CN105429161B - A kind of charge-discharge control system and method - Google Patents
A kind of charge-discharge control system and method Download PDFInfo
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- CN105429161B CN105429161B CN201510627489.XA CN201510627489A CN105429161B CN 105429161 B CN105429161 B CN 105429161B CN 201510627489 A CN201510627489 A CN 201510627489A CN 105429161 B CN105429161 B CN 105429161B
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Abstract
The invention discloses a kind of charge-discharge control system, including multiple two-way DC DC, a phase sequence control unit, an energy-storage units, an Energy storage controller, charge discharging resisting unit and a two-way AC DC；Also disclose charge/discharge control method：Phase sequence control unit detects whether two-way DC DC install in place；Energy storage controller controls two-way DC DC to tested energy-storage units voltage sample, and phase sequence control unit is configured to each two-way DC DC working condition；The size of Energy storage controller sampling monitoring busbar voltage and electric current, judge whether its voltage meets requirement, if undesirable, phase sequence control unit is according to judged result, in charge and discharge process, two-way DC DC quantity of the adjustment in charged state and the two-way DC DC quantity in discharge condition are until meet the requirements.The present invention substantially increases the charge-discharge test efficiency of tested energy-storage units, reduces the cost of unit under test charge-discharge test, and the influence that involves on power network is minimized, and security is higher.
Description
Technical field
The invention belongs to charging technique field, and in particular to a kind of charge-discharge control system and method.The present invention is applied to
Switching power circuit.
Background technology
In the manufacturing process of battery or electric capacity, it is often necessary to charge-discharge test is carried out to battery or electric capacity, to test electricity
Pond or the capacity of electric capacity, discharge and recharge time, the parameter such as electric current.Traditional charging measurement method is to use two-way AC-DC (Dual
Alternate Current to Direct Current Convertor), direct current is converted to from power network power taking by exchange, then
By bi-directional DC-DC, the charging voltage that being converted to battery or electric capacity allows is charged, during discharge test, battery or electric capacity
Electric charge connects load absorption, or this Partial charge further across two-way AC-DC processing again by bi-directional DC-DC, by direct current
Be converted to exchange and be played back to power network.This way has obvious shortcoming, for high capacity cell or electric capacity full of electric charge, connects negative
Placing electricity carries out next round charge-discharge test, it is necessary to be lot more time to discharge, and testing efficiency is substantially reduced, and allows load
Energy is absorbed, substantial amounts of electric energy can be wasted, next round charge-discharge test is carried out and still needs from power network power taking, this method of testing
Cost is very high.On the other hand, during discharge test, although the electric charge of battery or electric capacity can be played back to power network, but handled not
It may be brought to power network " pollution " well, severe patient may damage electrical equipment and electric power facility due to voltage ripple of power network.
The problem of conventional method is less efficient in the presence of the no quantitative analysis of charging and discharging.
The content of the invention
For defect present in above-mentioned prior art or deficiency, it is an advantage of the invention to provide a kind of charge and discharge
Electric control system.
To achieve these goals, the present invention, which is adopted the following technical scheme that, is solved：
A kind of charge-discharge control system, including multiple bi-directional DC-DCs, a phase sequence control unit, an energy-storage units, an energy
Storage control, charge discharging resisting unit and a two-way AC-DC and the above-mentioned each part of connection bus；Wherein, each bi-directional DC-DC
Input connect with bus；Each bi-directional DC-DC connects phase sequence control unit, energy-storage units and energy by controlling bus
Measure storage control；Phase sequence control unit and Energy storage controller connect energy storage list by controlling bus and direct current supply line
Member；Energy-storage units are connected with two-way AC-DC by bus and controlling bus；Two-way AC-DC connects power network by bus.Wherein,
Between the bi-directional DC-DC, phase sequence control unit, energy-storage units, Energy storage controller, two-way AC-DC by positive polarity and
The bus of negative polarity both threads composition is connected with each other；Phase sequence control unit connects charge discharging resisting unit, energy storage by controlling bus
Unit connects charge discharging resisting unit by bus；
Further, the bi-directional DC-DC phase sequence control unit：Using digital signal processor or embeded processor,
It is being provided with address and data interface circuit.
