CN105337329A - Method and device for controlling three-phase current of charging station - Google Patents
Method and device for controlling three-phase current of charging station Download PDFInfo
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- CN105337329A CN105337329A CN201410390632.3A CN201410390632A CN105337329A CN 105337329 A CN105337329 A CN 105337329A CN 201410390632 A CN201410390632 A CN 201410390632A CN 105337329 A CN105337329 A CN 105337329A
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Abstract
The invention discloses a method and a device for controlling three-phase current of a charging station. The method for controlling three-phase current of the charging station comprises the following steps: detecting the magnitude of the three-phase current; carrying out a comparison according to the detected magnitude of the three-phase current to obtain a comparison result; generating a control switch signal according to the comparison result, wherein the control switch signal is used for controlling balance of the three-phase current; and outputting the control switch signal to a three-phase power supply. Through the method and the device, the problem of high investment when unbalance of the three-phase current is solved in the prior art is solved.
Description
Technical field
The present invention relates to measurement and control area, in particular to a kind of control method for charging station three-phase current and device.
Background technology
Charging station three-phase imbalance is mainly manifested in the three-phase imbalance into the single-phase user of three phase mains.Particularly, it is constant that three-phase imbalance shows as three-phase voltage (about 380V), but single-phase voltage and monophase current imbalance.Wherein, single-phase voltage is uneven is caused by monophase current imbalance.Three-phase current unbalance can cause the generation of following problem:
1, current imbalance can cause charging station transformer to be in higher load condition in some period, such as, particularly serious when winter warms oneself.If a certain phase current is too high, then this phase load may be caused to exceed the rated load of transformer.If a certain phase current overload is serious or surcharge preloading duration is long, then can cause the damage of transformer.
2, current imbalance can cause the potential shift of neutral point (that is, zero line), causes each single-phase voltage centering point current potential to change, that is, cause each phase voltage uneven.The phase voltage that each phase voltage imbalance refers to is high, and some phase voltages are low.When the serious imbalance of three-phase current; can cause the serious imbalance of three-phase voltage, now, the charging voltage of charging pile can be seriously higher or on the low side; cause electric motor car to charge, show as in charging process cannot charge, Automated skip protection, monitor for faults warning etc.).
3, current imbalance can cause the zero-sequence current on zero line excessive, and cause line loss and iron loss to increase, cause electric energy loss to increase, when situation is serious, zero-sequence current can produce eddy current on the transformer, and heating, burns out transformer.
4, a certain phase current can be caused during current imbalance excessive, to such an extent as to exceed sky and open capacity, cause power source trip.
Wherein, when three-phase current unbalance, the customer charge of every phase can be adjusted to balance.In fact, the three phase mains of charging station is when configuring, the mean allocation load of every phase power supply, but, because the charging interval section of each charging pile is random, cause at the load of a certain phase power supply of different time periods excessive, and every day is different at the load maximal phase of different time sections, the degree of unbalance size of electric current is not identical yet, such as, vehicle maintenance, driver is temporarily busy, the factors such as sport car distance length all can cause charging in intervals to change, and then cause the degree of unbalance size of electric current also not identical, therefore, charging station is difficult to accomplish to remain that the power load of every phase power supply is in poised state in actual motion.
At present, in the related, in order to solve three-phase current unbalance, adopting and first three phase mains being carried out rectification, then be a cross streams electricity by its inversion, all charging pile unifications are charged by one group of power supply; And office, kitchen etc. need three phase mains environment in, load can directly by before inverter three phase mains supply.Although this scheme can solve three-phase current unbalance problem, the investment of high-power inverter is very high.
As shown in Figure 1, can be first the single-phase electricity of 220V/50Hz by A, B, C three-phase electricity of 380V/50Hz by inverter inversion, then the single-phase electricity of the 220V/50Hz after inversion is supplied to user.
For in correlation technique solve three-phase current unbalance time, invest high problem, not yet propose effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of control method for charging station three-phase current and device, with solve in correlation technique solve three-phase current unbalance time, invest high problem.
To achieve these goals, according to an aspect of the present invention, a kind of control method for charging station three-phase current is provided.The method comprises: the size detecting three-phase current; Size according to the three-phase current detected compares, and obtains comparative result; Generate control switch signal according to comparative result, wherein, control switch signal is for controlling three-phase balance; And to three phase mains output control switch signal.
