CN107809117A - City rail traffic ground lithium ion battery energy storage system control method based on PI rings regulation discharge threshold - Google Patents
City rail traffic ground lithium ion battery energy storage system control method based on PI rings regulation discharge threshold Download PDFInfo
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- CN107809117A CN107809117A CN201710893915.3A CN201710893915A CN107809117A CN 107809117 A CN107809117 A CN 107809117A CN 201710893915 A CN201710893915 A CN 201710893915A CN 107809117 A CN107809117 A CN 107809117A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
A kind of city rail traffic ground lithium ion battery energy storage system control method based on PI rings regulation discharge threshold in being controlled the present invention relates to urban track traffic.This method is to calculate to obtain net compacting border discharge threshold first；When train traction, Traction networks net pressure is fallen, when net pressure falls to below discharge threshold voltage, connection Traction networks and the high power D C/DC devices of lithium battery energy storage battery system enter discharge voltage ring, lithium battery energy storage battery system discharge is maintained supply conductor voltage near discharge threshold voltage；When train braking, Traction networks net presses lifting, when net pressure is risen on charge threshold, connection Traction networks and the high power D C/DC devices of lithium battery energy storage battery system enter charging voltage ring, make the charging of lithium battery energy storage battery system by Traction networks net work voltage stable near charge threshold.The present invention solves existing SOC offset problems caused by determining threshold value control, lithium battery energy storage battery system is operated near the SOC value of its power maximum point.
Description
Technical field
The present invention relates to urban track traffic power-saving technology, specifically a kind of urban rail based on PI rings regulation discharge threshold is handed over
Logical ground lithium ion battery energy storage system control method.
Background technology
With the development of city rail traffic, also rapid growth, the energy-saving run of municipal rail train have become one urgently to its power consumption
The problem of to be solved.Municipal rail train is typically driven using alternating current generator, and when train braking, motor can be with generator mode work
Make, the mechanical energy transfer that train is moved is electric energy.This mode of braking is referred to as regenerative braking.Due to urban rail traction substation
Using the rectifier system of uncontrollable rectifier, electric energy caused by regenerative braking can not by traction substation loopback AC network, so
Present most of trains all fall this portion of energy using resistive dissipation.The regeneration energy absorbing device of resistive dissipation formula not only increases
The weight of train can also bring serious heat dissipation problem.
The battery of high power density disclosure satisfy that the application demand of city rail traffic, and the appearance of lithium titanate battery causes lithium ion
Battery applications are possibly realized in field of track traffic.The energy density of lithium titanate battery is less than conventional ferric phosphate lithium cell or three
First lithium battery, but its power density be significantly larger than it is above-mentioned both.And lithium titanate battery cycle life is full full of situation about putting
It is lower typically also to reach more than 1.5 ten thousand times, applied in city rail traffic field during absorption train regenerating braking energy, train braking
And caused lithium battery energy storage battery system SOC changes are drawn once typically within 0.05.Worked under this depth of discharge
Its cycle life of lithium titanate battery energy-storage system can also reach service life requirement.
The content of the invention
The technical problem to be solved by the invention is to provide a kind of city rail traffic ground based on PI rings regulation discharge threshold
Lithium ion battery energy storage system control method, solve existing SOC offset problems caused by determining threshold value control, and lithium can be made
Battery energy storage system is operated near the SOC value of its power maximum point.
The city rail traffic ground lithium ion battery energy storage system control method based on PI rings regulation discharge threshold of the present invention
For：
The state parameter of lithium battery energy storage battery system and Traction networks is transmitted by voltage detection module and current detection module
To computing and control module；It is current that computing and control module using double Kalman filtering algorithms estimate lithium battery energy storage battery system
SOC value and Equivalent DC internal resistance value, and opening when calculating lithium battery energy storage battery system power maximum according to Equivalent DC internal resistance value
Road magnitude of voltage；With the magnitude of voltage and known lithium battery energy storage battery system SOC-OCV curve ratios compared with SOC when obtaining power maximum
Value；The SOC value is obtained into SOC reference values plus a departure, the value of the departure is that SOC caused by train braking is fluctuated
Half, can between 0.02~0.03 value；The actual soc-value that SOC reference values obtain with double Kalman filtering algorithms makees ratio
SOC differences are relatively obtained, difference progress PI is adjusted to obtain the correction of discharge threshold；By the correction and original discharge threshold
Addition obtains actual discharge threshold value；
When train traction, Traction networks net pressure is fallen, when net pressure falls to below discharge threshold voltage, connection Traction networks with
The high power D C/DC devices of lithium battery energy storage battery system enter discharge voltage ring, make lithium battery energy storage battery system discharge by Traction networks electricity
Pressure is maintained near discharge threshold voltage；
When train braking, the pressure lifting of Traction networks net, when net pressure is risen on charge threshold, connection Traction networks and lithium electricity
The high power D C/DC devices of pond energy-storage system enter charging voltage ring, the charging of lithium battery energy storage battery system is pressed Traction networks net steady
It is scheduled near charge threshold.
