CN110768278B - Distribution method for adjusting three-phase imbalance of direct-current charger - Google Patents
Distribution method for adjusting three-phase imbalance of direct-current charger Download PDFInfo
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- CN110768278B CN110768278B CN201911080774.9A CN201911080774A CN110768278B CN 110768278 B CN110768278 B CN 110768278B CN 201911080774 A CN201911080774 A CN 201911080774A CN 110768278 B CN110768278 B CN 110768278B
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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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- 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
- B60L53/63—Monitoring or controlling charging stations in response to network capacity
-
- 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
- B60L53/67—Controlling two or more charging stations
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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
-
- 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
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a distribution method for participation of a direct-current charger in three-phase unbalance adjustment, relates to the technical field of power regulation methods of power distribution networks, and solves the technical problem that the utilization potential of the charger with fewer charging times cannot be effectively exerted by the method in the prior art. The method comprises the following steps of S1: calculating compensation currents of a plurality of unbalanced load points; s2: inputting a statistical time period to the central controller, transmitting the statistical time period to a plurality of charging controllers, and counting the charging times of a plurality of direct current chargers to determine distribution coefficients of the plurality of direct current chargers; s3: the unbalanced current to be compensated of the direct current charger of the final stage is assigned with weight; s4: and in the input time period, the central controller performs distribution adjustment on the direct current charger until the control flow is ended after the expected effect is achieved. The invention considers the difference of the charging times in the same period, and plays the utilization potential of the charger with fewer charging times to a greater extent.
Description
Technical Field
The invention belongs to the technical field of power grid equipment adjusting methods, and particularly relates to a distribution method for adjusting three-phase imbalance of a direct-current charger.
Background
At present, the domestic electric automobile industry is currently developing vigorously, and the direct current charging pile is better seen in the market by being capable of rapidly supplementing electric energy, but because the charging task of the direct current charger is not full, the idle capacity of the direct current charger can be fully utilized, and the three-phase imbalance treatment of the distribution network feeder line is completed. The direct current charging control method provided by the direct current charging control method for balancing three-phase imbalance treatment in the prior art is to collect current data of a distribution network feeder at different points and coordinate and control the operation of a plurality of direct current chargers, so that the compensation of the three-phase imbalance current of the distribution network feeder is realized, but the difference of charging times of all the direct current chargers in the same time period is not considered, so that the utilization potential of chargers with fewer charging times cannot be exerted to a greater extent, for example, the idle time period exists for the direct current chargers.
In view of this, the present invention has been made.
Disclosure of Invention
The application provides a distribution method for adjusting three-phase imbalance of a direct current charger, which solves the technical problem that the method in the prior art does not consider the difference of charging times in the same time period and cannot exert the utilization potential of the charger with fewer charging times. The technical scheme has a plurality of technical effects, and the following is provided.
The distribution method for adjusting three-phase unbalance of the direct current chargers comprises a plurality of direct current chargers connected in series with a power grid, wherein the plurality of direct current chargers are respectively provided with controllers, power utilization users are connected to power transmission lines of adjacent direct current chargers, and the plurality of controllers are electrically connected with a central controller, and the distribution method comprises the following steps:
s1: collecting unbalanced currents of unbalanced load points of a plurality of electricity users on a power transmission line, and calculating compensation currents of the unbalanced load points; is counted as delta I 1 、ΔI 2 、....ΔI N Wherein N is a natural number 123 … N, deltaI N The method is determined by a negative sequence voltage unbalance method, a zero sequence voltage unbalance method and a symmetrical component method;
s2: inputting a statistical time period to the central controller, transmitting the statistical time period to a plurality of controllers, and counting the charging times of a plurality of direct current chargers, wherein the distribution coefficients of the plurality of direct current chargers meet the following conditions:
in formula 2: CNT is the number of charging times; k is the distribution coefficient; n is a natural number; c is a calculated value, and is the sum of the charging times after taking the inverse proportion;
s3: the unbalanced current to be compensated of the direct current charger of the final stage is assigned with weight;
s4: after the input time period statistics are finished, calculating a plurality of unbalanced load currents again and distributing weights again for control, and meeting the following conditions:
(ΔI 1 +ΔI 2 +.....+ΔI n )<ΔI v when the control flow ends, in the formula, delta I v For the calculated load point three-phase unbalance current, when the load point is lower than delta I n When the unbalanced load current reaches an acceptable range, the central controller stops the distribution adjustment of the direct current charger, and the control flow is ended.