Further, the energy-storage units are made up of one or one group of storage capacitor.
Further, the Energy storage controller uses single-chip microcomputer or microcontroller, is being provided with address sum
According to interface circuit.
It is a further object of the invention to provide a kind of charge/discharge control method, following steps are specifically included：
Step 1：System electrification；
Step 2：Phase sequence control unit detects each bi-directional DC-DC according to the address information of the address interface of bi-directional DC-DC
Whether install in place, if bi-directional DC-DC is not installed at position, close corresponding bi-directional DC-DC；If at least one is in place,
Then phase sequence control unit sends instruction to Energy storage controller；
Step 3：Energy storage controller is according to the instruction received, electricity of the control bi-directional DC-DC to tested energy-storage units
Pressure is sampled, and sampled result is informed into phase sequence control unit, and phase sequence control unit enters to the working condition of each bi-directional DC-DC
Row is set：If tested energy-storage units need to be charged, set its corresponding two-way according to the requirement of tested energy-storage units
DC-DC working condition is charged state；If tested energy-storage units need electric discharge, its corresponding bi-directional DC-DC is set
Working condition is discharge condition；
Step 4：Energy storage controller real-time sampling monitors busbar voltage and the size of electric current, judges whether its voltage is full
Foot requires that, if undesirable, phase sequence control unit is according to judged result, in charge and discharge process, and adjustment is in charging shape
The bi-directional DC-DC quantity of state and the bi-directional DC-DC quantity in discharge condition are until meet the requirements；If met the requirements, hold
Row step 5；
Step 5：Bi-directional DC-DC is closed, the tested energy storage tested is replaced with tested energy-storage travelling wave tube to be tested
Element, then returnes to step 1, and charge-discharge test is carried out to new tested energy-storage units.
Further, the step 4 is comprised the following steps that：
Step 41：Energy storage controller real-time sampling monitors busbar voltage and the size of electric current, if busbar voltage ratio
The respective value of tested energy-storage units requirement is high, performs step 42；If busbar voltage is than respective value that tested energy-storage units are required
It is low, perform step 45；If busbar voltage meets tested energy-storage units requirement, step 5 is performed；
Step 42：Judging the electric capacity summation that each road is in the corresponding tested energy-storage units of bi-directional DC-DC of charged state is
It is no to be not less than position of minimum capacitance, it is then return to step 41；Otherwise, phase sequence control unit sets the work shape of each road bi-directional DC-DC
State so that required for electric charge of the bi-directional DC-DC charging capacitor summation in charged state not less than reduction on storage bus
Position of minimum capacitance, then performs step 43；
Step 43：Judge whether the summation of all tested energy-storage units capacitances is less than position of minimum capacitance, if it is not,
Then enter step 42；If it is less, whether Energy storage controller monitors busbar voltage and judges busbar voltage higher than safety
Voltage, if above safe voltage, phase sequence control unit controls charge discharging resisting unit to release Partial charge by controlling bus, directly
Safe voltage U is reached to busbar voltageHWhen, close charge discharging resisting unit；
Step 45：Judging the electric capacity summation that each road is in the corresponding tested energy-storage units of bi-directional DC-DC of discharge condition is
It is no to be not less than position of minimum capacitance, it is then return to step 41；Otherwise, phase sequence control unit sets each road bi-directional DC-DC so that be in
The bi-directional DC-DC discharge capacity summation of discharge condition is not less than position of minimum capacitance；
Step 46：Judge whether the summation of all tested energy-storage units capacitances is less than position of minimum capacitance, if it is less,
Return to step 45, is achieved in continuing on bi-directional DC-DC so that more bi-directional DC-DCs participate in electric discharge.Otherwise, level is illustrated
The brownout of contact system internal bus requires supplementation with electric charge, into step 47.
Step 47：Phase sequence control unit opens two-way AC-DC by controlling bus, and power network will be exchanged by AC-DC and changed
Tested energy-storage units charging is given for direct current；Return to step 41.
