CN103117552A - Hybrid energy storage system based on ordered energy control - Google Patents

Hybrid energy storage system based on ordered energy control Download PDF

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Publication number
CN103117552A
CN103117552A CN2013100702531A CN201310070253A CN103117552A CN 103117552 A CN103117552 A CN 103117552A CN 2013100702531 A CN2013100702531 A CN 2013100702531A CN 201310070253 A CN201310070253 A CN 201310070253A CN 103117552 A CN103117552 A CN 103117552A
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energy storage
battery group
control module
flow controller
discharge
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CN103117552B (en
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孙树敏
陈嵩
李广磊
慕忠君
程艳
曹同利
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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Abstract

The invention relates to a hybrid energy storage system comprising various energy storage carriers. The system is mainly based on an ordered energy control strategy, the energy storage carriers are selectively discharged in a current-limiting or power-limiting mode through a pulse width modulation (PWM) closed-loop control principle and a monitoring system selective control principle, the advantages of the energy storage carriers are combined and complemented, the disadvantages of the energy storage carriers are overcome, and the aim of ordered energy utilization of different energy storage carriers is fulfilled according to a discharge priority sequence, namely a third energy storage subsystem, a second energy storage subsystem and a first energy storage subsystem. By the hybrid energy storage system, the phenomenon that the power of a power grid fluctuates because a wind and light power generation system or a high-power load and the like are connected to the power grid is avoided, smoothing compensation is realized, the quality of electric energy is improved, and the stable operation of the power grid is ensured.

Description

Based on the orderly mixed energy storage system of controlling of energy
Technical field
The present invention relates to a kind of electric power system energy-storage system and method, relate in particular to a kind of mixed energy storage system of controlling in order based on energy.
Background technology
Along with country constantly promotes intelligent grid, microgrid, renewable new energy source and Development of Electric Vehicles etc., also obtained fast development as the energy storage technology that its key technology supports.Present common energy storage form can be divided into four classes: electrochemical energy storage, physics energy storage, Power Flow and phase-change accumulation energy.The energy storage modes such as wherein, physics energy storage, Power Flow and phase-change accumulation energy are used because the restriction that is subjected to the aspects such as technical merit, geographical environment, service conditions, up-front investment expense can't realize large-scale development temporarily.Yet, along with electrochemical techniques constantly break through, having high efficiency energy storage capacity, good anti-environment serviceability, excellent operation maintenance convenience and the relatively low electrochemical energy storage of up-front investment cost, the development that has obtained advancing by leaps and bounds reaches Demonstration Application widely.
In existing electrochemical energy storage Demonstration Application, usually extensive with lead-acid battery energy-storage system, lithium ion battery energy storage system and super capacitance cell energy-storage system etc.Wherein, with the energy-storage system of lead-acid battery as the energy storage carrier, possess skills maturation, stored energy capacitance is high, anti-environment is good, low-cost, recycling rate advantages of higher, but its weight energy ratio, volume energy are lower, cycle-index is less, and easily causes certain pollution in a large amount of manufacturings or recycling process.With the energy-storage system of lithium ion battery as the energy storage carrier, have that high efficiency, high-energy-density, discharge voltage are stable, self discharge efficient is low, memory-less effect and the advantage such as pollution-free, but because the lithium ion battery cost of raw material is higher, complex manufacturing technology, cause it expensive, in addition, lithium ion battery is strict to discharging and recharging the aspects such as control and running environment, still can not realize large-scale application.With the energy-storage system of super capacitance cell as the energy storage carrier, have the characteristics such as can reach up to ten thousand overlength cycle life, the large current density power is strong, energy conversion efficiency is high, the ultralow temperature operation characteristic is good, in electric power system multiplex in short time, powerful load level and smooth and quality of power supply branch power occasion, but its discharge time is shorter, specific energy is lower, can't satisfy the requirement of electrical network being carried out continued power.
