CN108312871B - Method and system for controlling current output of power module group - Google Patents
Method and system for controlling current output of power module group Download PDFInfo
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- CN108312871B CN108312871B CN201810108337.2A CN201810108337A CN108312871B CN 108312871 B CN108312871 B CN 108312871B CN 201810108337 A CN201810108337 A CN 201810108337A CN 108312871 B CN108312871 B CN 108312871B
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- 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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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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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- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
Abstract
The invention discloses a method and a system for controlling current output of a power module group, wherein the method comprises the steps of updating the distribution quantity of power modules in real time through a monitoring unit CCU according to vehicle demand current and actual output current values of all power modules in the power module group; and determining the actually issued expected current value of the power module through the power distribution unit PDU according to the vehicle required current, the real-time updated distribution quantity of the power modules and the updated actual value of the output current of each power module. The invention effectively utilizes the power module group, meets the actual output current, matches the maximum output current capability of the power module group, avoids the overlow long-term utilization rate of the power module group, and can improve the charging efficiency under a certain number of power modules.
Description
Technical Field
The invention belongs to the technical field of electric vehicle charging, and relates to a method and a system for controlling current output of a power module group.
Background
At present, a direct current charging mode is adopted for quick charging of an electric automobile, and a power module, namely an AC/DC or DC/DC module, is an important unit for power output. At present, for a charging mode of a plurality of power modules in a parallel group, when calculating the number of power modules in parallel connection, a fixed power calculation is adopted, and it is default that the output capability of each power module is constant, for example, when a power module is allocated, it is calculated according to its rated current (assuming a rated 20A), a charging current of 150A is required, 8 power modules need to be allocated, when a power module actually outputs, the current is dynamically adjusted (in a constant power mode), that is, the current can exceed the rated current output (assuming a rated 30A) under a certain voltage, then 5 power modules are required to meet the requirement, on the contrary, the current can also be dynamically adjusted to be below the rated current (assuming a rated 15A), then if 8 power modules are allocated, 2 power modules need to be added to meet the requirement, so that in the original mode, the resource utilization rate is low or the resource allocation is insufficient, and the working efficiency of the power module is reduced.
Therefore, in the existing power module group current distribution method, the constant current interval of the power module is used as the current distribution output basis, the actual charging current is reflected to be a static quantity, and the dynamic change of the module power is ignored.
The problem in practical application is that the output current of the power module group is over-distributed, that is, the charging current demand of the electric automobile is far less than the actual distribution quantity of the charging system, so that the output capacity of the power module is wasted, and unnecessary fixed loss is increased; the output current of the power module group is not distributed enough, namely, each power module works independently, the current of each power module is dynamically regulated, the output current of each power module in the group cannot be consistent, the output capacity is not enough, and the total charging time of the electric automobile is increased.
In conclusion, the output current of the power module group is distributed unreasonably, and a small horse pulls a cart or a large horse pulls a small cart; the problems that the distribution utilization rate of the output current of the power module is low, the charging efficiency is insufficient under the same input power, the charging waiting time of the vehicle is increased and the like exist in practical application.
Disclosure of Invention
The present invention is directed to overcome the above disadvantages of the prior art, and to provide a method and a system for controlling current output of a power module group, which solve the problems of current output distribution of power modules in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for controlling current output of a power module group comprises the following steps:
updating the distribution quantity of the power modules in real time through the CCU according to the vehicle demand current and the actual output current value of each power module in the power module group;
and determining the actually issued expected current value of the power module through the power distribution unit PDU according to the vehicle required current, the real-time updated distribution quantity of the power modules and the updated actual value of the output current of each power module.
