CN109991544A - A kind of topological structure and control method of novel online long-range contordled capacity experiment - Google Patents
A kind of topological structure and control method of novel online long-range contordled capacity experiment Download PDFInfo
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Abstract
The invention belongs to battery group management system technical fields, more particularly to a kind of topological structure and control method of novel online long-range contordled capacity experiment.The present invention is equipped with collection cell batteries parameter acquisition subsystem, battery analysis and computing subsystem, the overall battery management system for monitoring master system and being integrated；It is that data collection DAQ module is connected by battery pack, DAQ module connects microprocessor by CAN bus, then connect with host computer；DAQ module obtains battery unit data, and passes to microprocessor；Microprocessor implements the analytical calculation of battery group verification property capacity test, and battery state is transferred to host computer.The present invention has the function of remote operation, saves cost, and energy conservation has powerful incident response ability.Core holds process battery group and is connected always with DC bus, there is stronger accident resilience.If accident occurs when core holds, battery group may continue to power.
Description
Technical field
The invention belongs to battery group management system technical fields, more particularly to a kind of novel online remote core is to property capacity
The topological structure and control method of test.
Background technique
Transforming plant DC power-supply system is the important component of transformer station secondary system, is relay protection, safety automation
The basis that device and automation equipment are worked normally and correctly acted, thus maintain DC power system stable operation seem to
It closes important.
Valve-control type lead-acid accumulator, hereinafter referred to as battery.As the most common backup power supply in transforming plant DC power supply, directly
Connect the powerup issue of DC load after being related to accident.Contordled capacity experiment, hereinafter referred to as core periodically are carried out to battery group
Hold, is the highly effective and common technological means for checking accumulator property.According to regulatory requirements, group storage battery verification property is put
The electric test time is 10 hours, and discharge current is very big, in order to make core hold work safety, good completion, needs to run dimension
Shield personnel guard always at the scene.This seed nucleus appearance method is waiting for a long time, and complicated for operation, electric current is big, it is often more important that it can band
Carry out very big security risk.
Summary of the invention
For above-mentioned substation in the prior art, core holds the problems tested at this stage, and the invention proposes a kind of novel
The topological structure and control method of online long-range contordled capacity experiment.It is a kind of based on new topology knot its purpose is to provide
Structure and control method are, it can be achieved that online remote core is held, and saving material is energy saving, and the control method that accident resilience is superpower.
In order to achieve the above-mentioned object of the invention, the present invention is achieved through the following technical solutions:
A kind of topological structure of novel online long-range contordled capacity experiment, is equipped with collection cell batteries parameter acquisition subsystem
System, battery analysis and computing subsystem, the overall battery management system for monitoring master system and being integrated；It is to be connected by battery pack
Data collection DAQ module, DAQ module connects microprocessor by CAN bus, then connect with host computer；DAQ module obtains battery
Cell data, and pass to microprocessor；Microprocessor implements the analytical calculation of battery group verification property capacity test, and will be electric
Pond group state is transferred to host computer；
Using the control method of the topological structure of the novel online long-range contordled capacity experiment of described one kind, including it is following
Working condition: normal condition；Accident condition；Core holds state；During holding test accident occurs for core.
The normal condition: system works in normal condition, and DC load is powered by converter, at this point, pwm converter is made
It is rectifier to provide stable voltage to DC bus；Battery pack is in normal charging condition, floating charge state is in after being full of, only
There is the electric current of very little to flow through battery pack.
The accident condition: when system jam, converter can not be load supplying, it is necessary to disconnect transformation
The breaker and DC bus of device；In this stage, load by battery-powered.
The core holds state: when online remote core receiving electric test carries out, battery group must be discharged with constant current,
It powers to the load simultaneously；And capacity checks that discharge current will be greater than load-side electric current；Therefore, which will pass through two-way changing
Device feeds back to power grid.
During holding test accident occurs for the core: if holding test converter failure when carrying out, electric power storage in line core
Pond group powering load holds test in line core and forces to stop.