Further, size according to the three-phase current detected compares, obtain comparative result to comprise: the size according to the three-phase current detected compares, obtain the electric current phase that maximum current is corresponding, generate control switch signal according to comparative result and comprise: generate control switch signal mutually according to electric current.
Further, while generating control switch signal according to comparative result, this control method also comprises: generate current compensation signal according to comparative result, wherein, current compensation signal is for compensating the electric current of minimum current phase; With to minimum current phase output current compensating signal.
Further, size according to the three-phase current detected compares, obtain comparative result to comprise: the size according to the three-phase current detected compares, obtain the degree of unbalance of three-phase current, wherein, the degree of unbalance of three-phase current is the uneven degree of three-phase current, generates current compensation signal comprise according to comparative result: the degree of unbalance according to three-phase current generates current compensation signal.
Further, after three phase mains output control switch signal, this control method also comprises: control switch signal control relay is opened, and relay is for controlling the relevant position of four lines of inductance and electric capacity access three phase mains.
To achieve these goals, according to a further aspect in the invention, a kind of control device for charging station three-phase current is provided.This device comprises: detecting unit, for detecting the size of three-phase current; Comparing unit, for comparing according to the size of the three-phase current detected, obtains comparative result; First generation unit, for generating control switch signal according to comparative result, wherein, control switch signal is for controlling three-phase balance; And output unit, for three phase mains output control switch signal.
Further, comparing unit also for comparing according to the size of the three-phase current detected, obtains the electric current phase that maximum current is corresponding; And first generation unit also for generating control switch signal mutually according to electric current.
Further, this control device also comprises: the second generation unit, and for while generating control switch signal according to comparative result, generate current compensation signal according to comparative result, wherein, current compensation signal is for compensating the electric current of minimum current phase; And output unit is also for minimum current phase output current compensating signal.
Further, comparing unit is also for comparing according to the size of the three-phase current detected, obtain the degree of unbalance of three-phase current, wherein, the degree of unbalance of three-phase current is the uneven degree of three-phase current, and the second generation unit also generates current compensation signal for the degree of unbalance according to three-phase current.
Further, this control device also comprises: control unit, and for after three phase mains output control switch signal, control switch signal control relay is opened, and relay is for controlling the relevant position of four lines of inductance and electric capacity access three phase mains.
By the present invention, adopt the size detecting three-phase current; Size according to the three-phase current detected compares, and obtains comparative result; Generate control switch signal according to comparative result, wherein, control switch signal is for controlling three-phase balance; And to three phase mains output control switch signal, solving in correlation technique when solving three-phase current unbalance, investing high problem, and then reach low cost and solve the effect of three-phase current unbalance.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram solving three-phase balance according to the inverter of correlation technique.
Fig. 2 is the schematic diagram of the control device for charging station three-phase current according to the embodiment of the present invention;
Fig. 3 is the schematic diagram controlling three-phase balance according to the controller of the embodiment of the present invention;
Fig. 4 is the schematic diagram of inductance according to the embodiment of the present invention, capacitance compensation electric current;
Fig. 5 (a) is the schematic diagram compensated according to the A phase maximum current of the embodiment of the present invention;
Fig. 5 (b) is the schematic diagram compensated according to the B phase maximum current of the embodiment of the present invention;
Fig. 5 (c) is the schematic diagram compensated according to the C phase maximum current of the embodiment of the present invention;
Fig. 6 is the circuit diagram of the capacitor and inductor group switching according to the embodiment of the present invention; And
Fig. 7 is the flow chart of the control method for charging station three-phase current according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Better the present invention program is understood in order to make those skilled in the art, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment obtained under those of ordinary skill in the art do not make creative work prerequisite, all should belong to protection scope of the present invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, and intention is to cover not exclusive comprising.
According to embodiments of the invention, provide a kind of control device for charging station three-phase current, this control device being used for charging station three-phase current, for regulating charging station three-phase current, makes it keep balance.
Fig. 2 is the schematic diagram of the control device for charging station three-phase current according to the embodiment of the present invention.