Further, in the step 42, it is described otherwise, phase sequence control unit sets the work shape of each road bi-directional DC-DC
State so that required for electric charge of the bi-directional DC-DC charging capacitor summation in charged state not less than reduction on storage bus
Position of minimum capacitance, then performs step 43 and specifically refers to：
Calculate the position of minimum capacitance C required for the electric charge of reduction on storage busmin, it is individual that phase sequence control unit opens at least n
Bi-directional DC-DC charges to its corresponding tested energy-storage units；Into step 43；
N=Cmin/C0
Wherein, C0To be tested the capacitance of energy-storage units, the electric capacity of each tested energy-storage units is equal；CminIt is female for storage
Position of minimum capacitance on line required for the electric charge of reduction.
Further, step 44 is also included between the step 43 and step 45：Phase sequence control unit passes through control
Bus processed opens two-way AC-DC and is converted to direct current after exchange, is fed back to power network, in this process, Energy storage controller prison
Busbar voltage is controlled, until busbar voltage drops to normal voltage U from safe voltageT, close two-way AC-DC；Return to step 41.
Beneficial effects of the present invention：
(1) in the present invention, multichannel bi-directional DC-DC is cascaded, as long as accomplishing the phase of each road bi-directional DC-DC discharge and recharge in theory
Position (sequential) is staggered, as long as the load of power network allows, is not limited in the quantity of cascade, multigroup tested energy storage can be carried out simultaneously
The charge-discharge test of unit, because discharge and recharge is according to theoretical calculation progress quantitative analysis, substantially increases tested energy-storage units
Charge-discharge test efficiency.
(2) in the present invention, in parallel, the power realization of raising cascade system is carried out using multiple low power bi-directional DC-DCs
Charge-discharge test is carried out to the energy-storage units of high-power Large Copacity, reduce charge-discharge control system research and development technical difficulty and into
This.
(3) in the present invention, during charge-discharge test, when detecting busbar voltage higher than preset value, first at adjustment
It is not less than position of minimum capacitance in the bi-directional DC-DC charging capacitor summation of charged state, next to that charge discharging resisting unit absorbs, finally
Power network absorption is only, power network participates in less, thus greatly reduces the cost of unit under test charge-discharge test.This mode will
The influence that involves on power network is minimized, and compared with general charging system, security is higher.
(4) in the present invention, quantitative analysis, the method that economize on electricity and power consumption can be according to the present invention are carried out to charge-discharge test
Analyzed, so that the efficiency for improving charge-discharge control system reduces the cost of system operation.
Brief description of the drawings
Fig. 1 is the charge-discharge control system schematic diagram of the present invention.
Fig. 2 is the Inner Constitution schematic diagram of bi-directional DC-DC.
Fig. 3 is the workflow diagram of the charge/discharge control method of the present invention.
The implementation to technical scheme is described in further detail below in conjunction with the accompanying drawings.
Embodiment
As shown in figure 1, the charge-discharge control system of the present invention includes multiple bi-directional DC-DCs, a phase sequence control unit, a storage
Can unit, an Energy storage controller, charge discharging resisting unit, a two-way AC-DC and the bus for connecting above-mentioned each part；Its
In, the input of each bi-directional DC-DC connects with bus so that all bi-directional DC-DCs formation cascade system；Each two-way DC-
DC connects phase sequence control unit, energy-storage units and Energy storage controller by controlling bus；Controlling bus by address wire and
Data line group into；Phase sequence control unit and Energy storage controller connect energy storage list by controlling bus and direct current supply line
Member；Energy-storage units are connected with two-way AC-DC by bus and controlling bus；Two-way AC-DC connects power network by bus.Wherein,
Between the bi-directional DC-DC, phase sequence control unit, energy-storage units, Energy storage controller, two-way AC-DC by positive polarity and
The bus of negative polarity both threads composition is connected with each other；Phase sequence control unit connects charge discharging resisting unit, energy storage by controlling bus
Unit connects charge discharging resisting unit by bus.
