to give full play to the technical advantage of the high controllability of dynamically reconfigurable battery system.
(2) the high controllability feature of battery pack, battery energy storage system utilization efficiency and management automation water cannot be made full use of Equal low, energy-storage system low efficiency and flexibility is poor.
Summary of the invention
In order to solve the deficiencies in the prior art, the first object of the present invention is to provide a kind of suitable for dynamically reconfigurable battery The management system of energy-storage system makes full use of the high controllability feature of battery pack, improve battery energy storage system utilization efficiency and Management automation is horizontal, and energy-storage system is more efficiently and flexible.
A kind of management system suitable for dynamically reconfigurable battery energy storage system of the invention, including by energy-storage battery group and The energy-storage system that coupled power regulating system is constituted;And
Battery management system is respectively connected with energy-storage battery group and master controller;The power regulating system also with master Controller is connected;
The master controller is configured as:According to power grid current state, power grid energy storage demand and the current shape of energy-storage battery group State, Collaborative Control battery management system and power regulating system complete the operating mode and charge-discharge electric power of energy-storage battery group The automation of the maintenance of energy-storage battery group and maintenance is realized in integrated decision-making.
Wherein, electric network state collector can be used to acquire in power grid current state, and electric network state collector acquires electricity in real time Net current status data, and it is uploaded to master controller, basic data is provided for the charge and discharge decision of energy-storage battery group.
Industrial personal computer can be used to realize in master controller.
It should be noted that other existing data processors also can be used other than using industrial personal computer in master controller To realize.
Further, the energy-storage battery group is by multiple stored energy capacitances and the limited battery cell of power parameter through controllable Switch connects and the battery network of composition.
Further, the battery management system is configured as:The operation information of each battery cell is acquired, and then online It estimates state-of-charge and health status, and is sent to master controller;
The operating mode instruction that master controller issues is received, controls the on off operating mode of controllable switch to realize that battery network is opened up The adjustment flutterred, to make energy-storage battery group be in different mode, to adapt to different charge and discharge needs.
Wherein, according to the difference of on & off operation mode, there are mainly three types of operating modes for energy-storage battery group:Direct-connected mode, Weighing apparatus mode and idle mode.
(1) under direct-connected mode, all tandem taps closure, paralleling switch is opened, and all batteries are according to after first going here and there and mode Connection, is parallel on DC bus, and battery pack can be with maximum power and external positive energy exchange under the mode.
(2) under balanced mode, round folding is switched in parallel and serial, gradually supplements electricity for the less monomer of electricity, directly It is consistent to all cell-states, maintenance can be adjusted under the mode to battery status, improves battery pack service life And active volume.
(3) under idle mode, all switches are opened, and each battery cell cuts off from battery network and is in stand-by state, The mode is mainly used as intermediate state when pattern switching.
Further, the power regulating system is configured as:The electrical energy form of power grid and the electric energy shape of energy-storage battery group It is converted between formula, while matching network voltage, and control charging voltage and electric current in energy-storage battery group charging process.
In general, battery energy storage system accesses utility network, it is 50Hz AC network (alternative in China Current, AC), and the acceptable electric energy of battery pack is direct current (direct current, DC), therefore power regulation system System needs to complete AC/DC transformation;How much needs that energy-storage system exchanges power with power grid simultaneously are needed according to application and battery pack State is comprehensive to be determined, therefore power regulating system needs to have voltage and current control ability.
Further, the master controller, including:
Monitoring module is configured as receiving battery status and power grid state information and be locally displayed;And
Order calculates and issues module, is configurable to generate power regulating system and energy-storage battery group control instruction, and Corresponding object is handed down to by corresponding communication interface;And
Recording module is configured as the recording process energy storage device course of work.
The second object of the present invention is to provide a kind of work of management system suitable for dynamically reconfigurable battery energy storage system Make method.
