CN109167375A - Electric automobile charging station three-phase voltage autobalance charging system and charging method - Google Patents
Electric automobile charging station three-phase voltage autobalance charging system and charging method Download PDFInfo
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- CN109167375A CN109167375A CN201811237573.0A CN201811237573A CN109167375A CN 109167375 A CN109167375 A CN 109167375A CN 201811237573 A CN201811237573 A CN 201811237573A CN 109167375 A CN109167375 A CN 109167375A
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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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- 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
- Y02T90/14—Plug-in electric vehicles
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Abstract
Electric automobile charging station three-phase voltage autobalance charging system and charging method, main circuit use three-phase four-wire system network, and commutation device is made of three groups of bidirectional thyristors；It is drawn after three groups of bidirectional thyristors are in parallel from power grid, as one end of charging pile, the neutral conductor in three-phase four wire system is directly led out, the other end as charging pile；Control circuit is made of microprocessor, voltage detecting circuit, current detection circuit, virtual value conversion circuit, driving circuit.Pass through three-phase voltage, the current value detected, calculate non-equilibrium among three phase voltages, the switch state of every phase thyristor is optimized with simulated annealing in the case where tri-phase unbalance factor is unsatisfactory for and requiring, obtain the smallest switch state of non-equilibrium among three phase voltages, the bearing power of each phase access is adjusted by automatic commutation, to solve the problems, such as the three-phase imbalance caused by power grid after electric car access.
Description
Technical field
The present invention relates to electric automobile charging station three-phase voltage autobalance charging techniques.
Background technique
In recent years, energy shortage and environmental pollution are worldwide common problems, since orthodox car consumes greatly
High-quality oil-gas resource in short supply is measured, therefore promotes green, energy-saving and environmental protection electric cars and helps to realize transportation and energy
Diversification.But charging equipment of electric automobile is made of power electronic devices, can be produced to power distribution network after extensive access power grid
Raw large effect, such as voltage deviation, increase line loss, generation harmonic wave, route three-phase imbalance etc..
Currently, electric vehicle charging mode mainly has three-phase dc quick charge, single phase ac normal charge and replacement electricity
Chi Zusan kind.Single phase ac charging modes will cause the imbalance of three-phase voltage of power grid, and three-phase imbalance will cause power grid
Many influences such as influence power supply reliability, increase transformer excess loss, distribution transformer power output is caused to reduce, increase route
Loss, the output power for reducing motor etc..Pertinent literature, which is described, accesses electricity to electric car using standard particle group algorithm
The method that the three-phase imbalance of net optimizes, by adjusting each phase electricity price, the high raising electricity price of load, the low drop of load in real time
Low electricity price, guidance charge user participates in the adjusting of three-phase imbalance, to reduce power grid tri-phase unbalance factor.But charge user
Randomness and uncertainty allow it to implement relative complex, the bring three-phase that cannot inherently solve unidirectionally to charge is uneven
Weighing apparatus problem.Therefore single phase ac charging modes are directed to, a kind of charging station three-phase voltage autobalance charging system has been invented, so that
Electric car access when can phase order, realize power grid three-phase voltage balance.
Summary of the invention
The object of the present invention is to provide a kind of electric automobile charging station three-phase voltage autobalance charging system and charging sides
Method.
The present invention is electric automobile charging station three-phase voltage autobalance charging system and charging method, electric car charging
It stands three-phase voltage autobalance charging system, main circuit uses three-phase four-wire system network, and commutation device is by three groups of bidirectional thyristors
It composes in parallel；Control circuit in the system is by microprocessor, A phase voltage detection circuit, B phase voltage detection circuit, C phase voltage
Detection circuit, A phase current sensing circuit, B phase current sensing circuit, C phase current sensing circuit, virtual value conversion circuit, A phase are driven
Dynamic circuit, B phase driving circuit and C phase driving circuit composition.