The invention further improves the following steps:
the method comprises the following steps:
step 1: acquiring the required current of the vehicle by a power distribution unit PDU (protocol data unit), and reporting the required current to a monitoring module CCU (central processing unit);
step 2: the CCU calculates a power module distribution initial value according to the vehicle demand current and sends the power module distribution initial value to the power distribution unit PDU;
and step 3: the monitoring module CCU acquires the actual value of the output current of the power modules in real time, corrects the distribution quantity of the power modules according to the actual value of the output current of each power module, and transmits the obtained distribution correction value of the power modules to the power distribution unit PDU;
and 4, step 4: the power distribution unit PDU calculates an expected current initial value of the power module according to a power module distribution correction value of the monitoring module CCU;
and 5: the power distribution unit PDU corrects the expected current value of the power module according to the actual value of the output current of the power module, and issues the corrected expected current correction value of the power module to control the current output of each power module;
step 6: and repeating the steps after the required current changes.
The specific method for controlling the current output of the power module group comprises the following steps:
step 1: the method comprises the steps that a monitoring module CCU calculates a power module distribution initial value n which is Ireq/Iavg according to obtained vehicle required current Ireq, wherein Iavg is a rated value of output current of the power module;
step 2: acquiring actual output current values of the power modules, recording the actual output current values as I1, I2, … … and In, and calculating an actual output total current value Isum:
Isum＝I1+I2+……+In (1)
step 3: calculating a first supply and demand current difference value delta I, namely the difference value of Ireq and Isum:
ΔI＝Isum–Ireq (2)
correcting the distribution quantity of the power modules according to the difference value delta I to obtain a distribution correction value n 'of the power modules, and sending the distribution correction value n' to a power distribution unit PDU;
step 4: the power distribution unit PDU calculates an initial value Igroup of the current expected by the power module according to the distribution correction value n 'of the power module, namely Igroup is Ireq/n'; acquiring corrected actual values of the output currents of the power modules, recording the actual values as I1, I2, … … and In ', calculating an actual value I' sum of the output total current:
I’sum＝I1+I2+……+In’ (3)
calculating a second supply and demand current difference value delta I ', namely the difference value between Ireq and I' sum:
ΔI’＝Ireq–I’sum
if the Δ I 'is greater than 0, iteration is needed for n' times, the expected current value of the power module is corrected, and the expected current correction value of the power module is obtained;
step 5: sorting actual values of output currents of the power modules from small to large, and performing an iterative algorithm according to the following formula (4):
Igroup`m＝(Igroup`(m-1)-`Im)/(n’-(m-1))+Igroup`(m-1) (4)
wherein m is any natural number from 1 to n ', Igroup' 0 ═ Igroup,
igroup'm-the expected current value after m iterations,
igroup' (m-1) -the expected current value after m-1 iterations,
im-m times of iteration, outputting current actual values of the mth power module in sequence from small to large;
step 6: after n ' iterations, obtaining a corrected expected current correction value Igroup ' n ' of the power module, and then sending the corrected expected current correction value Igroup ' n ' to each power module so as to control the current output of each power module in the power module group;
step 7: and repeating the steps and dynamically adjusting the expected current value of the power module.
In Step3, the specific method for obtaining the power module distribution correction value n' is as follows:
i: if Δ I ≧ Min { I1: i2: … … In, namely the power module has residual current output capability not fully utilized, the distribution quantity of the power modules is corrected to obtain a power module distribution correction value n ═ n-1;
ii: if the delta I is less than Ierr, namely the power module is not enough to support the required current output capacity, correcting the distribution quantity of the power modules to obtain a power module distribution correction value n' ═ n +1, wherein the Ierr is a preset current return difference value;
iii: otherwise the power module assigns a correction value n ═ n.
A system for controlling current output of a power module set comprises a monitoring module CCU, and a power module set and a power distribution unit set which are mutually interacted with the monitoring module CCU; a monitoring module CCU: the power distribution unit group is in communication connection with the power module group; the power module group is an energy conversion unit and comprises a plurality of power modules; the power distribution unit group is electrically connected with the power module group; wherein the content of the first and second substances,
the CCU distributes the power modules of the power module group to charge the vehicle according to the vehicle charging requirement received by the power distribution unit group; acquiring charging current of each power module;
the power module group is used for converting electric energy into charging energy of the electric automobile;
the power distribution unit group comprises a plurality of power distribution units PDU for distributing the power modules to the charging gun head/heads.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the CCU adjusts the number of the power modules in real time according to the acquired current output capability of the power module group, improves the utilization rate of the power modules and avoids being in a light load state for a long time. And the CCU optimizes the grouping strategy according to the current output capacity of the obtained power module group and the sorting according to the size of the current output capacity, and the vehicle charging waiting time is reduced on the premise of the same number of power modules. And the power distribution unit PDU adjusts the output target current value in real time according to the acquired current output capability of the matched power module, balances the current output capability of the power module and improves the effective utilization rate of the power module. The invention effectively utilizes the power module group, meets the actual output current, matches the maximum output current capability of the power module group, avoids the overlow long-term utilization rate of the power module group, and can improve the charging efficiency under a certain number of power modules.