The working method of management system suitable for dynamically reconfigurable battery energy storage system of the invention, including:
Stage (1):The energy-storage system state adjusting stage;
After energy-storage system turns back on or exception occurs, whether detection energy-storage system meets preset operating conditions, and It is unsatisfactory for adjust automatically current state when preset operating conditions, until condition meets and enters nominal situation;
Stage (2):Energy-storage battery group active equalization maintenance phase;
When each battery cell remaining capacity difference is more than preset threshold, on the basis of remaining capacities most in battery cell Electricity, the battery cell by switch control to electricity less than benchmark electricity supplement, and are finally reached each battery list of battery pack The consistent shape body of the electricity of body;
Stage (3):The energy-storage system application control stage;
According to energy-storage system concrete application scene and target, energy-storage system charge-discharge electric power is adjusted using respective algorithms, To play the function of energy-storage system adjusting;
Stage (4):The energy-storage system periodic maintenance stage;
The period for needing to be less than preset threshold is adjusted to energy storage in power grid to energy-storage system progress periodic maintenance.
Further, the detailed process of stage (1) the energy-storage system state adjusting stage, including:
Step (1.1):Energy-storage system powers on, and master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (1.2):Judged whether to meet stored energy application condition according to energy-storage battery group state, judgment criteria is energy storage Whether SOC is in the range of setting;If meeting application conditions, energy-storage system control enters energy-storage battery group active equalization and safeguards rank Section, otherwise enters step (1.3);
Step (1.3):Energy-storage battery group is set and enters direct-connected mode, power regulating system ingoing power follow the mode;And All batteries should all be put into, and carry out charge and discharge with the prediction scheme being pre-designed;
Step (1.4):Current SOC and default maximum SOC threshold and default minimum SOC threshold are respectively compared, if currently SOC is less than default minimum SOC threshold, then goes to step (1.5);If current SOC is greater than default maximum SOC threshold, go to step (1.6);
Step (1.5):With the charging of preset power, charge power should take into account adjustment time and charge-discharge magnification, realize two The balance of aspect;
Step (1.6):With preset power discharge, the same step of discharge-rate (1.5);
Step (1.7):Energy-storage battery group state after inquiry adjustment, goes to step (1.1) and continues to judge.
Further, stage (2) the energy-storage battery group active equalization maintenance phase, including:
Step (2.1):Setting power regulating system enters Isobarically Control mode, and energy-storage battery group enters active equalization mould Formula;
Step (2.2):Master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (2.3):Judge whether active equalization is completed, if then entering the energy-storage system application control stage, otherwise, returns To step (2.2);Wherein, judge the condition whether active equalization is completed whether be less than for more each battery cell SOC difference or Equal to preset threshold.
Further, stage (3) the energy-storage system application control stage, including:
Step (3.1):Energy-storage battery group is set and enters direct-connected mode, power regulating system ingoing power follow the mode;
Step (3.2):It calculates energy-storage system according to electric network state and energy-storage system state in conjunction with stored energy application target and fills Discharge power instruction;
Step (3.3):Power computation is sent to power regulating system by communication interface;
Step (3.4):Energy-storage battery group state is inquired, provides basis for energy-storage system periodic maintenance stage charge and discharge control Data;
Step (3.5):Check whether battery state is normal, then enters the energy-storage system periodic maintenance stage if abnormal, The step of (1.2);If normal, then the energy-storage system state adjusting stage is gone to.
Further, stage (4) the energy-storage system periodic maintenance stage, including:
Step (4.1):Judge whether to start active equalization maintenance;
Step (4.2):Setting power regulating system enters Isobarically Control mode, and energy-storage battery group enters active equalization mould Formula;
Step (4.3):Master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (4.4):Judge whether active equalization is completed, if so, the step of into the energy-storage system application control stage (3.1), step (4.3) otherwise, are returned to, it is balanced to continue energy-storage battery group.
Compared with prior art, the beneficial effects of the invention are as follows:
(1) the present invention is directed to make full use of the high control characteristics of dynamically reconfigurable battery pack, a kind of while and power is proposed The energy storage management system of regulating system and batteries management system interaction.The system passes through Collaborative Control battery pack and power regulation The working condition of system promotes battery pack active volume and service life, and then promotes energy-storage system entirety service efficiency, passes through synthesis Battery status information and Power Exchange demand information Optimal Decision-making battery group maintenance state initial time and time realize battery storage It can system maintenance automation.
(2) the battery energy storage systems management such as the achievable Stateful Inspection of the present invention, pattern switching, power tracking, battery maintenance The links of process, and successfully coordinate energy-storage system and driven in the power follow-up capability towards distribution with own monomer otherness Balanced adjustment requirement arrange scheduling on contradiction, for Practical Project have high practical value.
