CN106786706A - The control method and device of Bidirectional charging-discharging system - Google Patents
The control method and device of Bidirectional charging-discharging system Download PDFInfo
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- 238000007599 discharging Methods 0.000 title claims abstract description 251
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000033228 biological regulation Effects 0.000 claims abstract description 46
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- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 3
- 235000008434 ginseng Nutrition 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 14
- 230000005611 electricity Effects 0.000 description 11
- 239000000446 fuel Substances 0.000 description 6
- 230000005355 Hall effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000000205 computational method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H02J2007/0067—
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of control method and device of Bidirectional charging-discharging system, the method includes：Obtain exchange average active power and direct current average active power in Bidirectional charging-discharging system；The overall discharging efficiency of Bidirectional charging-discharging system is calculated according to exchange average active power and direct current average active power；Obtain the current DC bus-bar voltage of Bidirectional charging-discharging system；According to overall discharging efficiency and current DC bus-bar voltage, optimal DC bus-bar voltage when regulation DC bus-bar voltage reference value Approach by inchmeal entirety discharging efficiency is maximum；According to DC bus-bar voltage reference value and current DC bus-bar voltage after regulation, the overall discharging efficiency of regulation, until overall discharging efficiency is maximum.The control method and device of the Bidirectional charging-discharging system, according to overall discharging efficiency and current DC bus-bar voltage, adjust DC bus-bar voltage reference value, so as to adjust overall discharging efficiency, the discharging efficiency of Bidirectional charging-discharging system is ensure that, control process is simple, and range of application is relatively broad.
Description
Technical field
The present invention relates to automation field, more particularly to a kind of control method and device of Bidirectional charging-discharging system.
Background technology
With increasing environmental pollution, appearance the problems such as energy shortage, the electric automobile of environmental protection arises at the historic moment.It is electronic at present
The application of automobile, it is that energy-storage battery charges that majority is electric automobile by charging system from power network energy absorption, for V2G/V2H
(Vehicle to Grid/Home, battery energy storage is transported to power network) technology is wished can be when electric automobile be idle, will be electronic
Unnecessary energy storage feeds back to power network in automobile, also will be one of important directions of following intelligent grid construction and application, therefore, it is double
Important effect is played during electric automobile and power grid energy transmitted in both directions is realized to charge-discharge system.
During current Bidirectional charging-discharging systematic difference, in order to reduce the dc-link capacitance of Bidirectional charging-discharging system,
It is general to use sinusoidal discharge and recharge technical role in Bidirectional charging-discharging system, can effectively be reduced together using power decoupled in the technology
Deng the bus capacitor value under the conditions of DC bus-bar voltage ripple, but, the application of sinusoidal charge and discharge power technology can produce switching loss
And noise, cause efficiency to decline, therefore, in discharge process, discharging efficiency is low.
The content of the invention
Based on this, it is necessary to realize ask low to discharging efficiency in power network discharge process for using Bidirectional charging-discharging system
Topic, there is provided the control method and device of a kind of Bidirectional charging-discharging system.
A kind of Bidirectional charging-discharging system control method, comprises the following steps：
Obtain exchange average active power and direct current average active power in Bidirectional charging-discharging system；
The overall electric discharge effect of Bidirectional charging-discharging system is calculated according to exchange average active power and direct current average active power
Rate；
The current DC bus-bar voltage of Bidirectional charging-discharging system is obtained, current DC bus-bar voltage is cell voltage by putting
Voltage after circuit；
According to overall discharging efficiency and current DC bus-bar voltage, the DC bus-bar voltage ginseng of Bidirectional charging-discharging system is adjusted
Examine optimal DC bus-bar voltage during value Approach by inchmeal entirety discharging efficiency maximum；
According to DC bus-bar voltage reference value and current DC bus-bar voltage after regulation, the overall discharging efficiency of regulation, directly
It is maximum to overall discharging efficiency.
Wherein in one embodiment, according to overall discharging efficiency and current DC bus-bar voltage, Bidirectional charging-discharging is adjusted
The step of optimal DC bus-bar voltage when the DC bus-bar voltage reference value Approach by inchmeal entirety discharging efficiency of system is maximum, bag
Include：
If Udc(k+1)>Udc(k), and η (k+1)>η (k), then Udcref(k+2)=Udcref(k+1)+Ustep；
If Udc(k+1)>Udc(k), and η (k+1)<η (k), then Udcref(k+2)=Udcref(k+1)-Ustep；
If Udc(k+1)<Udc(k), and η (k+1)>η (k), then Udcref(k+2)=Udcref(k+1)-Ustep；
If Udc(k+1)<Udc(k), and η (k+1)<η (k), then Udcref(k+2)=Udcref(k+1)+Ustep；
If Udc(k+1)=Udc(k), and η (k+1)=η (k), then Udcref(k+2)=Udcref(k+1)；
Wherein, UdcIt is current DC bus-bar voltage, η is overall discharging efficiency, UdcrefIt is DC bus-bar voltage reference value,
UstepIt is step-length of the DC bus-bar voltage with reference to value changes, k is positive integer, k-th cycle of expression.
Wherein in one embodiment, DC bus-bar voltage is the rated value of DC bus-bar voltage with reference to the step-length of value changes
1%-2%.
Wherein in one embodiment, according to DC bus-bar voltage reference value and current DC bus-bar voltage after regulation,
The overall discharging efficiency of regulation, until the maximum step of overall discharging efficiency, including：
Step A：Pulsewidth modulation control is generated by the DC bus-bar voltage reference value after current DC bus-bar voltage and regulation
Signal processed；
Step B：The discharging efficiency of discharge circuit is adjusted by pulse-width modulation control signal, and then adjusts overall electric discharge effect
Rate；
A and step B repeat the above steps until overall discharging efficiency is maximum.
