CN103606943A - Microgrid nickel-metal hydride battery energy storage system - Google Patents
Microgrid nickel-metal hydride battery energy storage system Download PDFInfo
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- CN103606943A CN103606943A CN201310635057.4A CN201310635057A CN103606943A CN 103606943 A CN103606943 A CN 103606943A CN 201310635057 A CN201310635057 A CN 201310635057A CN 103606943 A CN103606943 A CN 103606943A
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- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention provides a microgrid nickel-metal hydride battery energy storage system. A plurality of nickel-metal hydride battery cupboards which are electrically connected in parallel, a parallel connection control cabinet, an energy conversion system, an alternating-current distribution cabinet and the mains supply are electrically connected in sequence in a bidirectional mode. The alternating-current distribution cabinet is further electrically connected with an electrical load side in a unidirectional mode and also electrically connected with a charging / discharging machine in a bidirectional mode. A battery management system is connected with an energy management system, the nickel-metal hydride battery cupboards, the parallel connection control cabinet, the energy conversion system and the charging / discharging machine in a bidirectional mode. The alternating-current terminal of the energy conversion system is connected with the mains supply through the alternating-current distribution cabinet. According to the microgrid nickel-metal hydride battery energy storage system, large-scale parallel connection of the battery cupboards can be realized by means of coordinated management and control of the parallel connection control cabinet and the battery management system, and the safety and reliability problems that a single battery is low in capacity and is difficult to apply in a large-scale parallel connection mode, maintain in an equalized mode, and utilize with high efficiency are well solved.
Description
Technical field
The present invention relates to a kind of architectural microgrid Ni-MH battery energy storage systems such as city building, garden, community that are mainly used in.
Background technology
Urban economy development has caused a series of social concern, and as population growth, energy crisis, environmental pollution, natural calamity etc., wherein electricity consumption shortage in city is particularly serious.
City electrical problem concrete manifestation is in the following areas: city shortage of electric power, have a power failure on a large scale and short of electricity, and carbon emission high; Planned power consumption are not mated with generating, and the power load period is inhomogeneous, causes imbalance between supply and demand and the wasting of resources; The application percentage of new forms of energy is low, and for example the networking ratio of wind energy, solar energy is low, and that electrical network is dissolved is lower, and the waste of new forms of energy is serious.
Traditional solution is not still broken away from traditional production of energy and utilizes mode as construction thermal power station, Pumped Storage Power Station Construction, intercity electric power dispensing mode, can not tackle the problem at its root.
Greatly develop the micro-grid system based on user's side, improve the utilance of regenerative resource and new forms of energy, promote the utilization ratio of the energy, reduce carbon emission, become just gradually common recognition.Micro-grid system is to take integrated 3S(BMS+PCS+EMS) technology is core, by distributed new electricity generation system, distributed energy storage platform, load energy conserving system, energy management system collect small-sized of forming, join, storage, defeated, the electric power system sent, both can be incorporated into the power networks with external electrical network, also can isolated operation.
Battery energy storage system is as the important component part of distributed energy storage platform, play the contradiction between efficient allotment power supply and electricity consumption, stored energy and release by battery energy storage system realize the energy equilibrium of supply and demand and microgrid power-balance, the defect that can effectively solve intermittence, the unsteadiness of distributed power generation, low reliability, low-security is the key subsystem of micro-grid system.But also there is high expensive in battery energy storage system, need a large amount of batteries to carry out connection in series-parallel to realize scale stored energy and releasability, need to carry out comparatively complicated management and equilibrium, to improve fail safe, the reliability of battery energy storage system.
Adopt high power capacity cell to reduce the connection in series-parallel quantity of the cell of battery energy storage system battery, but the manufacture of cell high capacity is a large problem, the consistency between monomer whose battery is often poor; Adopt bi-directional DC-DC, solve cell is indirectly connected in parallel after series connection forms high-voltage battery string again, but the introducing of bi-directional DC-DC, reduced the efficiency of battery energy storage system, and there is a difficult problem for current-sharing and control in the parallel connection between bi-directional DC-DC equally; Employing BMS(battery management system) in, balanced management module is set, battery energy storage system is carried out to equalizing charge or electric discharge management, to maintain the relative uniformity between cell, to guarantee that battery energy storage system can provide the function of stored energy and release, but this mode is often brought high, the balanced inefficient problem of balanced management cost.