As shown in Figure 2, this device comprises: detecting unit 10, comparing unit 20, first generation unit 30 and output unit 40.
Detecting unit 10 is for detecting the size of three-phase current; Comparing unit 20, for comparing according to the size of the three-phase current detected, obtains comparative result; First generation unit 30 is for generating control switch signal according to comparative result, and wherein, control switch signal is for controlling three-phase balance; And output unit 40 is for three phase mains output control switch signal.
In embodiments of the present invention, by detecting the size of three-phase current, the size according to the three-phase current detected compares, and obtains comparative result; Generate control switch signal according to comparative result, wherein, control switch signal is for controlling three-phase balance; And to three phase mains output control switch signal, low cost can be reached and solve three-phase current unbalance.
It should be noted that, above-mentioned steps adopts controller to control to perform.Wherein, when detecting the three-phase current of power supply, can be detected by current sensor, such as, every phase power line arranges a current sensor respectively, this current sensor can detect the electric current in corresponding phase line in real time.After the electric current in each phase line being detected, can be stored in corresponding memory.When relatively three-phase current, the size of three-phase current can be compared, or the size of three-phase current and preset value can be compared.Such as, after the magnitude relationship relatively between three-phase current, control switch signal can be generated, and to be opened by control switch signal control relay or closed, and then open by control relay or close and control three-phase balance.It should be noted that, relay may be used for the relevant position controlling inductance and electric capacity access three-phase and four-line, and wherein, inductance and electric capacity can compensate the electric current in corresponding phase line.
Preferably, in the invention process, comparing unit 20 also for comparing according to the size of the three-phase current detected, obtains the electric current phase that maximum current is corresponding; And first generation unit 30 also for generating control switch signal mutually according to electric current.
It should be noted that, the control switch signal in electric current phase line corresponding to maximum current can be generated, and shield the control switch signal in other two phase lines.Control switch signal may be used for the relay that firing current phase line is arranged, and wherein, relay can be solid-state relay.
Preferably, in the invention process, this control device can also comprise: the second generation unit and output unit.Second generation unit is used for while generating control switch signal according to comparative result, and generate current compensation signal according to comparative result, wherein, current compensation signal is for compensating the electric current of minimum current phase; And output unit is also for minimum current phase output current compensating signal.
The degree of unbalance of three-phase current can comprise the first degree of unbalance and the second degree of unbalance, wherein, the two-wheeled that carries out of three-phase current can be compared.The first round relatively in, three-phase current and the first preset value can be compared, if the biphase current in three-phase current is all greater than the first preset value, and another phase current is less than this first preset value, then three-phase current unbalance, and degree of unbalance is the first degree of unbalance; Take turns relatively second, three-phase current and the second preset value can be compared, if the biphase current in three-phase current is all greater than the second preset value, and another phase current is less than this second preset value, then three-phase current unbalance, and degree of unbalance is the second degree of unbalance.First degree of unbalance is higher than the second degree of unbalance, and the first preset value is greater than the second preset value.
Preferably, in the invention process, comparing unit 20 is also for comparing according to the size of the three-phase current detected, obtain the degree of unbalance of three-phase current, wherein, the degree of unbalance of three-phase current is the uneven degree of three-phase current, and the second generation unit also generates current compensation signal for the degree of unbalance according to three-phase current.
Preferably, in the invention process, this control device can also comprise: control unit.Control unit, for after three phase mains output control switch signal, control switch signal control relay is opened, and relay is for controlling the relevant position of four lines of inductance and electric capacity access three phase mains.
It should be noted that, four lines of three phase mains refer to A, B, C phase line and zero line.
In embodiments of the present invention, the size of every phase current of three phase mains is detected in real time by controller, and judge the degree of unbalance of three-phase current, when degree of unbalance meets specified conditions, generate control switch signal, and by control switch signal controlling inductor and Capacitor banks access three-phase and four-line circuit, thus biphase current less for current capacity is compensated in maximum current phase line, or by the current compensation in minimum for current capacity phase line in the larger two-phase of electric current, realize the relative equilibrium of three-phase current.From charging station practical operation situation, a phase current is excessive, and the situation that another biphase current is relatively little is comparatively general, elaborates current compensation principle below as example.