along with the exhaustion of the energy and the proposition of low-carbon (LC) life, renewable new forms of energy have obtained fast development and large-scale application, because the electricity generation systems such as photovoltaic, wind-force have stronger randomness, fluctuation, thereby have affected the electrical network quality of power supply largely, in addition, in order to satisfy the fast and stable development of national economy, high power, jumbo load has also arrived extensive application, to a certain extent the electrical network quality of power supply has also been caused certain influence, this just needs the configuration energy-storage system to provide high arteries and veins to fill power with level and smooth photovoltaic generation, output power of wind power generation and high power load are used the power network fluctuation spike that causes, effectively regulate the line voltage that generation of electricity by new energy and high-power equipment electricity consumption cause, the frequency meter phase place changes, equally also need energy-storage system to have high power capacity power storage and releasability, thereby can be continuously mains supply to guarantee the normal operation of critical load.Yet from present existing energy storage technology practical application, lead-acid battery, lithium ion battery or super capacitor are used as single energy-storage system, as shown in Figure 1.Lead-acid battery energy-storage system mass-energy ratio, volume energy is lower and cycle-index is less, and a large amount of make or the recycling process in easily causing certain pollution; Lithium ion battery energy storage system is because adopting the cost of raw material higher, and complex manufacturing technology causes it expensive, in addition, lithium ion battery to discharge and recharge control and the aspects such as running environment strict, and overcharge, cross put or the excess temperature situation under blasted, have potential safety hazard; Super capacitance cell energy-storage system its discharge time is shorter, specific energy is lower, can't satisfy the requirement of electrical network being carried out continued power.Therefore, if to better satisfy electrical network to energy-storage system high power capacity, long-life, high energy storage in discharge, arteries and veins fills peak value smoothly and the requirement of low up-front investment cost etc., need energy-storage system both to possess the characteristics such as high-specific-power, high cycle life, simultaneously can effectively reduce energy-storage system cost of investment, floor space, own wt etc. again, and the energy-storage system of using single energy storage carrier all can not satisfy above-mentioned requirements.
Summary of the invention
Purpose of the present invention is exactly for addressing the above problem, a kind of mixed energy storage system of controlling in order based on energy is provided, it is good by the anti-environment of comprehensive utilization lead-acid battery, the low recoverable etc. that reaches of cost, lithium ion battery high efficiency, high-energy-density, discharge voltage are stable, service life cycle is more high and the advantages such as super capacitor high-specific-power, high cycle life realize having complementary advantages, and maximize favourable factors and minimize unfavourable ones.adopt the Selective Control method by background monitoring system, realize when peak power deviate or other abnormal conditions appear in electrical network, characteristic in conjunction with different energy storage carrier super capacitance cell in useful life groups>lithium ion battery group>lead-acid battery group, control in order utilization by super capacitance cell group → lithium ion battery group → lead-acid battery group energy, thereby effectively reducing regenerative resource hits filling of electric power system, realization is regulated the electrical network peak load shifting, reduce the electrical network peak value, improve power grid quality, fully guarantee whole network system Operation safety, stability and reliability.
For achieving the above object, the present invention adopts following technical scheme:
A kind of mixed energy storage system of controlling in order based on energy, it comprises three energy storage subsystems:
The first energy storage subsystem comprises that lead-acid battery group, first is from control module BMU, the first main control module BMS and the first Bidirectional variable-flow controller ACDC, the lead-acid battery group is connected from control module BMU with being connected with the first Bidirectional variable-flow controller ACDC respectively, first is connected with the first main control module BMS from control module BMU, and the first main control module BMS is connected with background monitoring system;
The second energy storage subsystem comprises that lithium battery group, second is from control module BMU, the second main control module BMS and the second Bidirectional variable-flow controller ACDC, the lithium battery group is connected from control module BMU with being connected with the second Bidirectional variable-flow controller ACDC respectively, second is connected with the second main control module BMS from control module BMU, and the second main control module BMS is connected with background monitoring system;
The 3rd energy storage subsystem comprises that super capacitance cell group, the 3rd is from control module CM U, the 3rd main control module CMS and the 3rd Bidirectional variable-flow controller ACDC, the super capacitance cell group is connected from control module CM U with the 3rd with the 3rd Bidirectional variable-flow controller ACDC respectively, the 3rd is connected with the 3rd main control module CMS from control module CM U, and the 3rd main control module CMS is connected with background monitoring system;
Respectively be responsible for respectively lead-acid battery group, lithium ion battery group, voltage, electric current, monitoring temperature and the alarm and protection of super capacitance cell group, electric quantity balancing from the control module, simultaneously institute's detection information reported separately main control module by the CAN bus respectively; Each main control module is accepted the voltage, temperature, the current information that report, and record discharges and recharges number of times, estimates simultaneously lead-acid battery group, lithium battery group and super capacitance cell group remaining capacity SOC, assesses its health status SOH separately; Communicate by letter with background monitoring system in addition, complete upload lead-acid battery group, lithium battery group and super capacitance cell group abnormality alarming, constant data in time between the daily record data, and the operational order that background monitoring system issues is passed to down respectively each main control module; Each main control module is communicated by letter with separately Bidirectional variable-flow controller ACDC respectively, complete and upload lead-acid battery group, lithium battery group and super capacitance cell group abnormality alarming, when lead-acid battery group or lithium ion battery group or super capacitance cell group generation overvoltage, under-voltage, overcurrent and excess temperature situation, ask corresponding Bidirectional variable-flow controller ACDC to realize discharging and recharging power and control, and pass to corresponding main control module under the operational order that respectively each Bidirectional variable-flow controller ACDC is issued.
