CN113659595A - Three-phase balance control method and device of alternating current charging system - Google Patents
Three-phase balance control method and device of alternating current charging system Download PDFInfo
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
- Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
- Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
- Y04S30/12—Remote or cooperative charging
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Abstract
The invention relates to the technical field of charging control, and provides a three-phase balance control method and a three-phase balance control device for an alternating current charging system, aiming at solving the problem of three-phase imbalance in the alternating current charging system, wherein in the alternating current charging system, each phase line of a three-phase power distribution network is provided with N charging terminals which correspond to the phase line, and in addition, N-3N charging terminals are respectively connected to the three phase lines through corresponding phase change switches, and the method comprises the following steps: acquiring the working state of each charging terminal, and acquiring the working current and the connected phase line of the charging terminal in the charging state; acquiring electrical parameters of a three-phase power distribution network; calculating the three-phase unbalance degree of the three-phase power distribution network according to the electrical parameters of the three-phase power distribution network; judging whether the three-phase unbalance degree of the three-phase power distribution network is greater than a set threshold value or not; and if the three-phase unbalance degree of the three-phase power distribution network is greater than the set threshold, executing an adjusting scheme to adjust the state of at least one group of phase change switches so that the corresponding charging terminals switch the connected phase lines.
Description
Technical Field
The invention relates to the technical field of charging control, in particular to a three-phase balance control method and a three-phase balance control device of an alternating current charging system.
Background
With the development of new energy technology, the number of electric vehicles is rapidly increasing, and one master and multiple slaves of an alternating current charging system are in charge. The charging load of the electric automobile is generally a single-phase load, and in the actual use process, a user generally randomly selects an alternating-current charging pile to use, so that the problem of three-phase imbalance is prominent.
Disclosure of Invention
The present invention provides a method and an apparatus for controlling three-phase balance of an ac charging system, which can save cost and improve reliability of the ac charging system, and can reduce the amount of calculation of three-phase balance control, thereby quickly and effectively implementing three-phase balance of the ac charging system.
The technical scheme adopted by the invention is as follows:
the utility model provides a three-phase balance control method of AC charging system, AC charging system includes three-phase distribution network and N charging terminal, each phase line of three-phase distribution network all has corresponding N charging terminal to be connected to this phase line so that get the electricity with this phase line switch-on, N-3N charging terminal is connected to three phase line so that get the electricity according to the state of commutation switch and arbitrary phase line switch-on in the three phase line respectively in addition, wherein, N and N are positive integer, N is the integral multiple of 3 and N > 3N, and the value basis of N is: when at most n charging terminals are connected with the same phase line and work with rated current, and the other two phase lines are in no-load, the three-phase unbalance degree of the three-phase power distribution network is not greater than a set threshold value, and the three-phase balance control method comprises the following steps: acquiring the working state of each charging terminal, and acquiring the working current and the connected phase line of the charging terminal in the charging state; acquiring electrical parameters of the three-phase power distribution network; when the working state of a charging terminal changes, the working current of the charging terminal in the charging state changes or a phase line connected with the charging terminal in the charging state changes, calculating the three-phase unbalance degree of the three-phase power distribution network according to the electric parameters of the three-phase power distribution network; judging whether the three-phase unbalance of the three-phase power distribution network is greater than the set threshold value or not; and if the three-phase unbalance degree of the three-phase power distribution network is greater than the set threshold, executing an adjusting scheme to adjust the state of at least one group of phase change switches, so that the corresponding charging terminals switch the connected phase lines, and the three-phase unbalance degree of the three-phase power distribution network is reduced.
The electrical parameter of the three-phase power distribution network is the current of each phase line in the three-phase power distribution network.
Wherein the executed adjustment scheme minimizes a three-phase imbalance of the three-phase power distribution network.
The implemented regulation scheme minimizes the number of phase change switches regulated on the premise of minimizing the three-phase imbalance of the three-phase power distribution network.