In a preferred or alternative embodiment, the number of the plurality of dc chargers is 3, the number of the compensation current points of the unbalanced load points is 2, and Δi is respectively 1 And DeltaI 2 。
In a preferred or alternative embodiment, the weighting factor of the final dc charger in S3 is 0.7 to 0.9.
In a preferred or alternative embodiment, the weighting factor of the final dc charger in S3 is 0.8, and the following is satisfied:
I c1 ＝k 1 (ΔI 1 +02ΔI 2 )
I c2 ＝k 2 (ΔI 1 +02ΔI 2 )
I c3 ＝k 3 (ΔI 1 +08ΔI 2 ) Wherein I is c1 、I c2 、I c3 Respectively compensating unbalanced currents of the corresponding direct current chargers;
after the input time period statistics are over, re-calculating the unbalanced load current Δi in S4 1 、ΔI 2 And re-assigning weights to satisfy:
unbalanced load current (ΔI) 1 +ΔI 2 )＜ΔI V And when the control flow is ended, inputting a new time period to the central controller for statistics.
In a preferred or alternative embodiment, an inductor is installed at the output of the power grid.
The beneficial effects of the application are as follows:
the invention further optimizes the control method, considers the difference of the charging times of each direct current charger in the same time period, and can bring the utilization potential of the charger with less charging times into play to a greater extent.
S1: collecting unbalanced currents of a plurality of unbalanced load points of power utilization users on a power transmission line, and calculating compensation currents of a plurality of unbalanced load points by adopting a method in the prior art;
s2: in order to fully exert the utilization rate of the direct current chargers, inputting a statistical time period to the central controller, transmitting the statistical time period to a plurality of controllers, and counting the charging times of the plurality of direct current chargers, wherein the distribution coefficients of the plurality of direct current chargers;
s3: the unbalanced current to be compensated of the direct current charger of the final stage is distributed with weights in the same period;
s4: after the input time period statistics are finished, calculating a plurality of unbalanced load currents again and distributing weights again for control, and meeting the following conditions: (ΔI) 1 +ΔI 2 +.....+ΔI n )＜ΔI v When the control flow ends, in the formula, delta I v For unbalance value of load point of current valve installed on electricity consumer, when the unbalance value is lower than delta I n When the unbalanced load current reaches an acceptable range, the central controller stops the distribution adjustment of the direct current chargers, so that the situation that one or more direct current chargers have idle or low utilization rate in the same period is avoided, for example, a new statistical time period needs to be input again, for example, the calculation is carried out in a unit of week or month, and the calculation is carried out according to the method so as to meet the requirement of exerting the utilization potential of the chargers with less charging times.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a method for adjusting three-phase imbalance of a direct current charger according to the present invention.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
Referring to fig. 1, the distribution method for adjusting three-phase imbalance of direct current chargers includes a plurality of direct current chargers connected in series with a power grid, the plurality of direct current chargers are respectively provided with controllers, power users are connected to power transmission lines of adjacent direct current chargers, and the plurality of controllers are electrically connected with a central controller, and the distribution method includes:
s1: collecting unbalanced currents of a plurality of unbalanced load points of power utilization users on a power transmission line, and calculating compensation currents of the unbalanced load points; is counted as delta I 1 、ΔI 2 、....ΔI N Wherein N is a natural number 123 … N, deltaI N The method is determined by a negative sequence voltage unbalance method, a zero sequence voltage unbalance method and a symmetrical component method;
the part of calculation method is the prior art, and the calculation method is as follows:
1) When the three phases are unbalanced, assuming that the three-phase currents of the line are Ia, ib and Ic respectively, the three-phase currents can be decomposed into positive sequence current I1, negative sequence current I2 and zero sequence current I0 according to a symmetrical component method. The relationship between the phase current and the sequence current is as follows
Wherein a=e j120° 。
2) And defining the negative sequence current unbalance and the zero sequence current unbalance according to the concepts of the negative sequence voltage unbalance and the zero sequence voltage unbalance. The expressions of the negative sequence current unbalance and the zero sequence current unbalance are as follows respectively
Wherein, I1, I2 and I0 are the amplitudes of positive sequence, negative sequence and zero sequence currents respectively.