Be incorporated into the power networks and operation of power networks when normal, each main control module and from the control module by to the detection of each battery voltage, temperature, electric current, assess three energy storage subsystem remaining capacity SOC, and upload the data to Bidirectional variable-flow controller part, the Bidirectional variable-flow controller is by judgement, as the need charging, each battery pack is charged; As not charging, duty is pressed the float charge voltage charging;
When electrical network because of renewable generation of electricity by new energy or load electricity consumption initial t 0When constantly instantaneous power occurring and exceeding the target power scope, by different energy storage subsystem SOC being detected assessment and controlling, judgement is also controlled in order by super capacitance cell group → lithium ion battery group → lead-acid battery group energy and is utilized principle, whether decision discharges to electrical network, the target power value range occurs exceeding with effectively level and smooth electrical network, realize " peak load shifting ".
From network operation the time, at first by each main control module with detect different battery pack remaining capacity SOC and report each Bidirectional variable-flow controller and background monitoring system from the control module, control each Bidirectional variable-flow controller by background monitoring system, according to different battery pack state-of-charge SOC, judgement also utilizes principle to realize whether network load is powered by controlling in order by super capacitance cell group → lithium ion battery group → lead-acid battery group energy; Simultaneously; after the super capacitance cell group is being discharged and is being protected by the 3rd main control module CMS, the 3rd Bidirectional variable-flow controller ACDC; give the 3rd subsystem charging by the second energy storage subsystem, the first energy storage subsystem successively; at this moment; the 3rd Bidirectional variable-flow controller ACDC controls the 3rd subsystem power output, is mainly powered to network load by the second energy storage subsystem, the first energy storage subsystem successively thereafter.
While occurring that instantaneous power exceeds the target power scope, concrete charge and discharge process is: judge first whether each battery pack SOC reaches setting value, as do not reach, each Bidirectional variable-flow is controlled it each battery pack is protected, and forbids electric discharge; If reach, at t 0Constantly, the second Bidirectional variable-flow controller ACDC, the first Bidirectional variable-flow controller ACDC to lithium battery group, lead-acid battery group limit power, control the electric discharge of super capacitance cell group by the 3rd Bidirectional variable-flow controller ACDC respectively; Judge subsequently whether abnormal power recovers, as recovered, the 3rd energy storage subsystem stops electric discharge; As do not recovered, the super capacitance cell group continues electric discharge, at t iThe super capacitance cell group is discharged to its alarm voltage U constantly The c alarmThe time, the second Bidirectional variable-flow controller discharges lithium battery group output power limit, by the lithium battery group, is discharged; Judge whether abnormal power recovers, as recovered, the lithium battery group stops electric discharge again; As do not recovered, continue to discharge into t I+1Constantly, this moment, the super capacitance cell group discharged into its protection magnitude of voltage U The c protectionStop electric discharge, lithium ion battery continues electric discharge; To t I+2 constantlyThe lithium battery group discharges into the alarm voltage U The L alarm, the first Bidirectional variable-flow controller ACDC discharges lead-acid battery group output power limit, by the lead-acid battery group, starts electric discharge; Judge again whether abnormal power recovers, as recovered, the first energy storage subsystem stops electric discharge; As do not recovered, at t I+3Constantly, the lithium battery group is discharged to protection magnitude of voltage U L protects ProtectStop electric discharge, the lead-acid battery group continues electric discharge; To t I+4The lithium battery group is discharged to protection magnitude of voltage U constantly The L protectionStop electric discharge, whole mixed energy storage system electric discharge finishes.
From net the time, initial T 0Constantly calculate each battery pack SOC value, if do not reach set point each Bidirectional variable-flow controller is protected corresponding battery pack and forbidden discharging; If reach set point, second, third energy storage subsystem carries out output power limit to lithium battery group, lead-acid battery group, controls the super capacitance cell group by the 3rd Bidirectional variable-flow controller ACDC and discharges; Judge whether abnormal power recovers, as recovering, stop discharge; As not recovering, continue discharge, at T iConstantly, the super capacitance cell group discharges into the alarm voltage U The C alarm, the second Bidirectional variable-flow controller ACDC discharges lithium battery group output power limit, is discharged by the lithium battery group; Judge again whether abnormal power recovers, as recovering, stop discharge; As not recovering, at T i+1Super capacitance cell discharges into protection magnitude of voltage U constantly The c protectionStop discharge, the lithium battery group continues discharge; At T i+2The lithium battery group discharges into the alarm voltage U constantly The L alarm, the first Bidirectional variable-flow controller discharges lead-acid battery group output power limit, is discharged by the lead-acid battery group; Judge again whether abnormal power recovers, as recovering, stop discharge; As not replying, at T i+3The lithium battery group is discharged to protection magnitude of voltage U constantly The L protectionStop discharge, lead-acid battery continues discharge; At T i+4Lead-acid battery is discharged to the downscale protection voltage U constantly q Protection, stopping discharge, whole mixed energy storage system discharge finishes.