Drawings
FIG. 1 is a system block diagram of a supervisory distribution module;
FIG. 2 is a flow chart of the monitoring module and power distribution unit control;
fig. 3 is a flow chart of a power module current allocation algorithm.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1-3, the system for controlling the current output of the power module set according to the present invention includes a monitoring module CCU, and a power module set and a power distribution unit set both interacting with the monitoring module CCU; a monitoring module CCU: the power distribution unit is in communication connection with the power module group; the power module group is an energy conversion unit and comprises a plurality of power modules; the power distribution unit group is electrically connected with the power module group; wherein the content of the first and second substances,
the CCU distributes the power modules of the power module group to charge the vehicle according to the vehicle charging requirement received by the power distribution unit group; acquiring charging current of each power module;
the power module group is used for converting electric energy into charging energy of the electric automobile;
the power distribution unit group comprises a plurality of power distribution units PDU for distributing the power modules to the charging gun head/heads.
As shown in fig. 2, the present invention also discloses a method for controlling the current output of a power module group, which comprises the following steps:
step 1: acquiring the required current of the vehicle by a power distribution unit PDU (protocol data unit), and reporting the required current to a monitoring module CCU (central processing unit);
step 2: the CCU calculates an initial value of the distribution quantity of the power modules according to the current required by the vehicle and sends the initial value to the power distribution unit PDU;
and step 3: the CCU acquires the actual value of the output current of the power modules in the group in real time, corrects the distribution quantity of the power modules according to the actual current value of each power module, and sends the corrected quantity value (namely the distribution corrected value of the power modules) to the power distribution unit PDU;
and 4, step 4: the power distribution unit PDU calculates an expected current initial value of the power modules in the group according to the distribution correction quantity value of the monitoring module CCU;
and 5: the power distribution unit PDU corrects the expected current value of the power module according to the actual current value of the power module in the group, and issues the corrected expected current value of the power module in the group (namely the corrected expected current value of the power module), and controls the current output of each power module;
step 6: and repeating the steps after the required current changes.
As shown in fig. 3, a specific method for controlling the current output of the power module group is as follows:
step 1: the method comprises the steps that a monitoring module CCU calculates a power module distribution initial value n which is Ireq/Iavg according to obtained vehicle required current Ireq, wherein Iavg is a rated value of output current of the power module;
step 2: acquiring actual output current values of the power modules, recording the actual output current values as I1, I2, … … and In, and calculating an actual output total current value Isum:
Isum＝I1+I2+……+In (1)
step 3: calculating a first supply and demand current difference value delta I, namely the difference value of Ireq and Isum:
ΔI＝Isum–Ireq (2)
correcting the distribution quantity of the power modules according to the difference value delta I to obtain a distribution correction value n 'of the power modules, and sending the distribution correction value n' to a power distribution unit PDU;
the specific method for obtaining the distribution correction value n' of the power module is as follows:
i: if Δ I ≧ Min { I1: i2: … … In, namely the power module has residual current output capability not fully utilized, the distribution quantity of the power modules is corrected to obtain a power module distribution correction value n ═ n-1;
ii: if the delta I is less than Ierr, namely the power module is not enough to support the required current output capacity, correcting the distribution quantity of the power modules to obtain a power module distribution correction value n' ═ n +1, wherein the Ierr is a preset current return difference value;
iii: otherwise the power module assigns a correction value n ═ n.