First, detected the size of three-phase current by controller, it should be noted that, in testing process, power frequency is certain; Then carry out the comparison of three-phase current according to detection data, judge degree of unbalance size and the maximum phase current of electric current, finally export a control switch signal.A, B, C three-phase current signal relatively can be divided into two grades, that is, the degree of unbalance that two are different can be divided into.Such as, when first time compares, first can judge whether the preset value (as 100 amperes) that the electric current of any two-phase is larger more than first, if exceeded, then export a big current compensating signal, then the electric current comparing which phase maximum (as maximum in A phase), then export control switch signal corresponding to a maximum phase current (A relative current), wherein, all the other control switch signals all shield.If the preset value that the electric current of more any two-phase is not larger more than first for the first time, but be greater than second less preset value (as 50 amperes), then export a small area analysis compensating signal, compare which phase current maximum (in this way A phase) equally again, also export control switch signal corresponding to an electric maximal phase stream (A phase current), all the other control switch signals all shield.If the preset value that the electric current of two-phase is all not little more than second arbitrarily, shows that three-phase current compares balance, does not then produce any control switch signal, that is, all control switch signals conductively-closed.There are control switch signal and 3 phase controlling switch signals of 2 current compensations (being greater than 100 amperes, 50 ~ 100 amperes) like this.Start corresponding one group of solid-state relay according to the switching signal produced, drop into suitable inductance and Capacitor banks in corresponding A, B, C, N tetra-phase lines, thus solve the three-phase imbalance problem because load causes at random.As shown in Figure 3, PLC detects the phase current in A, B, C triple line, and by A phase control signal, B phase control signal, C phase control signal and big current compensating signal and small area analysis compensation signal control A, B, C three-phase balance.
The principle of inductance and capacitance compensation electric current as shown in Figure 4.Wherein, N represents neutral point (zero line), and Ua represents A phase voltage, and Ub represents B phase voltage, and Uc represents C phase voltage, and A, B are in parallel an electric capacity C2, and A, C are in parallel an inductance L 2.If A phase current is excessive, the electric current of B, C phase is less, then access shunt capacitance C2 in A, B phase, accesses shunt inductance L2 in A, C phase simultaneously.Due to inductance phase shift 90 ° backward, electric capacity is phase shift 90 ° forward, like this, the capacitance compensation active current IaCr transfer of A phase becomes the active current IbCr of B phase, the inductance compensation active current IaLr transfer of A phase becomes the active current IcLr of C phase, the result that inductance capacitance compensates is that A phase current reduces, and the electric current of B, C phase increases.After inductance, capacitance compensation, the reactive current IaLs produced in A phase and IaCs direction contrary (180 °), by controlling inductance, capacitance compensation size of current is equal, then cancel out each other in the reactive current of A phase.The reactive current that B phase produces is IbCs, by an electric capacity in parallel between B phase with zero line N, produces a reactive current IbL1, its direction is contrary with IbCs, select suitable L1 inductance value, make IbL1 and IbCs equal and opposite in direction, the reactive current in B phase can be offset.In like manner, to be in parallel an electric capacity at C, reactive current IcLs and the IcC1 produced in C phase can be made to offset.After the compensation of inductance and capacitance group, only carry out the transfer of active current between three-phase, reached the object that B, C phase compensates A phase.The too high compensation principle of other phase current is identical.One phase compensates the principle of two-phase by that analogy, does not repeat them here.
The maximum compensation principle of A, B, C three-phase current respectively as shown in Fig. 5 (a) ~ 5 (c), wherein, in (a) figure, C1 is connected in parallel between C, N phase line, C2 is connected in parallel between A, B phase line, and L1 is connected in parallel between B, N phase line, and L2 is connected in parallel between A, C phase line; B, in () figure, C1 is connected in parallel between A, N phase line, C2 is connected in parallel between B, C phase line, and L1 is connected in parallel between C, N phase line, and L2 is connected in parallel between A, B phase line; C, in () figure, C1 is connected in parallel between B, N phase line, C2 is connected in parallel between A, C phase line, and L1 is connected in parallel between A, N phase line, and L2 is connected in parallel between B, C phase line.