Mixed energy storage system itself based on energy is controlled in order comprises its whole topology and electrical structure, function, control strategy etc.Simultaneously, also adopt the Selective Control method based on this mixed energy storage system, by the background monitoring system scheduling controlling, realize that three kinds of different energy storage carriers control the principle of utilization in order by super capacitor 1 → lithium ion battery 2 → lead-acid battery 3 energy, and fully in conjunction with different energy storage carrier pluses and minuses, have complementary advantages, maximize favourable factors and minimize unfavourable ones, a kind of aspect problem methods such as low life-span of energy-storage system of single energy storage carrier of better solution, expensive, low specific energy, low specific power and poor stability are provided.
The invention has the beneficial effects as follows: by abundant utilization and performance lead-acid battery, lithium ion battery and super capacitance cell advantage separately, maximize favourable factors and minimize unfavourable ones, adopt the Selective Control method by control in order the principle of utilization by super capacitor 1 → lithium ion battery 2 → lead-acid battery 3 energy, satisfied preferably electrical network to energy-storage system in requirements such as aspect of performance high power capacity, long-life, high-energy-density, high-specific-powers, and, the requirement such as floor space little, own wt light low in the application facet cost of investment.
The different energy storage subsystems of this mixed energy storage system, aspect internal control, different energy storage carriers are in charge of by different battery management systems separately respectively, fully guarantee the total system data acquisition, upload or pass down and real-time, the accuracy of alarm protection etc., avoid system data transmission phase mutual interference and cause data upload or biographys, fault warning protection etc. are wrong or delay time down; Aspect system is incorporated into the power networks, different energy storage carriers connect respectively a cover Bidirectional variable-flow controller, adopt simultaneously Bidirectional variable-flow controller AC parallel method, control by the supervisory control system United Dispatching, but thereby different energy storage subsystem independent operatings had both been realized, realize again a whole set of mixed energy storage system overall operation under energy is controlled in order, finally improved this mixed energy storage system operational flexibility and controllability, guaranteed total system safety, stable, reliability service.
When the operation of electrical network, usually can produce power fluctuation because of accesses such as wind, light power generating system or high power loads.But when the short-time pulse power fluctuation appears in electrical network, can be by preferential the 3rd energy storage subsystem that starts of monitoring and dispatching system, the second Bidirectional variable-flow controller, the first Bidirectional variable-flow controller utilize pulse modulation respectively the second energy storage subsystem, the first energy storage subsystem to be carried out output power limit simultaneously, fully handle up and capability of fast response than high impulse power in conjunction with the 3rd energy storage subsystem super capacitance cell group, and discharge and recharge the performance advantages such as number of times height, realized better the compensation of the 3rd subsystem to electrical network short-time pulse power fluctuation.By this control method, both reached the purpose of level and smooth electrical network short-time pulse peak power, reduce again system to the second energy storage subsystem, the first energy storage subsystem frequent starting, thereby guaranteed on the basis of power grid operation, better improved mixed energy storage system useful life.
When the power fluctuation that occur to continue when electrical network or peak of power consumption etc. are abnormal, the 3rd energy storage subsystem provides in short-term high-power output to can not meet far away to improve the abnormal requirement of operation of power networks, and also needing to possess the high energy storage system provides more multi-energy for the fluctuation of electrical network continuous power or peak of power consumption period.mixed energy storage system is continued the needs of Power supply in order to satisfy electrical network, when the 3rd energy storage subsystem is discharged to the protection value, start the second energy storage subsystem by supervisory control system, be mains supply by the second energy storage subsystem lithium ion battery group, in conjunction with lithium ion battery group high-energy-density, than advantages such as lead-acid battery group high life, both made up the deficiency of the low stored energy of super capacitance cell group, the access times of the lead-acid battery group in low useful life have also been reduced simultaneously, improved to a certain extent conventional lead-acid battery energy-storage system volume energy ratio, the shortcoming that weight energy is lower, better satisfied the fabricating yard to the high volume energy ratio of energy-storage system, the requirement of high weight energy ratio.The final demand that had both guaranteed that electrical network was exported the energy-storage system higher-energy, also improved to a certain extent the whole service life of mixed energy storage system, and better satisfied the strict demand of erecting bed to energy-storage system installation volume, weight etc., fully save and reduce the energy-storage system installing space and required load capacity is installed, having improved energy-storage system engineering construction quality.