Summary of the invention
The present invention is intended to overcome the above-mentioned defect that prior art exists, and provides a kind of parallel connection simple in groups, and balanced management is simply effective, the microgrid Ni-MH battery energy storage system that input cost is low.The present invention realizes by following scheme.
A microgrid Ni-MH battery energy storage system, a plurality of Ni-MH battery cabinet, Parallel Control cabinet, energy conversion system, AC power distribution cabinet/AC distribution panel, civil power two-way electrical connections successively that are electrically connected in parallel; AC power distribution cabinet/AC distribution panel is also connected with power load end unidirectional electrical, is also electrically connected to charge/discharge machine is two-way; Battery management system one end is connected with EMS is two-way, the other end respectively with Ni-MH battery cabinet, Parallel Control cabinet, energy conversion system, charge/discharge machine is two-way is connected; Described EMS respectively with energy conversion system, charge/discharge machine is two-way is connected; Described energy conversion system, it exchanges end and is connected with civil power by AC power distribution cabinet/AC distribution panel.
Between a plurality of Ni-MH battery cabinets, by Parallel Control cabinet, carry out parallel connection and be electrically connected to, described Ni-MH battery cabinet comprises a plurality of battery tray, cabinet, stube cable, and described battery tray comprises a plurality of power brick.
AC power distribution cabinet/AC distribution panel, main realization provides alternating current, relaying protection, data metering.
Described energy conversion system is called again PCS, it is a kind of bi-directional electric power electronic inverter, thereby direct current can be converted to alternating current and send into AC network realization to battery energy storage system electric discharge, also alternating current can be converted to direct current and charge to battery energy storage system.
Described charge/discharge machine, also be a kind of convertor assembly, power ratio PCS is much smaller, thereby direct current can be converted to alternating current, sends into AC network realization to battery energy storage system electric discharge, also alternating current can be converted to direct current and charge to battery energy storage system.Charge/discharge machine is electrically connected to Ni-MH battery cabinet is two-way, on the connecting circuit of Ni-MH battery cabinet positive terminal and charge/discharge machine positive terminal, be provided with fuse, on the connecting circuit of Ni-MH battery cabinet negative pole end and charge/discharge machine negative pole end, be provided with can accept intelligent switch that remote information controls as direct current relay or D.C. contactor or IGBT be bipolar insulated gate electrode transistor npn npn.
Described Parallel Control cabinet comprise a plurality of unilateral diodes, a plurality of accept intelligent switch that remote information controls as direct current relay or D.C. contactor or IGBT be bipolar insulated gate electrode transistor npn npn, a plurality of fuse FUSE, mainly realize the in parallel of battery rack or disconnect in parallel.Unilateral diode is connected with fuse with after intelligent switch parallel connection, is then connected to the positive terminal of battery rack, forms circuit; After unilateral diode is in parallel with intelligent switch, be connected to the negative pole end of battery rack, form circuit.
Described battery management system BMS, the information such as the voltage of main monitoring battery, electric current, temperature, electriferous state SOC, health status SOH, on off state, these information are fed back to EMS EMS, accept the instruction of EMS EMS, corresponding intelligent switch in conducting or disconnection Parallel Control cabinet, collaborative energy conversion system PCS carries out charge or discharge work; Or conducting or disconnect the intelligent switch of the dynamo-electric circuit of charge/discharge, collaborative charge/discharge machine carries out charge or discharge work, realizes the equalized maintenance to specific Ni-MH battery cabinet.
A kind of microgrid Ni-MH battery energy storage system, there is the function of moving under can a kind of pattern in charged in parallel pattern, parallel discharge pattern, standby mode in parallel, equalized maintenance pattern, or there is the function of moving under can a kind of pattern in the arbitrarily coupling of equalized maintenance pattern and charged in parallel pattern, parallel discharge pattern, three kinds of patterns of standby mode in parallel.
Charged in parallel mode operation while meeting the following conditions: (1) battery management system receives the command request that EMS requires to enter charge mode, (2) Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality etc., battery management system inerrancy and warning message, there are not the abnormal conditions that do not meet charge function requirement in (3) energy conversion system inerrancy and warning message.