The charging method of electric automobile charging station three-phase voltage autobalance charging system of the invention, the steps include: head
First voltage detecting circuit, current detection circuit detect power grid three-phase voltage, current signal, convert through virtual value conversion circuit, so
Calculation process is carried out by microprocessor analogue amount input terminal AN0~AN5 input microprocessor afterwards, obtained operation result is passed through
Output end of microprocessor input driving circuit, last driving circuit drives turn on thyristors or the shutdown of corresponding phase, to complete
Automatic commutation operation when electric car charges.
Usefulness of the present invention is: the randomness and randomness that electric car is accessed in charging will cause power grid three-phase
Imbalance, and the electric automobile charging station three-phase voltage autobalance charging system and charging system that the present invention designs, using double
To thyristor as phase-change switch, microprocessor is as control core, by power grid three-phase voltage, current detecting, and counts
Calculate power grid non-equilibrium among three phase voltages.In the case where tri-phase unbalance factor is unsatisfactory for requirement, to the switch shape of every phase thyristor
State is optimized with simulated annealing, thus solve the problems, such as the three-phase imbalance caused by power grid after electric car access,
Do not need it is artificial in order to reduce power grid tri-phase unbalance factor go selection access three phase network in phase sequence, reduce human resources
Waste.
Detailed description of the invention
Fig. 1 is the single-phase charging main circuit figure of electric car, and Fig. 2 is control system architecture figure, and Fig. 3 is to realize automatic commutation master
Program flow diagram, Fig. 4 are simulated annealing subroutine flow charts.
Specific embodiment
As shown in Figure 1 to 4, the present invention is electric automobile charging station three-phase voltage autobalance charging system and charging side
Method, electric automobile charging station three-phase voltage autobalance charging system, main circuit use three-phase four-wire system network, commutation device by
Three groups of bidirectional thyristors compose in parallel；Control circuit in the system is examined by microprocessor, A phase voltage detection circuit, B phase voltage
Slowdown monitoring circuit, C phase voltage detection circuit, A phase current sensing circuit, B phase current sensing circuit, C phase current sensing circuit, virtual value
Conversion circuit, A phase driving circuit, B phase driving circuit and C phase driving circuit composition.
As shown in Figure 1, above-described electric automobile charging station three-phase voltage autobalance charging system, main circuit 1 are adopted
With three-phase four-wire system network, bidirectional thyristor 2, bidirectional thyristor 3 and bidirectional thyristor 4 are respectively connected to power grid A, B, C three-phase, and
It is drawn after connection from power grid, as one end of charging interface 5, the neutral conductor in three-phase four wire system is directly led out, as charging
The other end of interface 5；By controlling the switch state of each phase thyristor, the phase of electric car access is selected, is filled for single phase ac
The electric car charging of electricity.
As shown in Figure 1 and Figure 2, above-described electric automobile charging station three-phase voltage autobalance charging system, control electricity
In road 6, A phase voltage detection circuit 8, B phase voltage detection circuit 10, C phase voltage detection circuit 12, A phase current sensing circuit 9, B
Phase current sensing circuit 11 and C phase current sensing circuit 13 are responsible for detecting each phase voltage of power grid, current value using D.C mutual-inductor；
Voltage that virtual value conversion circuit 14 will test, current signal are converted into virtual value；Microprocessor 7 is inputted by AN0~AN5
End receives gained signal and carries out operation and export control signal；A phase driving circuit 15, B phase driving circuit 16, C phase driving circuit
The 17 control signals for receiving microprocessor 7 drive the bidirectional thyristor on or off of corresponding phase.
As shown in Figure 1 to 4, the charging side of electric automobile charging station three-phase voltage autobalance charging system of the invention
Method the steps include: voltage detecting circuit, current detection circuit detection power grid three-phase voltage, current signal first, turn through virtual value
Change circuit conversion, calculation process is then carried out by microprocessor analogue amount input terminal AN0~AN5 input microprocessor, will
The operation result arrived through output end of microprocessor input driving circuit, last driving circuit drive corresponding phase turn on thyristors or
Shutdown, to complete automatic commutation operation when electric car charging.
