CN106505605A - Sodium-sulphur battery power station energy storage subsystem - Google Patents

Sodium-sulphur battery power station energy storage subsystem Download PDF

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Publication number
CN106505605A
CN106505605A CN201611222296.7A CN201611222296A CN106505605A CN 106505605 A CN106505605 A CN 106505605A CN 201611222296 A CN201611222296 A CN 201611222296A CN 106505605 A CN106505605 A CN 106505605A
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China
Prior art keywords
energy
storage
sodium
sulphur
module
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CN201611222296.7A
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Inventor
范兵
孙贤书
施勇
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State Grid Shanghai Municipal Electric Power Co
Shanghai Electric Sodium Sulfur Energy Storage Technology Co Ltd
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State Grid Shanghai Municipal Electric Power Co
Shanghai Electric Sodium Sulfur Energy Storage Technology Co Ltd
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Application filed by State Grid Shanghai Municipal Electric Power Co, Shanghai Electric Sodium Sulfur Energy Storage Technology Co Ltd filed Critical State Grid Shanghai Municipal Electric Power Co
Priority to CN201611222296.7A priority Critical patent/CN106505605A/en
Publication of CN106505605A publication Critical patent/CN106505605A/en
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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
    • H02J15/00Systems for storing electric energy
    • 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

Abstract

The present invention relates to a kind of sodium-sulphur battery power station energy storage subsystem, including sodium-sulfur battery energy storage device, battery management system, conflux cabinet group, energy storage device heap storage, sodium-sulfur battery energy storage device includes some sodium sulphur energy-storage module groups, sodium sulphur energy-storage module group is connected with electrical network bus by energy conversion system, battery management system includes direct current administrative unit, battery management unit, cabinet group of confluxing includes some cabinets that conflux, sodium sulphur energy-storage module group includes some sodium sulphur energy-storage module strings, sodium sulphur energy-storage module string is connected with energy conversion system by the cabinet that confluxes, conflux direct current administrative unit is provided with cabinet, sodium sulphur energy-storage module string includes some sodium sulphur energy-storage modules, sodium sulphur energy-storage module includes sodium-sulfur battery module, battery management unit, sodium sulphur energy-storage module is in energy storage device heap storage.The invention provides a kind of sodium-sulphur battery power station energy storage subsystem with practicality, directiveness, with good commercial application prospect.

Description

Sodium-sulphur battery power station energy storage subsystem
Technical field
The present invention relates to a kind of battery power station energy storage subsystem, more particularly to a kind of sodium-sulphur battery power station energy storage subsystem, Belong to sodium-sulphur battery power station field.
Background technology
Energy storage referred to by medium or equipment, energy stores is got up using the method for chemistry or physics, according to should The process that demand is discharged with particular energy form, the energy storage that generally says refer to the energy storage for electric energy.Power energy storage technology For realizing electrical network target of sustainable development, solve the problems, such as electricity unbalanced supply-demand contradiction and improve power supply reliability to pull there is provided one Sub-solution.Using large-scale energy storage device, it is possible to reduce and delay for sending out, defeated, become, the investment of controller switching equipment, improve The utilization rate and power supply reliability of existing power equipment, reduces gross coal consumption rate, power supply line loss.Meanwhile, power network development also face itself Face electricity consumption peak-valley difference gradually to increase, electric power netting safe running risk increase after the increase of electrical network scale, mostly utility grid is to electric energy matter Amount requires the problems such as rising, new-energy grid-connected running technology new demand, solves these problems and builds intelligent grid, also to development electricity Power energy storage technology proposes urgent requirement.In every key core technology of intelligent grid, energy storage technology is started to walk relatively There is substantially deficiency with study on the industrialization in evening, technology maturation, the country is even more in the starting stage, needs badly and carry forward vigorously.Energy storage It is divided three classes according to energy-accumulating medium:The energy storage of physics energy storage, chemical energy storage and other forms.Physics energy storage mainly includes drawing water Accumulation of energy, compressed-air energy storage, flywheel energy storage etc., chemical energy storage mainly include lead-acid battery, lithium battery, flow battery, sodium sulphur electricity Energy storage of the battery forms such as pond, nickel-cadmium cell etc., the energy storage of other forms include ultracapacitor, superconducting magnetic energy storage etc..
As society is to the demand of electric power and production sustainable growth, the installed capacity, overlay area and load peak in electrical network Paddy difference constantly expands, and so substantial amounts of electricity needs is put forward higher requirement to the stability of electrical network, security, intellectuality. For this in the urgent need to such electric energy storing system matches therewith, with balancing electric power load, equipment operating efficiency and warp is improved Ji property, reduces or delays the investment of power construction, improves the adaptibility to response of electrical network burst accident, it is ensured that Operation of Electric Systems is pacified Entirely.Intermittent regenerative resource " can be spliced " by what is more important, electric energy storing system, improve power system Stability, so that solve the bottleneck problem of Renewable Energy Development.As load equalizer and stand-by power supply, power energy storage system Key technology necessary to system and intelligent grid and distributed energy resource system is little, negative for solving its fault rate height, power system capacity The problems such as lotus fluctuation is big.