Wherein in one embodiment, two-way charge and discharge is calculated according to exchange average active power and direct current average active power
The step of overall discharging efficiency of electric system, including：
Wherein, P1It is exchange average active power, P2It is direct current active power, η is overall discharging efficiency.
A kind of Bidirectional charging-discharging control device, including：
Bidirectional charging-discharging system；
First power checker, the DC terminal with Bidirectional charging-discharging system is connected, and the first power checker is used to measure
The direct current average active power of Bidirectional charging-discharging system；
Second power checker, is connected with the end that exchanges of Bidirectional charging-discharging system, and the second power checker is used to measure
The exchange average active power of Bidirectional charging-discharging system；
Main controller, is connected with the first power checker and the second power checker respectively, and main controller is used for according to exchange
Average active power and direct current average active power calculate the overall discharging efficiency of Bidirectional charging-discharging system, and obtain two-way charge and discharge
After the current DC bus-bar voltage of electric system, according to overall discharging efficiency and current DC bus-bar voltage, Bidirectional charging-discharging is adjusted
Optimal DC bus-bar voltage when the DC bus-bar voltage reference value Approach by inchmeal entirety discharging efficiency of system is maximum；
Modulator, input is connected with main controller, and output end is connected with Bidirectional charging-discharging system, and modulator is used for root
According to DC bus-bar voltage reference value and current DC bus-bar voltage after regulation, the overall discharging efficiency of regulation, until overall electric discharge
Efficiency is maximum.
Wherein in one embodiment, it is whole that main controller adjusts DC bus-bar voltage reference value Approach by inchmeal by below equation
Optimal DC bus-bar voltage when body discharging efficiency is maximum：
Work as Udc(k+1)>Udc(k), and η (k+1)>During η (k), Udcref(k+2)=Udcref(k+1)+Ustep；
Work as Udc(k+1)>Udc(k), and η (k+1)<During η (k), Udcref(k+2)=Udcref(k+1)-Ustep；
Work as Udc(k+1)<Udc(k), and η (k+1)>During η (k), Udcref(k+2)=Udcref(k+1)-Ustep；
Work as Udc(k+1)<Udc(k), and η (k+1)<During η (k), Udcref(k+2)=Udcref(k+1)+Ustep；
Work as Udc(k+1)=Udc(k), and during η (k+1)=η (k), Udcref(k+2)=Udcref(k+1)；
Wherein, UdcIt is DC bus-bar voltage, η is overall discharging efficiency, UdcrefIt is DC bus-bar voltage reference value, UstepFor
With reference to the step-length of value changes, k is positive integer to DC bus-bar voltage, represents k-th cycle.
Wherein in one embodiment, DC bus-bar voltage is the rated value of DC bus-bar voltage with reference to the step-length of value changes
1%-2%.
Wherein in one embodiment, main controller calculates the overall electric discharge effect of Bidirectional charging-discharging system by below equation
Rate：
Wherein, P1It is exchange average active power, P2It is direct current average active power, η is overall discharging efficiency.
Wherein in one embodiment, modulator includes：
Adder, for being calculated the by the DC bus-bar voltage reference value after current DC bus-bar voltage with regulation
One error signal；
Pi regulator, is connected with the output end of adder, and pi regulator is used to generate given electricity by the first error signal
Stream；
Phaselocked loop, is connected with pi regulator, and phaselocked loop is used to lock the phase of given electric current；
Electric current loop, is connected with phaselocked loop, and electric current loop is used to obtain voltage control signal according to given electric current；
SPWM generators, the control end of SPWM generators is connected with electric current loop, output end and the electric discharge electricity of SPWM generators
Road is connected, after SPWM generators are used to generate pwm control signal according to voltage control signal, output to discharge circuit.
The control method and device of above-mentioned Bidirectional charging-discharging system, according to overall discharging efficiency and current dc bus electricity
Pressure, adjusts the optimal direct current during DC bus-bar voltage reference value Approach by inchmeal entirety discharging efficiency maximum of Bidirectional charging-discharging system
Busbar voltage, such that it is able to according to the DC bus-bar voltage reference value after regulation and the overall electric discharge of current DC bus-bar voltage regulation
Efficiency, repeats said process, until overall discharging efficiency is maximum, it is ensured that the discharging efficiency of Bidirectional charging-discharging system, controls
Journey is simple, and range of application is relatively broad.
Brief description of the drawings
Fig. 1 is the structural representation of Bidirectional charging-discharging system control device in an embodiment；
Fig. 2 is the structural representation of the Bidirectional charging-discharging system in embodiment illustrated in fig. 1；
Fig. 3 is DC bus-bar voltage-efficiency curve diagram in an embodiment；
Fig. 4 is the structural representation of modulator in embodiment illustrated in fig. 1；
Fig. 5 is the flow chart of Bidirectional charging-discharging system control method in an embodiment.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
Herein, such as left and right, upper and lower, front and rear, and first and second etc relational terms are used merely to area
Divide an entity or action and another entity or action, and it is any between not necessarily requiring or implying this entity or act
Actual this relation or order.Term " including ", "comprising" or any other variant be intended to including for nonexcludability, by
This causes to include process, method, article or the equipment of a series of key elements not only comprising these key elements, but also comprising not bright
Other key elements really listed, or be this process, method, article or the intrinsic key element of equipment.
Reference picture 1, in this embodiment, there is provided a two-way charge-discharge system control device, it can include two-way charge and discharge
Electric system 100, the first power checker 200, the second power checker 300, main controller 400 and modulator 500.Wherein,
The output end of one power checker 200 is connected with the DC terminal of Bidirectional charging-discharging system 100, the second power checker 300 with
The exchange end of Bidirectional charging-discharging system 100 is connected, main controller 400 can respectively with the output end of the first power checker 200
Output end with the second power checker 300 is connected, and the input of modulator 500 is connected with the output end of main controller 400, adjusts
The output end for controlling device 500 is connected with Bidirectional charging-discharging system 100.