The online remote core receives electric test, controls target are as follows:
(1) no matter load and how to change, battery pack is all discharged with constant current, to meet the requirement that core holds test；
(2) ac-side current is connected to the grid with unity power factor；
(3) ac-side current harmonic wave is smaller, meets grid-connected requirement.
The topological structure of the novel online long-range contordled capacity experiment of described one kind is used based on battery group electric discharge electricity
Flow the control strategy of outer ring and grid-connected current inner ring, wherein ia, ib, icIndicate power network current；id, iqIt is ia, ib, icIt becomes through dq
Value after changing；ua, ub, ucIt is the voltage of power grid；ud, uqIt is ua, ub, ucThe transformed voltage of dq；id *, iq *It is id, iqGinseng
It examines；uam, ubm, ucmIt is ua, ub, ucModulated signal；ibatIt is the electric current of battery group；S is the control signal of switch, and θ indicates dq
The angle signal of rotatable coordinate axis；
Using twin nuclei:
(1) battery power discharge electric current outer ring: because battery group must be discharged with constant current；Therefore discharge current control is added
It is added to outer ring；PI controller is for controlling discharge current and being not in static error；Since battery pack can provide direct current mother
The voltage support of line, therefore the voltage stabilization of DC bus is in a certain range, therefore does not need control DC bus-bar voltage；
(2) power network current inner ring: inner ring includes watt current idWith reactive current iqRing；The detected value i of grid-connected currenta,
ib, icThe i being converted into synchronous rotating framedWith iq；Again by the i in coordinate systemd, iqWith given current reference id*, iq *
It is compared；And corresponding PI controller is controlled to realize to id, iqZero steady state error control；To the output signal of PI controller
Anti- dq transformation is carried out, a, b are obtained, c threephase switch modulates reference signal wave uam, ubm, ucm, and obtained by SPWM or SVPWM modulation
The simultaneously corresponding switching drive signal of network switch is obtained, to realize the closed-loop control of converter.
The topological structure of the novel online long-range contordled capacity experiment of described one kind, is adopted equipped with collection cell batteries parameter
Subsystem, battery analysis and computing subsystem, the overall battery management system for monitoring master system and being integrated, single battery
It is acquired and calculates respectively by DAQ module and microprocessor module, then communicate with host computer and complete integral monitoring；Root
The qualified judgement of battery group is carried out according to the acceptable criterion that battery group core holds；
It is implemented as follows:
(1) Usage data collection DAQ module collects the data of battery pack, including electric discharge with sample frequency appropriate and precision
Electric current, voltage and temperature；
(2) data collected are sent to microcomputer module, microcomputer module include online parameter identification module and
Shape
State viewer；
(3) in parameter identification module, battery dynamic naive model has been used, has identified battery using input/output data
Parameter；Then the battery model parameter feedback of update is estimated to the SOC and SOH of battery to state observer；
(4) state observer uses the OCV of polynomial equations project battery, open-circuit voltage；Then the OCV of prediction is used
In the end voltage of calculating battery, and the end voltage of calculating is compared with actual cell voltage；Then using calculating and real
Error between the cell voltage of border calculates the filter gain in Kalman filter with more new state SOC；
(5) signal of needs is sent to host computer by communication module by treated in above system signal, passed through
Host computer carries out overall monitoring；
After host computer obtains the status information of battery group, need to assess it to determine whether battery is qualified,
The residual capacity of battery is calculated according to following formula,
In above formula: t0Refer to the discharge time of battery unit；When calculating cell capacity CcellWhen, it is strong to assess it
Health situation, i0Indicate instant discharge current；
The health status SOH of other batteries accounts for the percentage of rated capacity according to actual capacity to define；Calculate the public affairs of SOH
Formula is as follows,
In above formula: the rated capacity of Cnominal expression battery；
When the discharge capacity of battery group is greater than 80% rated capacity, 1.8V, battery group is still greater than in discharge voltage
Capacity is qualified, and battery works on.
