CN118473063B - Charging system, energy storage system and vehicle - Google Patents
Charging system, energy storage system and vehicle Download PDFInfo
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- CN118473063B CN118473063B CN202410934585.8A CN202410934585A CN118473063B CN 118473063 B CN118473063 B CN 118473063B CN 202410934585 A CN202410934585 A CN 202410934585A CN 118473063 B CN118473063 B CN 118473063B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 62
- 230000001629 suppression Effects 0.000 claims abstract description 52
- 238000011217 control strategy Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 30
- 230000005284 excitation Effects 0.000 claims description 19
- 230000005764 inhibitory process Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 9
- 230000006870 function Effects 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 5
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
- B60L53/53—Batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
-
- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a charging system, an energy storage system and a vehicle, and belongs to the field of charging. The charging system comprises a switching tube module and an active leakage current suppression circuit, wherein the switching tube module is connected between a power grid and an energy storage device, the active leakage current suppression circuit is respectively connected with a ground wire of the power grid and the switching tube module, and the active leakage current suppression circuit is used for generating reverse leakage current which is not more than a target range in difference degree of the amplitude of leakage current in the charging system and is opposite in phase. The charging system provided by the application combines a symmetrical switch control strategy and a switch tube module multiplexing strategy to effectively realize power frequency leakage current inhibition and high frequency leakage current inhibition, and has the advantages of simple structure, low control complexity, low design cost, higher reliability and wide application range.
Description
Technical Field
The application belongs to the field of charging, and particularly relates to a charging system, an energy storage system and a vehicle.
Background
For a non-isolated electric vehicle Charger (On-board Charger, OBC), since the ac side is directly connected with the dc side, a common mode voltage caused by the ac input power grid side and the high-frequency switch can charge and discharge the safety Y capacitor and the distributed Y capacitor existing in the circuit to form a common mode current, that is, a leakage current, if the value of the leakage current exceeds a detection threshold, the external charging device can interrupt a charging flow, thereby affecting user experience. In the related art, an effective leakage current suppressing method is lacking, and the leakage current suppressing cost is high.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the charging system, the energy storage system and the vehicle can effectively realize power frequency leakage current inhibition and high frequency leakage current inhibition, and are simple in structure, low in control complexity, low in design cost, high in reliability and wide in application range.
In a first aspect, the present application provides a charging system comprising:
the switching tube module is connected between the power grid and the energy storage device;
And the active leakage current suppression circuit is respectively connected with the ground wire of the power grid and the switch tube module and is used for generating reverse leakage current with the amplitude difference degree of the leakage current in the charging system not exceeding a target range and opposite in phase.
According to the charging system disclosed by the application, the power frequency leakage current inhibition and the high-frequency leakage current inhibition are effectively realized by combining the symmetrical switch control strategy and the switch tube module multiplexing strategy, and the charging system is simple in structure, low in control complexity and low in design cost, and has higher reliability and wide application scenes.
According to one embodiment of the application, the switching tube module comprises:
The main switch tube module is connected between the power grid and the energy storage device;
The auxiliary switching tube module is connected between the power grid and the energy storage device and used for providing an excitation source for the active leakage current suppression circuit;
the main switching tube module and the auxiliary switching tube module are connected in parallel.
According to an embodiment of the present application, the switching tube module further includes:
The first inductance module and the main switch tube module are sequentially connected between the power grid and the energy storage device.
According to one embodiment of the application, the main switching tube module comprises a first main switching module and a second main switching module connected in parallel, the first inductance module comprises a second inductance and a third inductance,
The first main switch module comprises a first sub switch and a second sub switch which are connected in series, and the midpoint between the first sub switch and the second sub switch is connected with a first phase line of the charging system through the second inductor;
The second main switch module comprises a third sub-switch and a fourth sub-switch which are connected in series, and a midpoint between the third sub-switch and the fourth sub-switch is connected with a second phase line of the charging system through the third inductor.
According to one embodiment of the application, the inductance value of the second inductance and the third inductance is the same.