Impulse current due to inductance capacitance switching and when disconnecting is comparatively large, therefore must adopt the mode that operating passing zero and zero passage disconnect, and the switching of inductance and electric capacity adopts high power solid state relay to realize with disconnecting.As shown in Figure 6, relay K J-1, according to A phase controlling switch signal controlling J-1, J-2 and L1-1, L2-1 and C1-1, C2-1 action, realizes A current compensation.Relay K J-2, according to B phase controlling switch signal controlling J-3, J-4 and L1-1, L2-1 and C1-1, C2-1 action, realizes B phase current and compensates.Relay K J-3, according to C phase controlling switch signal controlling J-5, J-6 and L1-1, L2-1 and C1-1, C2-1 action, realizes C phase current and compensates.Relay K J-4, according to big current control switch signal controlling J-7 and L1-2, L2-2 and C1-2, C2-2 action, realizes corresponding phase current and compensates.Relay K J-5, according to Small current control switching signal control J-8 and L1-3, L2-3 and C1-3, C2-3 action, realizes corresponding phase current and compensates.
According to embodiments of the invention, provide a kind of control method for charging station three-phase current, this control method being used for charging station three-phase current, for regulating charging station three-phase current, makes it keep balance.This control method for charging station three-phase current may operate in computer-processing equipment.It should be noted that, the control method for charging station three-phase current that the embodiment of the present invention provides can be performed by the control device for charging station three-phase current of the embodiment of the present invention, and the control device for charging station three-phase current of the embodiment of the present invention also may be used for the control method for charging station three-phase current performing the embodiment of the present invention.
Fig. 7 is the flow chart of the control method for charging station three-phase current according to the embodiment of the present invention.
As shown in Figure 7, the method comprises following step S702 to step S708:
Step S702, detects the size of three-phase current.
Step S704, the size according to the three-phase current detected compares, and obtains comparative result.
Step S706, generate control switch signal according to comparative result, wherein, control switch signal is for controlling three-phase balance.
Step S708, to three phase mains output control switch signal.
In embodiments of the present invention, by detecting the size of three-phase current, the size according to the three-phase current detected compares, and obtains comparative result; Generate control switch signal according to comparative result, wherein, control switch signal is for controlling three-phase balance; And to three phase mains output control switch signal, low cost can be reached and solve three-phase current unbalance.
It should be noted that, above-mentioned steps adopts controller to control to perform.Wherein, when detecting the three-phase current of power supply, can be detected by current sensor, such as, every phase power line arranges a current sensor respectively, this current sensor can detect the electric current in corresponding phase line in real time.After the electric current in each phase line being detected, can be stored in corresponding memory.When relatively three-phase current, the size of three-phase current can be compared, or the size of three-phase current and preset value can be compared.Such as, after the magnitude relationship relatively between three-phase current, control switch signal can be generated, and to be opened by control switch signal control relay or closed, and then open by control relay or close and control three-phase balance.It should be noted that, relay may be used for the relevant position controlling inductance and electric capacity access three-phase and four-line, and wherein, inductance and electric capacity can compensate the electric current in corresponding phase line.
Preferably, in embodiments of the present invention, size according to the three-phase current detected compares, obtain comparative result to comprise: the size according to the three-phase current detected compares, obtain the electric current phase that maximum current is corresponding, generate control switch signal according to comparative result and comprise: generate control switch signal mutually according to electric current.
It should be noted that, the control switch signal in electric current phase line corresponding to maximum current can be generated, and shield the control switch signal in other two phase lines.Control switch signal may be used for the relay that firing current phase line is arranged, and wherein, relay can be solid-state relay.
Preferably, in embodiments of the present invention, while generating control switch signal according to comparative result, this control method can also comprise:
S2, generate current compensation signal according to comparative result, wherein, current compensation signal is for compensating the electric current of minimum current phase.
S4, to minimum current phase output current compensating signal.
Preferably, in embodiments of the present invention, size according to the three-phase current detected compares, obtain comparative result to comprise: the size according to the three-phase current detected compares, obtain the degree of unbalance of three-phase current, wherein, the degree of unbalance of three-phase current is the uneven degree of three-phase current, generates current compensation signal comprise according to comparative result: the degree of unbalance according to three-phase current generates current compensation signal.