In the present embodiment, Fig. 2 is can refer to, the exchange end of Bidirectional charging-discharging system 100 is connected with power network, and power network can be intelligence
Energy power network, household power system, building power network etc., the DC terminal of Bidirectional charging-discharging system 100 is connected with battery, and battery can be electric power storage
Pond, such as lead-acid accumulator, nickel radical battery, sodium-sulphur battery, serondary lithium battery, air cell, or fuel cell, such as alkali
Property fuel cell (AFC), phosphoric acid fuel cell (PAFC), molten carbonate fuel cell (MCFC), solid oxide fuel electricity
Pond (SOFC), Proton Exchange Membrane Fuel Cells (PEMFC), DMFC (DMFC) etc..Bidirectional charging-discharging system 100
Including single-phase full bridge converter 110, charging circuit 120 and discharge circuit 130.Second end of single-phase full bridge converter 110 with
Power network is connected, and the input of charging circuit 120 is connected with the first end of single-phase full bridge converter 110, the output of discharge circuit 130
The first end for becoming device 110 with single-phase full bridge is held to be connected, and discharge circuit 130 is in parallel with charging circuit 120.Single-phase full bridge converter
110 can be from AC network energy absorption, it is also possible to AC network input energy；Charging circuit 120 can be using symmetrical half
Bridge LLC (Logical Link Control, logic link control) resonant mode two-way DC-DC circuit, when with two-way charge and discharge
The connected battery of electric system 100 from power network energy absorption when, the operation work of charging circuit 120；It is right that discharge circuit 130 can be used
Claim half-bridge logical link control (LLC) resonant formula two-way DC-DC circuit, when the battery being connected with Bidirectional charging-discharging 100 is to power network input energy,
Discharge circuit 130 runs work.
In the present embodiment, the first power checker 200 can be using diode power device, Hall effect power device etc., first
Power checker 200 is by obtaining the voltage and electric current of the DC terminal of Bidirectional charging-discharging system 100, and the voltage that will be got and electricity
Circulation turns to direct current average active power；Second power checker 300 can also use diode power device, Hall effect power device
Exchange the voltage and electric current at end by obtaining Bidirectional charging-discharging system 100 Deng, the second power checker 300, and will get
Voltage is converted into electric current and exchanges average active power；Main controller 400 can obtain the direct current that the first power checker 200 is measured
The exchange average active power that average active power and the second power checker 300 are measured, and according to direct current average active power
The overall discharging efficiency η of Bidirectional charging-discharging system 100 is calculated with average active power is exchanged, and is obtaining Bidirectional charging-discharging system
100 current DC bus-bar voltage UdcAfterwards, according to overall discharging efficiency η and current DC bus-bar voltage Udc, adjust two-way charge and discharge
The DC bus-bar voltage reference value U of electric system 100dcrefOptimal dc bus electricity when Approach by inchmeal entirety discharging efficiency η is maximum
Pressure；Modulator 500 is according to the DC bus-bar voltage reference value U after regulationdcrefWith current DC bus-bar voltage Udc, regulation entirety
Discharging efficiency η, until overall discharging efficiency η is maximum.
In the present embodiment, main controller 400 adjusts Bidirectional charging-discharging according to overall discharging efficiency and current DC bus-bar voltage
Optimal dc bus ginseng voltage when the DC bus-bar voltage reference value Approach by inchmeal entirety discharging efficiency of system is maximum, modulator
500 according to the DC bus-bar voltage reference value after regulation and the overall discharging efficiency of current DC bus-bar voltage regulation, until overall
Discharging efficiency is maximum, it is ensured that the discharging efficiency of Bidirectional charging-discharging system, control device is simple to operation.
In one embodiment, main controller 400 can gradually adjust DC bus-bar voltage reference value, make DC bus-bar voltage
Reference value approaches optimal DC bus-bar voltage during overall discharging efficiency maximum.Main controller 400 can be adjusted by the way that formula is calculated as below
Optimal DC bus-bar voltage when section DC bus-bar voltage reference value Approach by inchmeal entirety discharging efficiency is maximum：
Work as Udc(k+1)>Udc(k), and η (k+1)>During η (k), Udcref(k+2)=Udcref(k+1)+Ustep。
Work as Udc(k+1)>Udc(k), and η (k+1)<During η (k), Udcref(k+2)=Udcref(k+1)-Ustep。
Work as Udc(k+1)<Udc(k), and η (k+1)>During η (k), Udcref(k+2)=Udcref(k+1)-Ustep。
Work as Udc(k+1)<Udc(k), and η (k+1)<During η (k), Udcref(k+2)=Udcref(k+1)+Ustep。
Work as Udc(k+1)=Udc(k), and during η (k+1)=η (k), Udcref(k+2)=Udcref(k+1)。
Wherein, UdcIt is DC bus-bar voltage, is cell voltage by the voltage after discharge circuit, η is overall discharging efficiency,
UdcrefIt is DC bus-bar voltage reference value, UstepIt is step-length of the DC bus-bar voltage with reference to value changes, k is positive integer, expression kth
The individual cycle.
Specifically, Fig. 3 can be referred to, Fig. 3 is DC bus-bar voltage-efficiency curve diagram in an embodiment.If correspondence at A points
DC bus-bar voltage be current DC bus-bar voltage Udc, by above-mentioned formula, U can be designated asdc(k+1), correspondence is overall at A points puts
Electrical efficiency is η (k+1), and correspondence DC bus-bar voltage is the DC bus-bar voltage U of preceding Primary regulation at B pointsdc, by above-mentioned formula,
U can be designated asdcK (), correspondence entirety discharging efficiency is η (k), now, U at B pointsdc(k+1)>Udc(k), and η (k+1)>η (k), then
DC bus-bar voltage reference value U after regulationdcref(k+2) it is current DC bus-bar voltage reference value Udcref(k+1) add direct current female
Line voltage incrementally increases DC bus-bar voltage reference value with reference to the step-length of value changes, makes the DC bus-bar voltage reference value can be with
The optimal DC bus-bar voltage more approached at overall discharging efficiency optimum point.