Preferably, SOC control rings, charging voltage ring, the parameter of discharge voltage ring are inputted by human-computer interaction module.
Preferably, the initial value of discharge voltage threshold value and charging voltage threshold value are also given by human-computer interaction module.
Preferably, human-computer interaction module also shows whether the retaking of a year or grade value of all command values is effectively assigned with determine instruction value
Value.
Preferably, the management system (BMS) of battery energy storage system is led to computing with control module with can communication protocols
Letter, computing are communicated with control module with human-computer interaction module with 485 communication modes, and final human-computer interaction module can be shown
Parameter inside battery energy storage system.
The present invention compared with prior art, has an advantageous effect in that：Because present invention employs the filter of double spreading kalmans
Ripple device so that it is higher to the SOC estimation precision of lithium battery group, and battery pack equivalent internal resistance can be estimated, so as to obtain
The SOH of battery pack.Maximum work has been calculated as a result of dynamic discharge Hedging Point Control, and by battery pack equivalent internal resistance
The SOC value of rate point, this programme can control battery pack be operated in maximum power point nearby so as to prevent lithium battery energy storage battery system because
Overcharge or cross caused by SOC skews and put and reduce the danger of battery overload.
Brief description of the drawings
Fig. 1 is the structured flowchart of city rail traffic ground lithium battery energy storage battery system reclaiming energy；
Equivalent structure block diagram when Fig. 2 is city rail traffic ground lithium battery energy storage battery system absorption and regeneration energy；
Equivalent structure block diagram when Fig. 3 is city rail traffic ground lithium battery energy storage battery system release regeneration energy；
Fig. 4 is Control system architecture block diagram；
Fig. 5 is maximum power point SOC value calculation flow chart；
Fig. 6 is SOC model- following control block diagrams.
Embodiment
Technical solution of the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 show the wiring diagram of city rail traffic ground lithium ion battery energy storage system.The storage being made up of lithium titanate battery
Energy system is connected by two-way DC/DC devices with dc bus, and two-way DC/DC devices have two IGBT switching tubes K1 and K2.
In Fig. 1 during train braking, the voltage sample module in Fig. 4 detect busbar voltage raise, when voltage be increased to by
During the charging voltage threshold value that human-computer interaction interface is set, computing sends pwm signal with control unit.Now switching tube K2 is closed,
Equivalent circuit is as shown in Fig. 2 now DC/DC is in BUCK patterns, by the energy storage of train braking to battery energy storage system.
Control process caused by PWM ripples is as shown in fig. 6, busbar voltage information is transferred to computing and control by the voltage sample module in Fig. 4
Voltage actual value is obtained the reference value of battery current by unit processed, computing with control unit compared with battery charging curve.
The actual current value of battery is sent to computing and control module by current sample module in Fig. 4, and computing and control module are by electricity
Stream reference value makes the difference with actual value and adjusts to obtain modulated signal by PI.The modulated signal is relatively controlled with triangular carrier
The PWM ripples of IGBT switching tubes.
In Fig. 1 during train traction, voltage sample module detects busbar voltage reduction in Fig. 4, when voltage is reduced to electric discharge
Computing sends pwm signal with control unit during voltage threshold.Now switching tube K1 is closed, and equivalent circuit is as shown in figure 3, now double
BOOST patterns are in DC/DC, the energy stored in battery energy storage system is discharged into burning voltage.Busbar voltage is discharged
The generation of threshold value is as shown in Figure 5.Voltage in Fig. 4 sends out the voltage of battery energy storage system and current data with current sample module
Give computing and control unit.Computing and control unit using double extended Kalman filters to the SOC of battery energy storage system with
Equivalent DC internal resistance carries out joint estimate.Battery energy storage system power maximum point is calculated in the Equivalent DC internal resistance by estimating
Open-circuit voltage values.The open-circuit voltage values and known open-circuit voltage and SOC relation curves are compared, obtain power maximum point
SOC value.Because the power of lithium battery can decline rapidly after SOC exceedes maximum power point, so needing to reserve certain abundant
Amount prevents SOC from exceeding maximum power point.This allowance can be the SOC value corresponding to the half of train regenerating braking energy.Will be by transporting
Calculation subtracts allowance with the maximum power point SOC value that control unit is calculated and obtains final SOC reference values.As shown in Figure 6 will
The reference value makes the difference with the SOC actual values that double expanded Kalman filtration algorithms obtain in Fig. 5 and is adjusted to one through pi regulator
The correction of discharge threshold, the correction is added to obtain battery energy storage system under current SOC value with initially putting a little offline value
Discharge threshold.The discharge threshold and busbar voltage actual value make difference and simultaneously reconcile to obtain control PWM modulating wave through PI, finally with three
Angle carrier wave ratio is compared with the PWM ripples for obtaining controlling IGBT switching tubes.