3) Let the three-phase line resistance be R. When the three phases are balanced, the line current is I, and the line current is equal to the positive sequence current when the three phases are unbalanced, namely I=I1, so that the line loss calculation formula can be converted into
s2: the statistical time period is input to the central controller and is transmitted to the controllers, the charging times of the direct current chargers are counted, the distribution coefficients of the direct current chargers meet the following conditions:
in formula 2: CNT is the number of charging times; k is the distribution coefficient; n is a natural number; c is a calculated value, and is the sum of the charging times after taking the inverse proportion;
s3: the unbalanced current to be compensated of the direct current charger of the final stage is distributed with weight;
s4: after the input time period statistics are finished, calculating a plurality of unbalanced load currents again and reallocating weights for control, and meeting the following conditions:
(ΔI 1 +ΔI 2 +.....+ΔI n )＜ΔI v when the control flow ends, in the equation,
ΔI V for the calculated load point three-phase unbalance current, the maximum load rate is generally calculated as a single-phase<At 30%, the three-phase imbalance, ΔI, was not calculated V The reference value may be, for example,
firstly, it is: an imbalance value is collected for a load point on the consumer line, for example, by installing a current valve. The unbalance values of the load points on the power utilization user line are collected and used for being input into the main controller, so that the utilization maximization requirement of each direct current charger can be met within a set time period;
secondly, it is: in the system (maximum current-minimum current)/maximum current or Max (phase current-three-phase average current), for example, the reference direction in the figure is exemplified by the phase current from left to right being I1 90A, I2 and 80A, I3 being 40A, then the three-phase average current is 70A, the three-phase average current from which the phase current can be deduced is 20A, 10A, 30A, respectively, and the maximum value (30A) is taken as Δi V Reference value.
When less than delta I N When the unbalanced load current reaches an acceptable range, the central controller stops the distribution and adjustment of the direct current charger, and the control flow is ended; greater than or equal to DeltaI N And (3) according to the input time period, the utilization maximization of each direct current charger is realized, and the situation that the direct current charger is idle is avoided.
In S2: in order to fully exert the utilization rate of the direct current chargers, taking the condition of using the chargers in the same period into consideration, inputting a statistical time period into a central controller and transmitting the statistical time period to a plurality of controllers corresponding to the direct current chargers, and counting the charging times of the direct current chargers and distributing coefficients of the direct current chargers;
in S3: the unbalanced current to be compensated of the direct current charger of the final stage is distributed with weights in the same period;
in S4:after the input time period statistics are finished, calculating a plurality of unbalanced load currents again and distributing weights again for control, and meeting the following conditions: (ΔI) 1 +ΔI 2 +.....+ΔI n )＜ΔI u When the control flow ends, in the formula, delta I V For unbalance value of load point of current valve installed on electricity consumer, when the unbalance value is lower than delta I N When the unbalanced load current reaches an acceptable range, the central controller stops the distribution adjustment of the direct current chargers, so that the situation that one or more direct current chargers have idle or low utilization rate in the same period is avoided, for example, a new statistical time period needs to be input again, for example, the calculation is carried out in a unit of week or month, and the calculation is carried out according to the method so as to meet the requirement of exerting the utilization potential of the chargers with less charging times.
As an alternative implementation method, the number of the plurality of direct current chargers is 3, the number of the compensation current points of the unbalanced load points is 2, and the compensation current points are respectively delta I 1 And DeltaI 2 In practical use, the number of direct current chargers is 3, which is a common situation, and therefore, the direct current chargers have a representative meaning.