If the corresponding DC bus-bar voltage of B points is current DC bus-bar voltage Udc, by above-mentioned formula, U can be designated asdc(k+
1), correspondence entirety discharging efficiency is η (k+1) at B points, and correspondence DC bus-bar voltage is the dc bus of preceding Primary regulation at A points
Voltage Udc, by above-mentioned formula, U can be designated asdcK (), correspondence entirety discharging efficiency is η (k), now, U at A pointsdc(k+1)<Udc
(k), and η (k+1)<η (k), then the DC bus-bar voltage reference value U after adjustingdcref(k+2) for current DC bus-bar voltage is referred to
Value Udcref(k+1) add DC bus-bar voltage with reference to the step-length of value changes, that is, incrementally increase DC bus-bar voltage reference value, make direct current
The optimal DC bus-bar voltage that busbar voltage reference value can be approached more at overall discharging efficiency optimum point.
With continued reference to Fig. 3, if corresponding DC bus-bar voltage is current DC bus-bar voltage U at C pointsdc, by above-mentioned formula,
U can be designated asdc(k+1), correspondence entirety discharging efficiency is η (k+1) at C points, and correspondence DC bus-bar voltage is preceding Primary regulation at D points
DC bus-bar voltage Udc, by above-mentioned formula, U can be designated asdcK (), correspondence entirety discharging efficiency is η (k), now, U at D pointsdc
(k+1)>Udc(k), and η (k+1)<η (k), then the DC bus-bar voltage reference value U after adjustingdcref(k+2) for current direct current is female
Line voltage reference value Udcref(k+1) step-length of the DC bus-bar voltage with reference to value changes is subtracted, i.e., progressively reduces DC bus-bar voltage
Reference value, allows the optimal dc bus electricity that DC bus-bar voltage reference value is more approached at overall discharging efficiency optimum point
Pressure.
If corresponding DC bus-bar voltage is current DC bus-bar voltage U at D pointsdc, by above-mentioned formula, U can be designated asdc(k+
1), correspondence entirety discharging efficiency is η (k+1) at D points, and correspondence DC bus-bar voltage is the dc bus of preceding Primary regulation at C points
Voltage Udc, by above-mentioned formula, U can be designated asdcK (), correspondence entirety discharging efficiency is η (k), now, U at C pointsdc(k+1)<Udc
(k), and η (k+1)>η (k), then the DC bus-bar voltage reference value U after adjustingdcref(k+2) for current DC bus-bar voltage is referred to
Value Udcref(k+1) step-length of the DC bus-bar voltage with reference to value changes is subtracted, i.e., progressively reduces DC bus-bar voltage reference value, made straight
The optimal DC bus-bar voltage that stream busbar voltage reference value can be approached more at overall discharging efficiency optimum point.
In above-described embodiment, approached at overall discharging efficiency optimum point using progressively regulation DC bus-bar voltage reference value
Optimal DC bus-bar voltage, regulation process is accurate, and operation is simple.
In one embodiment, DC bus-bar voltage can be the rated value of DC bus-bar voltage with reference to the step-length of value changes
1%-2%, when overall discharging efficiency is maximum, the rated value of DC bus-bar voltage can be the voltage rating of battery, directly
Stream busbar voltage is the 1%-2% of the voltage rating of battery, specifically, DC bus-bar voltage with reference to the step-length of value changes
Rated value can be 12V, 24V, 48V etc..For example, when the rated value of DC bus-bar voltage is 12V, the volume of DC bus-bar voltage
Between the 1%-2% of definite value, i.e. 0.12V-0.24V, thus DC bus-bar voltage with reference to value changes step-length can for 0.12V,
0.15V, 0.2V, 0.22V, 0.24V etc..When the rated value of DC bus-bar voltage is 24V, the rated value of DC bus-bar voltage
Between 1%-2%, i.e. 0.24V-0.48V, thus DC bus-bar voltage with reference to value changes step-length can for 0.24V, 0.26V,
0.32V, 0.36V, 0.48V etc..When the rated value of DC bus-bar voltage is 48V, the 1%- of the rated value of DC bus-bar voltage
Between 2%, i.e. 0.48V-0.96V, thus DC bus-bar voltage with reference to value changes step-length can for 0.48V, 0.58V,
0.63V, 0.74V, 0.87V, 0.96V etc..It should be noted that the rated value not limited to this of above-mentioned DC bus-bar voltage, can be with
Multiple choices are carried out according to actually used, the 1%-2% for selecting the rated value of DC bus-bar voltage joins as DC bus-bar voltage
The step-length of value changes is examined, adjusts simple to operation, and regulation is accurate.
In one embodiment, reference picture 4, modulator 500 includes adder 510, PI (Proportional-
Integral, proportional, integral) adjuster 520, phaselocked loop 530, electric current loop 540, SPWM (Sinusoidal Pulse Width
Modulation, sinusoidal pulse width modulation) generator 550.Pi regulator 520 is connected with the output end of adder 510, phaselocked loop
530 are connected with pi regulator 520, and electric current loop 540 is connected with phaselocked loop 530, the input and electric current loop of SPWM generators 550
540 are connected, and the output end of SPWM generators 550 is connected with discharge circuit.