Parallel discharge mode operation while meeting the following conditions: (1) battery management system receives the command request that EMS requires to enter discharge mode, (2) Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality etc., battery management system inerrancy and warning message, there are not the abnormal conditions that do not meet discharging function requirement in (3) energy conversion system inerrancy and warning message.
Standby mode operation in parallel while meeting the following conditions: (1) battery management system receives the command request that EMS requires to enter standby mode, (2) Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality etc., or Ni-MH battery cabinet is (as electriferous state SOC is 100% or has reached the normal cut-off condition of charging) or emptying state (as electriferous state SOC is 0% or has reached the normal cut-off condition of electric discharge) in being full of, battery management system inerrancy and warning message.
Equalized maintenance mode operation while meeting the following conditions: the difference between (1) excessive certain Ni-MH battery cabinet electriferous state SOC value of certain Ni-MH battery cabinet electriferous state SOC deviation and a plurality of Ni-MH battery cabinet electriferous state SOC mean value reaches more than 15%; Or certain Ni-MH battery cabinet voltage deviation is excessive is more than cell minimum voltage Vmin reaches 40*n mv with difference between cell maximum voltage Vmax when Ni-MH battery cabinet electriferous state SOC value is 15% in certain Ni-MH battery cabinet, and wherein n is the quantity of the interior cell of described certain Ni-MH battery cabinet; Or certain Ni-MH battery cabinet memory effect is excessive is the Ni-MH battery cabinet electriferous state SOC value of certain Ni-MH battery cabinet when reaching 1200*n mv with a certain equal multiplying power discharging to cell average voltage, the difference of Ni-MH battery cabinet electriferous state SOC value when reaching 1200*n mv with identical multiplying power discharging to cell average voltage for the first time after finishing with last equilibrium reaches more than 15%, and wherein n is the quantity of cell in described certain Ni-MH battery cabinet; Or certain Ni-MH battery cabinet current deviation is excessive is to meet between the charge or discharge electric current I of certain Ni-MH battery cabinet and a plurality of Ni-MH battery cabinet average current Iave: the absolute value of (I-Iave)/Iave is greater than 50%; (2) there are not the abnormal conditions that do not meet charge or discharge functional requirement in the inerrancy of charge/discharge machine and warning message.
While meeting the following conditions, equalized maintenance pattern is moved with the coupled mode of charged in parallel pattern, parallel discharge pattern, any one coupling of standby mode in parallel, a kind of pattern of (1) microgrid Ni-MH battery energy storage system in standby mode in parallel, charged in parallel pattern, parallel discharge pattern; (2) certain Ni-MH battery cabinet electriferous state SOC deviation is excessive is that difference between certain Ni-MH battery cabinet electriferous state SOC value and a plurality of Ni-MH battery cabinet SOC mean value reaches more than 15%; Or certain Ni-MH battery cabinet voltage deviation is excessive is more than cell minimum voltage Vmin reaches 40*n mv with difference between cell maximum voltage Vmax when Ni-MH battery cabinet electriferous state SOC is 15% in certain Ni-MH battery cabinet, and wherein n is the quantity of the interior cell of described certain Ni-MH battery cabinet; Or certain Ni-MH battery cabinet current deviation is excessive is to meet between certain Ni-MH battery cabinet charge or discharge electric current I and a plurality of Ni-MH battery cabinet average current Iave: the absolute value of (I-Iave)/Iave is greater than 50%.
The running of microgrid Ni-MH battery energy storage system of the present invention is as follows:
When EMS EMS receives the normal information of battery management system BMS state, EMS EMS sends standby command to battery management system BMS, battery management system BMS sends the instruction of conducting intelligent switch to Parallel Control cabinet afterwards, intelligent switch conducting, each Ni-MH battery cabinet is realized conducting successively, form parallel connection, now microgrid Ni-MH battery energy storage system is in standby mode in parallel.
When EMS EMS receives energy conversion system PCS state normal information, control strategy requirement according to charging and discharging, EMS EMS has formed the control command of charging, and charging instruction is issued to battery management system BMS and energy conversion system PCS, if microgrid Ni-MH battery energy storage system is not now in standby mode in parallel, first carry out standby mode dependent instruction action in parallel, realize the parallel connection of each Ni-MH battery cabinet, if microgrid Ni-MH battery energy storage system is in standby mode in parallel, by energy conversion system PCS, alternating current being converted to direct current charges to Ni-MH battery cabinet, now microgrid Ni-MH battery energy storage system is in charged in parallel pattern.When each Ni-MH battery cabinet is in being full of (as electriferous state SOC is 100% or has reached the normal cut-off condition of charging), the charge power of energy conversion system PCS reduces to zero, stop each Ni-MH battery cabinet charging, now microgrid Ni-MH battery energy storage system returns to standby mode in parallel.