Tested energy-storage units (application) when in use, are connected one by the charge-discharge control system of the present invention by bus
Individual bi-directional DC-DC.Tested energy-storage units use single battery or single electric capacity, or using by multiple batteries or multiple electric capacity structures
Into energy-storage units group, or using it is other with energy storage act on elements.Tested energy-storage units are connected with the system of the present invention
Afterwards, complete the storage of electric charge or release so that as tested object, test content be tested energy-storage units storage electric charge and
Release related voltage, electric current and the power of electric charge.
The specific setting of each several part is as follows in the charge-discharge control system of the present invention：
Bi-directional DC-DC：Bi-directional DC-DC in the present invention is switched with bi-directional DC-DC common in switch power technology field
Power supply does not have essential distinction, only added on common bi-directional DC-DC analog-digital converter, DC conversion unit and data and
Address interface.Wherein, analog-digital converter is connected with tested energy-storage units, for gathering bi-directional DC-DC input and output side
Voltage and current, and tested energy-storage units voltage, current parameters, and report Energy storage controller and phase sequence control list
Member.DC conversion unit is used to the DC voltage and electric current of bus being converted to analog-digital converter, data and address interface needs
Operating voltage, DC conversion unit can be made up of the relatively low buck converter of operating voltage, and such as Ti operating voltage is
5V TPS65051 is realized.Data and address interface are connected with Energy storage controller.On the one hand it is used for phase sequence control unit
The judgement whether in place to bi-directional DC-DC, realizes the work(that phase sequence control unit is configured to bi-directional DC-DC working condition on and off
Energy.On the other hand it is used to receive the instruction of Energy storage controller, instruction interaction, data biography is carried out with Energy storage controller
It is defeated.In addition to above-mentioned functions, bi-directional DC-DC is used to the DC voltage and electric current of bus being converted to what tested energy-storage units needed
Operating voltage and electric current, or by the operating voltage that the voltage conversion of tested energy-storage units is bus, namely for being stored up to be tested
Can unit offer discharge and recharge DC converting function.
Phase sequence control unit：Using digital signal processor or embeded processor, address and data are being provided with
Interface circuit, can detect the situation in place of bi-directional DC-DC.Phase sequence control unit is used for the finger for receiving Energy storage controller
Order, the working condition that each bi-directional DC-DC is adjusted according to instruction is to belong to open or close, and is place during the state in opening
In charging or discharge condition；Simultaneously, it is ensured that each bi-directional DC-DC staggers in phase, so that it is guaranteed that all tested storages in system
The discharge and recharge of energy unit is carried out in order, reaches dynamic equilibrium.The state of bi-directional DC-DC include charged state, discharge condition and/or
Closed mode.It controls the working condition of charge discharging resisting unit and energy-storage units also by controlling bus simultaneously.
Energy-storage units, are made up of one or one group of storage capacitor, for stablizing cascade system during charge or discharge
The impact to bus voltage brought, plays filtering effect.
Energy storage controller：Using single-chip microcomputer or microcontroller, address and data interface circuit are being provided with.With
In control bi-directional DC-DC, energy-storage units and phase sequence control unit.Specifically：Energy storage controller is used to receive bi-directional DC-DC
The bi-directional DC-DC input and the electric current and magnitude of voltage of output end reported, and thus judge whether needed in charge and discharge process
Two-way AC-DC is opened, to discharge electric charge to power network, or system is after the discharge and recharge of certain time, because energy loss is
It is no to need to supplement electric charge to cascade system, to maintain the dynamic equilibrium of system discharge and recharge under the conditions of default voltage and current；
Meanwhile, instruction is sent to phase sequence control unit according to judged result control is made with the state to bi-directional DC-DC.
Charge discharging resisting unit：It is made up of one or more resistance class devices, for unnecessary as load absorption in systems
Electric charge, it is to avoid unnecessary electric charge discharges to power network.
Two-way AC-DC：Two-way AC-DC in the present invention is with Switching Power Supply common in switch power technology field without this
Matter is distinguished, and it differs only in it and is integrated with digital interface function, and is connected on address and data/address bus, can receive energy
The instruction of storage control is measured, direct current is completed to exchange and the conversion of AC-to DC, is that cascade system carries out energy with power network
The door of exchange.