As shown in Figure 1 to 4, the charging method of the above electric automobile charging station three-phase voltage autobalance charging system,
It the steps include:
Step 1: detecting the voltage of each phase with D.C mutual-inductor at regular intervals after electric car accesses power grid, electric current is believed
Number；
Step 2: converting virtual value for the voltage of AC signal, current value using virtual value conversion circuit；
Step 3: microprocessor samples three-phase voltage, the current signal virtual value of input, judges tri-phase unbalance factor ρu,
And the upper threshold ρ with settingmax(5%) and bottom threshold ρmin(2%) it is compared；ρu< ρminWhen, power grid three-phase imbalance
Degree is met the requirements, and does not do commutation operation；Work as ρu> ρmaxWhen, power grid is in three-phase imbalance state, is calculated using simulated annealing optimization
Method optimizes the switch state of thyristor, so that the smallest switch state of tri-phase unbalance factor that must send as an envoy to, carries out commutation behaviour
Make；
The judgment method of tri-phase unbalance factor uses IEEE Std 936-1987 standard, select in three-phase phase voltage it is maximum with most
The difference and average phase voltages (V of small VRMS voltage root mean squareav) the ratio between be used as tri-phase unbalance factor:
The smallest objective function of tri-phase unbalance factor are as follows:
Constraint condition are as follows:
K∈{(1 0 0)T,(0 1 0)T,(0 0 1)T(formula three)
IA、IB、IC< Iallow(formula four)
Wherein, K is the switch state of every phase thyristor, and " 1 " indicates thyristor " open-minded ", and " 0 " indicates thyristor " shutdown ",
IallowAllow current value for three-phase；
Step 4: the judgement made according to control system exports corresponding signal, and the brilliant lock of corresponding phase is controlled by driving circuit
Pipe on or off, to complete automatic commutation operation when electric car access；This control system carries out at regular intervals
The judgement of non-equilibrium among three phase voltages carries out three-phase voltage to the electric car load for accessing charging station in this period
Autobalance operation, and hysteresis comparator, which is added, prevents the thyristor of every phase from frequently switching on.
The present invention provides a kind of electric automobile charging station three-phase voltage autobalance charging systems, mainly by following part
Composition: main circuit is as shown in Figure 1, using three-phase four-wire system network, bidirectional thyristor 2, bidirectional thyristor 3 and bidirectional thyristor 4
It is respectively connected to power grid A, B, C three-phase, is drawn after in parallel from power grid, as one end of charging interface 5, in three-phase four wire system
The neutral conductor is directly led out, and selects electronic vapour by controlling the switch state of each phase thyristor as the other end of charging interface 5
The phase of vehicle access, for the electric car charging of single phase ac charging；
Controling circuit structure as shown in Fig. 2, mainly by microprocessor 7, A phase voltage detection circuit 8, B phase voltage detection circuit 10,
C phase voltage detection circuit 12, A phase current sensing circuit 9, B phase current sensing circuit 11, C phase current sensing circuit 13, virtual value
The composition such as conversion circuit 14, A phase driving circuit 15, B phase driving circuit 16, C phase driving circuit 17.