(3) for the energy-storage system constituted based on retired power battery, since retired battery otherness is much larger than new battery And reliability is lower than new battery, energy-storage system management system and its method proposed by the present invention will have application advantage, this will The development for further promoting the resource-conservings, environmentally friendly low-carbon technology such as renewable energy power generation, electric car, pushes warp The simultaneous growth of Ji and social benefit.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the example structure schematic diagram of the management system suitable for dynamically reconfigurable battery energy storage system.
Fig. 2 is power regulating system topological diagram.
Fig. 3 is dynamically reconfigurable battery pack topological diagram.
Fig. 4 is the work flow diagram of the management system suitable for dynamically reconfigurable battery energy storage system.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Term is explained:
PCS:Power conditioning system, power regulating system;
BMS:Battery management system, batteries management system;
SOC:State of charge, state-of-charge;
SOH:State of health, health status.
Fig. 1 gives the example structure schematic diagram of the management system suitable for dynamically reconfigurable battery energy storage system.Such as Shown in Fig. 1, the management system suitable for dynamically reconfigurable battery energy storage system includes energy-storage system main circuit, monitoring circuit and master Controller (such as:Industrial personal computer).
Wherein, energy-storage system is made of energy-storage battery group 2 and coupled power regulating system 1;
Battery management system 4 is respectively connected with energy-storage battery group 2 and master controller;The power regulating system 1 also with Master controller is connected;
The master controller is configured as:According to power grid current state, power grid energy storage demand and the current shape of energy-storage battery group State, Collaborative Control battery management system and power regulating system complete the operating mode and charge-discharge electric power of energy-storage battery group The automation of the maintenance of energy-storage battery group and maintenance is realized in integrated decision-making.
Wherein, electric network state collector 3 can be used to acquire in power grid current state, and electric network state collector 3 acquires in real time Power grid current status data, and it is uploaded to master controller, basic data is provided for the charge and discharge decision of energy-storage battery group.
The acquired electric network state amount of electric network state collector 3 includes but is not limited to:Three-phase voltage, three-phase current, load have Function power, reactive power are exported as input signal with PT, CT of energy storage device infield, are completed using 1kHz frequencies above Data acquisition and digital-to-analogue conversion, and the energy storage device management system run on industrial personal computer is uploaded to by communication channel.Energy storage Management system integrates electric network state data, energy-storage system application target and battery status, adjusts PCS and battery pack work in real time Mode concurrently delivers and changes power instruction.
Specifically, the energy-storage battery group is by multiple stored energy capacitances and the limited battery cell 2-1 of power parameter through can The battery network controlling switch 2-2 connection and constituting, as shown in Figure 3.
The battery management system is configured as:The operation information of each battery cell is acquired, and then estimation on line is charged State and health status, and it is sent to master controller;
The operating mode instruction that master controller issues is received, controls the on off operating mode of controllable switch to realize that battery network is opened up The adjustment flutterred, to make energy-storage battery group be in different mode, to adapt to different charge and discharge needs.
In specific implementation, controllable switch 2-2 can be that the wholly-controled devices such as BJT, MOSFET or IGBT can be used, and from electricity Pond group efficiency and the consideration of cost angle should preferentially use MOSFET.
Wherein, BJT is current mode full-controlled device, and just persistently base current control is open-minded, and base current is 0 and turns off;It opens Close frequency moderate;It is bipolar.
MOSFET is voltage-type full-controlled device;It is open-minded just to continue grid voltage control, the negative grid voltage that continues is controlled and protected Hold shutdown;Switching frequency is high;Monopole.
IGBT is voltage-type full-controlled device;It is open-minded just to continue grid voltage control, the negative grid voltage that continues is controlled and kept Shutdown;Switching frequency is higher;It is bipolar.
Wherein, according to the difference of on & off operation mode, there are mainly three types of operating modes for energy-storage battery group:Direct-connected mode, Weighing apparatus mode and idle mode.
(1) under direct-connected mode, all tandem taps closure, paralleling switch is opened, and all batteries are according to after first going here and there and mode Connection, is parallel on DC bus, and battery pack can be with maximum power and external positive energy exchange under the mode.