Sodium sulphur energy-storage battery (hereinafter referred to as sodium-sulphur battery) is because its capacity is big, small volume, energy storage and high conversion efficiency, Life-span length, without geographical restrictions the advantages of, be especially suitable for power energy storage use.Through comprehensive comparative analysis, sodium-sulphur battery is current One of maximum energy storage mode of energy density, power density, is currently the only one kind while being completely suitable for power-type energy storage Energy-storage battery with energy type energy storage.After sodium-sulphur battery occurs as a newcomer in electrochmical power source family, in the world Upper many countries are greatly paid attention to and are developed.As sodium-sulphur battery has a series of features of high-energy battery, in the eighties End and the beginning of the nineties, apply (such as power station energy storage) under foreign countries give priority to sodium-sulphur battery as stationary applica-tions, and increasingly Show its superiority.Sodium-sulphur battery has been used successfully to stablizing for the regenerative resources such as peak load shifting, emergency power supply, wind-power electricity generation The aspect such as output and raising power quality.Sodium-sulphur battery technology and production technology relative maturity, but sodium-sulphur battery storage at present Can the through engineering approaches application of system lack practical experience, to sodium-sulfur battery energy storage system discharge and recharge operation characteristic, circular flow characteristic, Running of pumps in series parallel connection characteristic etc. still lacks the understanding of practicality, still lacks the rule of directiveness in terms of the system design that electrical network is accessed Model.
Content of the invention
Energy storage subsystem in sodium-sulphur battery power station of the present invention discloses new scheme, there is provided a kind of have practicality, guidance Property sodium-sulphur battery power station energy storage subsystem, solve the problems, such as prior art lack practical plan.
Energy storage subsystem in sodium-sulphur battery power station of the present invention includes sodium-sulfur battery energy storage device, battery management system, conflux cabinet Group, energy storage device heap storage, sodium-sulfur battery energy storage device include that some sodium sulphur energy-storage module groups, sodium sulphur energy-storage module group pass through energy Converting system is connected with electrical network bus, and battery management system includes direct current administrative unit, battery management unit, and cabinet group of confluxing includes Some cabinets that conflux, sodium sulphur energy-storage module group include some sodium sulphur energy-storage module strings, and sodium sulphur energy-storage module string is by cabinet and the energy of confluxing Amount converting system connection, is provided with direct current administrative unit in the cabinet that confluxes, sodium sulphur energy-storage module string includes some sodium sulphur energy-storage modules, sodium Sulphur energy-storage module includes sodium-sulfur battery module, battery management unit, and sodium sulphur energy-storage module is in energy storage device heap storage.
Further, the sodium-sulfur battery energy storage device of this programme includes sodium sulphur energy-storage module group first, sodium sulphur energy-storage module group second, Sodium sulphur energy-storage module group first includes that sodium sulphur energy-storage module string A, sodium sulphur energy-storage module string B, sodium sulphur energy-storage module string A include 10 5kW energy type sodium sulphur energy-storage modules, sodium sulphur energy-storage module string B include 10 5kW energy type sodium sulphur energy-storage modules, sodium sulphur energy storage mould Block group second includes that sodium sulphur energy-storage module string C, sodium sulphur energy-storage module string D, sodium sulphur energy-storage module string C include 10 5kW power-type sodium Sulphur energy-storage module, sodium sulphur energy-storage module string D include 2 25kW power-type sodium sulphur energy-storage modules.
Further, the sodium sulphur energy-storage module of this programme includes modular tank, is provided with sodium-sulfur battery module, electricity in modular tank Pond administrative unit, module direct current main power source output connection case, module communication interface, module communication interface be Ethernet interface or CAN interface or RS485 interfaces, 5kW energy type sodium sulphur energy-storage modules, the modular tank profile of 5kW power-type sodium sulphur energy-storage modules Size is 907mm × 986mm × 1038mm, the modular tank appearance and size of 25kW power-type sodium sulphur energy-storage modules be 2120mm × 1630mm×1100mm.