Charging method the following steps are included:
Step 1: at regular intervals with voltage, the electric current of D.C mutual-inductor detection each phase of power grid after electric car accesses power grid
Signal；
Step 2: converting virtual value for the voltage of AC signal, current value using virtual value conversion circuit；
Step 3: microprocessor samples three-phase voltage, the current signal virtual value of input, judges tri-phase unbalance factor ρu,
And the upper threshold ρ with settingmax(5%) and bottom threshold ρmin(2%) it is compared, works as ρu< ρminWhen, power grid three-phase is uneven
Weighing apparatus degree is met the requirements, and does not do commutation operation；Work as ρu> ρmaxWhen, power grid is in three-phase imbalance state.Using simulated annealing optimization
Algorithm optimizes thyristor switch state, so that the smallest switch state of tri-phase unbalance factor that must send as an envoy to, carries out commutation behaviour
Make；
The judgment method of tri-phase unbalance factor uses IEEE Std 936-1987 standard, select in three-phase phase voltage it is maximum with most
The difference and average phase voltages (V of small VRMS voltage root mean squareav) the ratio between be used as tri-phase unbalance factor:
The smallest objective function of tri-phase unbalance factor are as follows:
Constraint condition are as follows:
K∈{(1 0 0)T,(0 1 0)T,(0 0 1)T(formula three)
IA、IB、IC< Iallow(formula four)
Wherein, K is the switch state of every phase thyristor, and " 1 " indicates that thyristor is open-minded, and " 0 " indicates thyristor shutdown, IallowFor
Three-phase allows current value；
Step 4: the judgement made according to control system exports corresponding switching signal, controls corresponding phase by driving circuit
Turn on thyristors and shutdown, to complete automatic commutation operation when electric car access.Unnecessary software money in order to prevent
To improve utilization efficiency, this control system carries out the judgement of a non-equilibrium among three phase voltages at regular intervals for source waste,
The operation of three-phase voltage autobalance is carried out to the electric car load accessed in this period, and hysteresis comparator is added to prevent
The thyristor of every phase frequently switches on.
Main circuit as shown in Figure 1, the commutation device of this autobalance charging system by bidirectional thyristor 2, bidirectional thyristor 3
It forms with bidirectional thyristor 4, is drawn after in parallel from power grid, the neutrality as one end of charging interface 5, in three-phase four wire system
Line is directly led out, and selects electric car to connect by controlling the switch state of each phase thyristor as the other end of charging interface 5
The phase entered, for the electric car charging of single phase ac charging.
Control system architecture is as shown in Fig. 2, mainly by microprocessor 7, A phase voltage detection circuit 8, B phase-voltage measurement electricity
Road 10, C phase voltage detection circuit 12, A phase current sensing circuit 9, B phase current sensing circuit 11, C phase current sensing circuit 13,
The composition such as virtual value conversion circuit 14, A phase driving circuit 15, B phase driving circuit 16, C phase driving circuit 17.A phase-voltage measurement
Circuit 8, B phase voltage detection circuit 10, C phase voltage detection circuit 12, A phase current sensing circuit 9, B phase current sensing circuit 11
It is responsible for detecting each phase voltage of power grid, current value using D.C mutual-inductor with C phase current sensing circuit 13；Virtual value conversion circuit 14
Voltage, the current signal that will test are converted into virtual value；Microprocessor 7 as AN0~AN5 input terminal receive obtained by signal into
Row operation；A phase driving circuit 15, B phase driving circuit 16, C phase driving circuit 17 receive the control signal of microprocessor 7 and drive
The bidirectional thyristor on or off of dynamic corresponding phase.
Main program flow chart is as shown in figure 3, voltage, current detection circuit detect the electricity of three phase network by D.C mutual-inductor
Pressure, current value, are converted into virtual value through virtual value conversion circuit, input microprocessor, microprocessor is to the three-phase electricity detected
It presses, the virtual value of electric current is sampled, and judges tri-phase unbalance factor.It is moved back when three-phase imbalance is unsatisfactory for requiring using simulation
Fiery optimization algorithm optimizes the switch state of thyristor, and the tri-phase unbalance factor that must send as an envoy to is the smallest switch state, output
Corresponding signal, driving circuit drive turn on thyristors and the shutdown of corresponding phase according to obtained signal, complete automatic commutation behaviour
Make.