When EMS EMS receives energy conversion system PCS state normal information, control strategy requirement according to charging and discharging, EMS EMS has formed the control command of electric discharge, EMS EMS will discharge instruction issuing to battery management system BMS and energy conversion system PCS, if microgrid Ni-MH battery energy storage system is not now in standby mode in parallel, first carry out standby mode dependent instruction action in parallel, realize the parallel connection of each Ni-MH battery cabinet, if microgrid Ni-MH battery energy storage system is in standby mode in parallel, by energy conversion system PCS direct current, being converted to alternating current discharges to Ni-MH battery cabinet, now microgrid Ni-MH battery energy storage system is in parallel discharge pattern.When each Ni-MH battery cabinet is in emptying state (as electriferous state SOC is 0% or has reached the normal cut-off condition of electric discharge), energy conversion system PCS discharge power reduces to zero, stop each Ni-MH battery cabinet electric discharge, now microgrid Ni-MH battery energy storage system returns to standby mode in parallel.
When certain Ni-MH battery cabinet has occurred that electriferous state SOC deviation is excessive or voltage deviation is excessive or current deviation is excessive or memory effect is excessive, EMS EMS first confirms that the inerrancy of charging/generator and warning message do not exist the abnormal conditions that do not meet charge or discharge functional requirement, then EMS EMS sends this Ni-MH battery cabinet equalized maintenance work order to battery management system BMS, battery management system BMS issues by instruction the intelligent switch that Parallel Control cabinet disconnects this Ni-MH battery cabinet in parallel, battery management system BMS receives after the information of Parallel Control cabinet disconnection intelligent switch, send turn-on command to charge/discharge machine, EMS EMS receives the intelligent switch of the disconnection Parallel Control cabinet that battery management system BMS passes back, after the information of conducting charge/discharge machine, EMS EMS sends charge or discharge power instruction to charge/discharge machine, charge/discharge machine carries out inversion work, this Ni-MH battery cabinet is carried out to charge or discharge operation, microgrid Ni-MH battery energy storage system enters equalized maintenance pattern.
When microgrid Ni-MH battery energy storage system is in standby mode in parallel, charged in parallel pattern, a kind of pattern in parallel discharge pattern, when certain Ni-MH battery cabinet has occurred that electriferous state SOC deviation is excessive or voltage deviation is excessive or current deviation is excessive, battery management system BMS sends open command in parallel to Parallel Control cabinet, first the intelligent switch of that Ni-MH battery cabinet of electriferous state deviation or voltage deviation or current deviation maximum is disconnected, cut off the in parallel of this Ni-MH battery cabinet and other Ni-MH battery cabinet, this Ni-MH battery cabinet information gathers via battery management system BMS, and be sent to EMS EMS, by EMS EMS, according to the balance policy of prior setting, carry out decision-making, enter into corresponding equalized maintenance pattern, now microgrid Ni-MH battery energy storage system is just in equalized maintenance pattern and charged in parallel pattern, parallel discharge pattern, the coupled mode of any one coupling of standby mode in parallel.
Compared with prior art, microgrid Ni-MH battery energy storage system of the present invention, has following characteristics and advantage:
1, be conducive to the scale expansion of microgrid Ni-MH battery energy storage system.The present invention, with lower cost, preferably resolves in microgrid Ni-MH battery energy storage system scale process, need carry out the problem of a large amount of Parallel Control.By the setting of Parallel Control cabinet, both realized function in parallel, again can the fail safe of effective guarantee battery and the reliability of system.
2, be conducive to the efficient equilibrium of microgrid Ni-MH battery energy storage system and efficiently utilize.The independently setting of charge/discharge machine and equalizing circuit, can substantially not affect under the prerequisite of microgrid Ni-MH battery energy storage system overall operation work, equalized maintenance processing is carried out in the part of Ni-MH battery energy storage system, there is very high flexibility, effectively overcome Ni-MH battery memory effect, shortcoming that capacity is on the low side.