Step 4: the power distribution unit PDU calculates an initial value Igroup of the current expected by the power module according to the distribution correction value n 'of the power module, namely Igroup is Ireq/n'; acquiring corrected actual values of the output currents of the power modules, recording the actual values as I1, I2, … … and In ', calculating an actual value I' sum of the output total current:
I’sum＝I1+I2+……+In’ (3)
calculating a second supply and demand current difference value delta I ', namely the difference value between Ireq and I' sum:
ΔI’＝Ireq–I’sum
if the Δ I 'is greater than 0, iteration is needed for n' times, the expected current value of the power module is corrected, and the expected current correction value of the power module is obtained;
step 5: sorting actual values of output currents of the power modules from small to large, and performing an iterative algorithm according to the following formula (4):
Igroup`m＝(Igroup`(m-1)-`Im)/(n’-(m-1))+Igroup`(m-1) (4)
wherein m is any natural number from 1 to n ', Igroup' 0 ═ Igroup,
igroup'm-the expected current value after m iterations,
igroup' (m-1) -the expected current value after m-1 iterations,
im-m times of iteration, outputting current actual values of the mth power module in sequence from small to large;
step 6: after n ' iterations, obtaining a corrected expected current correction value Igroup ' n ' of the power module, and then sending the corrected expected current correction value Igroup ' n ' to each power module so as to control the current output of each power module in the power module group;
step 7: and repeating the steps and dynamically adjusting the expected current value of the power module.
According to the invention, the CCU adjusts the number of the power modules in real time according to the acquired current output capability of the power module group, improves the utilization rate of the power modules and avoids being in a light load state for a long time. And the CCU optimizes the grouping strategy according to the current output capacity of the obtained power module group and the sorting according to the size of the current output capacity, and the vehicle charging waiting time is reduced on the premise of the same number of power modules. And the power distribution unit PDU adjusts the output target current value in real time according to the acquired current output capability of the matched power module, balances the current output capability of the power module and improves the effective utilization rate of the power module.
If the current output capacity of the power module is not limited, the power module is preferentially distributed to the power distribution module PDU with high charging demand priority, and if the current output capacity of the power module is limited, the power module PDU with low charging demand priority is preferentially distributed.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (5)
1. A method for controlling current output of a power module group is characterized by comprising the following steps:
the CCU corrects the distribution quantity of the power modules according to the vehicle demand current and the actual output current value of each power module in the power module group, and transmits the obtained distribution correction value of the power modules to the power distribution unit PDU;
the power distribution unit PDU corrects the expected current value of the power module; specifically, the power distribution unit PDU determines the actually issued expected current value of the power module according to the current demanded by the vehicle, the distribution correction value of the power module, and the updated actual value of the output current of each power module.
2. The method for controlling the current output of a power module set according to claim 1, comprising the steps of:
step 1: acquiring the required current of the vehicle by a power distribution unit PDU (protocol data unit), and reporting the required current to a monitoring unit CCU (central processing unit);
step 2: the CCU calculates a power module distribution initial value according to the vehicle demand current and sends the power module distribution initial value to the power distribution unit PDU;
and step 3: the CCU acquires the actual value of the output current of the power modules in real time, corrects the distribution quantity of the power modules according to the actual value of the output current of each power module, and transmits the obtained distribution correction value of the power modules to the PDU;
and 4, step 4: the power distribution unit PDU calculates an expected current initial value of the power module according to the power module distribution correction value of the monitoring unit CCU;
and 5: the power distribution unit PDU corrects the expected current value of the power module according to the actual value of the output current of the power module, and issues the corrected expected current correction value of the power module to control the current output of each power module;
step 6: and repeating the steps after the required current changes.