Specific implementation method is divided into following four step:
Step 1: detecting each phase voltage using D.C mutual-inductor at regular intervals after electric car accesses power grid, electric current is believed
Number；
Each charging pile introduces a three dimensional vector X, for indicating the switch state of thyristor, i.e., connects when electric car charges
The phase entered, as follows:
In above formula: " 1 " indicates turn on thyristors；" 0 " indicates thyristor shutdown；
The switch state of the charging pile thyristor then to come into operation in charging station can be by a matrix XnIt indicates, wherein n table
Show the number of charging pile；
Assuming that having 9 electric car access charging stations, the random switching state of each phase thyristor in a period of time are as follows:
From the above equation, we can see that before commutation each charging pile thyristor switch state: the 1st electric vehicle accesses A phase, and B, C phase turn off；2nd
Electric vehicle accesses C phase, and A, B phase turn off；3rd electric vehicle accesses A phase, and B, C phase turn off；4th electric vehicle accesses B phase, A, C
Mutually turn off；5th electric vehicle accesses B phase, and A, C phase turn off；6th electric vehicle accesses C phase, and A, B phase turn off；7th electric vehicle
B phase is accessed, A, C phase turn off；8th electric vehicle accesses C phase, and A, B phase turn off；9th electric vehicle accesses B phase, and A, C phase turn off.
Step 2: voltage, the current signal for the AC signal that virtual value conversion circuit will test are converted into virtual value, use
In the judgement of non-equilibrium among three phase voltages and the calculating of every phase power；
Three-phase voltage virtual value can be obtained by establishing simulation model and be respectively as follows: 239.6V, 199.8V, 220.6V；Three-phase current
Virtual value is respectively as follows: 46.39A, 57.91A, 53.32A；
Step 3: microprocessor samples three-phase voltage, the current signal virtual value of input, calculates tri-phase unbalance factor ρu,
And the upper threshold ρ with settingmaxWith bottom threshold ρminIt is compared, works as ρu< ρminWhen, grid voltage three-phase degree of unbalancedness is full
Foot requires, and does not do commutation operation；Work as ρu> ρmaxWhen, power grid is in three-phase imbalance state, using simulated annealing optimization algorithm pair
Thyristor switch state optimizes, and must send as an envoy to the smallest switch state of tri-phase unbalance factor, to carry out commutation operation；
Three-phase voltage, the current effective value obtained using second step, calculate each phase apparent energy be respectively 11.04KVA,
12.50KVA,11.33KVA；
By the judgment method of IEEE Std 936-1987 standard tri-phase unbalance factor, the three-phase voltage before commutation can be obtained is not
The degree of balance:
Non-equilibrium among three phase voltages 18.16% before the commutation known to above formula result are greater than the upper threshold 5% of setting, therefore adopt
Initial switch state is optimized with simulated annealing optimization algorithm；Simulated annealing subprogram is as shown in figure 4, specific packet
It includes as follows:
1) T=T is enabled0, that is, start the initial temperature of annealing, according to initial switch state X0, calculate corresponding three-phase imbalance
Spend ρ (X0)；2) T is enabled to be equal to next value T in Cooling -schedulei；3) according to current switch states XiIt is disturbed, generates one
A new switch state Xj, calculate corresponding tri-phase unbalance factor ρ (Xj), obtain Δ ρ=ρ (Xj)-ρ(Xi)；If 4) Δ ρ < 0,
Then new switch state is received, as new current solution；If Δ ρ > 0, new switch state XjBy probability exp (- Δ ρ/Ti) connect
By TiFor Current Temperatures；5) in temperature TiUnder, repeat LkSecondary disturbance and reception process, i.e. execution step 3 and 4；6) judge that T is
It is no to have reached Tf, it is, then termination algorithm；It is no, then it goes to step 2 and continues to execute.
Switch state after Simulated Anneal Algorithm Optimize are as follows:
From the above equation, we can see that after optimization each charging pile thyristor switch state: the 1st electric vehicle accesses A phase, and B, C phase turn off；2nd
Electric vehicle accesses C phase, and A, B phase turn off；3rd electric vehicle accesses A phase, and B, C phase turn off；4th electric vehicle accesses B phase, A, C
Mutually turn off；5th electric vehicle accesses B phase, and A, C phase turn off；6th electric vehicle accesses C phase, and A, B phase turn off；7th electric vehicle
A phase is accessed, B, C phase turn off；8th electric vehicle accesses B phase, and A, C phase turn off；9th electric vehicle accesses C phase, and A, B phase turn off.