(2) under balanced mode, round folding is switched in parallel and serial, gradually supplements electricity for the less monomer of electricity, directly It is consistent to all cell-states, maintenance can be adjusted under the mode to battery status, improves battery pack service life And active volume.
(3) under idle mode, all switches are opened, and each battery cell cuts off from battery network and is in stand-by state, The mode is mainly used as intermediate state when pattern switching.
Specifically, battery management system is executed for the acquisition of battery cell running state data, protection and control instruction. BMS serves as intermediate management interface between battery pack and energy storage management system, it acquires battery cell voltage, electric current, temperature etc. Operation information, and the further integrated informations such as estimation on line SOC and SOH, are uploaded to energy storage management system, while BMS is according to pipe The operating mode instruction that reason system issues controls controllable switch in battery pack and turns on and off, realizes operating mode switching.
Specifically, the power regulating system is configured as:The electrical energy form of power grid and the electrical energy form of energy-storage battery group Between convert, while matching network voltage, and control charging voltage and electric current in energy-storage battery group charging process.
In general, battery energy storage system accesses utility network, it is 50Hz AC network (alternative in China Current, AC), and the acceptable electric energy of battery pack is direct current (direct current, DC), therefore power regulation system System needs to complete AC/DC transformation;How much needs that energy-storage system exchanges power with power grid simultaneously are needed according to application and battery pack State is comprehensive to be determined, therefore power regulating system needs to have voltage and current control ability.Fig. 2 gives the function that the present invention uses Rate regulating system topology, wherein 1-1 is three-phase voltage source type inverter (Voltage source converter, VSC), 1-2 It is buck-boost two-way circuit for buffering capacitor, 1-3, three completes AC/DC transformation, voltage adjustment and electric current and power jointly Control externally provides constant current, the control models interface such as constant pressure, power follow.
Wherein, industrial personal computer 5 can be used to realize in master controller.
Specifically, the master controller, including:
(a) monitoring module is configured as receiving battery status and power grid state information and be locally displayed;
Wherein, need state variable to be shown includes but is not limited to:Battery portion:Battery cell and mould group SOC, electric current, Voltage, temperature, topological structure, charge-discharge electric power etc.;The part PCS:Grid entry point three-phase voltage, is exchanged with power grid three-phase current Reactive power instruction and actual value, active power instruction and actual value;Grid parts:Energy storage installation point parallel branch active power And reactive power, the total active and idle grid-connected power in energy storage attachment point downstream.Monitored variable is showed in the form of time graph, and is pressed Refresh according to setpoint frequency.
(b) order calculates and issues module, is configurable to generate power regulating system and energy-storage battery group control instruction, And corresponding object is handed down to by corresponding communication interface.
Order calculates and issues the difference that module installs purpose according to energy storage device, and power computation module is built-in a variety of suitable Answering property algorithm, with realize renewable power supply power output stabilize, the targets such as peak load shifting.
(c) recording module is configured as the recording process energy storage device course of work.
Recording module place concrete mode is to be controlled according to operation person by selected variable (whole monitored variables or in which one Point) time waveform is stored in hard disk, and provides recording result scan tool, realize recorder data history playback.
It should be noted that other existing data processors also can be used other than using industrial personal computer in master controller To realize.
A kind of management system suitable for dynamically reconfigurable battery energy storage system of the invention, makes full use of battery pack height Controllability feature, improves battery energy storage system utilization efficiency and management automation is horizontal, and energy-storage system is more efficiently and flexible.
The system of purport of the present invention by Collaborative Control battery pack and PCS working condition, promoted battery pack active volume and Service life, and then energy-storage system entirety service efficiency is promoted, optimized by comprehensive battery status information and Power Exchange demand information Decision battery group maintenance state initial time and time realize battery energy storage system maintenance automation.
The target of energy storage device management system proposed by the present invention is coordinated control PCS and battery pack, realizes battery energy storage The efficient operation and automated maintenance of system.Fig. 4 gives the workflow of dynamically reconfigurable battery energy storage apparatus management system, Including 4 Main Stages:
Stage (1):The energy-storage system state adjusting stage;
After energy-storage system turns back on or exception occurs, whether detection energy-storage system meets preset operating conditions, and It is unsatisfactory for adjust automatically current state when preset operating conditions, until condition meets and enters nominal situation.