As shown in figure 3, the charge/discharge control method of the present invention specifically includes following steps：
Step 1：System electrification；
Step 2：Phase sequence control unit detects each bi-directional DC-DC according to the address information of the address interface of bi-directional DC-DC
Whether install in place, if bi-directional DC-DC is not installed at position (i.e. its address information is consistent with before installation), close corresponding double
To DC-DC；If at least one is in place, phase sequence control unit sends instruction to Energy storage controller；
Step 3：Energy storage controller is according to the instruction received, electricity of the control bi-directional DC-DC to tested energy-storage units
Pressure is sampled, and when the voltage of tested energy-storage units is less than its own job requirement, shows that tested energy-storage units now need
Charged, otherwise demonstrate the need for electric discharge；The state of each tested energy-storage units is informed phase sequence control list by Energy storage controller
Member, phase sequence control unit is configured according to the state of each tested energy-storage units come the working condition to each bi-directional DC-DC：If
Tested energy-storage units are needed to be charged, then the work of its corresponding bi-directional DC-DC is set according to the requirement of tested energy-storage units
State is charged state, and charged state includes charging current, charging voltage；If tested energy-storage units need electric discharge, set
The working condition of its corresponding bi-directional DC-DC is discharge condition, and discharge condition includes discharge current, discharge voltage；Meanwhile, phase sequence
Control unit is also set to the voltage between all bi-directional DC-DCs, the phase relation of electric current, is opened or closed with to ensure it
State and other DC-DC are not clashed；
Step 4：Energy storage controller real-time sampling monitors busbar voltage and the size of electric current, judges whether its voltage is full
Foot requires that, if undesirable, phase sequence control unit is according to judged result, in charge and discharge process, and adjustment is in charging shape
The bi-directional DC-DC quantity of state and the bi-directional DC-DC quantity in discharge condition are until meet the requirements；If met the requirements, hold
Row step 5.It is specific as follows：
Step 41：Energy storage controller real-time sampling monitors busbar voltage and the size of electric current, if busbar voltage ratio
The respective value of tested energy-storage units requirement is high, performs step 42；If busbar voltage is than respective value that tested energy-storage units are required
It is low, perform step 45；If busbar voltage meets tested energy-storage units requirement, step 5 is performed.
Step 42：Judging the electric capacity summation that each road is in the corresponding tested energy-storage units of bi-directional DC-DC of charged state is
It is no to be not less than position of minimum capacitance, it is then return to step 41；Otherwise, phase sequence control unit sets the work shape of each road bi-directional DC-DC
State so that required for electric charge of the bi-directional DC-DC charging capacitor summation in charged state not less than reduction on storage bus
Position of minimum capacitance, then performs step 43.Otherwise the concrete operations are as follows：
Input current, input electricity by phase sequence control unit according to the current voltage and current of bus and bi-directional DC-DC
Pressure, output voltage, output current, the pressure-resistant scope of tested energy-storage units, estimation need that opens to be in the two-way of charged state
DC-DC quantity.For convenience of estimating, with the electric capacity C of each tested energy-storage units0, illustrate exemplified by pressure-resistant scope all same.According to
The charge number lost in bus is equal with the charge number that electric capacity in unit under test is stored, the efficiency of each bi-directional DC-DC, input electricity
Pressure, input current, output voltage, output current difference are identical.