The present invention have the advantages that with and the utility model has the advantages that
(1) has the function of remote operation.All parameters all remotely obtain, can be with On-line Control and analysis；
(2) cost is saved.Battery group can be charged and discharged only by a device；And do not increase new core
Appearance machine is realized, so that it is more saved material；
(3) energy saving.The discharge energy of battery is absorbed by power grid, core discharge capacitor energy feedback to power grid, does not cause energy unrestrained
Take.
(4) there is powerful incident response ability.Core holds process battery group and is connected always with DC bus, has stronger
Accident resilience.If accident occurs when core holds, battery group may continue to power.
Detailed description of the invention
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawing and specific embodiment
The present invention is described in further detail, it is to be understood that protection scope of the present invention is not by the limit of specific embodiment
System.
Fig. 1 is that online remote core of the invention holds electric hookup；
Fig. 2 is 1 figure of the method for the present invention working condition；
Fig. 3 is the method for the present invention working condition 2,4 figures；
Fig. 4 is 3 figure of the method for the present invention working condition；
The control strategy figure that Fig. 5 present invention holds in line core；
Fig. 6 is the monitoring communication construction that the present invention holds system in line core.
Specific embodiment
The topological structure and control method that the present invention is the novel online long-range contordled capacity experiment of one kind are, it can be achieved that long-range
, online savings resource and the battery group contordled capacity experiment with failure resistivity.
Topological structure:
Wherein, the online remote core of base holds working principle as shown in Figure 1, Fig. 1 is the electricity that online remote core of the invention holds method
Gas wiring diagram.
Traditional three-phase rectifier is replaced by the two-way pwm converter of three-phase, shown in dotted line.Pwm converter is by filtered electrical
Sensor, electronic power switch and direct current capacitors composition.Filter inductance is for filtering out high-frequency harmonic caused by switch motion.Electric power
Electronic switch has bi directional conductibility ability, can be IGBT and connects anti-parallel diodes.Direct current capacitors connects at DC bus,
To establish stable DC bus-bar voltage.Battery group positive and negative anodes connect on DC bus.Load positive and negative anodes also connect in direct current mother
On line.Pwm converter exchange flanks three-phase AC grid.
The present invention holds the communication construction of system in line core, requires to need acquisition meter in real time for the control that online remote core is held
Calculate the parameter of battery group.Therefore need to design a set of collection cell batteries parameter acquisition subsystem, battery analysis and calculating subsystem
System, the overall battery management system for monitoring master system and being integrated, as shown in Figure 6.Battery pack connects data collection DAQ mould
Block.DAQ module connects microprocessor by CAN bus, then connect with host computer.DAQ module obtains battery unit data, and passes
Pass microprocessor.Microprocessor implements the analytical calculation of battery group verification property capacity test, and battery state is transmitted
To host computer.
Control method:
A kind of topological structure of novel online long-range contordled capacity experiment of the invention includes four kinds of working conditions:
As shown in Fig. 2, Fig. 2 is 1 figure of the method for the present invention working condition.
Situation 1: normal condition.System works in normal condition, and DC load is powered by converter.At this point, pwm converter
As rectifier to provide stable voltage to DC bus.Battery pack is in normal charging condition, and floating charge state is in after being full of,
The electric current of only very little flows through battery pack.
As shown in figure 3, Fig. 3 is the method for the present invention working condition 2,4 figures.
Situation 2: accident condition.When system jam, converter can not be load supplying.It has to be off and is connected to change
The breaker and DC bus of parallel operation.In this stage, load by battery-powered.
As shown in figure 4, Fig. 4 is 3 figure of the method for the present invention working condition.
Situation 3: core holds state.When line core holds test progress, battery group must be discharged with constant current, while to
Load supplying.And under normal circumstances, capacity checks that discharge current will be greater than load-side electric current.Therefore, which will be by double
Power grid is fed back to converter.