According to one embodiment of the application, the main switching tube module adopts a symmetrical switching control strategy for inhibiting high-frequency leakage current in the charging system.
According to an embodiment of the present application, the switching tube module further includes:
the second inductance module and the auxiliary switching tube module are sequentially connected between the power grid and the energy storage device, and the second inductance module and the auxiliary switching tube module are connected with the active leakage current suppression circuit.
According to one embodiment of the application, the auxiliary switching tube module comprises a first auxiliary switching module and a second auxiliary switching module connected in parallel, the second inductance module comprising a fourth inductance and a fifth inductance, wherein,
The first auxiliary switch module comprises a fifth sub switch and a sixth sub switch which are connected in series, and the midpoint between the fifth sub switch and the sixth sub switch is connected with a third phase line of the charging system and the input end of the active leakage current suppression circuit through the fourth inductor;
the second auxiliary switch module comprises a seventh sub-switch and an eighth sub-switch which are connected in series, and a midpoint between the seventh sub-switch and the eighth sub-switch is connected with the third phase line and the input end of the active leakage current suppression circuit through the fifth inductor.
According to one embodiment of the application, the inductance of the fourth inductor and the inductance of the fifth inductor are the same, and the inductance of the fourth inductor is twice the inductance of the second inductor.
According to an embodiment of the present application, the active leakage current suppressing circuit includes:
The input end of the power supply device is connected with two input ends of an auxiliary switching tube module included in the switching tube module;
The primary side of the first transformer is connected with the power supply device;
and the first end of the secondary side of the first transformer is connected with the ground wire through the first Y capacitor, and the second end of the secondary side is connected with the phase line and the zero line of the charging system.
According to an embodiment of the present application, the power supply device includes:
The output end of the fourth filter is connected with the primary side of the first transformer, and the input end of the third low-pass filter is connected with a fourth inductor and a fifth inductor which are included in the auxiliary switching tube module;
and the fourth switch is connected with the two input ports of the third low-pass filter in parallel, and the fourth switch is arranged between the two input ends of the auxiliary switching tube module.
According to one embodiment of the present application, further comprising:
The charging system comprises a plurality of first switches, wherein the first switches are respectively arranged on a plurality of phase lines and zero lines of the charging system;
The fourth capacitors are arranged between the target phase line and the zero line, and one end of each fourth capacitor connected with the zero line is also connected with the active leakage current suppression circuit.
According to one embodiment of the present application, further comprising:
And the common mode inductance module is connected between the power grid and the switching tube module and is arranged on a phase line of the charging system.
According to one embodiment of the application, the switching tube module adopts a symmetrical switching control strategy.
In a second aspect, the present application provides an energy storage system comprising:
An energy storage device;
The charging system of the first aspect, the charging system being configured to be connected between a power grid and the energy storage device.
In a third aspect, the present application provides a vehicle comprising:
the energy storage system of the second aspect.
According to the vehicle, the power frequency leakage current suppression and the high-frequency leakage current suppression are effectively realized by arranging the switching tube module and the active leakage current suppression circuit and combining the symmetrical switching control strategy and the switching tube module multiplexing strategy, and the charging system has the advantages of simple structure, low control complexity, low design cost, higher reliability and wide application range.
The above technical solutions in the embodiments of the present application have at least one of the following technical effects:
Through setting up switching tube module and active leakage current suppression circuit, combine symmetrical switch control strategy and switching tube module multiplexing strategy, effectively realize power frequency leakage current suppression and high frequency leakage current suppression, and this charging system simple structure, control complexity is low, and design cost is low, has higher reliability and extensive application scene.
In the three-phase alternating current charging mode, the auxiliary switching tube is connected in parallel to serve as a phase bridge arm to charge the energy storage device, so that the power frequency leakage current suppression and the high-frequency leakage current suppression can be effectively realized in the single-phase charging mode and the three-phase charging mode.