When electrical network needs how lasting energy to give level and smooth and the second energy storage subsystem institute stored energy of power can't to meet the demands, start the first energy storage subsystem, in conjunction with the high stored energy of lead-acid battery group, low cost, recoverable rate advantages of higher, can either better satisfy the mixed energy storage system high energy demand, can better make up the super capacitance cell group again, the lithium ion battery group is expensive, the shortcomings such as recovery utilization rate is low have improved better that conventional energy-storage system is expensive, the deficiency such as low capacity, recoverable rate are low.
By different energy storage subsystems in mixed energy storage system are controlled in order, the shortcomings such as the single control of energy-storage system, flexibility and the reasonable structure of conventional mixed energy storage system and conventional single energy storage carrier be poor have better been improved, satisfied preferably electrical network to energy-storage system in requirements such as aspect of performance high power capacity, long-life, high-energy-density, high-specific-powers, and, the requirement such as floor space little, own wt light low in the application facet cost of investment.Effectively solve renewable new forms of energy and high power capacity load filling of electric power system hit, realized better the electrical network peak load shifting is regulated, finally guaranteed whole network system Operation safety, stability and reliability.
Description of drawings
Fig. 1 is system construction drawing of the present invention;
Fig. 2 is control strategy figure of the present invention.
Wherein, 1. lead-acid battery group, 2. lithium battery group, 3. super capacitance cell group, 4. the first main control module BMS, 5. the second main control module BMS, 6. the 3rd main control module CMS, 7. first from control module BMU, and 8. second from control module BMU, 9. the 3rd from control module CM U, 10. the first Bidirectional variable-flow controller ACDC, 11. second Bidirectional variable-flow controller ACDC, 12. the 3rd Bidirectional variable-flow controller ACDC, 13. background monitoring system, 14. loads.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
In Fig. 1, energy storage carrier part: lead-acid battery group 1, lithium battery group 2 and super capacitance cell group 3; Wherein, lead-acid battery group 1 and lithium battery group 2 are as the energy type storage battery, fully in conjunction with lead-acid battery and lithium ion battery pluses and minuses, maximize favourable factors and minimize unfavourable ones, make its two kinds of storage batterys reach mutual supplement with each other's advantages at aspects such as up-front investment cost, capacity storage, floor space, useful life and recyclings.Possess as power type super capacitor batteries group 3 that more than sustainable 10s, high arteries and veins fills the multiplying power discharging advantage, have complementary advantages forming aspect energy and multiplying power with energy type lead-acid battery group 1 and lithium battery group 2.
Bidirectional variable-flow control section: adopt the monopole designs scheme, mainly be formed by combining by the first Bidirectional variable-flow controller ACDC10, the second Bidirectional variable-flow controller ACDC11, the 3rd Bidirectional variable-flow controller ACDC12, the equal cocoa of each Bidirectional variable-flow controller ACDC module is realized inversion (being DC → AC conversion) and rectification (being AC → DC conversion).Its characteristics possess super wide MPPT voltage range, the first Bidirectional variable-flow controller ACDC10, the second Bidirectional variable-flow controller ACDC11, the 3rd Bidirectional variable-flow controller ACDC12 respectively with the first main control module BMS4, the second main control module BMS5, when the 3rd main control module CMS6 coordinates, can exert oneself according to demanded power output and different energy storage carrier battery pack SOC automatic equalization, guarantee in unified energy storage carrier that the total run time in all crosstalks ponds reaches unanimity; Possess " peak load shifting ", " meritorious, idle control ", " low voltage crossing ", " islet operation " reach functions such as " failure loggings ", wherein the first Bidirectional variable-flow controller ACDC10, the second Bidirectional variable-flow controller ACDC11 also possess respectively lead-acid battery group 1, lithium battery group 2 current limlitings, limit power functions.Possess and show analog data that the respective battery management system uploads different energy storage carriers to background monitoring system 13, and accept and assign background monitoring system 13 instructions.