Further, the energy storage device heap storage of this programme includes that heap storage group first, heap storage group second, heap storage group first are included back-to-back simultaneously 2 5kW modules heap storage row's first that row is arranged, 5kW modules heap storage row's first include that 3 5kW module heap storages, heap storage group second include leaning against 2 5kW modules heap storage row's second, 1 25kW module heap storage that the back of the body is arranged side by side, 5kW modules heap storage row's second include 2 5kW modules Heap storage, 5kW module heap storages are upper and lower two-layer sphere of movements for the elephants shape storehouse cabinet structures, are provided with 4 in upper and lower two-layer sphere of movements for the elephants shape storehouse cabinet structure The position in storehouse of 5kW modules, 25kW module heap storages are that upper and lower two-layer " says " font storehouse cabinet structure, and upper and lower two-layer " says " font storehouse cabinet structure The position in storehouse of 2 25kW modules is inside provided with.
Further, the energy conversion system of this programme includes double mode energy accumulation current converter, some two-way DC converters, if The inverter side of dry two-way DC converter is connected in parallel to the DC side of double mode energy accumulation current converter, double mode energy accumulation current converter AC accesses electrical network bus, and sodium sulphur energy-storage module string is connected with double mode energy accumulation current converter by two-way DC converter.
Further, the double mode energy accumulation current converter of this programme includes DC side electromagnetic interface filter, Three-Phase PWM Rectifier, transformation The direct current that two-way DC converter is exported is converted into three-phase alternating current by device, AC BMI wave filters, double mode energy accumulation current converter Electricity input electrical network is powered to power load, and alternating current in electrical network is converted into direct current by two-way by double mode energy accumulation current converter Sodium sulphur energy-storage module string is input into after DC converter step-down.
Further, the two-way DC converter of this programme include input direct-current circuit breaker Q F1, output dc circuit breaker QF2, Input direct-current contactor KA1, output D.C. contactor KA3, input capacitor C1, output capacitor C2, direct current electromagnetic interface filter, Pre-charge resistance R1, pre-charge contactor KA2, reactor L1, half-bridge IGBT module, fuse FU1, two-way DC converter will The electric energy of sodium sulphur energy-storage module string is boosted by the electric energy step-down input sodium sulphur energy-storage module string of inverter side, two-way DC converter Double mode energy accumulation current converter is input into by inverter side afterwards.
Further, the battery management unit of this programme includes battery voltage sensing module, battery temperature detection control module, Direct current administrative unit includes that loop voltage detection module, loop current detection module, battery management unit control module, data are led to Letter interface, by data communication interface to host computer, energy conversion system transmitting function signal, direct current is managed direct current administrative unit Unit receives operating instruction, configuration information by data communication interface from Monitor Computer Control System, and direct current administrative unit is by electricity Pond administrative unit control module transmits above-mentioned operating instruction, configuration information to battery management unit.
Further, with battery management unit by RS485 bus communications, direct current management is single for the direct current administrative unit of this programme Unit is communicated by MODBUS with Monitor Computer Control System, energy conversion system.
Further, it is additionally provided with battery clothes/retired controller, battery supply controller, GPRS to set in the cabinet that confluxes of this programme Standby, Terminal Server Client monitors the ruuning situation in sodium-sulphur battery power station by GPRS device.
Energy storage subsystem in sodium-sulphur battery power station of the present invention provides a kind of sodium-sulphur battery power station with practicality, directiveness Energy storage subsystem, with good commercial application prospect.
Description of the drawings
Fig. 1 is the principle schematic of the sodium-sulphur battery power station energy storage subsystem of this programme.
Fig. 2 is the principle schematic of battery management system.
Fig. 3 is the principle schematic of two-way DC converter.
Fig. 4 is the principle schematic of double mode energy accumulation current converter.
Fig. 5 is the schematic top plan view of the heap storage group first of energy storage device heap storage.
Fig. 6 is the schematic top plan view of the heap storage group second of energy storage device heap storage.
Wherein, PCS is energy conversion system, and BMS is battery management system, and BMU is battery management unit, and DMU is direct current Administrative unit.
Specific embodiment
Sodium-sulphur battery power station is mainly made up of three parts:Sodium sulphur energy storage subsystem, power conversion subsystem and monitoring system System.Sodium sulphur energy storage subsystem mainly has the electrical equipments such as sodium sulphur energy-storage battery module, battery management system and the cabinet that confluxes, heap storage, Sodium-sulphur battery operation control and on-line checking are mainly realized.It is (DC/DC) and double that power conversion subsystem includes that bidirectional, dc is converted Pattern energy storage unsteady flow (AC/DC), realizes the bidirectional energy transmission between battery energy storage system dc-battery and AC network.Monitoring System is computer-based process control and dispatch automated system, mainly by groups such as work on the spot station and servers Into.