On the premise that the three-phase unbalance degree of the three-phase power distribution network is minimum and the number of the adjusted phase change switches is minimum, the executed adjustment scheme enables the number of charging terminals of key users in the charging terminals for switching the connected phase lines to be minimum.
The utility model provides an alternating current charging system's three-phase balance control device, alternating current charging system includes three-phase distribution network and a N charging terminal, each phase line of three-phase distribution network all has a corresponding N charging terminal to be connected to this phase line so that get the electricity with this phase line switch-on, and a N-3N charging terminal is connected to three phase line so that according to through corresponding commutation switch respectively the state of commutation switch and arbitrary phase line switch-on in the three phase line get the electricity, and wherein, N and N are positive integer, N are the integral multiple and N > 3N of 3, and the value basis of N is: when at most n charging terminals are connected with the same phase line and work with rated current, and the other two phase lines are in no load, the three-phase unbalance degree of the three-phase power distribution network is not more than a set threshold value, and the three-phase balance control device comprises: the first acquisition module is used for acquiring the working state of each charging terminal and acquiring the working current of the charging terminal in the charging state and the connected phase line; the second acquisition module is used for acquiring the electrical parameters of the three-phase power distribution network; the calculation module is used for calculating the three-phase unbalance degree of the three-phase power distribution network according to the electrical parameters of the three-phase power distribution network when the working state of a charging terminal changes, the working current of the charging terminal in the charging state changes or the phase line connected with the charging terminal in the charging state changes; the judging module is used for judging whether the three-phase unbalance of the three-phase power distribution network is greater than the set threshold value or not; and the adjusting module is used for executing an adjusting scheme when the three-phase unbalance of the three-phase power distribution network is greater than the set threshold value so as to adjust the state of at least one group of phase change switches and enable the corresponding charging terminals to switch the connected phase lines, so that the three-phase unbalance of the three-phase power distribution network is reduced.
The electrical parameter of the three-phase power distribution network is the current of each phase line in the three-phase power distribution network.
The adjusting scheme executed by the adjusting module enables the three-phase unbalance degree of the three-phase power distribution network to be minimum.
On the premise that the three-phase unbalance degree of the three-phase power distribution network is minimum, the number of the phase change switches is minimum through the adjusting scheme executed by the adjusting module.
On the premise that the three-phase unbalance degree of the three-phase power distribution network is minimum and the number of the adjusted phase change switches is minimum, the adjusting scheme executed by the adjusting module enables the number of charging terminals of key users in the charging terminals for switching the connected phase lines to be minimum.
The invention has the beneficial effects that:
the invention aims at an alternating current charging system with partial charging terminals not provided with phase change switches, firstly, the working state of each charging terminal, the working current of the charging terminal in the charging state and the connected phase line are obtained, the electrical parameters of a three-phase power distribution network are obtained, then the three-phase unbalance of the three-phase power distribution network is calculated according to the obtained information, when the three-phase unbalance of the three-phase power distribution network is larger, the corresponding charging terminal switches the connected phase line by adjusting the state of the phase change switch, so as to reduce the three-phase unbalance of the three-phase power distribution network, therefore, 3n groups of phase change switches are reduced, on one hand, the cost can be saved, the reliability of the alternating current charging system is improved, on the other hand, the calculated amount of three-phase balance control can be reduced, and the three-phase balance of the alternating current charging system can be quickly and effectively realized.