If it is Il that the current voltage of bus, which is Ul, electric current,；The output voltage of bi-directional DC-DC be U2, output current be I2, it is defeated
It is that I1, efficiency are a to enter electric current；After the Δ t times, the voltage normal value U of bust, electric current be It, then bus is by current flow
After Il elapsed time Δs t, the charge Q m of reduction is：
Qm=(Il-It)×Δt (1)
The effectiveness formula of bi-directional DC-DC is：
U2×I2/(Ut×Il)=a (2)
When busbar voltage is U1, it is U to be tested the initial magnitude of voltage of energy-storage unitsc1, as busbar voltage normal value UtWhen, quilt
The voltage for surveying energy-storage units is Uc2, the electric charge of electric capacity C storages is Qc, then has following relational expression to set up：
Qc=(Uc2-Uc1)×C (3)
UC2=U2 (4)
According to the charge number of bus reduction i.e. Qm=Qc equal with the charge number that tested energy-storage units are stored, by (1)-(4),
Obtain the position of minimum capacitance C required for the electric charge of reduction on storage busmin：
Cmin=I2 × Δ t × (Il-It)/(Ut×Il×a-Uc1×I2) (5)
In formula, Ut、It, Δ t, a be all known quantity, the value of other voltage and currents all passes through the modulus in bi-directional DC-DC and turned
Parallel operation is collected；In order to calculate position of minimum capacitance Cmin, the maximum pressure voltage of its operating voltage U2 power takings appearance.
Phase sequence control unit opens at least n bi-directional DC-DC and (sets these to its corresponding tested energy-storage units charging
Bi-directional DC-DC is in charged state), into step 43；
N=Cmin/C0 (6)
Wherein, C0To be tested the capacitance of energy-storage units, the electric capacity of each tested energy-storage units is equal；CminIt is female for storage
Position of minimum capacitance on line required for the electric charge of reduction.
Step 43：Judge whether the summation of all tested energy-storage units capacitances is less than the position of minimum capacitance that formula (5) is obtained,
If it is not, then entering step 42；Even if if it is less, all bi-directional DC-DCs in place of explanation are completely in charging shape
State, tested energy-storage units can not also fully absorb unnecessary electric charge (i.e. the voltage of bus can not be reduced effectively).Now, energy is deposited
Whether storage controller monitoring busbar voltage simultaneously judges busbar voltage higher than the safe voltage shown in formula 7, if above safe voltage,
Phase sequence control unit controls charge discharging resisting unit to release Partial charge to reduce busbar voltage by controlling bus, until bus electricity
It is pressed onto up to safe voltage UHWhen, charge discharging resisting unit is closed, step 44 is performed.For ohmic load, unnecessary electric charge turns
Thermal energy consumption is changed to reduce busbar voltage.
Obtained according to law of conservation of energy：C×(UH-UT)×(UH-UT)/2=N × 3600/a, it can thus be concluded that formula 7：
UH=(UT+7200×N/(a×C))1/2 (7)
Wherein, C is the capacitance summation of tested energy-storage units and energy-storage units；UHFor the safety electricity of bus feedback grid
Pressure；UTFor bus normal voltage；N is the electric energy for requiring to save, unit：Degree；Two-way AC-DC conversion efficiency is a；3600 represent
3600 seconds；
For example, electric automobile charging/discharging apparatus to battery pack when doing discharge test, UTFor 540V, it is desirable to save 100 degree
Electricity, the equivalent total capacitance of output capacitance for battery pack and charging/discharging apparatus is 0.8f, and two-way AC-DC efficiency is 0.9, then
According to (7) formula, it can calculate：
UH=(UT+7200×N/(a×C))1/2=(540+7200 × 100/ (0.9) × 0.8)1/2≈ 1kV, that is, work as battery
Group total voltage from 1kV be reduced to 540V when, can save 100 degree electricity.
Although in addition, can effectively be released bus excess charge by above-mentioned charge discharging resisting unit, to a certain degree
On can consume electric energy, therefore, it can on the basis of step 43 perform step 44, during excess charge of releasing realize section
Energy.
Step 44：Phase sequence control unit opens two-way AC-DC by controlling bus and is converted to direct current after exchange, is fed back to
Power network, in this process, Energy storage controller monitoring busbar voltage, until busbar voltage drops to normal voltage from safe voltage
UT, close two-way AC-DC；Return to step 41.
Because step 44 is that bus experienced and be carried out after electric charge transfer, charge discharging resisting between bi-directional DC-DC, therefore feedback
The energy of power network seldom, is not enough to impact power network.