As an alternative implementation method, the weight coefficient of the final stage direct current charger in S3 is 0.7-0.9, for example, the weight coefficient of the final stage direct current charger is 0.8, and the following conditions are satisfied:
I c1 ＝k 1 (ΔI 1 +0.2ΔI 2 )
I c2 ＝k 2 (ΔI 1 +0.2ΔI 2 )
I c3 ＝k 3 (ΔI 1 +0.8ΔI 2 ) Wherein I is c1 、I c2 、I c3 Respectively compensating unbalanced currents of the corresponding direct current chargers;
after the end of the input time period statistics in S4, the unbalanced load current Δi is recalculated 1 、ΔI 2 And re-assigning weights to satisfy:
unbalanced load current (ΔI) 1 +ΔI 2 )＜ΔI V When the control flow is ended, the central control is performedThe controller inputs a new time period for statistics.
As shown in fig. 1, in the prior art system, an inductor, such as an equivalent inductance or an equivalent impedance, is generally installed at the output end of the power grid, so as to facilitate calculation.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (5)
1. The distribution method for the three-phase unbalanced adjustment of the direct current chargers comprises a plurality of direct current chargers connected in parallel with a power grid, wherein the direct current chargers are respectively provided with a charging controller, three-phase unbalanced load flow exists in a distribution line connected to the direct current chargers, and the charging controllers are electrically connected with a central controller, and the distribution method is characterized by comprising the following steps:
s1: collecting unbalanced currents of a plurality of unbalanced load points of electricity consumption on a distribution line, and calculating compensation currents of a plurality of unbalanced load points; is counted as delta I 1 、ΔI 2 、....、ΔI N Wherein N is the number of unbalanced load points, ΔI N The method comprises the steps of determining the unbalance degree of the negative sequence voltage, the unbalance degree of the zero sequence voltage and the symmetrical components;
s2: the statistical time period is input to the central controller and is transmitted to a plurality of charging controllers, the charging times of a plurality of direct current chargers are counted, distribution coefficients of the plurality of direct current chargers are determined, and the distribution coefficients of the plurality of direct current chargers meet the following requirements:
wherein: CNT (carbon nanotube) 1 ，CNT 2 ，......，CNT n Charging of each DC chargerThe number of times; k (k) n For the distribution coefficient; n is the number of the direct current chargers; c is a calculated value, and is the sum of the charging times after taking the inverse proportion;
s3: the unbalanced current weight to be compensated is distributed to the direct current charger of the final stage;
s4: after the input time period statistics are finished, calculating the compensation currents of a plurality of unbalanced load points again, and reassigning weights to control, wherein the conditions are satisfied:
(ΔI 1 +ΔI 2 +.....+ΔI N )＜ΔI v when the control flow ends, in the formula, delta I v Three-phase unbalanced currents for the calculated load points; when less than delta I v When the unbalanced load current reaches an acceptable range, the central controller stops the distribution adjustment of the direct current charger, and the control flow is ended.
2. The distribution method according to claim 1, wherein the compensation current points of the balance load points of the dc charger are Δi respectively 1 And DeltaI 2 The weight coefficient value range of the final stage direct current charger in the distribution method is [0.7,0.9 ]]。
3. The distribution method according to claim 1, wherein the weight coefficient of the final dc charger in S3 is 0.8, and satisfies:
after the input time period statistics are over, re-calculating the unbalanced load current Δi in S4 1 And DeltaI 2 And weight is allocated to satisfy:
unbalanced load current (ΔI) 1 +ΔI 2 )＜ΔI V And when the control flow is ended, inputting a new time period to the central controller for statistics.
4. A distribution method according to claim 1, characterized in that sensors are installed on the distribution lines, collecting the voltage and current of the lines.
5. The allocation method according to claim 1, wherein said Δi v The maximum value of the difference value between the phase current and the three-phase average current of each direct-current charger is obtained.
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| CN107317352A (en) * | 2017-06-22 | 2017-11-03 | 南京工程学院 | Miniature photovoltaic DC-to-AC converter control method with three-phase imbalance abatement functions |
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