Battery management system part: mainly form from controlling module CM U9 and the first main control module BMS4, the second main control module BMS5, the 3rd main control module BMS6 etc. from control module BMU8, the 3rd from control module BMU7, second by first.Wherein, respectively be responsible for respectively the functions such as the monitoring such as lead-acid battery group 1, lithium battery group 2, super capacitance cell group 3 voltages, electric current, temperature and alarm and protection, electric quantity balancing from the control module, simultaneously institute's detection information reported each main control module by the CAN bus respectively.Each main control module is accepted respectively to report the information such as voltage, temperature, electric current from control mould card, and record discharges and recharges number of times, estimate simultaneously lead-acid battery group 1, lithium battery group 2, super capacitance cell group 3 dump energies (SOC), assess its health status (SOH) separately; Communicate by letter with background monitoring system 13 in addition, complete and upload lead-acid battery group 1, lithium battery group 2, super capacitance cell group 3 abnormality alarmings, the constant data in time between daily record data etc., and the operational order that background monitoring system 13 issues is passed to down respectively each main control module; Secondly communicate by letter with each Bidirectional variable-flow controller, complete and upload lead-acid battery group 1, lithium battery group 2, super capacitance cell group 3 abnormality alarmings, when the situation such as overvoltages, under-voltage, overcurrent and excess temperature occurs when lead-acid battery group 1 or lithium battery group 2 or super capacitance cell group 3, ask corresponding Bidirectional variable-flow controller to realize discharging and recharging power and control, and pass to corresponding main control module under the operational order that respectively the first Bidirectional variable-flow controller ACDC10, the second Bidirectional variable-flow controller ACDC11, the 3rd Bidirectional variable-flow controller ACDC12 is issued.
The background monitoring part: background monitoring system 13 communication modes adopt fiber optic Ethernet, have remote measurement, remote control, remote signaling function, energy storage carrier, battery management system, Bidirectional variable-flow control section and other corollary equipments etc. are carried out perfect monitoring comprehensively, detect in real time and can check relevant devices running status and running parameter etc.; And grade by long-range control command to the battery management system and Bidirectional variable-flow control part of assigning of background monitoring system 13.
Above-mentioned mixed energy storage system is made of three energy storage subsystems, and the first energy storage subsystem is comprised of from control module BMU7, the first main control module BMS4 and the first Bidirectional variable-flow controller ACDC10 etc. lead-acid battery group 1, first; The second energy storage subsystem is comprised of from control module BMU8, the second main control module BMS5 and the second Bidirectional variable-flow controller ACDC11 etc. lithium battery group 2, second; The 3rd energy storage subsystem is comprised of from control module BMS6 and the 3rd two-way exchange controller ACDC12 etc. super capacitance cell group 3, the 3rd main control module BMU9, the 3rd.Three energy storage subsystems pass through respectively the first two-way exchange controller ACDC10, the second two-way exchange controller ACDC11, the 3rd two-way exchange controller ACDC12 in its AC parallel connection, and dispatch by background monitoring system 13 and realize that three energy storage subsystems can independent operating, common operation can cooperatively interact again.
Above-mentioned mixed energy storage system is by background monitoring system 13 scheduling controlling, and by to power network monitoring and evaluates calculation, this mixed energy storage system controlling run strategy as shown in Figure 2.
When instantaneous power occurring and exceeding the target power scope, concrete charge and discharge process is: judge first whether each battery pack SOC reaches set point, as do not reach, each Bidirectional variable-flow is controlled it each battery pack is protected, and forbids discharge; If reach, at t 0Constantly, the second Bidirectional variable-flow controller ACDC11, the first Bidirectional variable-flow controller ACDC10 to lithium battery group, lead-acid battery group limit power, control the discharge of super capacitance cell group by the 3rd Bidirectional variable-flow controller ACDC12 respectively; Judge subsequently whether abnormal power recovers, as recovery, the 3rd energy storage subsystem stops discharge; As recovery, the super capacitance cell group continues discharge, at t iThe super capacitance cell group is discharged to its alarm voltage U constantly The c alarmThe time, the second Bidirectional variable-flow controller discharges lithium battery group output power limit, is discharged by the lithium battery group; Judge whether abnormal power recovers, as recovery, the lithium battery group stops discharge again; As not recovering, continue to discharge into t i+1Constantly, this moment, the super capacitance cell group discharged into its protection magnitude of voltage U The c protectionStop discharge, lithium ion battery continues discharge; To t I+2 constantlyThe lithium battery group discharges into the alarm voltage U The L alarm, the first Bidirectional variable-flow controller ACDC10 discharges lead-acid battery group output power limit, begins discharge by the lead-acid battery group; Judge again whether abnormal power recovers, as recovery, the first energy storage subsystem stops discharge; As not recovering, at t i+3Constantly, the lithium battery group is discharged to protection magnitude of voltage U The L protectionStop discharge, the lead-acid battery group continues discharge; To t i+4The lithium battery group is discharged to protection magnitude of voltage U constantly The L protectionStop discharge, whole mixed energy storage system discharge finishes.