Adder 510 passes through current DC bus-bar voltage UdcWith the DC bus-bar voltage reference value U after regulationdcrefCalculate
Obtain the first error signal；Pi regulator 520 is by the first error signal by generating given electric current I after ratio, integral operationp,
The given electric current of the locking of phaselocked loop 530 obtains the phase angle signal of voltage signal, and phase angle signal is input into respective converter obtains
Corresponding current component, then the given electric current I that the corresponding current component that will be obtained is obtained with pi regulator 520pBy shape after computing
Into the second error signal, electric current loop 540 obtains the given electric current I for obtaining corresponding current component and pi regulator 520pThrough computing
The second error signal for being formed afterwards obtains voltage control signal Uac、, according to voltage control signal Uac, SPWM generators 550 generate
PWM (Pulse Width Modulation, pulsewidth modulation) control signal, pwm control signal is exported to discharge circuit 130,
The discharging efficiency of discharge circuit 130 is adjusted by pwm control signal, the power of the output of discharge circuit 130 changes, so as to work as
Preceding DC bus-bar voltage UdcAlso change, the discharging efficiency of single-phase full bridge converter 110 follows the change of DC bus-bar voltage
Change, and then overall discharging efficiency changes.After overall discharging efficiency changes, current DC bus-bar voltage U is reacquireddc
With overall discharging efficiency, above-mentioned regulation process is repeated, realize the overall discharging efficiency of regulation, control device is simple and easy to apply.
Further, Fig. 4 is see, pwm control signal is generated in SPWM generators 550, pwm control signal is exported to double
To the discharge circuit 130 in charge-discharge system 100, the discharging efficiency of discharge circuit 130 is adjusted by PWM control signal
η2, the discharging efficiency η of discharge circuit 1302Change, current DC bus-bar voltage UdcAlso can change, then single-phase full bridge
The discharging efficiency η of converter 1101Change, because the discharging efficiency η of integrated circuit can use single-phase full bridge converter 110
Discharging efficiency η1With the discharging efficiency η of discharge circuit 1302Product representation, and single-phase full bridge converter 110 discharging efficiency
η1With the discharging efficiency η of discharge circuit 1302All change, then whole efficiency η can also change, with current dc bus
Voltage UdcThere is efficiency optimization point in change, overall discharging efficiency η, adjust process simple possible, and control device is simple, it is ensured that
The discharging efficiency of Bidirectional charging-discharging system 100 is in optimum state, realizes the lifting of overall discharging efficiency.
In one embodiment, main controller can calculate the overall electric discharge effect of Bidirectional charging-discharging system by below equation
Rate：
Wherein, P1It is exchange average active power, P2It is direct current average active power, η is overall discharging efficiency.Further
Ground, overall discharging efficiency η can also be the discharging efficiency η of single-phase full bridge converter1With the discharging efficiency η of discharge circuit2Multiply
Product, overall discharging efficiency computational methods are simple, calculate accurate.
A kind of reference picture 5, there is provided Bidirectional charging-discharging system control method, in the present embodiment, the method can be included such as
Lower step：
S402：Obtain exchange average active power and direct current average active power in Bidirectional charging-discharging system.
Specifically, the direct current active power of Bidirectional charging-discharging system can be got by the first power checker, is passed through
Second power checker gets the exchange average active power of Bidirectional charging-discharging system.
S404：Put according to the entirety that exchange average active power and direct current average active power calculate Bidirectional charging-discharging system
Electrical efficiency.
Specifically, discharging efficiency can be operated under electric discharge operating mode by Bidirectional charging-discharging system, worked by way circuit
Operating power afterwards is calculated with the ratio of rated operating power, and exchange average active power is considered as being through oversampling circuit work
Operating power after work, under electric discharge operating mode, to power network end input energy, then rated operating power is considered as direct current and puts down battery-end
Equal active power.
S406：The current DC bus-bar voltage of Bidirectional charging-discharging system is obtained, current DC bus-bar voltage is cell voltage
By the voltage after discharge circuit.
Specifically, the current DC bus-bar voltage of Bidirectional charging-discharging system can be obtained by main controller.
S408：According to overall discharging efficiency and current DC bus-bar voltage, the dc bus of Bidirectional charging-discharging system is adjusted
Optimal DC bus-bar voltage when voltage reference value Approach by inchmeal entirety discharging efficiency is maximum.
Specifically, DC bus-bar voltage reference value can be gradually adjusted in main controller, makes DC bus-bar voltage reference value
Optimal DC bus-bar voltage is obtained when approaching overall discharging efficiency maximum.
S410：According to DC bus-bar voltage reference value and current DC bus-bar voltage after regulation, the overall electric discharge effect of regulation
Rate, until overall discharging efficiency is maximum.
Specifically, according to the DC bus-bar voltage reference value after regulation and the overall electric discharge effect of current DC bus-bar voltage regulation
Rate, and then adjust overall discharging efficiency so that the power of discharge circuit output changes, so that change current DC bus-bar voltage,
And then the discharging efficiency of single-phase full bridge converter changes, then overall discharging efficiency can be adjusted, continue to repeat whole regulation process,
Adjusting body discharging efficiency is to maximum.
In the present embodiment, according to overall discharging efficiency and current DC bus-bar voltage, the straight of Bidirectional charging-discharging system is adjusted
Optimal DC bus-bar voltage when stream busbar voltage reference value Approach by inchmeal entirety discharging efficiency is maximum, such that it is able to according to regulation
DC bus-bar voltage reference value afterwards and the overall discharging efficiency of current DC bus-bar voltage regulation, repeat said process, until whole
Body discharging efficiency is maximum, it is ensured that the discharging efficiency of Bidirectional charging-discharging system, and control process is simple, and range of application is relatively broad.
In one embodiment, above-mentioned S402 steps are specifically included：
First, the direct current average active power of Bidirectional charging-discharging system is obtained by the first power checker.Wherein, first
Power checker can use diode power device, Hall effect power device etc., the first power checker and Bidirectional charging-discharging system
DC terminal be connected, the voltage and electric current at Bidirectional charging-discharging system dc end are obtained by the first power checker, and will obtain
To voltage and electric current be converted into direct current average active power；
Afterwards, the exchange average active power of Bidirectional charging-discharging system is obtained by the second power checker, wherein, second
Power checker can use diode power device, Hall effect power device etc., the second power checker and Bidirectional charging-discharging system
Exchange end be connected.Voltage and electric current that Bidirectional charging-discharging system exchanges end are obtained by the second power checker, and will be obtained
To voltage be converted into electric current and exchange average active power.