Drawings
Fig. 1 is a schematic structural diagram of an ac charging system according to an embodiment of the present invention;
fig. 2 is a flowchart of a three-phase balance control method of an ac charging system according to an embodiment of the present invention;
fig. 3 is a flowchart of a three-phase balance control method of an ac charging system according to an embodiment of the present invention;
fig. 4 is a block diagram of a three-phase balance control device of an ac charging system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, as shown in fig. 1, the ac charging system includes a three-phase power distribution network (including A, B, C phases) and N charging terminals 1, where each phase line of the three-phase power distribution network has N charging terminals 1 connected to the phase line to be connected to the phase line for power-taking, and in addition, N-3N charging terminals 1 are connected to three phase lines through corresponding phase change switches 2 respectively for power-taking with any one of the three phase lines according to the state of the phase change switch 2, where N and N are positive integers, N is an integer multiple of 3, and N > 3N, and the value of N is based on: when at most n charging terminals 1 are connected with the same phase line and work with rated current, and the other two phase lines are in no-load, the three-phase unbalance degree of the three-phase power distribution network is not greater than a set threshold value. The N charging terminals 1 shown in fig. 1 are equally divided into three parts, and of the N/3 charging terminals 1 in each part, N charging terminals 1 are not provided with phase change switches 2, and are directly connected with corresponding phase lines, and in addition, N/3-N charging terminals 1 are connected to three phase lines through corresponding phase change switches 2. Each phase change switch 2 may include three switch units, so that the corresponding charging terminal 1 may be connected to phase a, phase B, or phase C in different switch states.
As shown in fig. 1, the main controller 3 is provided in the embodiment of the present invention to implement a three-phase balance control method of an ac charging system.
As shown in fig. 2, the three-phase balance control method of the ac charging system according to the embodiment of the present invention includes the following steps:
and S1, acquiring the working state of each charging terminal, and acquiring the working current and the connected phase line of the charging terminal in the charging state.
For the charging terminal without the corresponding phase change switch, the phase line type connected with the charging terminal is stored in the charging terminal, so that when the charging terminal gets electricity from the phase line to charge the electric automobile, the charging terminal is in a charging state and can determine the phase line connected with the charging terminal. For the charging terminal provided with the phase change switch, the state of the phase change switch can be adjusted by the instruction sent by the corresponding charging terminal, namely, the charging terminal directly controls the phase change switch to enable the charging terminal to be connected with a certain phase line, so that the charging terminal can also know the connected phase line. Meanwhile, each charging terminal in a charging state can acquire the working current of the charging terminal.
In one embodiment of the present invention, the charging terminal may transmit information such as its operating state, operating current, and phase line connected to the charging terminal to the main controller through wireless communication. For example, the main controller may perform wireless communication with each charging terminal through any one or more of a WIFI module, a 3G module, a 4G module, a PLC power carrier module, a bluetooth module, a GPRS module, a 433 wireless communication module, a 315 wireless communication module, and a zigbee module, so as to receive the above information.
And S2, acquiring the electric parameters of the three-phase power distribution network.
In one embodiment of the invention, the electrical parameter of the three-phase power distribution network is the current of each phase line of the three-phase power network.
In another embodiment of the invention, the electrical parameter of the three-phase power distribution network is the voltage of each phase line of the three-phase power network.
The main controller can obtain the current or voltage of each phase line in the three-phase power distribution network for subsequent calculation of the unbalance degree of the three phases.
And S3, when the working state of the charging terminal changes, the working current of the charging terminal in the charging state changes or the phase line connected with the charging terminal in the charging state changes, calculating the three-phase unbalance degree of the three-phase power distribution network according to the electric parameters of the three-phase power distribution network.
When the operating state of one or some of the charging terminals changes, or the operating current of one or some of the charging terminals in the charging state changes, or the phase line connected to one or some of the charging terminals in the charging state changes, the three-phase imbalance degree of the three-phase power distribution network changes, and at this time, the imbalance degree may be calculated by the main controller according to the current or voltage of each phase line in the three-phase power distribution network obtained in step S2. Taking the example of calculating the degree of unbalance according to the current of each phase line in the three-phase power distribution network, the degree of unbalance epsilon of the three phases of the three-phase power distribution network may be:
ε＝△Imax/Iav
wherein, the delta Imax is the maximum value of the difference value of the three-phase current and the average current, IavFor the average current, Δ Imax ═ max { | IA-Iav|,|IB-Iav|,|IC-Iav|}，Iav＝(IA+IB+IC)/3，IA、IB、ICRespectively, are effective values for the current of A, B, C phase lines.