Sodium sulphur energy storage subsystem is most important subsystem in power station, including sodium-sulfur battery module, battery management system (BMS) it is and the cabinet that confluxes, by sodium-sulfur battery energy storage module, battery management subsystem, confluxes cabinet and heap storage constitutes energy-storage module heap. Sodium sulphur energy storage subsystem is gone here and there sodium sulphur energy-storage module by 2 group 4 and is constituted, and accesses 2 PCS, and each module string matches somebody with somebody 1 direct current administrative unit DMU and 1 cabinet that confluxes, matches somebody with somebody 1 battery management unit BMU per 1 module.1st group by 20 5kW energy type MCN-5E type sodium sulphur Battery module, point 2 strings are often gone here and there 10, link electrical network or load after accessing PCSA.2nd group is 10 5kW power-type MCN-5P types Sodium-sulfur battery module composition the 1st is gone here and there, and constitutes the 2nd string by 2 25kW power-type MCN-25P type sodium-sulfur battery modules, is respectively connected to Electrical network or load is linked after PCSB.The overall dimensions of 5kW battery modules are 907mm × 986mm × 1038mm, outside 25kW modules Molded dimension is 2120mm × 1630mm × 1100mm.
Sodium-sulphur battery management system (BMS) is main by direct current administrative unit (DMU) and battery management unit (BMU) two parts Composition, BMU are mainly responsible for the voltage of battery module and the detection of temperature, and loop voltage is responsible in the operation control of module temperature, DMU With the detection of electric current, the analysis and judgement of battery status are carried out according to the voltage of the battery module of BMU detections and temperature, and therefore Failure alarm signal and forbidden energy signal is sent during barrier to host computer and energy conversion system (PCS), and another DMU is also responsible for receiving monitoring System operating instructions and configuration information, the instruction for receiving and information are issued in BMU and are executed.Pass through between DMU and BMU RS485 bus communications, are communicated by MODBUS between DMU and Monitor Computer Control System and PCS.
, on battery module, its major function and technical parameter are as follows for BMU:
(1) battery or battery strings voltage, scope are detected:0~18V;Certainty of measurement:± 0.020V, each passage are independently adopted Collection, does not interfere with each other;
(2) measurement module exports total voltage, certainty of measurement ± 0.1FS%mV;
(3) temperature follows inspection, scope:0~500 DEG C, accuracy of temperature control ± 5 DEG C.Default factory heats up and arranges;Time and temperature Variable quantity can intelligent set;
(4) temperature control adopts PWM pulse-width regulateds, optically isolated control solid-state relay to adjust heating power;
(5) monitoring modular is switched to auto thermal compensation operational mode in charging and discharging state;
(6) communicated with DMU by outside RS485/CAN buses, communication speed 250kb/s sends battery data, battery shape State and warning information;
(7) 2 way switch amount output control functions are had;
(8) 6 way switch amount Input Monitor Connector functions are had;
(9) body fault self-checking function;
(10) immunity to interference grade:IV grade of IEC.
DMU is arranged on and confluxes in cabinet.DMU is the upper level management system of BMU, can at most manage 12 BMU, major technique Parameter and function are as follows:
(1) sodium sulphur energy-storage module string total voltage measurement, scope:0-640V, precision:±0.1V;
(2) charging and discharging currents measurement, scope:0~± 1000A, measuring accuracy:± 1.5A (depending on sensor accuracy);
(3) completely self-contained RS485 and CAN/LAN interfaces;
(4) bus at most can read cell voltage and temperature information with 12 BMU module communications;
(5), by CAN and PCS two-way communications, direct current branch discharge and recharge can control;
(6) LAN interface is communicated by ICP/IP protocol and system monitoring PC, reports branched battery voltage, temperature and other Information, and receive the order of control platform;
(7) SOC is estimated and SOH, and SOC estimation precision is less than 10%;
(8) 14 way switch amount Input Monitor Connector functions are provided;
(9) 6 way switch amount output control functions are provided;
(10) fault diagnosis and online warning (voltage, electric current, temperature and SOC);
(11) the monitor in real time of battery operation state is realized:Comprising charging process control instruction, discharge process control instruction, electricity Pond group temperature control, battery are managed completely;
(12) battery failures diagnosis and safeguard protection are realized:Comprising battery failures diagnosis, Failure Control instruction;
(13) there is self-inspection and self-diagnostic function:Can diagnose and process all kinds of BMU failures;
(14) cell safety:Over-charging of battery is prevented, is crossed and is put;To battery operation realtime monitoring, send in time maintenance request, The informations such as maintenance call, disabling request;
(15), after battery is using a period of time, need to carry out capacity check to battery, can be to using by holding inspection pattern The capacity of battery is detected;
(16) failure and inspecting state are uploaded:In system operation, if BMU breaks down or needs to overhaul, pass through The failure of device itself and maintenance signal are uploaded to energy-storage module heap monitoring system by failure and inspecting state upload function.