The degree of unbalance of three-phase current can comprise the first degree of unbalance and the second degree of unbalance, wherein, the two-wheeled that carries out of three-phase current can be compared.The first round relatively in, three-phase current and the first preset value can be compared, if the biphase current in three-phase current is all greater than the first preset value, and another phase current is less than this first preset value, then three-phase current unbalance, and degree of unbalance is the first degree of unbalance; Take turns relatively second, three-phase current and the second preset value can be compared, if the biphase current in three-phase current is all greater than the second preset value, and another phase current is less than this second preset value, then three-phase current unbalance, and degree of unbalance is the second degree of unbalance.First degree of unbalance is higher than the second degree of unbalance, and the first preset value is greater than the second preset value.
Preferably, in embodiments of the present invention, after three phase mains output control switch signal, this control method also comprises:
S6, control switch signal control relay is opened, and relay is for controlling the relevant position of four lines of inductance and electric capacity access three phase mains.
It should be noted that, four lines of three phase mains refer to A, B, C phase line and zero line.
In embodiments of the present invention, the size of every phase current of three phase mains is detected in real time by controller, and judge the degree of unbalance of three-phase current, when degree of unbalance meets specified conditions, generate control switch signal, and by control switch signal controlling inductor and Capacitor banks access three-phase and four-line circuit, thus biphase current less for current capacity is compensated in maximum current phase line, or by the current compensation in minimum for current capacity phase line in the larger two-phase of electric current, realize the relative equilibrium of three-phase current.From charging station practical operation situation, a phase current is excessive, and the situation that another biphase current is relatively little is comparatively general, elaborates current compensation principle below as example.
First, detected the size of three-phase current by controller, it should be noted that, in testing process, power frequency is certain; Then carry out the comparison of three-phase current according to detection data, judge degree of unbalance size and the maximum phase current of electric current, finally export a control switch signal.A, B, C three-phase current signal relatively can be divided into two grades, that is, the degree of unbalance that two are different can be divided into.Such as, when first time compares, first can judge whether the preset value (as 100 amperes) that the electric current of any two-phase is larger more than first, if exceeded, then export a big current compensating signal, then the electric current comparing which phase maximum (as maximum in A phase), then export control switch signal corresponding to a maximum phase current (A relative current), wherein, all the other control switch signals all shield.If the preset value that the electric current of more any two-phase is not larger more than first for the first time, but be greater than second less preset value (as 50 amperes), then export a small area analysis compensating signal, compare which phase current maximum (in this way A phase) equally again, also export control switch signal corresponding to an electric maximal phase stream (A phase current), all the other control switch signals all shield.If the preset value that the electric current of two-phase is all not little more than second arbitrarily, shows that three-phase current compares balance, does not then produce any control switch signal, that is, all control switch signals conductively-closed.There are control switch signal and 3 phase controlling switch signals of 2 current compensations (being greater than 100 amperes, 50 ~ 100 amperes) like this.Start corresponding one group of solid-state relay according to the switching signal produced, drop into suitable inductance and Capacitor banks in corresponding A, B, C, N tetra-phase lines, thus solve the three-phase imbalance problem because load causes at random.As shown in Figure 3, PLC detects the phase current in A, B, C triple line, and by A phase control signal, B phase control signal, C phase control signal and big current compensating signal and small area analysis compensation signal control A, B, C three-phase balance.
The principle of inductance and capacitance compensation electric current as shown in Figure 4.Wherein, N represents neutral point (zero line), and Ua represents A phase voltage, and Ub represents B phase voltage, and Uc represents C phase voltage, and A, B are in parallel an electric capacity C2, and A, C are in parallel an inductance L 2.If A phase current is excessive, the electric current of B, C phase is less, then access shunt capacitance C2 in A, B phase, accesses shunt inductance L2 in A, C phase simultaneously.Due to inductance phase shift 90 ° backward, electric capacity is phase shift 90 ° forward, like this, the capacitance compensation active current IaCr transfer of A phase becomes the active current IbCr of B phase, the inductance compensation active current IaLr transfer of A phase becomes the active current IcLr of C phase, the result that inductance capacitance compensates is that A phase current reduces, and the electric current of B, C phase increases.After inductance, capacitance compensation, the reactive current IaLs produced in A phase and IaCs direction contrary (180 °), by controlling inductance, capacitance compensation size of current is equal, then cancel out each other in the reactive current of A phase.The reactive current that B phase produces is IbCs, by an electric capacity in parallel between B phase with zero line N, produces a reactive current IbL1, its direction is contrary with IbCs, select suitable L1 inductance value, make IbL1 and IbCs equal and opposite in direction, the reactive current in B phase can be offset.In like manner, to be in parallel an electric capacity at C, reactive current IcLs and the IcC1 produced in C phase can be made to offset.After the compensation of inductance and capacitance group, only carry out the transfer of active current between three-phase, reached the object that B, C phase compensates A phase.The too high compensation principle of other phase current is identical.One phase compensates the principle of two-phase by that analogy, does not repeat them here.