Of course, in other embodiments of the present invention, the three-phase imbalance degree epsilon of the three-phase power distribution network may be calculated in other manners, which are not listed here.
And S4, judging whether the three-phase unbalance degree of the three-phase power distribution network is larger than a set threshold value.
If the three-phase unbalance degree of the three-phase power distribution network is larger than the set threshold, the three-phase unbalance degree of the three-phase power distribution network is beyond the normal range, and if the three-phase unbalance degree of the three-phase power distribution network is not larger than the set threshold, the three-phase basic balance of the three-phase power distribution network is represented, and adjustment of subsequent steps is not needed.
And S5, if the three-phase unbalance degree of the three-phase power distribution network is larger than the set threshold, executing an adjusting scheme to adjust the state of at least one group of phase change switches, so that the corresponding charging terminals switch the connected phase lines to reduce the three-phase unbalance degree of the three-phase power distribution network.
It can be understood from the above value of n that if the three-phase imbalance of the three-phase power distribution network is greater than the set threshold, at least one charging terminal connected to the three phase lines through the phase change switch and in the operating state is necessarily present.
In one embodiment of the invention, the regulation scheme is performed to minimize the three-phase imbalance of the three-phase distribution network, in particular to minimize the maximum of the differences between the three-phase currents and the average current.
Further, the implemented regulation scheme minimizes the number of regulated commutation switches on the premise that the three-phase imbalance of the three-phase distribution network is minimized.
Further, on the premise that the three-phase imbalance degree of the three-phase power distribution network is minimum and the number of the adjusted phase change switches is minimum, the adjustment scheme is executed to minimize the number of charging terminals of key users (for example, users who have opened charging members) among the charging terminals which switch the connected phase lines.
In an embodiment of the present invention, the main controller may determine the number x of the charging terminals connected to the three phase lines through the corresponding phase change switches and in the charging state, where 0 is set according to the operating state of each charging terminal acquired in step S1<x is less than or equal to N-3N. The x charging terminals can then be arranged in a permutation and combination manner among a total of N-3N charging terminals connected to the three phase lines via the respective phase change switches, a total of
(indicating the number of permutations for taking out x elements from N-3N different elements) arrangement in which the charging terminals in a charged state arranged to the 1 st to N/3 th-N can be regarded as being connected to the a-phase line, and the charging terminals in a charged state arranged to the N/3-N +1 nd to 2N/3-2N can be regarded as being connected to the a-phase lineThe charging terminals in a charging state, which are connected with the phase line B, are arranged in the 2N/3-2N +1 to the N-3N, and can be regarded as being connected with the phase line C.
It should be understood that an arrangement that enables the state of at least one set of commutation switches to be changed is a tuning scheme.
For each arrangement scheme, the main controller can calculate the maximum value delta Imax in the difference value between the three-phase current and the average current, the number delta of the adjusted phase change switches and the number eta of charging terminals of key users in the charging terminals for switching the switched phase line under the arrangement scheme. Δ Imax is calculated according to the calculation formula in step S3, where after a charging terminal is switched from being connected to another phase line, the working current of the charging terminal needs to be subtracted from the current of one phase line, and the working current of the charging terminal needs to be added to the current of the other phase line. When a charging terminal is switched from one phase line to another phase line, delta is added with 1, when a charging terminal of an important user is switched from one phase line to another phase line, eta is added with 1, wherein the initial values of delta and eta are both 0.
Then, the main controller can select an arrangement scheme with the minimum Delta Imax according to a bubbling method, and the arrangement scheme with the minimum Delta Imax can be an adjustment scheme; when the arrangement schemes with the same delta Imax appear, the arrangement scheme with smaller delta is selected, and when the arrangement schemes with the same delta Imax and the same delta appear, the arrangement scheme with smaller eta is selected.