3, be conducive to the fail safe of microgrid Ni-MH battery energy storage system.The setting of Parallel Control cabinet and independent balancing equipment and circuit, and system works pattern and tactful setting, can better avoid the deterioration of Ni-MH battery energy storage system performance, solve the phenomenons such as current deviation is large, voltage deviation is large, make system all the time in a reliable and metastable state, greatly promoted the fail safe of microgrid Ni-MH battery energy storage system.
Accompanying drawing explanation
Microgrid Ni-MH battery energy storage system structural representation in Fig. 1 embodiment 1
The structural representation of battery rack in Fig. 2 embodiment 1
The structural representation of battery tray in Fig. 3 embodiment 1
The fundamental diagram of microgrid Ni-MH battery energy storage system in Fig. 4 embodiment 1
Embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited to the statement of embodiment.
A microgrid Ni-MH battery energy storage system, as shown in Figure 1, L Ni-MH battery cabinet, Parallel Control cabinet, energy conversion system, AC power distribution cabinet/AC distribution panel, the civil power two-way electrical connection being successively electrically connected in parallel; AC power distribution cabinet/AC distribution panel is also connected with power load end unidirectional electrical, is also electrically connected to charge/discharge machine is two-way; Charge/discharge machine is electrically connected to Ni-MH battery cabinet is two-way; Battery management system employing TCP/IP realizes two-way communication with EMS and is connected, battery management system employing RS485 realizes two-way communication with Parallel Control cabinet, energy conversion system, charge/discharge machine respectively and is connected, and battery management system employing CAN2.0B realizes two-way communication with Ni-MH battery cabinet and is connected; EMS employing RS485 realizes two-way communication with energy conversion system, charge/discharge machine respectively and is connected; Energy conversion system, it exchanges end and is connected with civil power by AC power distribution cabinet/AC distribution panel.
Between L Ni-MH battery cabinet, by Parallel Control cabinet, carrying out parallel connection is electrically connected to.As shown in Figure 2, Ni-MH battery cabinet comprises M the battery tray of series connection mutually; As shown in Figure 3, battery tray comprises N the power brick of series connection mutually; Wherein L, M, N are natural number.
As shown in Figure 4, the positive terminal of charge/discharge machine is electrically connected to and is provided with on connecting circuit fuse with the positive terminal of Ni-MH battery cabinet, the negative pole end of charge/discharge machine and the negative pole end of Ni-MH battery cabinet be electrically connected to and be provided with on connecting circuit can accept intelligent switch that remote information controls as direct current relay or D.C. contactor or IGBT be bipolar insulated gate electrode transistor npn npn.
Parallel Control cabinet, comprises m unilateral diode D, a m intelligent switch K and m/2 fuse FUSE as shown in Figure 4, and wherein m is 2 times of battery rack quantity L.Unilateral diode D with after intelligent switch K parallel connection, connect with a fuse FUSE, be then connected to the positive terminal of battery rack, form the direct-flow positive pole end A that m/2 bar circuit access in parallel energy conversion system PCS provides; After a unilateral diode D is in parallel with an intelligent switch K, be connected to the negative pole end of battery rack, form the direct current negative pole end B that m/2 bar circuit access in parallel energy conversion system PCS provides.
Microgrid Ni-MH battery energy storage system, there is the function of moving under can a kind of pattern in charged in parallel pattern, parallel discharge pattern, standby mode in parallel, equalized maintenance pattern, or there is the function of moving under can a kind of pattern in the arbitrarily coupling of equalized maintenance pattern and charged in parallel pattern, parallel discharge pattern, three kinds of patterns of standby mode in parallel.
The running of the microgrid Ni-MH battery energy storage system in the present embodiment is as follows:
After the energising of microgrid Ni-MH battery energy storage system, EMS EMS monitors the information that battery management system BMS uploads, confirm that Ni-MH battery cabinet is without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality etc., battery management system BMS inerrancy and warning message, EMS EMS sends and enters standby mode work order in parallel to battery management system BMS, battery management system BMS receives after EMS EMS instruction, battery management system BMS sends parallel operation instruction to Parallel Control cabinet, owing to not having the Ni-MH battery cabinet that need to carry out equalized maintenance, so intelligent switch K1 in all Parallel Control cabinets, K2, K3, K4, ., Km-1, Km receives closure signal instruction, successively carry out closed action, realize the parallel connection of all Ni-MH battery cabinets, microgrid Ni-MH battery energy storage system is in standby mode in parallel.