Exchange average active power and direct current average active power, the simple essence of measurement are directly obtained using power checker
Really.
In one embodiment, above-mentioned S404 steps are specially：By main controller acquisition exchange average active power and directly
Stream average active power, the overall discharging efficiency of Bidirectional charging-discharging system is calculated by below equation：
Wherein, P1It is exchange average active power, P2It is direct current average active power, η is overall discharging efficiency.This implementation
In example, overall discharging efficiency can be the discharging efficiency η of single-phase full bridge converter1With the discharging efficiency η of discharge circuit2Product,
Overall discharging efficiency computational methods are simple, calculate accurate.
In one embodiment, above-mentioned S408 steps are specially：DC bus-bar voltage can be gradually adjusted in main controller
Reference value, makes DC bus-bar voltage reference value obtain optimal DC bus-bar voltage when approaching overall discharging efficiency maximum, using as follows
Calculating formula is adjusted：
If Udc(k+1)>Udc(k), and η (k+1)>η (k), then Udcref(k+2)=Udcref(k+1)+Ustep。
If Udc(k+1)>Udc(k), and η (k+1)<η (k), then Udcref(k+2)=Udcref(k+1)-Ustep。
If Udc(k+1)<Udc(k), and η (k+1)>η (k), then Udcref(k+2)=Udcref(k+1)-Ustep。
If Udc(k+1)<Udc(k), and η (k+1)<η (k), then Udcref(k+2)=Udcref(k+1)+Ustep。
If Udc(k+1)=Udc(k), and η (k+1)=η (k), then Udcref(k+2)=Udcref(k+1)。
Wherein, UdcIt is current DC bus-bar voltage, η is overall discharging efficiency, UdcrefIt is DC bus-bar voltage reference value,
UstepIt is step-length of the DC bus-bar voltage with reference to value changes, k is positive integer, k-th cycle of expression.
Specifically, can be referring again to Fig. 3, if corresponding DC bus-bar voltage is current DC bus-bar voltage U at A pointsdc,
By above-mentioned formula, U can be designated asdc(k+1), correspondence entirety discharging efficiency is η (k+1) at A points, correspondence DC bus-bar voltage at B points
It is the DC bus-bar voltage U of preceding Primary regulationdc, by above-mentioned formula, U can be designated asdcK (), correspondence entirety discharging efficiency is η at B points
(k), now, Udc(k+1)>Udc(k), and η (k+1)>η (k), then the DC bus-bar voltage reference value U after adjustingdcref(k+2) it is
Current DC bus-bar voltage reference value Udcref(k+1) add DC bus-bar voltage with reference to the step-length of value changes, that is, incrementally increase direct current
Busbar voltage reference value, makes the optimal dc bus electricity that DC bus-bar voltage reference value is approached at overall discharging efficiency optimum point
Pressure.
If the corresponding DC bus-bar voltage of B points is current DC bus-bar voltage Udc, by above-mentioned formula, U can be designated asdc(k+
1), correspondence entirety discharging efficiency is η (k+1) at B points, and correspondence DC bus-bar voltage is the dc bus of preceding Primary regulation at A points
Voltage Udc, by above-mentioned formula, U can be designated asdcK (), correspondence entirety discharging efficiency is η (k), now, U at A pointsdc(k+1)<Udc
(k), and η (k+1)<η (k), then the DC bus-bar voltage reference value U after adjustingdcref(k+2) for current DC bus-bar voltage is referred to
Value Udcref(k+1) add DC bus-bar voltage with reference to the step-length of value changes, that is, incrementally increase DC bus-bar voltage reference value, make direct current
The optimal DC bus-bar voltage that busbar voltage reference value is approached at overall discharging efficiency optimum point.
With continued reference to Fig. 3, if corresponding DC bus-bar voltage is current DC bus-bar voltage U at C pointsdc, by above-mentioned formula,
U can be designated asdc(k+1), correspondence entirety discharging efficiency is η (k+1) at C points, and correspondence DC bus-bar voltage is preceding Primary regulation at D points
DC bus-bar voltage Udc, by above-mentioned formula, U can be designated asdcK (), correspondence entirety discharging efficiency is η (k), now, U at D pointsdc
(k+1)>Udc(k), and η (k+1)<η (k), then the DC bus-bar voltage reference value U after adjustingdcref(k+2) for current direct current is female
Line voltage reference value Udcref(k+1) step-length of the DC bus-bar voltage with reference to value changes is subtracted, i.e., progressively reduces DC bus-bar voltage
Reference value, the optimal DC bus-bar voltage for making DC bus-bar voltage reference value approach at overall discharging efficiency optimum point.
If corresponding DC bus-bar voltage is current DC bus-bar voltage U at D pointsdc, by above-mentioned formula, U can be designated asdc(k+
1), correspondence entirety discharging efficiency is η (k+1) at D points, and correspondence DC bus-bar voltage is the dc bus of preceding Primary regulation at C points
Voltage Udc, by above-mentioned formula, U can be designated asdcK (), correspondence entirety discharging efficiency is η (k), now, U at C pointsdc(k+1)<Udc
(k), and η (k+1)>η (k), then the DC bus-bar voltage reference value U after adjustingdcref(k+2) for current DC bus-bar voltage is referred to
Value Udcref(k+1) step-length of the DC bus-bar voltage with reference to value changes is subtracted, i.e., progressively reduces DC bus-bar voltage reference value, made straight
The optimal DC bus-bar voltage that stream busbar voltage reference value is approached at overall discharging efficiency optimum point.It is female using progressively regulation direct current
The optimal DC bus-bar voltage that line voltage reference value is approached at overall discharging efficiency optimum point, it is simple to operate, using Approach by inchmeal
Method regulation, as a result accurately.