The maximum compensation principle of A, B, C three-phase current respectively as shown in Fig. 5 (a) ~ 5 (c), wherein, in (a) figure, C1 is connected in parallel between C, N phase line, C2 is connected in parallel between A, B phase line, and L1 is connected in parallel between B, N phase line, and L2 is connected in parallel between A, C phase line; B, in () figure, C1 is connected in parallel between A, N phase line, C2 is connected in parallel between B, C phase line, and L1 is connected in parallel between C, N phase line, and L2 is connected in parallel between A, B phase line; C, in () figure, C1 is connected in parallel between B, N phase line, C2 is connected in parallel between A, C phase line, and L1 is connected in parallel between A, N phase line, and L2 is connected in parallel between B, C phase line.
Impulse current due to inductance capacitance switching and when disconnecting is comparatively large, therefore must adopt the mode that operating passing zero and zero passage disconnect, and the switching of inductance and electric capacity adopts high power solid state relay to realize with disconnecting.As shown in Figure 6, relay K J-1, according to A phase controlling switch signal controlling J-1, J-2 and L1-1, L2-1 and C1-1, C2-1 action, realizes A current compensation.Relay K J-2, according to B phase controlling switch signal controlling J-3, J-4 and L1-1, L2-1 and C1-1, C2-1 action, realizes B phase current and compensates.Relay K J-3, according to C phase controlling switch signal controlling J-5, J-6 and L1-1, L2-1 and C1-1, C2-1 action, realizes C phase current and compensates.Relay K J-4, according to big current control switch signal controlling J-7 and L1-2, L2-2 and C1-2, C2-2 action, realizes corresponding phase current and compensates.Relay K J-5, according to Small current control switching signal control J-8 and L1-3, L2-3 and C1-3, C2-3 action, realizes corresponding phase current and compensates.
As can be seen from the above description, present invention achieves following technique effect:
The serious imbalance of three-phase current may cause zero-sequence current excessive, cause zero line potential shift, show as too high (as more than 260v) that phase voltage has, some brownouts (as below 190v), thus cause automobile to charge or to report to the police; And cause certain phase power to exceed transformer rated power, cause transformer to damage; And cause line loss to strengthen, ammeter metering is inaccurate, waste electric energy; And cause sky to open Frequent trip; And three-phase current unbalance causes overtension, it is abnormal to cause that charging pile relay burns, mainboard and display screen etc. burn, damage or work, increase charging pile maintenance and repair workload and expense, pass through the embodiment of the present invention, due to three-phase balance can be carried out, avoid the generation of above-mentioned situation.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. for a control method for charging station three-phase current, it is characterized in that, comprising:
Detect the size of three-phase current;
Size according to the described three-phase current detected compares, and obtains comparative result;
Generate control switch signal according to described comparative result, wherein, described control switch signal is for controlling described three-phase balance; And
Described control switch signal is exported to three phase mains.
2. control method according to claim 1, is characterized in that,
Size according to the described three-phase current detected compares, and obtains comparative result and comprises: the size according to the described described three-phase current detected compares, and obtains the electric current phase that maximum current is corresponding,
Generate control switch signal according to described comparative result to comprise: generate described control switch signal mutually according to described electric current.
3. control method according to claim 1, is characterized in that, while generating control switch signal according to described comparative result, described control method also comprises:
Generate current compensation signal according to described comparative result, wherein, described current compensation signal is for compensating the electric current of minimum current phase; And
Described current compensation signal is exported mutually to described minimum current.