Claims (5)
1. a kind of city rail traffic ground lithium ion battery energy storage system control method based on PI rings regulation discharge threshold, its feature
It is：
The state parameter of lithium battery energy storage battery system and Traction networks is transferred to by fortune by voltage detection module and current detection module
Calculation and control module；
Computing and control module using double Kalman filtering algorithms estimate the current SOC value of lithium battery energy storage battery system with it is equivalent straight
Open-circuit voltage values when flowing internal resistance value, and calculating according to Equivalent DC internal resistance value lithium battery energy storage battery system power maximum；
With the magnitude of voltage and known lithium battery energy storage battery system SOC-OCV curve ratios compared with SOC value when obtaining power maximum；
The SOC value is obtained into SOC reference values plus a departure, the value of the departure is SOC ripples caused by train braking
Dynamic half；The actual soc-value that SOC reference values obtain with double Kalman filtering algorithms makes comparisons to obtain SOC differences, by the difference
PI is carried out to adjust to obtain the correction of discharge threshold；The correction is added with original discharge threshold to obtain actual discharge threshold value；
When train traction, Traction networks net pressure is fallen, when net pressure falls to below discharge threshold voltage, connection Traction networks and lithium electricity
The high power D C/DC devices of pond energy-storage system enter discharge voltage ring, lithium battery energy storage battery system discharge is tieed up supply conductor voltage
Hold near discharge threshold voltage；
When train braking, the pressure lifting of Traction networks net, when net pressure is risen on charge threshold, connection Traction networks store up with lithium battery
The high power D C/DC devices of energy system enter charging voltage ring, make the charging of lithium battery energy storage battery system that Traction networks net work voltage stable to exist
Near charge threshold.
2. the city rail traffic ground lithium ion battery energy storage system according to claim 1 based on PI rings regulation discharge threshold
Control method, it is characterized in that：SOC control rings, charging voltage ring, the parameter of discharge voltage ring are inputted by human-computer interaction module.
3. the city rail traffic ground lithium ion battery energy storage system according to claim 1 based on PI rings regulation discharge threshold
Control method, it is characterized in that：The initial value and charging voltage threshold value of discharge voltage threshold value are also given by human-computer interaction module.
4. the city rail traffic ground lithium ion battery energy storage system according to claim 1 based on PI rings regulation discharge threshold
Control method, it is characterized in that：Human-computer interaction module also shows whether the retaking of a year or grade value of all command values is effective with determine instruction value
Assignment.
5. the city rail traffic ground lithium ion battery energy storage system according to claim 1 based on PI rings regulation discharge threshold
Control method, it is characterized in that：The management system of battery energy storage system is led to computing with control module with can communication protocols
Letter, computing are communicated with control module with human-computer interaction module with 485 communication modes, and final human-computer interaction module can be shown
Parameter inside battery energy storage system.
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| CN201710893915.3A CN107809117B (en) | 2017-09-28 | 2017-09-28 | The city rail traffic energy storage system control method of discharge threshold is adjusted based on PI ring |
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| CN201710893915.3A CN107809117B (en) | 2017-09-28 | 2017-09-28 | The city rail traffic energy storage system control method of discharge threshold is adjusted based on PI ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109703418A (en) * | 2019-02-13 | 2019-05-03 | 盾石磁能科技有限责任公司 | The system and method for solving the problems, such as rail potential with energy storage device |
| CN112994157A (en) * | 2021-03-01 | 2021-06-18 | 株洲中车时代电气股份有限公司 | Self-adaptive bidirectional DCDC (direct current) charge and discharge control method and device |
| CN114030360A (en) * | 2022-01-10 | 2022-02-11 | 北京和利时系统工程有限公司 | Train operation control method and system |
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| CN109703418A (en) * | 2019-02-13 | 2019-05-03 | 盾石磁能科技有限责任公司 | The system and method for solving the problems, such as rail potential with energy storage device |
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| CN112994157A (en) * | 2021-03-01 | 2021-06-18 | 株洲中车时代电气股份有限公司 | Self-adaptive bidirectional DCDC (direct current) charge and discharge control method and device |
| CN114030360A (en) * | 2022-01-10 | 2022-02-11 | 北京和利时系统工程有限公司 | Train operation control method and system |
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