Specifically, the detailed process of stage (1) the energy-storage system state adjusting stage, including:
Step (1.1):Energy-storage system powers on, and master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (1.2):Judged whether to meet stored energy application condition according to energy-storage battery group state, judgment criteria is energy storage Whether SOC is in the range (usually 0.15~0.85) of setting;If meeting application conditions, energy-storage system control enters energy storage electricity Pond group active equalization maintenance phase, otherwise enters step (1.3);
In step (1.2), to avoid pattern switching from vibrating, it should realize that SOC compares using software hysteresis;
Step (1.3):Energy-storage battery group is set and enters direct-connected mode, power regulating system ingoing power follow the mode;And All batteries should all be put into, and carry out charge and discharge with the prediction scheme being pre-designed;
Wherein, it when battery capacity is unsatisfactory for requiring, needs to adjust electricity;
Step (1.4):Current SOC and default maximum SOC threshold and default minimum SOC threshold are respectively compared, if currently SOC is less than default minimum SOC threshold, then goes to step (1.5);If current SOC is greater than default maximum SOC threshold, go to step (1.6);
Step (1.5):With the charging of preset power, charge power should take into account adjustment time and charge-discharge magnification (usually may be used 1/3C charge and discharge are set), realize both sides balance;
Step (1.6):With preset power discharge, the same step of discharge-rate (1.5);
Step (1.7):Energy-storage battery group state after inquiry adjustment, goes to step (1.1) and continues to judge.
Stage (2):Energy-storage battery group active equalization maintenance phase;
After pond energy-storage system places investment again or multiple charge and discharge for a long time, since self-discharge rate and other parameters exist Difference, each monomer remaining capacity may be dramatically different, reduce battery pack active volume, this stage passes through reasonable switch control pair The few monomer of electricity is supplemented, and the consistent shape body of each monomer electricity of battery pack is finally reached.
Specifically, when each battery cell remaining capacity difference is more than preset threshold, with electricity at most remaining in battery cell Amount is benchmark electricity, and the battery cell by switch control to electricity less than benchmark electricity supplements, and is finally reached battery pack The consistent shape body of the electricity of each battery cell.
In specific implementation, stage (2) the energy-storage battery group active equalization maintenance phase, including:
Step (2.1):Setting power regulating system enters Isobarically Control mode, and energy-storage battery group enters active equalization mould Formula;
Wherein, internal DC/DC circuit work is that short of electricity monomer charges, thus needs external steady during active equalization of battery Constant voltage, therefore first setting PCS works in constant voltage mode, maintains DC bus-bar voltage constant, then controls battery and enters actively Weighing apparatus mode;
Step (2.2):Master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (2.3):Judge whether active equalization is completed, if then entering the energy-storage system application control stage, otherwise, returns To step (2.2);Wherein, judge the condition whether active equalization is completed whether be less than for more each battery cell SOC difference or Equal to preset threshold.
Stage (3):The energy-storage system application control stage;
According to energy-storage system concrete application scene and target (such as peak load shifting, renewable energy go out fluctuation and stabilize), adopt Energy-storage system charge-discharge electric power is adjusted, with respective algorithms to play the function of energy-storage system adjusting.
In specific implementation, stage (3) the energy-storage system application control stage, including:
Step (3.1):Energy-storage battery group is set and enters direct-connected mode, power regulating system ingoing power follow the mode;
Step (3.2):It calculates energy-storage system according to electric network state and energy-storage system state in conjunction with stored energy application target and fills Discharge power instruction;
Step (3.3):Power computation is sent to power regulating system by communication interface;
Step (3.4):Energy-storage battery group state is inquired, provides basis for energy-storage system periodic maintenance stage charge and discharge control Data;
Step (3.5):Check whether battery state is normal, then enters the energy-storage system periodic maintenance stage if abnormal, The step of (1.2);If normal, then the energy-storage system state adjusting stage is gone to.
Battery shape has been included in charge-discharge electric power instruction calculating in the step of due to the energy-storage system periodic maintenance stage (1.2) State, therefore in most cases, this step testing result will not be abnormal.This step is arranged mainly as a kind of salvo.
Stage (4):The energy-storage system periodic maintenance stage;
The period for needing to be less than preset threshold is adjusted to energy storage in power grid to energy-storage system progress periodic maintenance.