And finally, the main controller sends an adjusting instruction to a charging terminal corresponding to the phase change switch needing to change the state according to the finally selected arrangement scheme, namely the adjusting scheme, and the charging terminal executes the adjusting instruction to enable the phase change switch to stably and quickly switch the state, so that the charging terminal is switched to be connected with a target phase line, and the three-phase unbalance degree of the three-phase power distribution network is reduced to be below a set threshold value.
As shown in fig. 3, a three-phase balance control method of an ac charging system according to an embodiment of the present invention includes the following steps:
s301, collecting related load information of a branch where each charging terminal is located. The charging system comprises an operating state of each charging terminal, an operating current of the charging terminal in the charging state and a phase line which is connected.
And S302, monitoring whether the load configuration of the charging terminal is changed. That is, whether the working state of the charging terminal changes, the working current of the charging terminal in the charging state changes, or the phase line connected to the charging terminal in the charging state changes. The monitoring can be carried out in real time, and can also be carried out once every other detection period. If yes, executing step S303; if not, step S302 is repeatedly executed.
And S303, calculating the three-phase unbalance epsilon.
And S304, judging whether the three-phase unbalance epsilon is larger than a set threshold value. If yes, go to step S305; if not, return to step S302.
S305 calculates the current Δ Imax, and sets Δ Imax0 to Δ Imax, j to 0, δ 0 to 0, and η 0 to 0.
And S306, arranging the charging terminals which are connected to the three phase lines through the corresponding phase change switches and are in a charging state to form an arrangement scheme. Under each arrangement scheme, the charging terminal in a charging state is still connected with the corresponding phase line if the phase change switch is not correspondingly arranged, and is arranged to the 1 st to the N/3 th-N phase lines to be connected with the phase line A, to the N/3-N +1 st to the 2N/3-2N phase lines to be connected with the phase line B, and to the 2N/3-2N +1 st to the N-3N phase lines to be connected with the phase line C according to the arrangement sequence in the arrangement scheme if the phase change switch is correspondingly arranged.
S307, calculating delta Imax, delta and eta.
S308, judging whether the delta Imax is smaller than the delta Imax 0. If not, go to step S309; if so, step S313 is performed.
S309, it is determined whether Δ Imax is Δ Imax 0. If yes, go to step S310; if not, step S314 is performed.
S310, judging whether delta is less than delta 0. If not, go to step S311; if so, step S313 is performed.
S311 determines whether δ is δ 0. If yes, go to step S312; if not, step S314 is performed.
S312, judging whether eta is less than eta 0. If so, go to step S313; if not, step S314 is performed.
S313, store the alignment scheme, overwrite the original alignment scheme, and assign Δ Imax0 ═ Δ Imax, δ 0 ═ δ, η 0 ═ η.
S314，j＝j+ 1。
S315, judging whether or not
. If yes, go to step S316; if not, return to step S306.
And S316, switching the phase lines connected with the charging terminal according to the finally stored arrangement scheme.
According to the three-phase balance control method of the alternating current charging system, aiming at the alternating current charging system with partial charging terminals not provided with phase change switches, firstly, the working state of each charging terminal, the working current of the charging terminal in the charging state and the connected phase line are obtained, acquiring the electrical parameters of the three-phase power distribution network, calculating the three-phase unbalance of the three-phase power distribution network according to the acquired information, when the three-phase unbalance degree of the three-phase power distribution network is larger, the corresponding charging terminal switches the connected phase line by adjusting the state of the phase change switch so as to reduce the three-phase unbalance degree of the three-phase power distribution network, therefore, 3n groups of phase change switches are reduced, on one hand, the cost can be saved, the reliability of the alternating current charging system is improved, on the other hand, the calculated amount of three-phase balance control can be reduced, and therefore three-phase balance of the alternating current charging system can be achieved quickly and effectively.
The invention further provides a three-phase balance control device of the alternating current charging system, which corresponds to the three-phase balance control method of the alternating current charging system in the embodiment.