The cabinet that confluxes is an important part in sodium sulphur energy storage subsystem, summarizes the AC line of all battery modules in loop Cable, the clothes for energy conversion system being accessed by the cabinet that confluxes and controlling battery module/retired.In addition, the cabinet that confluxes is also responsible in loop The working power of battery module and the distribution and control of accessory power supply, right to realizing by realizing installed in the DMU confluxed in cabinet BMU operation control and manage, and to BMU gathered datas process and transmit, send when battery module breaks down warning and Forbidden energy signal.
Battery module in heap storage, installed using back-to-back mode, and first and second loop is by the upper and lower two-layer of heap storage point First group is installed together, and third and fourth loop is installed together for second group.Each heap storage can place 4 5kW battery moulds Block, point upper and lower two-layer arrangement, module numbering start definition clockwise from heap storage lower left.There are 25kW battery modules 2 in this power station, It is installed in a heap storage group, divides and install up and down.
Heap storage is in addition to as the carrier for carrying battery module, it may have protection and the effect of regulating cell modular environment, its Major function is as follows:
(1) heap storage adopts modularization, standardized designs, with part transport, in-site installation form;
Basic heap storage can carry out back-to-back or parallel, be vertically assembled into many position in storehouse heap storages.Each intermodule can arrange anti- Shield division board, needs to arrange fixing device after module is in place;
(3) each basic heap storage arranges ventilating opening, cigarette sense (humiture) monitoring device in position, and top arranges axle stream Blower fan, for the forced ventilation of basic heap storage;
(4) heap storage degree of protection is not less than IP54.
(5) heap storage directly can be mounted directly in concrete foundation of the flatness less than 2mm, also can be reserved in electric panel room Install on the basis of channel-section steel.
One important component part of battery energy storage system is exactly energy conversion system (Power Convertion System).Bidirectional energy transmission between sodium sulphur energy storage subsystem battery module and AC network can be realized by PCS, led to Management of charging and discharging of the control strategy realization to battery module is crossed, the tracking to net side load power, to battery energy storage system charge and discharge The control of electrical power, to control of voltage on line side under off-grid operation mode etc..PCS is mainly by two-way DC converter (DC/DC) Constitute with double mode energy accumulation current converter (AC/DC), to realize that the bidirectional energy between sodium sulphur energy storage subsystem and AC network is passed Pass.The effect of DC/DC two-way DC converters is that the voltage in loop is lifted to the double mode energy accumulation current converter work of suitable AC/DC Electric pressure, loop adopts a 50kW two-way DC converter (DC/DC), and converter is by three module crisscross parallels The charge-discharge electric power of battery module in loop is divided equally in work, three modules.The inverter side of DC/DC two-way DC converters is in parallel It is connected to the DC side of AC/DC current transformers.
In two-way DC/DC converters, input, output dc circuit breaker QF1, QF2, input and output D.C. contactor KA1, KA3, input and output capacitor C1, C2, direct current EMI, pre-charge resistance R1, pre-charge contactor KA2, reactor L1, H bridge IGBT Module, fuse FU1.When the positive work of two-way Buck/Boost converters (step-down/up type converter), T1, D2 coordinate work Make, energy AC/DC inverters flow to battery, from left to right, in Buck decompression modes.When T1 is turned on, C2 sides voltage adds To on diode D1, L1 and output capacitance C1, therefore D2 cut-offs.The voltage being now added on L is U1>U2, therefore inductive current is linear Increase energy to be stored in L in the form of magnetic field energy, and charge to battery simultaneously.When T1 is turned off, inductive current passes through D2 Afterflow, inductive current linearly reduce, and the energy storage of L is shifted to C1.When reverse operation, T2, D1 cooperating, energy is from battery Flow direction exchange AC/DC inverters, from right to left, in boost mode.When T2 is turned on, C1 is all added on inductance, inductive current Linearly increasing, electric energy is stored in L in the form of magnetic field energy, and diode D1 ends.When T2 is turned off, inductive current by D1 to Outlet side flows, and the energy storage on C1 and L1 is shifted to C2, i.e., charge to C2, and the voltage being now added on inductance is less than for U2-U1 Zero, so inductive current linearly reduces.In DC/DC conversion processes, controlled using the PI of voltage, current double closed-loop.Reality output Feedback signal U of voltageoSet-point U with output voltagedrefIt is compared, its difference generates inner ring (electric current through PI links Ring) given current signal Idref, IdrefValue of feedback I with inductive current againdlRelatively, pwm control signal is ultimately generated, and then The on off state of IGBT in control DC/DC main circuits, realizes that voltage stabilizing is exported.