The decision logic that EMS EMS arranges according to inside, the instruction that generating nickel hydrogen battery cabinet need to charge, confirm Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality etc., battery management system BMS inerrancy and warning message, confirm that energy conversion system PCS inerrancy and warning message do not exist the abnormal conditions that do not meet charge function requirement.EMS EMS sends and enters the instruction of charged in parallel work pattern to battery management system BMS, battery management system BMS receives after EMS EMS instruction, by the intelligent switch K1 in Parallel Control cabinet, K2, K3, K4, ., Km-1, Km current state feeds back to EMS EMS, if intelligent switch K1, K2, K3, K4, ., Km-1, Km is closure state, show that microgrid Ni-MH battery energy storage system is in standby mode in parallel, if intelligent switch K1, K2, K3, K4, ., Km-1, Km is off-state, the work order that battery management system BMS carries out standby mode in parallel makes intelligent switch K1, K2, K3, K4, ., Km-1, Km carries out closed action and reaches closure state.EMS EMS confirms that battery management system BMS is after standby mode in parallel, EMS EMS sends charge power instruction to energy conversion system PCS, energy conversion system PCS carries out charge power output, alternating current is converted to direct current to the charging of Ni-MH battery cabinet, and microgrid Ni-MH battery energy storage system carries out charged in parallel pattern.
When Ni-MH battery cabinet is in being full of (as electriferous state SOC is 100% or has reached the normal cut-off condition of charging), the charge power of energy conversion system PCS reduces to zero, stop the charging of Ni-MH battery cabinet, now microgrid Ni-MH battery energy storage system returns to standby mode in parallel.
The decision logic that EMS EMS arranges according to inside, the instruction that generating nickel hydrogen battery cabinet need to discharge, confirm Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality etc., battery management system BMS inerrancy and warning message, confirm that energy conversion system PCS inerrancy and warning message do not exist the abnormal conditions that do not meet charge function requirement.EMS EMS sends and enters the instruction of parallel discharge work pattern to battery management system BMS, battery management system BMS receives after EMS EMS instruction, by the intelligent switch K1 in Parallel Control cabinet, K2, K3, K4, ., Km-1, Km current state feeds back to EMS EMS, if intelligent switch K1, K2, K3, K4, ., Km-1, Km is closure state, show that microgrid Ni-MH battery energy storage system is in standby mode in parallel, if intelligent switch K1, K2, K3, K4, ., Km-1, Km is off-state, the work order that battery management system BMS carries out standby mode in parallel makes intelligent switch K1, K2, K3, K4, ., Km-1, Km carries out closed action and reaches closure state.EMS EMS confirms that battery management system BMS is after standby mode in parallel, EMS EMS sends discharge power instruction to energy conversion system PCS, energy conversion system PCS carries out discharge power output, carry out electric energy inversion, microgrid Ni-MH battery energy storage system carries out parallel discharge pattern.
When Ni-MH battery cabinet is in emptying state (as electriferous state SOC is 0% or has reached the normal cut-off condition of electric discharge), energy conversion system PCS discharge power reduces to zero, stop the electric discharge to Ni-MH battery cabinet, now microgrid Ni-MH battery energy storage system returns to standby mode in parallel.