As shown in fig. 4, the three-phase balance control device of the ac charging system according to the embodiment of the present invention includes a first obtaining module 10, a second obtaining module 20, a calculating module 30, a determining module 40, and an adjusting module 50. The first obtaining module 10 is configured to obtain a working state of each charging terminal, and obtain a working current of the charging terminal in the charging state and a phase line connected to the charging terminal; the second obtaining module 20 is configured to obtain an electrical parameter of the three-phase power distribution network; the calculating module 30 is configured to calculate a three-phase imbalance of the three-phase power distribution network according to an electrical parameter of the three-phase power distribution network when a working state of a charging terminal changes, a working current of the charging terminal in the charging state changes, or a phase line connected to the charging terminal in the charging state changes; the judging module 40 is configured to judge whether a three-phase imbalance of the three-phase power distribution network is greater than a set threshold; the adjusting module 50 is configured to execute an adjusting scheme when the three-phase imbalance of the three-phase power distribution network is greater than a set threshold, so as to adjust the state of at least one set of phase change switches, so that the corresponding charging terminal switches the connected phase line, thereby reducing the three-phase imbalance of the three-phase power distribution network.
In one embodiment of the invention, the electrical parameter of the three-phase power distribution network is the current of each phase line of the three-phase power network.
In another embodiment of the invention, the electrical parameter of the three-phase power distribution network is the voltage of each phase line of the three-phase power network.
When the working state of one or some of the charging terminals changes, or the working current of one or some of the charging terminals in the charging state changes, or the phase line connected to one or some of the charging terminals in the charging state changes, the three-phase imbalance degree of the three-phase power distribution network changes, and at this time, the calculating module 30 may calculate the imbalance degree according to the current or voltage of each phase line in the three-phase power distribution network. Taking the example of calculating the degree of unbalance according to the current of each phase line in the three-phase power distribution network, the degree of unbalance epsilon of the three phases of the three-phase power distribution network may be:
ε＝△Imax/Iav
wherein, the delta Imax is the maximum value of the difference value of the three-phase current and the average current, IavFor the average current, Δ Imax ═ max { | IA-Iav|,|IB-Iav|,|IC-Iav|}，Iav＝(IA+IB+IC)/3，IA、IB、ICOf A, B, C phase lines respectivelyAnd (4) effective value.
Of course, in other embodiments of the present invention, the calculating module 30 may also calculate the three-phase imbalance epsilon of the three-phase power distribution network in other manners, which are not listed here.
If the three-phase unbalance degree of the three-phase power distribution network is greater than the set threshold, the three-phase unbalance degree of the three-phase power distribution network exceeds the normal range, and if the three-phase unbalance degree of the three-phase power distribution network is not greater than the set threshold, the three-phase basic balance of the three-phase power distribution network is represented, and subsequent adjustment by the adjusting module 50 is not needed.
It can be understood from the above value of n that if the three-phase imbalance of the three-phase power distribution network is greater than the set threshold, at least one charging terminal connected to the three phase lines through the phase change switch and in the operating state is necessarily present.
In one embodiment of the invention, the regulation scheme performed by the regulation module 50 minimizes the three-phase imbalance of the three-phase distribution network, in particular, minimizes the maximum of the differences between the three-phase currents and the average current.
Further, the adjusting module 50 executes an adjusting scheme to minimize the number of the phase change switches to be adjusted on the premise that the three-phase imbalance degree of the three-phase power distribution network is minimized.
Further, on the premise that the three-phase imbalance degree of the three-phase power distribution network is minimum and the number of the phase change switches to be adjusted is minimum, the adjustment scheme executed by the adjustment module 50 minimizes the number of charging terminals of key users among the charging terminals switching the phase line to be connected.