The double mode energy accumulation current converters of AC/DC, as the interface between electrical network and sodium sulphur energy storage subsystem, are energy-storage systems Important component part, Main Function are that the direct current that DC/DC two-way DC converters are exported is converted into three-phase alternating current input Electrical network is powered to power load, it is also possible to which alternating current in electrical network is converted into direct current by DC/DC two-way DC converters Be stored in after step-down in sodium-sulfur battery module, realize the energy in bidirectional flow between sodium-sulphur battery and electrical network, and can achieve grid-connected, Off-grid operation is controlled.PCS energy accumulation current converter Functional Designs are as follows:
(1) DC side protection to error-polarity connection, DC side overvoltage/undervoltage are protected, DC side overcurrent protection, AC overcurrent protection, Short-circuit protection, AC overvoltage/undervoltage are protected, and AC crosses underfrequency protection, overtemperature protection, surge protection;
(2) the function such as pressure limiting electric discharge, invariable power electric discharge, constant-current discharge;
(3) isolated island detects function;
Micro-grid system based on sodium sulphur energy storage subsystem simultaneously, the control strategy of off-network seamless switching;
(5) active and idle control function;
(6) the high-multiplying power discharge function of sodium-sulphur battery self-characteristic is combined;
The AC of the double mode energy accumulation current converters of AC/DC can be directly connected under V/F off-grid operation patterns off-network load, Charging equipment, under P/Q patterns, connection electrical network is charged to battery;
(8) DC/DC two-way DC converters can be with the multiple different configurations of compatibility and the sodium-sulfur battery module of model;
(9) the multi-machine parallel connection of DC side and AC runs control function;
(10) man-machine interface and communication function.
AC/DC bimodulus current transformer and DC/DC DC converters are basically identical on hardware configuration, by mainly including power mould Block and the device such as reactor, contactor and breaker, electromagnetic interface filter, controller, isolating transformer, UPS composition.
Monitoring system is computer-based process control and dispatch automated system, it can be to microgrid inside Distributed power generation, energy storage device and load condition are monitored, when micro-grid connection operation, off-grid operation and state switch, root According to power supply and characteristic is met, control is optimized to its internal distributed power generation, energy storage device and load, realization is to microgrid Safe and stable operation, improves the efficiency of energy utilization of microgrid.Monitoring system is mainly monitored by distributed power generation, energy storage device prison Control, load monitoring, safety monitoring and electric energy quality monitoring are constituted.The mode for being designed with hierarchical control of micro-grid system, Three layers can be divided in logic, i.e. key-course, central control level, dispatching of power netwoks layer on the spot.Dispatching of power netwoks layer is microgrid and power distribution network Scheduling system, the angle coordinated scheduling micro-grid system of the safety, economical operation from whole electrical network.Central control level is whole microgrid The core of system, centralized management distributed power source, energy storage device and each type load, completes the monitoring and control of microgrid, root According to the ruuning situation of microgrid, real-time optimal control strategy, grid-connected, off-network, seamlessly transitting of stopping transport is realized, is born when being incorporated into the power networks Duty realizes that microgrid running optimizatin is acted on, and adjusts the electricity consumption situation that distributed power generation is exerted oneself with each type load in off-grid operation, real The steady state Safe Operation of existing microgrid.On the spot key-course by micro-grid system protection equipment and Local Controller constitute.Microgrid is on the spot Controller completes distributed power generation to frequency, the Primary regulation of voltage, and in-situ protection equipment completes the quick of micro-grid system failure Protection.
Monitoring system mainly gathers the information of subsystems and is collected, such as sodium sulphur energy storage subsystem, and energy is changed Subsystem, in addition also security monitor platform etc., is analyzed to the information for gathering and judges, and helps to run operating personnel and do Go out the control program of optimization.Monitoring system has data acquisition function, data processing function, control operation function, fault warning Function, Event handling, human-computer interaction function etc..
(1) data acquisition function
Distributed power generation, energy storage device running state parameter are acquired, at least include a group terminal voltage, group end electric current, The telemetered signals such as state-of-charge, temperature, and the remote signals such as on off state, trouble-signal, abnormal signal.Electricity to current transformer The telemetered signals such as pressure, electric current, temperature, and the remote signals such as on off state, trouble-signal, abnormal signal are acquired.To matching somebody with somebody The voltage of grid interface, electric current, phase place, frequency, active power, reactive power, power factor, active energy, capacity of idle power etc. Telemetered signal and on off state, trouble-signal, abnormal signal etc. are acquired.
(2) data processing function
Carry out calculating analysis, more line alarm, reasonableness check etc. to process, and deposit related data to gathered data Storage.
(3) control operation function
Realize division control to the respective switch equipment of energy-storage system, and the charging and discharging state of energy storage device is controlled System.
(4) fault warning function
Possess the alarming determining and removing, inquiry of reporting to the police, self-defined alert levels, system of reporting to the police of trouble-signal and abnormal signal The functions such as meter analysis, warning message storage, and the realization of the forms such as figure, voice, word, printing can be passed through.