In one embodiment, DC bus-bar voltage can be the rated value of DC bus-bar voltage with reference to the step-length of value changes
1%-2%, when overall discharging efficiency is maximum, the rated value of DC bus-bar voltage can be the rated value of cell voltage, directly
Stream busbar voltage is the 1%-2% of the voltage rating of battery with reference to the step-length of value changes.For example, when DC bus-bar voltage
When rated value is 12V, between the 1%-2% of the rated value of DC bus-bar voltage, i.e. 0.12V-0.24V, therefore dc bus electricity
Pressure can be 0.12V, 0.15V, 0.2V, 0.22V, 0.24V etc. with reference to the step-length of value changes.When the rated value of DC bus-bar voltage
During for 24V, between the 1%-2% of the rated value of DC bus-bar voltage, i.e. 0.24V-0.48V, therefore DC bus-bar voltage is referred to
The step-length of value changes can be 0.24V, 0.26V, 0.32V, 0.36V, 0.48V etc..When the rated value of DC bus-bar voltage is 48V
When, between the 1%-2% of the rated value of DC bus-bar voltage, i.e. 0.48V-0.96V, therefore DC bus-bar voltage refers to value changes
Step-length can be for 0.48V, 0.58V, 0.63V, 0.74V, 0.87V, 0.96V etc..It should be noted that above-mentioned dc bus electricity
The rated value not limited to this of pressure, can carry out multiple choices according to actually used, select the rated value of DC bus-bar voltage
1%-2%, with reference to the step-length of value changes, adjusts simple to operation as DC bus-bar voltage, and regulation is accurate.
In one embodiment, above-mentioned S410 steps are specially：Direct current after current DC bus-bar voltage with regulation
Busbar voltage reference value is calculated the first error signal in adder；First error signal is compared by pi regulator
The given electric current of generation after example, integral operation；Given electric current obtains the phase angle signal of voltage signal, the phase that will be obtained by phaselocked loop
Angle signal be input to corresponding converter to corresponding current component, by current component with given electric current by forming after computing
Two error signals；Voltage control signal is obtained according to the second error signal in electric current loop；According to voltage control signal, in SPWM
Pwm control signal is generated in generator, pwm control signal is exported to discharge circuit, electric discharge electricity is adjusted by pwm control signal
The discharging efficiency on road, the power of discharge circuit output can change, so that current DC bus-bar voltage also changes, it is single-phase
The discharging efficiency of full-bridge converter follows the change of DC bus-bar voltage to change, and then overall discharging efficiency changes, when whole
After body discharging efficiency changes, current DC bus-bar voltage U is reacquireddcWith overall discharging efficiency, continue re-adjustments process, i.e.,
Can by adjust the discharging efficiency of discharge circuit and adjusting body discharging efficiency.
Further, Fig. 3 is see according to overall discharging efficiency and current DC bus-bar voltage, regulation Bidirectional charging-discharging system
Optimal DC bus-bar voltage when the DC bus-bar voltage reference value Approach by inchmeal entirety discharging efficiency of system is maximum, through what is overregulated
DC bus-bar voltage reference value can generate pwm control signal, pwm control signal in the SPWM generators in positioned at modulator
Output adjusts the discharging efficiency η of discharge circuit by PWM control signal to discharge circuit2, the electric discharge of discharge circuit 130
Efficiency eta2Change, current DC bus-bar voltage can also change, then the discharging efficiency η of single-phase full bridge converter1Become
Change, because the discharging efficiency η of integrated circuit can also use the discharging efficiency η of discharge circuit2Electric discharge with single-phase full bridge converter is imitated
Rate η1Product representation, and single-phase full bridge converter 110 discharging efficiency η1With the discharging efficiency η of discharge circuit 1302All occur
Change, then the discharging efficiency η of integrated circuit can also change, as current DC bus-bar voltage changes, overall discharging efficiency η
There is efficiency optimization point, adjust process simple possible, it is ensured that the discharging efficiency of Bidirectional charging-discharging system is in optimum state,
Realize the lifting of overall discharging efficiency.
Each technical characteristic of above example can be combined arbitrarily, to make description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics do not exist lance
Shield, is all considered to be the scope of this specification record.
Above example only expresses several embodiments of the invention, and its description is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art,
On the premise of not departing from present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.
Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of Bidirectional charging-discharging system control method, it is characterised in that comprise the following steps：
Obtain exchange average active power and direct current average active power in Bidirectional charging-discharging system；
The whole of the Bidirectional charging-discharging system is calculated according to the exchange average active power and the direct current average active power
Body discharging efficiency；
The current DC bus-bar voltage of the Bidirectional charging-discharging system is obtained, the current DC bus-bar voltage is passed through for cell voltage
Voltage after overdischarge circuit；
According to the overall discharging efficiency and the current DC bus-bar voltage, the direct current for adjusting the Bidirectional charging-discharging system is female
Optimal DC bus-bar voltage described in line voltage reference value Approach by inchmeal during overall discharging efficiency maximum；
According to the DC bus-bar voltage reference value after regulation and the current DC bus-bar voltage, the overall electric discharge effect is adjusted
Rate, until the overall discharging efficiency is maximum.
2. Bidirectional charging-discharging system control method according to claim 1, it is characterised in that described to be put according to the entirety
Electrical efficiency and the current DC bus-bar voltage, the DC bus-bar voltage reference value for adjusting the Bidirectional charging-discharging system are gradually forced
The step of optimal DC bus-bar voltage when the nearly overall discharging efficiency is maximum, including：
If Udc(k+1)>Udc(k), and η (k+1)>η (k), then Udcref(k+2)=Udcref(k+1)+Ustep；
If Udc(k+1)>Udc(k), and η (k+1)<η (k), then Udcref(k+2)=Udcref(k+1)-Ustep；
If Udc(k+1)<Udc(k), and η (k+1)>η (k), then Udcref(k+2)=Udcref(k+1)-Ustep；
If Udc(k+1)<Udc(k), and η (k+1)<η (k), then Udcref(k+2)=Udcref(k+1)+Ustep；
If Udc(k+1)=Udc(k), and η (k+1)=η (k), then Udcref(k+2)=Udcref(k+1)；
Wherein, UdcIt is the current DC bus-bar voltage, η is the overall discharging efficiency, UdcrefFor DC bus-bar voltage is referred to
Value, UstepIt is step-length of the DC bus-bar voltage with reference to value changes, k is positive integer, k-th cycle of expression.