In an embodiment of the present invention, the adjusting module 50 may determine the number x of the charging terminals in the charging state connected to the three phase lines through the corresponding phase change switches according to the working state of each charging terminal acquired by the first acquiring module 10, wherein 0 is set in the number x<x is less than or equal to N-3N. The adjusting module 50 may then arrange the x charging terminals in a permutation and combination manner among a total of N-3N charging terminals connected to the three phase lines via the respective phase change switches, a total of
(indicating the number of permutations of taking out x elements from N-3N different elements) arrangement in which the charge terminals in a charged state arranged to the 1 st to N/3 th-N can be regarded as being connected to the a-phase line, the charge terminals in a charged state arranged to the N/3-N +1 st to 2N/3-2N can be regarded as being connected to the B-phase line, and the charge terminals in a charged state arranged to the 2N/3-2N +1 st to N-3N can be regarded as being connected to the C-phase line.
It should be understood that an arrangement that enables the state of at least one set of commutation switches to be changed is a tuning scheme.
For each arrangement, the adjusting module 50 may calculate a maximum value Δ Imax of the difference between the three-phase current and the average current, the number δ of the phase-change switches to be adjusted, and the number η of the charging terminals of the key user among the charging terminals switching the phase line to be switched on. Δ Imax is calculated according to the above-mentioned calculation formula ═ max { | IA-Iav|,|IB-Iav|,|IC-IavAnd (4) calculating, wherein after a charging terminal is switched from being connected with one phase line to being connected with the other phase line, the working current of the charging terminal needs to be subtracted from the current of one phase line, and the working current of the charging terminal needs to be added to the current of the other phase line. When a charging terminal is switched from one phase line to another phase line, delta is added with 1, when a charging terminal of an important user is switched from one phase line to another phase line, eta is added with 1, wherein the initial values of delta and eta are both 0.
Then, the adjusting module 50 may select an arrangement scheme with the minimum Δ Imax according to a bubbling method, and the arrangement scheme with the minimum Δ Imax is necessarily an adjusting scheme; when the arrangement schemes with the same delta Imax appear, the arrangement scheme with smaller delta is selected, and when the arrangement schemes with the same delta Imax and the same delta appear, the arrangement scheme with smaller eta is selected.
Finally, the adjusting module 50 sends an adjusting instruction to the charging terminal corresponding to the commutation switch whose state needs to be changed according to the finally selected arrangement scheme, that is, the adjusting scheme, and the charging terminal executes the adjusting instruction to enable the commutation switch to perform state switching smoothly and quickly, so that the charging terminal is switched to be connected with the target phase line, and the three-phase imbalance degree of the three-phase power distribution network is reduced to be below the set threshold value.
According to the three-phase balance control device of the alternating current charging system, aiming at the alternating current charging system with partial charging terminals not provided with phase change switches, firstly, the working state of each charging terminal, the working current of the charging terminal in the charging state and the connected phase line are obtained, acquiring the electrical parameters of the three-phase power distribution network, calculating the three-phase unbalance of the three-phase power distribution network according to the acquired information, when the three-phase unbalance degree of the three-phase power distribution network is larger, the corresponding charging terminal switches the connected phase line by adjusting the state of the phase change switch so as to reduce the three-phase unbalance degree of the three-phase power distribution network, therefore, 3n groups of phase change switches are reduced, on one hand, the cost can be saved, the reliability of the alternating current charging system is improved, on the other hand, the calculated amount of three-phase balance control can be reduced, and therefore three-phase balance of the alternating current charging system can be achieved quickly and effectively.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a three-phase balance control method of AC charging system, its characterized in that, AC charging system includes three-phase distribution network and N charging terminal, every phase line of three-phase distribution network all has corresponding N charging terminal to be connected to this phase line so that get the electricity with this phase line switch-on, and N-3N charging terminal is connected to three phase line so that according to the state of commutation switch and arbitrary phase line switch-on of three phase line get the electricity through corresponding commutation switch respectively, and wherein, N and N are positive integer, N is the integral multiple and N > 3N of 3, and the value basis of N is: when at most n charging terminals are connected with the same phase line and work with rated current, and the other two phase lines are in no-load, the three-phase unbalance degree of the three-phase power distribution network is not greater than a set threshold value, and the three-phase balance control method comprises the following steps:
acquiring the working state of each charging terminal, and acquiring the working current and the connected phase line of the charging terminal in the charging state;
acquiring electrical parameters of the three-phase power distribution network;
when the working state of a charging terminal changes, the working current of the charging terminal in the charging state changes or a phase line connected with the charging terminal in the charging state changes, calculating the three-phase unbalance degree of the three-phase power distribution network according to the electric parameters of the three-phase power distribution network;
judging whether the three-phase unbalance of the three-phase power distribution network is greater than the set threshold value or not;
and if the three-phase unbalance degree of the three-phase power distribution network is greater than the set threshold, executing an adjusting scheme to adjust the state of at least one group of phase change switches, so that the corresponding charging terminals switch the connected phase lines, and the three-phase unbalance degree of the three-phase power distribution network is reduced.