Non-equilibrium among three phase voltages after recalculating optimization are as follows:
Non-equilibrium among three phase voltages are 0.03% less than set bottom threshold 2% at this time, and non-equilibrium among three phase voltages meet
It is required that；
Step 4: the judgement made according to control system exports corresponding switching signal, controls corresponding phase by driving circuit
Turn on thyristors and shutdown, to complete automatic commutation operation when electric car access.Unnecessary software money in order to prevent
Source waste carries out the non-equilibrium among three phase voltages in charging station in this control system every three minutes primary to improve utilization efficiency
Judgement carries out the operation of three-phase voltage autobalance to the electric car load accessed in this period, and joined stagnant ring ratio
Prevent the thyristor of every phase from excessively frequently switching on compared with device.
The present invention devises a kind of electric automobile charging station three-phase voltage autobalance charging system and charging method, passes through
Electric car accesses the phase order of power grid, realizes the autobalance of power grid three-phase voltage, does not need artificial in order to reduce three
Phase degree of unbalancedness goes the phase sequence in selection electric car access three phase network, reduces waste of human resource.
Claims (5)
1. electric automobile charging station three-phase voltage autobalance charging system, which is characterized in that main circuit uses three-phase four-wire system
Network, commutation device are composed in parallel by three groups of bidirectional thyristors；Control circuit in the system is examined by microprocessor, A phase voltage
Slowdown monitoring circuit, B phase voltage detection circuit, C phase voltage detection circuit, A phase current sensing circuit, B phase current sensing circuit, C phase electricity
Current detection circuit, virtual value conversion circuit, A phase driving circuit, B phase driving circuit and C phase driving circuit composition.
2. electric automobile charging station three-phase voltage autobalance charging system according to claim 1, which is characterized in that main
Circuit 1 uses three-phase four-wire system network, and bidirectional thyristor 2, bidirectional thyristor 3 and bidirectional thyristor 4 are respectively connected to power grid A, B, C
Three-phase is drawn after in parallel from power grid, and as one end of charging interface 5, the neutral conductor in three-phase four wire system is directly led out, and is made
For the other end of charging interface 5；By controlling the switch state of each phase thyristor, the phase of electric car access is selected, is single-phase
The electric car of AC charging charges.
3. electric automobile charging station three-phase voltage autobalance charging system according to claim 1, which is characterized in that control
In circuit 6 processed, A phase voltage detection circuit 8, B phase voltage detection circuit 10, C phase voltage detection circuit 12, A phase current sensing electricity
Road 9, B phase current sensing circuit 11 and C phase current sensing circuit 13 are responsible for detecting each phase voltage of power grid, electricity using D.C mutual-inductor
Flow valuve；Voltage that virtual value conversion circuit 14 will test, current signal are converted into virtual value；Microprocessor 7 by AN0~
AN5 input terminal receives gained signal and carries out operation and export control signal；A phase driving circuit 15, B phase driving circuit 16, C phase are driven
The control signal that dynamic circuit 17 receives microprocessor 7 drives the bidirectional thyristor on or off of corresponding phase.
4. the charging method of electric automobile charging station three-phase voltage autobalance charging system described in claim 1, feature
It is, the steps include: voltage detecting circuit, current detection circuit detection power grid three-phase voltage, current signal first, through virtual value
Conversion circuit conversion, then carries out calculation process by microprocessor analogue amount input terminal AN0~AN5 input microprocessor, will
For obtained operation result through output end of microprocessor input driving circuit, last driving circuit drives the turn on thyristors of corresponding phase
Or shutdown, to complete automatic commutation operation when electric car charging.