Subsequent electric discharge is once full of with electric automobile power battery, operation in cycles is different, be applied to power grid (such as Renewable energy goes out fluctuation and stabilizes) energy-storage system charging-discharging cycle, frequency, depth etc. is related with application demand and becomes It is more complicated.Occurs abnormal number in (3) stage normal use to reduce energy-storage system, the design phase (4) is periodically right Battery pack is safeguarded.The stage, which is usually adjusted energy storage in power grid, needs the lesser period to carry out, for example is stabilized using energy storage When photovoltaic goes out fluctuation, active maintenance can be timed to battery when photovoltaic is not contributed at dead of night.
Specifically, stage (4) the energy-storage system periodic maintenance stage, including:
Step (4.1):Judge whether to start active equalization maintenance;
Usual connected applications scene feature, daily or weekly periodic maintenance, therefore be herein really to compare the time;
Step (4.2):Setting power regulating system enters Isobarically Control mode, and energy-storage battery group enters active equalization mould Formula;
Step (4.3):Master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (4.4):Judge whether active equalization is completed, if so, the step of into the energy-storage system application control stage (3.1), step (4.3) otherwise, are returned to, it is balanced to continue energy-storage battery group.
The battery energy storage systems management processes such as the achievable Stateful Inspection of the present invention, pattern switching, power tracking, battery maintenance Links, and successfully coordinate energy-storage system drive in the power follow-up capability towards distribution with own monomer otherness it is equal The adjustment requirement that weighs is arranging the contradiction in scheduling, has high practical value for Practical Project.
For the energy-storage system constituted based on retired power battery, since retired battery otherness can much larger than new battery It is lower than new battery again by property, energy-storage system management system and its method proposed by the present invention there will be application advantage, this will be into one Step promotes the development of renewable energy power generation, the resource-conservings, environmentally friendly low-carbon technology such as electric car, push it is economical with The simultaneous growth of social benefit.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.

Claims (10)

1. a kind of management system suitable for dynamically reconfigurable battery energy storage system, which is characterized in that including by energy-storage battery group And the energy-storage system that coupled power regulating system is constituted;And
Battery management system is respectively connected with energy-storage battery group and master controller;The power regulating system also with main control Device is connected;
The master controller is configured as:According to power grid current state, power grid energy storage demand and energy-storage battery group current state, association Synthesis with control battery management system and power regulating system, the operating mode and charge-discharge electric power of completing energy-storage battery group is determined Plan realizes the automation of the maintenance of energy-storage battery group and maintenance.
2. a kind of management system suitable for dynamically reconfigurable battery energy storage system as described in claim 1, which is characterized in that The energy-storage battery group is to be connected with the limited battery cell of power parameter by multiple stored energy capacitances and constituted through controllable switch Battery network.
3. a kind of management system suitable for dynamically reconfigurable battery energy storage system as claimed in claim 2, which is characterized in that The battery management system is configured as:Acquire the operation information of each battery cell, and then estimation on line state-of-charge and strong Health state, and it is sent to master controller;
The operating mode instruction that master controller issues is received, controls the on off operating mode of controllable switch to realize battery network topology Adjustment, to make energy-storage battery group be in different mode, to adapt to different charge and discharge needs.
4. a kind of management system suitable for dynamically reconfigurable battery energy storage system as described in claim 1, which is characterized in that The power regulating system is configured as:It converts between the electrical energy form of power grid and the electrical energy form of energy-storage battery group, matches simultaneously Network voltage, and control charging voltage and electric current in energy-storage battery group charging process.
5. a kind of management system suitable for dynamically reconfigurable battery energy storage system as described in claim 1, which is characterized in that The master controller, including:
Monitoring module is configured as receiving battery status and power grid state information and be locally displayed;And
Order calculates and issues module, is configurable to generate power regulating system and energy-storage battery group control instruction, and pass through Corresponding communication interface is handed down to corresponding object;And
Recording module is configured as the recording process energy storage device course of work.