Furthermore, by arranging the first auxiliary switch module and the second auxiliary switch module which are symmetrical, the auxiliary switch tube can be used as a high-frequency inversion module to provide excitation source input for the active leakage current suppression circuit in a single-phase alternating current charging mode, so that the power frequency leakage current suppression is realized, and the first auxiliary switch module and the second auxiliary switch module are connected in parallel to be used as a bridge arm of a phase line to charge the energy storage device in a three-phase alternating current charging mode, so that the multiplexing of the auxiliary switch tube is realized, the circuit structure is simplified, the control complexity and the design cost are effectively reduced, and the method has higher reliability and wide application scene.
Still further, through setting up third low pass filter, fourth wave filter and fourth switch, can utilize the energy memory in the system as the excitation source, need not to set up the excitation source additionally, further simplified circuit structure, effectively reduced control complexity and design cost.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a charging system according to an embodiment of the present application;
Fig. 2 is a second schematic structural diagram of a charging system according to an embodiment of the application.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the present application, fall within the scope of protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The charging system and the vehicle provided by the embodiment of the application are described in detail below through specific embodiments and application scenes thereof with reference to the accompanying drawings.
As shown in fig. 1, the charging system includes a switching transistor module and an active leakage current suppressing circuit 100.
The switching tube module can be arranged in the non-isolated charger.
The non-isolated charger is connected between the power grid 10 and the energy storage device 70 for converting ac to dc.
The energy storage device 70 may include various types of energy storage batteries, among others.
The power grid 10 may include a single-phase input power grid or a three-phase input power grid.
In some embodiments, a switch module 110 may be disposed in each phase line and zero line of the three-phase input power grid to control the on-off of the corresponding branch, so as to implement switching between the single-phase charging mode and the three-phase charging mode.
As shown in fig. 1, in some embodiments, the charging system may further include a switch module 110, and the switch module 110 may be disposed on each phase and zero line between the non-isolated charger and the power grid 10.
It will be appreciated that the charging system may comprise a pile end and a car end, wherein the pile end is provided with electrical energy input by an ac source of the power grid, the car end comprises a non-isolated charger connected between the power grid 10 and the energy storage device 70, and the non-isolated charger converts ac to dc to charge the energy storage device 70.
The charging system may include a plurality of first filters.
The switch tube module is arranged between the two first filters.
The first filter may be an EMI filter.
With continued reference to fig. 1, in some embodiments, the charging system may also include a common mode inductance module 30.
In this embodiment, common mode inductance module 30 may be disposed in a non-isolated charger.
The common mode inductance module 30 is connected between the power grid 10 and the switching tube module, and the common mode inductance module 30 is disposed on a phase line of the charging system.
In some embodiments, where the charging system is in a three-phase alternating current charging mode, common mode inductance module 30 may include a plurality of sub-common mode inductances L1.
In this embodiment, as shown in fig. 2, at least one sub-common-mode inductor L1 is disposed on each phase line.
Taking the first filter as an EMI filter as an example, the plurality of first filters may include a first EMI filter 20 and a second EMI filter 60, and the second EMI filter 60 is used to connect with the energy storage device 70.
The first EMI filter 20 is connected to the second EMI filter 60 via a sub common-mode inductor L1 provided in each phase line and a switching tube module connected to the sub common-mode inductor L1.
In the case where the charging system is in the three-phase ac charging mode, the common mode inductance module 30 can suppress the high-frequency leakage current generated by the charging system.
The switching tube module is connected between the power grid 10 and the energy storage device 70.
In some embodiments, the switching tube module employs a symmetrical switching strategy to suppress high frequency leakage currents generated in the single phase ac charging mode.
The active leakage current suppressing circuit 100 is connected to the ground line PE of the power grid 10 and the switching tube module, respectively.
The active leakage current suppressing circuit 100 is configured to generate a reverse leakage current having a magnitude different from that of a leakage current in a circuit of the charging system by a degree not exceeding a target range and having a phase opposite to that of the target range, and to inject the reverse leakage current into the circuit of the charging system, so that an net leakage current on a ground line approaches 0, thereby achieving leakage current suppression.
The target range is a smaller range, and can be specifically customized based on users.
The degree of difference may be a difference or a ratio, etc.