Situation 4: during holding test accident occurs for core.If online remote core receiving electric test carries out, time-varying is being carried out
Parallel operation breaks down, and battery group should be only to need powering load, and holding test in line core should force to stop.Therefore, circuit at this time
Condition is identical as condition 2.
Remote core online for the battery group of situation 3 receives electric test, and control target can be described as:
(1) no matter load and how to change, battery pack is all discharged with constant current, to meet the requirement that core holds test；
(2) ac-side current is connected to the grid with unity power factor；
(3) ac-side current harmonic wave is smaller, meets grid-connected requirement.
Based on above-mentioned target, the present invention a kind of topological structure and control method of novel online long-range contordled capacity experiment
Using the control strategy based on battery group discharge current outer ring and grid-connected current inner ring, as shown in Figure 5.In figure, ia, ib, icTable
Show power network current；id, iqIt is ia, ib, icIt is through the transformed value of dq；ua, ub, ucIt is the voltage of power grid；ud, uqIt is ua, ub, uc's
The transformed voltage of dq.id *, iq *It is id, iqReference.uam, ubm, ucmIt is ua, ub, ucModulated signal；ibatIt is battery group
Electric current.S is the control signal of switch, and θ indicates the angle signal of dq rotatable coordinate axis.
Using twin nuclei:
(1) battery power discharge electric current outer ring: because battery group must be discharged with constant current.Therefore discharge current control is added
It is added to outer ring.PI controller can be used for controlling discharge current and be not in static error.Since battery pack can provide direct current
The voltage support of bus, therefore the voltage of DC bus can be stablized in a certain range, therefore not need control DC bus
Voltage.
(2) power network current inner ring: inner ring includes watt current idWith reactive current iqRing.The detected value i of grid-connected currenta,
ib, icThe i being converted into synchronous rotating framedWith iq.Again by the i in coordinate systemd, iqWith given current reference id*, iq *
It is compared.And corresponding PI controller is controlled to realize to id, iqZero steady state error control.To the output signal of PI controller
Anti- dq transformation is carried out, a, b are obtained, c threephase switch modulates reference signal wave uam, ubm, ucm, and obtained by SPWM or SVPWM modulation
The simultaneously corresponding switching drive signal of network switch is obtained, so as to realize the closed-loop control of converter.
Embodiment 1:
In order to complete the line closed loop control of battery group, the quality of battery group is assessed, is needed to all of battery group
Multi-parameter carries out real-time management.Therefore need to design a set of collection cell batteries parameter acquisition subsystem, battery analysis and calculating
System, the overall battery management system for monitoring master system and being integrated, as shown in Figure 6.Single battery passes through DAQ module and micro-
Processor module is acquired and calculates respectively, then communicate with host computer and complete integral monitoring.Held according to battery group core
Acceptable criterion carry out the qualified judgement of battery group.
It is implemented as follows:
(1) Usage data collection DAQ module collects the data of battery pack, including electric discharge with sample frequency appropriate and precision
Electric current, voltage and temperature.
(2) data collected are sent to microcomputer module, microcomputer module include online parameter identification module and
Shape
State viewer.
(3) in parameter identification module, battery dynamic naive model has been used, has identified battery using input/output data
Parameter；Then the battery model parameter feedback of update is estimated to the SOC and SOH of battery to state observer.
(4) state observer uses the OCV of polynomial equations project battery, open-circuit voltage.Then the OCV of prediction is used
In the end voltage of calculating battery, and the end voltage of calculating is compared with actual cell voltage.Then using calculating and real
Error between the cell voltage of border calculates the filter gain in Kalman filter with more new state SOC.
(5) signal of needs is sent to host computer by communication module by treated in above system signal, passed through
Host computer carries out overall monitoring.
After host computer obtains the status information of battery group, need to assess it to determine whether battery is qualified,
The residual capacity of battery is calculated according to following formula,
In above formula: t0Refer to the discharge time of battery unit.When calculating cell capacity CcellWhen, it can be estimated that
Its health status, i0Indicate instant discharge current.