3. Bidirectional charging-discharging system control method according to claim 2, it is characterised in that the DC bus-bar voltage ginseng
It is the 1%-2% of the rated value of DC bus-bar voltage to examine the step-length of value changes.
4. Bidirectional charging-discharging system control method according to claim 1, it is characterised in that it is described according to regulation after it is straight
Stream busbar voltage reference value and the current DC bus-bar voltage, adjust the overall discharging efficiency, until the overall electric discharge
The maximum step of efficiency, including：
Step A：Pulsewidth is generated by the DC bus-bar voltage reference value after the current DC bus-bar voltage and regulation to adjust
Control signal processed；
Step B：The discharging efficiency of the discharge circuit is adjusted by the pulse-width modulation control signal, and then adjusts the entirety
Discharging efficiency；
A and step B repeat the above steps until the overall discharging efficiency is maximum.
5. Bidirectional charging-discharging system control method according to claim 1, it is characterised in that described flat according to the exchange
The step of equal active power and the direct current average active power calculate the overall discharging efficiency of the Bidirectional charging-discharging system, bag
Include：
Wherein, P1It is the exchange average active power, P2It is the direct current average active power, η is the overall electric discharge effect
Rate.
6. a kind of Bidirectional charging-discharging control device, it is characterised in that including：
Bidirectional charging-discharging system；
First power checker, the DC terminal with the Bidirectional charging-discharging system is connected, and first power checker is used for
Measure the direct current average active power of the Bidirectional charging-discharging system；
Second power checker, the end that exchanges with the Bidirectional charging-discharging system is connected, and second power checker is used for
Measure the exchange average active power of the Bidirectional charging-discharging system；
Main controller, is connected with first power checker and second power checker respectively, and the main controller is used for
Put according to the entirety that the exchange average active power and the direct current average active power calculate the Bidirectional charging-discharging system
Electrical efficiency, and after obtaining the current DC bus-bar voltage of the Bidirectional charging-discharging system, according to the overall discharging efficiency and institute
Current DC bus-bar voltage is stated, adjusts overall described in the DC bus-bar voltage reference value Approach by inchmeal of the Bidirectional charging-discharging system
Optimal DC bus-bar voltage when discharging efficiency is maximum；
Modulator, input is connected with the main controller, and output end is connected with the Bidirectional charging-discharging system, the regulation and control
Device be used for according to regulation after the DC bus-bar voltage reference value and the current DC bus-bar voltage, adjust the entirety and put
Electrical efficiency, until the overall discharging efficiency is maximum.
7. Bidirectional charging-discharging control device according to claim 6, it is characterised in that the main controller passes through below equation
Adjust optimal DC bus-bar voltage during overall discharging efficiency maximum described in the DC bus-bar voltage reference value Approach by inchmeal：
Work as Udc(k+1)>Udc(k), and η (k+1)>During η (k), Udcref(k+2)=Udcref(k+1)+Ustep；
Work as Udc(k+1)>Udc(k), and η (k+1)<During η (k), Udcref(k+2)=Udcref(k+1)-Ustep；
Work as Udc(k+1)<Udc(k), and η (k+1)>During η (k), Udcref(k+2)=Udcref(k+1)-Ustep；
Work as Udc(k+1)<Udc(k), and η (k+1)<During η (k), Udcref(k+2)=Udcref(k+1)+Ustep；
Work as Udc(k+1)=Udc(k), and during η (k+1)=η (k), Udcref(k+2)=Udcref(k+1)；
Wherein, UdcIt is the DC bus-bar voltage, η is the overall discharging efficiency, UdcrefIt is DC bus-bar voltage reference value,
UstepIt is step-length of the DC bus-bar voltage with reference to value changes, k is positive integer, k-th cycle of expression.
8. Bidirectional charging-discharging control device according to claim 7, it is characterised in that the DC bus-bar voltage reference value
The step-length of change is the 1%-2% of the rated value of DC bus-bar voltage.
9. Bidirectional charging-discharging control device according to claim 6, it is characterised in that the main controller passes through below equation
Calculate the overall discharging efficiency of the Bidirectional charging-discharging system：
Wherein, P1It is the exchange average active power, P2It is the direct current average active power, η is the overall electric discharge effect
Rate.
10. Bidirectional charging-discharging control device according to claim 6, it is characterised in that the modulator includes：
Adder, for being calculated with the DC bus-bar voltage reference value after regulation by the current DC bus-bar voltage
To the first error signal；
Pi regulator, the output end with the adder is connected, and the pi regulator is used to be given birth to by first error signal
Into given electric current；
Phaselocked loop, is connected with the pi regulator, and the phaselocked loop is used to lock the phase of the given electric current；
Electric current loop, is connected with the phaselocked loop, and the electric current loop is used to obtain voltage control signal according to the given electric current；
SPWM generators, the control end of the SPWM generators is connected with the electric current loop, the output end of the SPWM generators
It is connected with the discharge circuit, after the SPWM generators are used to generate pwm control signal according to the voltage control signal,
Export to the discharge circuit.
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|---|---|---|---|---|
| CN108263240A (en) * | 2018-02-28 | 2018-07-10 | 深圳市鼎硕同邦科技有限公司 | Vehicle-mounted charging device for electric vehicles and its charging method |
| CN108263240B (en) * | 2018-02-28 | 2023-08-22 | 深圳市鼎硕同邦科技有限公司 | Vehicle-mounted charging device of electric automobile and charging method thereof |
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