When Ni-MH battery cabinet 1 occurs: the difference between (1) Ni-MH battery cabinet 1 electriferous state SOC value and L Ni-MH battery cabinet electriferous state SOC mean value reaches more than 15%, or (2), more than the difference between Ni-MH battery cabinet 1 interior cell minimum voltage Vmin and cell maximum voltage Vmax reaches 40*n mv when Ni-MH battery cabinet 1 electriferous state SOC value is 15%, wherein n is the quantity of described Ni-MH battery cabinet 1 interior cell, or the 1 electriferous state SOC value of Ni-MH battery cabinet when (3) Ni-MH battery cabinet 1 reaches 1200*n mv with 1C multiplying power discharging to cell average voltage, the difference of Ni-MH battery cabinet 1 electriferous state SOC value when reaching 1200*n mv with 1C multiplying power discharging to cell average voltage for the first time after last balanced end reaches more than 15%, and wherein n is the quantity of Ni-MH battery cabinet 1 interior cell, or (4) between the charge or discharge electric current I of Ni-MH battery cabinet 1 and L Ni-MH battery cabinet average current Iave, meet: when the absolute value of (I-Iave)/Iave is greater than 50%, EMS EMS confirms that charge/discharge machine inerrancy and warning message do not exist the abnormal conditions that do not meet charge or discharge functional requirement, EMS EMS sends the equalized maintenance work order for battery rack 1 to battery management system BMS, battery management system BMS receives the instruction that EMS EMS enters equalized maintenance mode of operation, battery management system BMS receives intelligent switch K1 in Parallel Control cabinet, K2 state feedback information, if K1 and K2 are in closure state, battery management system BMS sends the instruction that disconnects K1 and K2 to Parallel Control cabinet, Parallel Control cabinet is carried out this instruction, battery management system BMS further confirms that K1 and K2 are after off-state, battery management system BMS sends closed intelligent switch Kj1 instruction, intelligent switch Kj1 execution closure completes the circuit turn-on with charge/discharge machine, EMS EMS reception battery management system BMS validation of information K1 and K2 are in off-state, Kj1 is in closure state, EMS EMS sends charge or discharge power instruction to charge/discharge machine, charge/discharge machine carries out inversion work, battery rack 1 is carried out to the operation of charge or discharge, battery rack 1 is in equalized maintenance pattern.Treat that equalized maintenance finishes dealing with, EMS EMS sends the finish command to charge/discharge machine, charge/discharge acc power reduces to zero, and then EMS EMS sends battery rack 1 equalized maintenance END instruction to battery management system BMS, and battery management system BMS commander Kj1 disconnects.
When any in standby mode in parallel, charged in parallel pattern, three kinds of patterns of parallel discharge pattern of microgrid Ni-MH battery energy storage system, if Ni-MH battery cabinet 1 occurs: the difference between (1) Ni-MH battery cabinet 1 electriferous state SOC value and L Ni-MH battery cabinet electriferous state SOC mean value reaches more than 15%, or (2), more than the difference between Ni-MH battery cabinet 1 cell minimum voltage Vmin and cell maximum voltage Vmax reaches 40n mv when Ni-MH battery cabinet 1 electriferous state SOC is 15%, wherein n is the quantity of Ni-MH battery cabinet 1 interior cell, or when the absolute value that (3) meets (I-Iave)/Iave between Ni-MH battery cabinet 1 charge or discharge electric current I and L Ni-MH battery cabinet average current Iave is greater than 50%, battery management system BMS sends open command in parallel to Parallel Control cabinet, intelligent switch K1 in Parallel Control cabinet, K2 carries out battery management system BMS instruction open circuit, due to unilateral diode D1, the one-way of D2, now Ni-MH battery cabinet 1 has just been realized the disconnection with other Ni-MH battery cabinet, and the work of other Ni-MH battery cabinet is not subject to large impact, just because Ni-MH battery cabinet 1 disconnects and disengaging work, the discharging current that Ni-MH battery cabinet 1 was born is originally shared in other Ni-MH battery cabinet operating current, and the information of Ni-MH battery cabinet 1 gathers via battery management system BMS, and be sent to EMS EMS, by EMS EMS, according to the balance policy of prior setting, carry out decision-making, enter into corresponding equalized maintenance pattern, and other Ni-MH battery cabinets are still parallel discharge pattern, the coupling of microgrid Ni-MH battery energy storage system in parallel discharge pattern and equalized maintenance pattern.