The health status SOH of other batteries accounts for the percentage of rated capacity according to actual capacity to define.Calculate the public affairs of SOH
Formula is as follows,
In above formula: the rated capacity of Cnominal expression battery.
When the discharge capacity of battery group is greater than 80% rated capacity, 1.8V is still greater than in discharge voltage, it is believed that
Battery group capacity is qualified, and battery can work on.
Claims (8)
1. a kind of topological structure of novel online long-range contordled capacity experiment, it is characterized in that: being equipped with collection cell batteries parameter
Acquisition subsystem, battery analysis and computing subsystem, the overall battery management system for monitoring master system and being integrated；It is by electricity
Pond group connects data collection DAQ module, and DAQ module connects microprocessor by CAN bus, then connect with host computer；DAQ module
Battery unit data are obtained, and pass to microprocessor；Microprocessor implements the analysis meter of battery group verification property capacity test
It calculates, and battery state is transferred to host computer；
Utilize the control method of the topological structure of the novel online long-range contordled capacity experiment of one kind, including following work
State: normal condition；Accident condition；Core holds state；During holding test accident occurs for core.
2. the topological structure of the novel online long-range contordled capacity experiment of one kind according to claim 1, it is characterized in that: institute
State normal condition: system work in normal condition, DC load is powered by converter, at this point, pwm converter as rectifier with
Stable voltage is provided to DC bus；Battery pack is in normal charging condition, and floating charge state, the only electricity of very little are in after being full of
Stream flows through battery pack.
3. the topological structure of the novel online long-range contordled capacity experiment of one kind according to claim 1, it is characterized in that: institute
State accident condition: when system jam, converter can not be load supplying, it is necessary to disconnect the breaker of converter
And DC bus；In this stage, load by battery-powered.
4. the topological structure of the novel online long-range contordled capacity experiment of one kind according to claim 1, it is characterized in that: institute
State core and hold state: when online remote core receiving electric test carries out, battery group must be discharged with constant current, while to load
Power supply；And capacity checks that discharge current will be greater than load-side electric current；Therefore, which will be fed back by reversible transducer and be wired back
Net.
5. the topological structure of the novel online long-range contordled capacity experiment of one kind according to claim 1, it is characterized in that: institute
State during core holds test and accident occurs: if holding test converter failure when carrying out in line core, battery group is only given negative
Power supply is carried, holds test in line core and forces to stop.
6. the topological structure of the novel online long-range contordled capacity experiment of one kind according to claim 4, it is characterized in that: institute
Online remote core receiving electric test is stated, target is controlled are as follows:
(1) no matter load and how to change, battery pack is all discharged with constant current, to meet the requirement that core holds test；
(2) ac-side current is connected to the grid with unity power factor；
(3) ac-side current harmonic wave is smaller, meets grid-connected requirement.
7. the topological structure of the novel online long-range contordled capacity experiment of one kind according to claim 1, it is characterized in that: adopting
With the control strategy based on battery group discharge current outer ring and grid-connected current inner ring, wherein ia, ib, icIndicate power network current；
id, iqIt is ia, ib, icIt is through the transformed value of dq；ua, ub, ucIt is the voltage of power grid；ud, uqIt is ua, ub, ucDq it is transformed
Voltage；id *, iq *It is id, iqReference；uam, ubm, ucmIt is ua, ub, ucModulated signal；ibatIt is the electric current of battery group；S is
The control signal of switch, θ indicate the angle signal of dq rotatable coordinate axis；
Using twin nuclei:
(1) battery power discharge electric current outer ring: because battery group must be discharged with constant current；Therefore discharge current control is added to
Outer ring；PI controller is for controlling discharge current and being not in static error；Since battery pack can provide DC bus
Voltage support, therefore the voltage stabilization of DC bus is in a certain range, therefore does not need control DC bus-bar voltage；
(2) power network current inner ring: inner ring includes watt current idWith reactive current iqRing；The detected value i of grid-connected currenta, ib, icQuilt
Be converted to the i in synchronous rotating framedWith iq；Again by the i in coordinate systemd, iqWith given current reference id*, iq *Compared
Compared with；And corresponding PI controller is controlled to realize to id, iqZero steady state error control；The output signal of PI controller is carried out anti-
Dq transformation, obtains a, b, and c threephase switch modulates reference signal wave uam, ubm, ucm, and it is grid-connected by SPWM or SVPWM modulation acquisition
The corresponding switching drive signal of converter, to realize the closed-loop control of converter.