5. the charging method of electric automobile charging station three-phase voltage autobalance charging system according to claim 4,
It is characterized in that, the steps include:
Step 1: detecting the voltage of each phase with D.C mutual-inductor at regular intervals after electric car accesses power grid, electric current is believed
Number；
Step 2: converting virtual value for the voltage of AC signal, current value using virtual value conversion circuit；
Step 3: microprocessor samples three-phase voltage, the current signal virtual value of input, judges tri-phase unbalance factor ρu,
And the upper threshold ρ with settingmax(5%) and bottom threshold ρmin(2%) it is compared；ρu< ρminWhen, power grid three-phase imbalance
Degree is met the requirements, and does not do commutation operation；Work as ρu> ρmaxWhen, power grid is in three-phase imbalance state, is calculated using simulated annealing optimization
Method optimizes the switch state of thyristor, so that the smallest switch state of tri-phase unbalance factor that must send as an envoy to, carries out commutation behaviour
Make；
The judgment method of tri-phase unbalance factor uses IEEE Std 936-1987 standard, select in three-phase phase voltage it is maximum with most
The difference and average phase voltages (V of small VRMS voltage root mean squareav) the ratio between be used as tri-phase unbalance factor:
The smallest objective function of tri-phase unbalance factor are as follows:
Constraint condition are as follows:
K∈{(1 0 0)T,(0 1 0)T,(0 0 1)T(formula three)
IA、IB、IC< Iallow(formula four)
Wherein, K is the switch state of every phase thyristor, and " 1 " indicates thyristor " open-minded ", and " 0 " indicates thyristor " shutdown ", Iallow
Allow current value for three-phase；
Step 4: the judgement made according to control system exports corresponding signal, and the brilliant lock of corresponding phase is controlled by driving circuit
Pipe on or off, to complete automatic commutation operation when electric car access；This control system carries out at regular intervals
The judgement of non-equilibrium among three phase voltages carries out three-phase voltage to the electric car load for accessing charging station in this period
Autobalance operation, and hysteresis comparator, which is added, prevents the thyristor of every phase from frequently switching on.
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| CN110103735A (en) * | 2019-05-21 | 2019-08-09 | 兰州理工大学 | Electric car optimal charge access point selection method based on MOPSO algorithm |
| CN110797887A (en) * | 2019-09-23 | 2020-02-14 | 南京软核科技有限公司 | Low-voltage transformer area three-phase unbalance management self-decision control method |
| CN111098748A (en) * | 2020-01-14 | 2020-05-05 | 张翼洲 | Automatic voltage stabilization charging pile based on pre-balancing system |
| WO2021000610A1 (en) * | 2019-07-04 | 2021-01-07 | 王振铎 | Voltage balancing and stabilizing apparatus and method |
| CN112290566A (en) * | 2020-11-05 | 2021-01-29 | 张岳 | Three-phase balancing method and system for alternating-current charging pile |
| CN112659941A (en) * | 2020-11-19 | 2021-04-16 | 南京鼎牌电器有限公司 | Ordered balance charging system based on permanent magnet change-over switch |
| CN115133787A (en) * | 2022-07-25 | 2022-09-30 | 四川立业科技有限公司 | Thyristor power regulation control circuit and method |
| EP4098481A1 (en) * | 2021-06-02 | 2022-12-07 | Digital Elektronik GmbH | Method and device for load management in the charging of electric vehicles or in the return of current from electric vehicles back into the network in a system comprising at least two charging stations |
| CN117434357A (en) * | 2023-12-20 | 2024-01-23 | 天津航空机电有限公司 | Angular load balance detection circuit |
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| CN110797887A (en) * | 2019-09-23 | 2020-02-14 | 南京软核科技有限公司 | Low-voltage transformer area three-phase unbalance management self-decision control method |
| CN110797887B (en) * | 2019-09-23 | 2023-09-22 | 南京软核科技有限公司 | Low-voltage area three-phase imbalance treatment self-decision control method |
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| CN112290566A (en) * | 2020-11-05 | 2021-01-29 | 张岳 | Three-phase balancing method and system for alternating-current charging pile |
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| CN117434357A (en) * | 2023-12-20 | 2024-01-23 | 天津航空机电有限公司 | Angular load balance detection circuit |
| CN117434357B (en) * | 2023-12-20 | 2024-04-09 | 天津航空机电有限公司 | Angular load balance detection circuit |
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