(5) Event handling
Can achieve to the journal of event, positioning and the function such as fault message inquiry on the spot.
(6) human-computer interaction function
Menu display function.Can to energy-storage system electrical structure diagram, charging and discharging curve figure and system realtime curve, The figure shows such as data pie chart, block diagram are provided as needed, it is possible to provide main matter order shows.Interactive operation function.Send out When sending remote control, school etc., people's station, alarming determining, operation, editor and modification database, the figure such as listed is realized in man-machine interface Etc. information.Report Server Management function.The Automatic generation of information such as data, exception and accident information, operation note are carried out to energy-storage system Form, enters edlin, storage, inquiry, and possesses the functions such as timed print, calling printing to form.
(7) interconnect with automatic information system
With the related systems such as dispatch automated system, electrical power distribution automatization system, marketing management system interconnect, realize data and Information is exchanged.
In power station, 5kW number of modules is 30,25kW number of modules 2, wherein:
(1) MCN-5E modules 20, configure 5 groups of heap storage, constitute 100kW sodium sulphur energy-storage module string groups, and point 2 tunnels are respectively connected to PCS-A-1 and PCS-A-2 grid-connecting apparatus DC/DC DC loops.
(2) MCN-5P modules 10, configure 3 groups of heap storage, constitute 50kW sodium sulphur energy-storage module strings, access the grid-connected dresses of PCS-B-1 Put DC/DC DC loops.
(3) MCN-25P modules 2,1 group of configuration 25kW modules heap storage, constitute 50kW sodium sulphur energy-storage module strings, access PCS- B-2 grid-connecting apparatus DC/DC DC loops.
Energy storage subsystem installation region position, the cabinet that confluxes are disposed within, open wall and arrange a maintenance channel and set fire door.Conflux cabinet Installation site is easy to packet and maintenance to module string, prevents maloperation near to module heap storage.
Power equipment, circuit, module and the electronic devices and components being related in such scheme in addition to special instruction, according to which The concrete function of realization can select design generally in the art and scheme, it is also possible to select according to actual needs other design and Scheme.
The sodium-sulphur battery power station energy storage subsystem of this programme is devised from the energy storage subsystem design of Demonstration Station The function and structure of PCS energy conversion systems, it is stipulated that the technical parameter of two-way DC converter and double mode energy accumulation current converter, Devise energy storage monitor system architecture and hierarchical structure, it is stipulated that the basic function of energy storage monitor system body and extension work( Can, it is proposed that energy-storage system accesses monitoring system for power distribution networks performance indications, optimizes the communication structure of system, and in heaps to module Mode is designed.Based on above content and feature, the sodium-sulphur battery power station energy storage subsystem of this programme has prominent reality Matter feature and significant progress.
The sodium-sulphur battery power station energy storage subsystem of this programme is not limited to the content disclosed in specific embodiment, embodiment The technical scheme of middle appearance can be extended based on the understanding of those skilled in the art, and those skilled in the art are tied according to this programme The simple alternative that conjunction common knowledge is made falls within the scope of this programme.

Claims (10)

1. sodium-sulphur battery power station energy storage subsystem, is characterized in that including sodium-sulfur battery energy storage device, battery management system, conflux cabinet Group, energy storage device heap storage, the sodium-sulfur battery energy storage device include some sodium sulphur energy-storage module groups, the sodium sulphur energy-storage module group It is connected with electrical network bus by energy conversion system, the battery management system includes direct current administrative unit, battery management unit, The cabinet group of confluxing includes that some cabinets that conflux, the sodium sulphur energy-storage module group include some sodium sulphur energy-storage module strings, the sodium sulphur Energy-storage module string is connected with the energy conversion system by the cabinet that confluxes, and is provided with direct current administrative unit in the cabinet that confluxes, described Sodium sulphur energy-storage module string includes that some sodium sulphur energy-storage modules, the sodium sulphur energy-storage module include sodium-sulfur battery module, battery management Unit, the sodium sulphur energy-storage module is in the energy storage device heap storage.
2. energy storage subsystem in sodium-sulphur battery power station according to claim 1, it is characterised in that the sodium-sulfur battery energy storage dress Put including sodium sulphur energy-storage module group first, sodium sulphur energy-storage module group second, the sodium sulphur energy-storage module group first includes sodium sulphur energy-storage module String A, sodium sulphur energy-storage module string B, the sodium sulphur energy-storage module string A include 10 5kW energy type sodium sulphur energy-storage modules, the sodium sulphur Energy-storage module string B includes that 10 5kW energy type sodium sulphur energy-storage modules, the sodium sulphur energy-storage module group second include sodium sulphur energy-storage module String C, sodium sulphur energy-storage module string D, the sodium sulphur energy-storage module string C include 10 5kW power-type sodium sulphur energy-storage modules, the sodium sulphur Energy-storage module string D includes 2 25kW power-type sodium sulphur energy-storage modules.