From net the time, initial T 0Constantly calculate each battery pack SOC value, if do not reach set point each Bidirectional variable-flow controller is protected corresponding battery pack and forbidden discharging; If reach set point, second, third energy storage subsystem carries out output power limit to lithium battery group, lead-acid battery group, controls the super capacitance cell group by the 3rd Bidirectional variable-flow controller ACDC12 and discharges; Judge whether abnormal power recovers, as recovering, stop discharge; As not recovering, continue discharge, at T iConstantly, the super capacitance cell group discharges into the alarm voltage U The C alarm, the second Bidirectional variable-flow controller ACDC11 discharges lithium battery group output power limit, is discharged by the lithium battery group; Judge again whether abnormal power recovers, as recovering, stop discharge; As not recovering, at T i+1Super capacitance cell discharges into protection magnitude of voltage U constantly The c protectionStop discharge, the lithium battery group continues discharge; At T i+2The lithium battery group discharges into the alarm voltage U constantly The L alarm, the first Bidirectional variable-flow controller discharges lead-acid battery group output power limit, is discharged by the lead-acid battery group; Judge again whether abnormal power recovers, as recovering, stop discharge; As not replying, at T i+3The lithium battery group is discharged to protection magnitude of voltage U constantly The L protectionStop discharge, lead-acid battery continues discharge; At T i+4Lead-acid battery is discharged to the downscale protection voltage U constantly q Protection, stopping discharge, whole mixed energy storage system discharge finishes.

Claims (5)

1. a mixed energy storage system of controlling in order based on energy, is characterized in that, it comprises three energy storage subsystems:
The first energy storage subsystem comprises that lead-acid battery group, first is from control module BMU, the first main control module BMS and the first Bidirectional variable-flow controller ACDC, the lead-acid battery group is connected from control module BMU with being connected with the first Bidirectional variable-flow controller ACDC respectively, first is connected with the first main control module BMS from control module BMU, and the first main control module BMS is connected with background monitoring system;
The second energy storage subsystem comprises that lithium battery group, second is from control module BMU, the second main control module BMS and the second Bidirectional variable-flow controller ACDC, the lithium battery group is connected from control module BMU with being connected with the second Bidirectional variable-flow controller ACDC respectively, second is connected with the second main control module BMS from control module BMU, and the second main control module BMS is connected with background monitoring system;
The 3rd energy storage subsystem comprises that super capacitance cell group, the 3rd is from control module CM U, the 3rd main control module CMS and the 3rd Bidirectional variable-flow controller ACDC, the super capacitance cell group is connected from control module CM U with the 3rd with the 3rd Bidirectional variable-flow controller ACDC respectively, the 3rd is connected with the 3rd main control module CMS from control module CM U, and the 3rd main control module CMS is connected with background monitoring system;
Respectively be responsible for respectively lead-acid battery group, lithium ion battery group, voltage, electric current, monitoring temperature and the alarm and protection of super capacitance cell group, electric quantity balancing from the control module, simultaneously institute's detection information reported separately main control module by the CAN bus respectively; Each main control module is accepted the voltage, temperature, the current information that report, and record discharges and recharges number of times, estimates simultaneously lead-acid battery group, lithium battery group and super capacitance cell group remaining capacity SOC, assesses its health status SOH separately; Communicate by letter with background monitoring system in addition, complete upload lead-acid battery group, lithium battery group and super capacitance cell group abnormality alarming, constant data in time between the daily record data, and the operational order that background monitoring system issues is passed to down respectively each main control module; Each main control module is communicated by letter with separately Bidirectional variable-flow controller ACDC respectively, complete and upload lead-acid battery group, lithium battery group and super capacitance cell group abnormality alarming, when lead-acid battery group or lithium ion battery group or super capacitance cell group generation overvoltage, under-voltage, overcurrent and excess temperature situation, ask corresponding Bidirectional variable-flow controller ACDC to realize discharging and recharging power and control, and pass to corresponding main control module under the operational order that respectively each Bidirectional variable-flow controller ACDC is issued.
2. as claimed in claim 1 based on the orderly mixed energy storage system of controlling of energy, it is characterized in that, be incorporated into the power networks and operation of power networks when normal, each main control module and from the control module by to the detection of each battery voltage, temperature, electric current, assess three energy storage subsystem remaining capacity SOC, and upload the data to Bidirectional variable-flow controller part, the Bidirectional variable-flow controller is by judgement, as the need charging, each battery pack is charged; As not charging, duty is pressed the float charge voltage charging;
When electrical network because of renewable generation of electricity by new energy or load electricity consumption initial t 0When constantly instantaneous power occurring and exceeding the target power scope, by different energy storage subsystem SOC being detected assessment and controlling, judgement is also controlled in order by super capacitance cell group → lithium ion battery group → lead-acid battery group energy and is utilized principle, whether decision discharges to electrical network, the target power value range occurs exceeding with effectively level and smooth electrical network, realize " peak load shifting ".