Step 45：Judging the electric capacity summation that each road is in the corresponding tested energy-storage units of bi-directional DC-DC of discharge condition is
It is no to be not less than position of minimum capacitance, it is then return to step 41；Otherwise, phase sequence control unit sets each road bi-directional DC-DC so that be in
The bi-directional DC-DC discharge capacity summation of discharge condition is not less than position of minimum capacitance；Subsequently into step 46.Otherwise specific
Operation is as follows：
Input current, input electricity by phase sequence control unit according to the current voltage and current of bus and bi-directional DC-DC
Pressure, output voltage, output current, the pressure-resistant scope of tested energy-storage units, estimation need that opens to be in the two-way of discharge condition
The method phase of the quantity of the bi-directional DC-DC of position of minimum capacitance and charged state is estimated in DC-DC quantity, evaluation method and step 42
Together.Finally give the minimum value of position of minimum capacitance and the quantity of the bi-directional DC-DC in discharge condition.
Step 46：Judge whether the summation of all tested energy-storage units capacitances is less than the position of minimum capacitance that formula (5) is obtained,
If it is less, return to step 45, is achieved in continuing on bi-directional DC-DC so that more bi-directional DC-DCs participate in electric discharge.
Otherwise, illustrate that the brownout of cascade system internal bus requires supplementation with electric charge, into step 47.
Step 47：Phase sequence control unit opens two-way AC-DC by controlling bus, and power network will be exchanged by AC-DC and changed
Tested energy-storage units charging is given for direct current；Return to step 41.
Step 5：Bi-directional DC-DC is closed, the tested energy storage tested is replaced with tested energy-storage travelling wave tube to be tested
Element, then returnes to step 1, and charge-discharge test is carried out to new tested energy-storage units.
Charge-discharge control system proposed by the present invention and method, compared with general charge-discharge control system, most significantly
Feature is：System is equipped with phase sequence control unit so that tested energy-storage units participate in discharge and recharge, improve tested energy storage list
The efficiency for charge-discharge of member.During busbar voltage is reduced, bus electricity is first reduced using the charging of tested energy-storage units
Pressure, if tested energy-storage units charging can not make busbar voltage be reduced to defined value, is absorbed using charge discharging resisting unit
Electric charge reduces busbar voltage, is then then turned on two-way AC-DC by the mode of the unnecessary such tertiary treatment of electric charge feedback grid, this
So that while reduction busbar voltage, moreover it is possible to while saving electric energy and reduce cost, be greatly reduced the influence to power network.Together
Reason, during busbar voltage is lifted, it is bus delivered charge to first pass through the tested energy-storage units of unlatching, if can not make mother
Line voltage is increased to defined value, then when needing to supplement energy to cascade system, again by quantitative analysis, it is estimated that needing
Power network is wanted to supplement the estimated value of energy so that power consumption is minimum.
Claims (4)
1. a kind of charge/discharge control method, it is characterised in that specifically include following steps：
Step 1：System electrification；
Step 2：Whether phase sequence control unit detects each bi-directional DC-DC according to the address information of the address interface of bi-directional DC-DC
Install in place, if bi-directional DC-DC is not installed at position, close corresponding bi-directional DC-DC；If at least one is in place, phase
Sequence control unit sends instruction to Energy storage controller；
Step 3：Energy storage controller enters according to the instruction received, control bi-directional DC-DC to the voltage for being tested energy-storage units
Row sampling, and sampled result is informed into phase sequence control unit, phase sequence control unit is set to the working condition of each bi-directional DC-DC
Put：If tested energy-storage units need to be charged, its corresponding bi-directional DC-DC is set according to the requirement of tested energy-storage units
Working condition be charged state；If tested energy-storage units need electric discharge, the work shape of its corresponding bi-directional DC-DC is set
State is discharge condition；
Step 4：Energy storage controller real-time sampling monitors busbar voltage and the size of electric current, judges whether its voltage meets and wants
Ask, if undesirable, phase sequence control unit is according to judged result, in charge and discharge process, adjustment is in charged state
Bi-directional DC-DC quantity and bi-directional DC-DC quantity in discharge condition are until meet the requirements；If met the requirements, step is performed
Rapid 5；
Step 5：Bi-directional DC-DC is closed, the tested energy-storage travelling wave tube tested is replaced with tested energy-storage travelling wave tube to be tested,
Step 1 is then returned to, charge-discharge test is carried out to new tested energy-storage units.