3. The method for controlling the current output of the power module group according to claim 2, wherein the specific method for controlling the current output of the power module group is as follows:
step 1: the method comprises the steps that a monitoring unit CCU calculates a power module distribution initial value n to be Ireq/Iavg according to obtained vehicle required current Ireq, wherein n is a natural number, and Iavg is a rated value of power module output current;
step 2: acquiring actual output current values of the power modules, recording the actual output current values as I1, I2, … … and In, and calculating an actual output total current value Isum:
Isum＝I1+I2+……+In (1)
step 3: calculating a first supply and demand current difference value delta I, namely the difference value of Ireq and Isum:
ΔI＝Isum–Ireq (2)
correcting the distribution quantity of the power modules according to the difference value delta I to obtain a distribution correction value n 'of the power modules, and sending the distribution correction value n' to a power distribution unit PDU;
step 4: the power distribution unit PDU calculates an initial value Igroup of the current expected by the power module according to the distribution correction value n 'of the power module, namely Igroup is Ireq/n'; acquiring corrected actual values of the output currents of the power modules, recording the actual values as I1, I2, … … and In ', calculating an actual value I' sum of the output total current:
I’sum＝I1+I2+……+In’ (3)
calculating a second supply and demand current difference value delta I ', namely the difference value between Ireq and I' sum:
ΔI’＝Ireq–I’sum
if the Δ I 'is greater than 0, iteration is needed for n' times, the expected current value of the power module is corrected, and the expected current correction value of the power module is obtained;
step 5: sorting actual values of output currents of the power modules from small to large, and performing an iterative algorithm according to the following formula (4):
Igroup`m＝(Igroup`(m-1)-`Im)/(n’-(m-1))+Igroup`(m-1) (4)
wherein m is any natural number from 1 to n ', Igroup' 0 ═ Igroup,
igroup'm-the expected current value after m iterations,
igroup' (m-1) -the expected current value after m-1 iterations,
im-m times of iteration, outputting current actual values of the mth power module in sequence from small to large;
step 6: after n ' iterations, obtaining a corrected expected current correction value Igroup ' n ' of the power module, and then sending the corrected expected current correction value Igroup ' n ' to each power module so as to control the current output of each power module in the power module group;
step 7: and repeating the steps and dynamically adjusting the expected current value of the power module.
4. The method for controlling the current output of a power module set according to claim 3, wherein in Step3, the specific method for obtaining the power module distribution correction value n' is as follows:
i: if Δ I ≧ Min { I1: i2: … … In, namely the power module has residual current output capability not fully utilized, the distribution quantity of the power modules is corrected to obtain a power module distribution correction value n ═ n-1;
ii: if the delta I is less than Ierr, namely the power module is not enough to support the required current output capacity, correcting the distribution quantity of the power modules to obtain a power module distribution correction value n' ═ n +1, wherein the Ierr is a preset current return difference value;
iii: otherwise the power module assigns a correction value n ═ n.
5. A system for controlling the current output of a set of power modules for use in the method of any one of claims 1 to 4, comprising a monitoring unit CCU, and a set of power modules and a set of power distribution units, both interacting with the monitoring unit CCU; monitoring unit CCU: the power distribution unit group is in communication connection with the power module group; the power module group is an energy conversion unit and comprises a plurality of power modules; the power distribution unit group is electrically connected with the power module group; wherein the content of the first and second substances,
the monitoring unit CCU distributes the power modules of the power module group to charge the vehicle according to the vehicle charging requirement received by the power distribution unit group; acquiring charging current of each power module;
the power module group is used for converting electric energy into charging energy of the electric automobile;
the power distribution unit group comprises a plurality of power distribution units PDU for distributing the power modules to the charging gun head/heads.
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| CN109878367B (en) * | 2019-03-22 | 2020-11-24 | 恒大智慧充电科技有限公司 | Charging regulation method, computer device, storage medium and computer program product |
| CN110562066B (en) * | 2019-08-07 | 2023-06-13 | 国创移动能源创新中心(江苏)有限公司 | Charging pile efficiency optimal module scheduling method |
| CN113815466B (en) * | 2021-11-03 | 2023-08-11 | 阳光电源股份有限公司 | Charging pile output control method and device |
| CN115276191B (en) * | 2022-09-26 | 2023-01-03 | 西安特来电智能充电科技有限公司 | Power distribution method, device, equipment and medium |
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