8. the topological structure of the novel online long-range contordled capacity experiment of one kind according to claim 1, it is characterized in that: setting
There are collection cell batteries parameter acquisition subsystem, battery analysis and computing subsystem, it is overall to monitor what master system was integrated
Battery management system, single battery are acquired and are calculated respectively by DAQ module and microprocessor module, then with host computer into
Integral monitoring is completed in row communication；The qualified judgement of battery group is carried out according to the acceptable criterion that battery group core holds；
It is implemented as follows:
(1) Usage data collection DAQ module collects the data of battery pack, including electric discharge electricity with sample frequency appropriate and precision
Stream, voltage and temperature；
(2) data collected are sent to microcomputer module, and microcomputer module includes online parameter identification module and state
Viewer；
(3) in parameter identification module, battery dynamic naive model has been used, has used the ginseng of input/output data identification battery
Number；Then the battery model parameter feedback of update is estimated to the SOC and SOH of battery to state observer；
(4) state observer uses the OCV of polynomial equations project battery, open-circuit voltage；Then by the OCV of prediction based on
The end voltage of battery is calculated, and the end voltage of calculating is compared with actual cell voltage；Then using electricity calculate and practical
Error between cell voltage calculates the filter gain in Kalman filter with more new state SOC；
(5) signal of needs is sent to host computer by communication module by treated in above system signal, by upper
Machine carries out overall monitoring；
After host computer obtains the status information of battery group, need to assess it electric power storage to determine whether battery is qualified
The residual capacity in pond is calculated according to following formula,
In above formula: t0Refer to the discharge time of battery unit；When calculating cell capacity CcellWhen, assess its healthy shape
Condition, i0Indicate instant discharge current；
The health status SOH of other batteries accounts for the percentage of rated capacity according to actual capacity to define；Calculate the formula of SOH such as
Under,
In above formula: the rated capacity of Cnominal expression battery；
When the discharge capacity of battery group is greater than 80% rated capacity, 1.8V, battery group capacity is still greater than in discharge voltage
Qualification, battery work on.
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| CN110994721A (en) * | 2019-12-06 | 2020-04-10 | 盖士炎 | Transformer substation direct current system storage battery pack checking discharge circuit |
| CN111008471A (en) * | 2019-12-01 | 2020-04-14 | 国网辽宁省电力有限公司电力科学研究院 | Dynamic optimization method and device for direct-current power supply storage battery pack |
| CN111600347A (en) * | 2020-04-30 | 2020-08-28 | 四川享锂来科技有限公司 | Remote control system for sharing lithium battery |
| CN112363073A (en) * | 2020-12-05 | 2021-02-12 | 云南电网有限责任公司 | One-key type capacity checking device and method for station direct-current storage battery |
| CN112462289A (en) * | 2020-11-18 | 2021-03-09 | 江苏为恒智能科技有限公司 | Storage battery pack online capacity checking management device |
| CN112769193A (en) * | 2021-01-28 | 2021-05-07 | 杭州高特电子设备股份有限公司 | Storage battery pack capacity online protection system and online protection method thereof |
| CN117353429A (en) * | 2023-12-04 | 2024-01-05 | 四川赛柏智晶科技有限公司 | Online nuclear capacity system and method based on power management control |
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