4. control method according to claim 3, is characterized in that,
Size according to the described three-phase current detected compares, obtain comparative result to comprise: the size according to the described described three-phase current detected compares, obtain the degree of unbalance of described three-phase current, wherein, the degree of unbalance of described three-phase current is the uneven degree of described three-phase current
Generate current compensation signal according to described comparative result to comprise: generate described current compensation signal according to the degree of unbalance of described three-phase current.
5. control method according to claim 1, is characterized in that, after export described control switch signal to three phase mains, described control method also comprises:
Described control switch signal control relay is opened, and described relay is for controlling the relevant position of four lines of inductance and electric capacity access three phase mains.
6. for a control device for charging station three-phase current, it is characterized in that, comprising:
Detecting unit, for detecting the size of three-phase current;
Comparing unit, for comparing according to the size of the described three-phase current detected, obtains comparative result;
First generation unit, for generating control switch signal according to described comparative result, wherein, described control switch signal is for controlling described three-phase balance; And
Output unit, for exporting described control switch signal to three phase mains.
7. control device according to claim 6, is characterized in that, described comparing unit also compares for the size of the described three-phase current detected described in basis, obtains the electric current phase that maximum current is corresponding; And
Described first generation unit is also for generating described control switch signal mutually according to described electric current.
8. control device according to claim 6, is characterized in that, also comprises:
Second generation unit, for while generating control switch signal according to described comparative result, generate current compensation signal according to described comparative result, wherein, described current compensation signal is for compensating the electric current of minimum current phase; And
Described output unit is also for exporting described current compensation signal mutually to described minimum current.
9. control device according to claim 8, is characterized in that,
Described comparing unit also compares for the size of the described three-phase current detected described in basis, obtains the degree of unbalance of described three-phase current, and wherein, the degree of unbalance of described three-phase current is the uneven degree of described three-phase current,
Described second generation unit is also for generating described current compensation signal according to the degree of unbalance of described three-phase current.
10. control device according to claim 6, is characterized in that, also comprises:
Control unit, for after export described control switch signal to three phase mains, described control switch signal control relay is opened, and described relay is for controlling the relevant position of four lines of inductance and electric capacity access three phase mains.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106887856A (en) * | 2017-03-06 | 2017-06-23 | 天津平高智能电气有限公司 | Three-phase imbalance adjustment control method, device and three-phase imbalance regulating system |
| CN107257135A (en) * | 2017-07-17 | 2017-10-17 | 国网江西省电力公司电力科学研究院 | Decision method, device and the equipment of a kind of uneven control measures in power distribution station |
| CN108599204A (en) * | 2018-05-30 | 2018-09-28 | 河海大学 | A kind of power distribution station three-phase imbalance adjusted stepwise method |
| CN109768558A (en) * | 2018-12-19 | 2019-05-17 | 国网北京市电力公司 | The three-phase load adjusting method and device of charging pile |
| CN114255612A (en) * | 2021-12-20 | 2022-03-29 | 深圳市爱拓物联技术有限公司 | Charging pile parking space management and control method and device, computer equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106887856A (en) * | 2017-03-06 | 2017-06-23 | 天津平高智能电气有限公司 | Three-phase imbalance adjustment control method, device and three-phase imbalance regulating system |
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| CN107257135B (en) * | 2017-07-17 | 2020-02-28 | 国网江西省电力公司电力科学研究院 | Method, device and equipment for judging unbalance treatment measures of power distribution area |
| CN108599204A (en) * | 2018-05-30 | 2018-09-28 | 河海大学 | A kind of power distribution station three-phase imbalance adjusted stepwise method |
| CN109768558A (en) * | 2018-12-19 | 2019-05-17 | 国网北京市电力公司 | The three-phase load adjusting method and device of charging pile |
| CN114255612A (en) * | 2021-12-20 | 2022-03-29 | 深圳市爱拓物联技术有限公司 | Charging pile parking space management and control method and device, computer equipment and storage medium |
| CN114255612B (en) * | 2021-12-20 | 2023-02-28 | 深圳市爱拓物联技术有限公司 | Charging pile parking space management and control method and device, computer equipment and storage medium |
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