2. charge/discharge control method as claimed in claim 1, it is characterised in that the step 4 is comprised the following steps that：
Step 41：Energy storage controller real-time sampling monitors busbar voltage and the size of electric current, if busbar voltage is than tested
The respective value of energy-storage units requirement is high, performs step 42；If busbar voltage is lower than the respective value that tested energy-storage units are required, hold
Row step 45；If busbar voltage meets tested energy-storage units requirement, step 5 is performed；
Step 42：Judge whether not each road is in the electric capacity summation of the corresponding tested energy-storage units of bi-directional DC-DC of charged state
It is then return to step 41 less than position of minimum capacitance；Otherwise, phase sequence control unit sets the working condition of each road bi-directional DC-DC, makes
The bi-directional DC-DC charging capacitor summation in charged state is obtained not less than the minimum electricity required for the electric charge of reduction on storage bus
Capacitance, then performs step 43；
Step 43：Judge whether the summation of all tested energy-storage units capacitances is less than position of minimum capacitance, if it is not, then entering
Enter step 42；If it is less, Energy storage controller monitors busbar voltage and judges whether busbar voltage is higher than safe voltage,
If above safe voltage, phase sequence control unit controls charge discharging resisting unit to release Partial charge by controlling bus, until female
Line voltage reaches safe voltage UHWhen, close charge discharging resisting unit；
Step 45：Judge whether not each road is in the electric capacity summation of the corresponding tested energy-storage units of bi-directional DC-DC of discharge condition
It is then return to step 41 less than position of minimum capacitance；Otherwise, phase sequence control unit sets each road bi-directional DC-DC so that in electric discharge
The bi-directional DC-DC discharge capacity summation of state is not less than position of minimum capacitance；
Step 46：Judge whether the summation of all tested energy-storage units capacitances is less than position of minimum capacitance, if it is less, returning
Step 45, it is achieved in continuing on bi-directional DC-DC so that more bi-directional DC-DCs participate in electric discharge；Otherwise, illustrate that level is contacted
The brownout of system internal bus requires supplementation with electric charge, into step 47；
Step 47：Phase sequence control unit opens two-way AC-DC by controlling bus, and power network is converted to exchange directly by AC-DC
Flow and give the charging of tested energy-storage units；Return to step 41.
3. charge/discharge control method as claimed in claim 2, it is characterised in that in the step 42, it is described otherwise, phase sequence control
Unit processed sets the working condition of each road bi-directional DC-DC so that the bi-directional DC-DC charging capacitor summation in charged state is not small
Position of minimum capacitance required for the electric charge of reduction on storage bus, then performs step 43 and specifically refers to：
Calculate the position of minimum capacitance C required for the electric charge of reduction on storage busmin, it is individual two-way that phase sequence control unit opens at least n
DC-DC charges to its corresponding tested energy-storage units；Into step 43；
n=Cmin/ C0
Wherein, C0To be tested the capacitance of energy-storage units, the electric capacity of each tested energy-storage units is equal；CminTo subtract on storage bus
Position of minimum capacitance required for few electric charge.
4. charge/discharge control method as claimed in claim 2, it is characterised in that between the step 43 and step 45 also
Include step 44：Phase sequence control unit opens two-way AC-DC by controlling bus and is converted to direct current after exchange, is fed back to electricity
Net, in this process, Energy storage controller monitoring busbar voltage, until busbar voltage drops to normal voltage from safe voltage
UT, close two-way AC-DC；Return to step 41.
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| CN110544933B (en) | 2018-05-28 | 2022-10-18 | 中国移动通信集团设计院有限公司 | Control method and device of distributed direct current power supply system |
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| CN204230948U (en) * | 2014-09-30 | 2015-03-25 | 深圳市盛弘电气有限公司 | A kind of new forms of energy feed-type charge-discharge machine |
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