3. energy storage subsystem in sodium-sulphur battery power station according to claim 2, it is characterised in that the sodium sulphur energy-storage module bag Modular tank is included, sodium-sulfur battery module, battery management unit, module direct current main power source output connection in the modular tank, is provided with Case, module communication interface, the module communication interface is Ethernet interface or CAN interface or RS485 interfaces, the 5kW energy Type sodium sulphur energy-storage module, the modular tank appearance and size of 5kW power-type sodium sulphur energy-storage modules are 907mm × 986mm × 1038mm, The modular tank appearance and size of the 25kW power-types sodium sulphur energy-storage module is 2120mm × 1630mm × 1100mm.
4. energy storage subsystem in sodium-sulphur battery power station according to claim 2, it is characterised in that the energy storage device heap storage bag Heap storage group first, heap storage group second is included, the heap storage group first includes 2 5kW modules heap storage row's first being arranged side by side back-to-back, described 5kW modules heap storage row's first includes that 3 5kW module heap storages, the heap storage group second include 2 5kW modules being arranged side by side back-to-back Heap storage row's second, 1 25kW module heap storage, the 5kW modules heap storage row second include 2 5kW module heap storages, the 5kW module stacks Storehouse is upper and lower two-layer sphere of movements for the elephants shape storehouse cabinet structure, is provided with the storehouse of 4 5kW modules in the upper and lower two-layer sphere of movements for the elephants shape storehouse cabinet structure Position, the 25kW modules heap storage is that upper and lower two-layer " says " font storehouse cabinet structure, and the upper and lower two-layer " is said " in font storehouse cabinet structure It is provided with the position in storehouse of 2 25kW modules.
5. energy storage subsystem in sodium-sulphur battery power station according to claim 1, it is characterised in that the energy conversion system bag Double mode energy accumulation current converter, some two-way DC converters is included, the inverter side of some two-way DC converters simultaneously couples To the DC side of the double mode energy accumulation current converter, the AC of the double mode energy accumulation current converter accesses electrical network bus, described Sodium sulphur energy-storage module string is connected with the double mode energy accumulation current converter by the two-way DC converter.
6. energy storage subsystem in sodium-sulphur battery power station according to claim 5, it is characterised in that the double mode energy storage unsteady flow Device includes DC side electromagnetic interface filter, Three-Phase PWM Rectifier, transformer, AC BMI wave filters, the double mode energy storage unsteady flow The direct current that the two-way DC converter is exported is converted into three-phase alternating current input electrical network or is powered to power load by device, institute State double mode energy accumulation current converter and alternating current in electrical network is converted into direct current input after two-way DC converter step-down The sodium sulphur energy-storage module string.
7. energy storage subsystem in sodium-sulphur battery power station according to claim 5, it is characterised in that the two-way DC converter Including input direct-current circuit breaker Q F1, output dc circuit breaker QF2, input direct-current contactor KA1, output D.C. contactor KA3, Input capacitor C1, output capacitor C2, direct current electromagnetic interface filter, pre-charge resistance R1, pre-charge contactor KA2, reactor The electric energy step-down of inverter side is input into the sodium sulphur by L1, half-bridge IGBT module, fuse FU1, the two-way DC converter Energy-storage module string, the two-way DC converter will be input into by inverter side after the electric energy boosting of the sodium sulphur energy-storage module string The double mode energy accumulation current converter.
8. energy storage subsystem in sodium-sulphur battery power station according to claim 1, it is characterised in that the battery management unit bag Include battery voltage sensing module, battery temperature detection control module, the direct current administrative unit include loop voltage detection module, Loop current detection module, battery management unit control module, data communication interface, the direct current administrative unit pass through the number According to communication interface to host computer, energy conversion system transmitting function signal, the direct current administrative unit is by the data communication Interface receives operating instruction, configuration information from Monitor Computer Control System, and the direct current administrative unit passes through the battery management list First control module transmits the operating instruction, configuration information to the battery management unit.
9. energy storage subsystem in sodium-sulphur battery power station according to claim 8, it is characterised in that the direct current administrative unit with The battery management unit is turned with the Monitor Computer Control System, energy by RS485 bus communications, the direct current administrative unit Change system to communicate by MODBUS.
10. energy storage subsystem in sodium-sulphur battery power station according to claim 1, it is characterised in that also sets in the cabinet that confluxes There are battery clothes/retired controller, battery supply controller, GPRS device, Terminal Server Client to monitor sodium by the GPRS device The ruuning situation in sulphur battery power station.
CN201611222296.7A 2016-12-27 2016-12-27 Sodium-sulphur battery power station energy storage subsystem Pending CN106505605A (en)

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