Claims (2)
1. a microgrid Ni-MH battery energy storage system, is characterized in that: a plurality of Ni-MH battery cabinet, Parallel Control cabinet, energy conversion system, AC power distribution cabinet/AC distribution panel, civil power two-way electrical connections successively that are electrically connected in parallel; AC power distribution cabinet/AC distribution panel is also connected with power load end unidirectional electrical, is also electrically connected to charge/discharge machine is two-way; Battery management system one end is connected with EMS is two-way, the other end respectively with Ni-MH battery cabinet, Parallel Control cabinet, energy conversion system, charge/discharge machine is two-way is connected; Described EMS respectively with energy conversion system, charge/discharge machine is two-way is connected; Described energy conversion system, it exchanges end and is connected with civil power by AC power distribution cabinet/AC distribution panel;
Described charging/generator is electrically connected to Ni-MH battery cabinet is two-way, and on the connecting circuit of Ni-MH battery cabinet positive terminal and charge/discharge machine positive terminal, be provided with fuse, on the connecting circuit of Ni-MH battery cabinet negative pole end and charge/discharge machine negative pole end, be provided with intelligent switch;
In described Parallel Control cabinet, unilateral diode is connected with fuse with after intelligent switch parallel connection, is then connected to the positive terminal of battery rack, forms circuit; After unilateral diode is in parallel with intelligent switch, be connected to the negative pole end of battery rack, form circuit.
2. a kind of microgrid Ni-MH battery energy storage system as claimed in claim 1, it is characterized in that: there is the function of moving under can a kind of pattern in charged in parallel pattern, parallel discharge pattern, standby mode in parallel, equalized maintenance pattern, or there is the function of moving under can a kind of pattern in the arbitrarily coupling of equalized maintenance pattern and charged in parallel pattern, parallel discharge pattern, three kinds of patterns of standby mode in parallel;
Charged in parallel mode operation described in while meeting the following conditions: (1) battery management system receives the command request that EMS requires to enter charge mode, (2) Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality, battery management system inerrancy and warning message, (3) energy conversion system inerrancy and warning message;
Parallel discharge mode operation described in while meeting the following conditions: (1) battery management system receives the command request that EMS requires to enter discharge mode, (2) Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality, battery management system inerrancy and warning message, (3) energy conversion system inerrancy and warning message;
Standby mode operation in parallel described in while meeting the following conditions: (1) battery management system receives the command request that EMS requires to enter standby mode, (2) Ni-MH battery cabinet without excess temperature, owe temperature, overvoltage, under-voltage, Abnormal Insulation, communication abnormality, or Ni-MH battery cabinet is in being full of or emptying state, battery management system inerrancy and warning message;
Equalized maintenance mode operation described in while meeting the following conditions: the difference between (1) certain Ni-MH battery cabinet electriferous state SOC value and a plurality of Ni-MH battery cabinet electriferous state SOC mean value reaches more than 15%; Or more than the difference in certain Ni-MH battery cabinet between cell minimum voltage Vmin and cell maximum voltage Vmax reaches 40*n mv when Ni-MH battery cabinet electriferous state SOC value is 15%, wherein n is the quantity of cell in described certain Ni-MH battery cabinet; Or Ni-MH battery cabinet electriferous state SOC value when certain Ni-MH battery cabinet reaches 1200*n mv with a certain equal multiplying power discharging to cell average voltage, the difference of Ni-MH battery cabinet electriferous state SOC value when reaching 1200*n mv with identical multiplying power discharging to cell average voltage for the first time after finishing with last equilibrium reaches more than 15%, and wherein n is the quantity of cell in described certain Ni-MH battery cabinet; Or between the charge or discharge electric current I of certain Ni-MH battery cabinet and a plurality of Ni-MH battery cabinet average current Iave, meet: the absolute value of (I-Iave)/Iave is greater than 50%; (2) inerrancy of charge/discharge machine and warning message;
Described in while meeting the following conditions, equalized maintenance pattern is moved with the coupled mode of described charged in parallel pattern, described parallel discharge pattern, described any one coupling of standby mode in parallel: a kind of pattern of (1) microgrid Ni-MH battery energy storage system in standby mode in parallel, charged in parallel pattern, parallel discharge pattern; (2) difference between certain Ni-MH battery cabinet electriferous state SOC value and a plurality of Ni-MH battery cabinet SOC mean value reaches more than 15%; Or more than the difference in certain Ni-MH battery cabinet between cell minimum voltage Vmin and cell maximum voltage Vmax reaches 40*n mv when Ni-MH battery cabinet electriferous state SOC is 15%, wherein n is the quantity of cell in described certain Ni-MH battery cabinet; Or between certain Ni-MH battery cabinet charge or discharge electric current I and a plurality of Ni-MH battery cabinet average current Iave, meet: the absolute value of (I-Iave)/Iave is greater than 50%.
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