6. a kind of management system according to any one of claims 1 to 5 suitable for dynamically reconfigurable battery energy storage system Working method, which is characterized in that including:
Stage (1):The energy-storage system state adjusting stage;
After energy-storage system turns back on or exception occurs, whether detection energy-storage system meets preset operating conditions, and discontented Adjust automatically current state when sufficient preset operating conditions, until condition meets and enters nominal situation;
Stage (2):Energy-storage battery group active equalization maintenance phase;
It is electric on the basis of remaining capacities most in battery cell when each battery cell remaining capacity difference is more than preset threshold Amount, the battery cell by switch control to electricity less than benchmark electricity supplement, and are finally reached each battery cell of battery pack The consistent shape body of electricity;
Stage (3):The energy-storage system application control stage;
According to energy-storage system concrete application scene and target, energy-storage system charge-discharge electric power is adjusted using respective algorithms, with hair Wave the function of energy-storage system adjusting;
Stage (4):The energy-storage system periodic maintenance stage;
The period for needing to be less than preset threshold is adjusted to energy storage in power grid to energy-storage system progress periodic maintenance.
7. the working method suitable for the management system of dynamically reconfigurable battery energy storage system as claimed in claim 6, special Sign is, the detailed process of stage (1) the energy-storage system state adjusting stage, including:
Step (1.1):Energy-storage system powers on, and master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (1.2):Judged whether to meet stored energy application condition according to energy-storage battery group state, judgment criteria is energy storage SOC Whether in the range of setting;If meeting application conditions, energy-storage system control enters energy-storage battery group active equalization maintenance phase, Otherwise (1.3) are entered step;
Step (1.3):Energy-storage battery group is set and enters direct-connected mode, power regulating system ingoing power follow the mode;And it is all Battery should all be put into, and carry out charge and discharge with the prediction scheme being pre-designed;
Step (1.4):Current SOC and default maximum SOC threshold and default minimum SOC threshold are respectively compared, if current SOC is small In default minimum SOC threshold, then (1.5) are gone to step;If current SOC is greater than default maximum SOC threshold, (1.6) are gone to step;
Step (1.5):With the charging of preset power, charge power should take into account adjustment time and charge-discharge magnification, realize two aspects Balance;
Step (1.6):With preset power discharge, the same step of discharge-rate (1.5);
Step (1.7):Energy-storage battery group state after inquiry adjustment, goes to step (1.1) and continues to judge.
8. the working method suitable for the management system of dynamically reconfigurable battery energy storage system as claimed in claim 6, special Sign is, stage (2) the energy-storage battery group active equalization maintenance phase, including:
Step (2.1):Setting power regulating system enters Isobarically Control mode, and energy-storage battery group enters active equalization mode;
Step (2.2):Master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (2.3):Judge whether active equalization is completed, if otherwise then entering the energy-storage system application control stage returns to step Suddenly (2.2);Wherein, judge whether the condition whether active equalization is completed is less than or equal to for more each battery cell SOC difference Preset threshold.
9. the working method suitable for the management system of dynamically reconfigurable battery energy storage system as claimed in claim 6, special Sign is, stage (3) the energy-storage system application control stage, including:
Step (3.1):Energy-storage battery group is set and enters direct-connected mode, power regulating system ingoing power follow the mode;
Step (3.2):Energy-storage system charge and discharge are calculated according to electric network state and energy-storage system state in conjunction with stored energy application target Power instruction;
Step (3.3):Power computation is sent to power regulating system by communication interface;
Step (3.4):Energy-storage battery group state is inquired, provides basic number for energy-storage system periodic maintenance stage charge and discharge control According to;
Step (3.5):Check whether battery state is normal, then enters the step in energy-storage system periodic maintenance stage if abnormal, Suddenly (1.2);If normal, then the energy-storage system state adjusting stage is gone to.
10. the working method suitable for the management system of dynamically reconfigurable battery energy storage system as claimed in claim 6, special Sign is, stage (4) the energy-storage system periodic maintenance stage, including:
Step (4.1):Judge whether to start active equalization maintenance;
Step (4.2):Setting power regulating system enters Isobarically Control mode, and energy-storage battery group enters active equalization mode;
Step (4.3):Master controller is communicated with battery management system, inquires energy-storage battery group state;
Step (4.4):Judge whether active equalization is completed, if so, the step of into the energy-storage system application control stage (3.1), step (4.3) otherwise, are returned to, it is balanced to continue energy-storage battery group.
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