3. as claimed in claim 1 based on the orderly mixed energy storage system of controlling of energy, it is characterized in that, from network operation the time, at first by each main control module with detect different battery pack remaining capacity SOC and report each Bidirectional variable-flow controller and background monitoring system from the control module, control each Bidirectional variable-flow controller by background monitoring system, according to different battery pack state-of-charge SOC, judgement also utilizes principle to realize whether network load is powered by controlling in order by super capacitance cell group → lithium ion battery group → lead-acid battery group energy; Simultaneously; after the super capacitance cell group is being discharged and is being protected by the 3rd main control module CMS, the 3rd Bidirectional variable-flow controller ACDC; give the 3rd subsystem charging by the second energy storage subsystem, the first energy storage subsystem successively; at this moment; the 3rd Bidirectional variable-flow controller ACDC controls the 3rd subsystem power output, is mainly powered to network load by the second energy storage subsystem, the first energy storage subsystem successively thereafter.
4. as claimed in claim 2 based on the orderly mixed energy storage system of controlling of energy, it is characterized in that, when the appearance instantaneous power exceeds the target power scope, concrete charge and discharge process is: judge first whether each battery pack SOC reaches set point, as do not reach, each Bidirectional variable-flow is controlled it each battery pack is protected, and forbids discharge; If reach, at t 0Constantly, the second Bidirectional variable-flow controller ACDC, the first Bidirectional variable-flow controller ACDC to lithium battery group, lead-acid battery group limit power, control the discharge of super capacitance cell group by the 3rd Bidirectional variable-flow controller ACDC respectively; Judge subsequently whether abnormal power recovers, as recovery, the 3rd energy storage subsystem stops discharge; As recovery, the super capacitance cell group continues discharge, at t iThe super capacitance cell group is discharged to its alarm voltage U constantly The c alarmThe time, the second Bidirectional variable-flow controller discharges lithium battery group output power limit, is discharged by the lithium battery group; Judge whether abnormal power recovers, as recovery, the lithium battery group stops discharge again; As not recovering, continue to discharge into t i+1Constantly, this moment, the super capacitance cell group discharged into its protection magnitude of voltage U The c protectionStop discharge, lithium ion battery continues discharge; To t I+2 constantlyThe lithium battery group discharges into the alarm voltage U The L alarm, the first Bidirectional variable-flow controller ACDC discharges lead-acid battery group output power limit, begins discharge by the lead-acid battery group; Judge again whether abnormal power recovers, as recovery, the first energy storage subsystem stops discharge; As not recovering, at t i+3Constantly, the lithium battery group is discharged to protection magnitude of voltage U The L protectionStop discharge, the lead-acid battery group continues discharge; To t i+4The lithium battery group is discharged to protection magnitude of voltage U constantly The L protectionStop discharge, whole mixed energy storage system discharge finishes.
5. the mixed energy storage system of controlling in order based on energy as claimed in claim 3, is characterized in that, from net the time, and initial T 0Constantly calculate each battery pack SOC value, if do not reach set point each Bidirectional variable-flow controller is protected corresponding battery pack and forbidden discharging; If reach set point, second, third energy storage subsystem carries out output power limit to lithium battery group, lead-acid battery group, controls the super capacitance cell group by the 3rd Bidirectional variable-flow controller ACDC and discharges; Judge whether abnormal power recovers, as recovering, stop discharge; As not recovering, continue discharge, at T iConstantly, the super capacitance cell group discharges into the alarm voltage U The C alarm, the second Bidirectional variable-flow controller ACDC discharges lithium battery group output power limit, is discharged by the lithium battery group; Judge again whether abnormal power recovers, as recovering, stop discharge; As not recovering, at T i+1Super capacitance cell discharges into protection magnitude of voltage U constantly The c protectionStop discharge, the lithium battery group continues discharge; At T i+2The lithium battery group discharges into the alarm voltage U constantly L Alarm, the first Bidirectional variable-flow controller discharges lead-acid battery group output power limit, is discharged by the lead-acid battery group; Judge again whether abnormal power recovers, as recovering, stop discharge; As not replying, at T i+3The lithium battery group is discharged to protection magnitude of voltage U constantly The L protectionStop discharge, lead-acid battery continues discharge; At T i+4Lead-acid battery is discharged to the downscale protection voltage U constantly The q protection, stopping discharge, whole mixed energy storage system discharge finishes.
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