2. The method of claim 1, wherein the electrical parameter of the three-phase power distribution network is a current of each phase of the three-phase power distribution network.
3. The method of claim 2, wherein the adjustment scheme is performed to minimize three-phase imbalance of the three-phase power distribution network.
4. The method according to claim 3, wherein the adjustment scheme is performed to minimize the number of the commutation switches to be adjusted on the premise that the three-phase imbalance of the three-phase power distribution network is minimized.
5. The method according to claim 4, wherein the adjustment scheme is performed to minimize the number of charging terminals of a key user among the charging terminals for switching the phase line connected, on the premise that the degree of unbalance of the three phases in the three-phase power distribution network is minimized and the number of the phase change switches is minimized.
6. The utility model provides an exchange charging system's three-phase balance control device, its characterized in that, exchange charging system includes three-phase distribution network and a N charging terminal, each phase line of three-phase distribution network all has a corresponding N charging terminal to be connected to this phase line so that get the electricity with this phase line switch-on, and a N-3N charging terminal is connected to three phase line so that according to through corresponding commutation switch the state of commutation switch and arbitrary phase line switch-on in the three phase line get the electricity, wherein, N and N are positive integer, N is 3's integer multiple and N > 3N, and the value basis of N is: when at most n charging terminals are connected with the same phase line and work with rated current, and the other two phase lines are in no load, the three-phase unbalance degree of the three-phase power distribution network is not more than a set threshold value, and the three-phase balance control device comprises:
the first acquisition module is used for acquiring the working state of each charging terminal and acquiring the working current of the charging terminal in the charging state and the connected phase line;
the second acquisition module is used for acquiring the electrical parameters of the three-phase power distribution network;
the calculation module is used for calculating the three-phase unbalance degree of the three-phase power distribution network according to the electrical parameters of the three-phase power distribution network when the working state of a charging terminal changes, the working current of the charging terminal in the charging state changes or the phase line connected with the charging terminal in the charging state changes;
the judging module is used for judging whether the three-phase unbalance of the three-phase power distribution network is greater than the set threshold value or not;
and the adjusting module is used for executing an adjusting scheme when the three-phase unbalance of the three-phase power distribution network is greater than the set threshold value so as to adjust the state of at least one group of phase change switches and enable the corresponding charging terminals to switch the connected phase lines, so that the three-phase unbalance of the three-phase power distribution network is reduced.
7. The apparatus of claim 6, wherein the electrical parameter of the three-phase distribution network is a current of each phase of the three-phase power network.
8. The apparatus of claim 7, wherein the adjustment module implements an adjustment scheme that minimizes three-phase imbalance of the three-phase power distribution network.
9. The apparatus according to claim 8, wherein the adjustment module performs the adjustment scheme to minimize the number of the phase-change switches to be adjusted on the premise that the three-phase imbalance of the three-phase power distribution network is minimized.
10. The apparatus according to claim 9, wherein the adjustment module performs an adjustment scheme to minimize the number of charging terminals of a key user among the charging terminals for switching the phase line, on the premise that the three-phase imbalance of the three-phase power distribution network is minimized and the number of the phase-change switches is minimized.
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