It will be appreciated that in the event that the degree of difference does not exceed the target range, the magnitude of the reverse leakage current may be approximately considered to be the same or substantially the same as the magnitude of the leakage current in the circuitry of the charging system.
The switching module 110 is used to switch the operation mode of the power grid 10.
Wherein the operation mode includes a single-phase ac charging mode or a three-phase ac charging mode.
In some embodiments, the switch module 110 may also control the operating state of the active leakage current suppression circuit 100.
Wherein the operating state includes active or inactive.
In the case where the charging system is in the single-phase ac charging mode, the active leakage current suppressing circuit 100 operates.
In the case where the charging system is in the three-phase ac charging mode, the active leakage current suppressing circuit 100 does not operate.
In the actual implementation process, when the charging system is in the single-phase ac charging mode, the active leakage current suppression circuit 100 operates to generate a reverse leakage current having a magnitude different from that of the leakage current I leak in the circuit of the charging system, and having a phase opposite to that of the target range, so as to achieve power frequency leakage current suppression.
The switching tube module adopts a symmetrical switching control strategy and is used for realizing the negative jump trend of the positive potential of the direct current bus with the same amplitude when the positive potential of the direct current bus jumps, thereby inhibiting the generated high-frequency leakage current.
In the case where the charging system is in the three-phase ac charging mode, the active leakage current suppressing circuit 100 can be disabled without performing the power frequency leakage current suppression, and the generated high-frequency leakage current can be suppressed by the common mode inductance module 30.
According to the charging system provided by the embodiment of the application, the power frequency leakage current inhibition and the high-frequency leakage current inhibition are effectively realized by arranging the switching tube module and the active leakage current inhibition circuit and combining the symmetrical switching control strategy and the switching tube module multiplexing strategy, and the charging system has the advantages of simple structure, low control complexity, low design cost, higher reliability and wide application scene.
With continued reference to FIG. 1, in some embodiments, the switching tube module includes a main switching tube module 50 and an auxiliary switching tube module 90.
In this embodiment, the main switching tube module 50 is connected between the power grid 10 and the energy storage device 70.
An auxiliary switching tube module 90 is connected between the power grid 10 and the energy storage device 70. The auxiliary switching tube module 90 is used for providing an excitation source for the active leakage current suppression circuit 100.
With continued reference to fig. 1, in some embodiments, the switching tube module may also include a first inductance module 40.
In this embodiment, the first inductor module 40 and the main switching tube module 50 are in turn connected between the power grid 10 and the energy storage device 70.
In some embodiments, the main switching tube module 50 employs a symmetrical switching control strategy for suppressing high frequency leakage current in the charging system in a single phase ac charging mode.
The second inductance module 80 and the auxiliary switching tube module 90 are connected in turn between the power grid 10 and the energy storage device 70.
In some embodiments, the switching tube module may also include a second inductance module 80.
In this embodiment, the second inductance module 80 and the auxiliary switching tube module 90 are connected in turn between the power grid 10 and the energy storage device 70.
The auxiliary switching tube module 90 is used for providing an excitation source for the active leakage current suppressing circuit 100 in the single-phase ac charging mode.
In the actual implementation process, under the condition that the charging system is in a single-phase alternating current charging mode, the main switch tube module 50 adopts a symmetrical switch control strategy so as to ensure that when the positive potential of the direct current bus jumps, the negative potential of the direct current bus can jump in the opposite direction and the same amplitude at the same time, thereby realizing the effect of high-frequency leakage current offset and further inhibiting the leakage current generated in the single-phase alternating current charging.
In the case of the charging system in a three-phase ac charging mode, the main switching tube module 50 and the auxiliary switching tube module 90 are connected to corresponding phase lines, respectively, to charge the energy storage device 70.
According to the charging system provided by the embodiment of the application, through arranging the main switching tube module 50 and the auxiliary switching tube module 90, different functions of each switching tube module can be realized in different charging modes through multiplexing of the switching tube modules, and therefore, the power frequency leakage current suppression and the high frequency leakage current suppression can be effectively realized in single-phase and multi-phase charging modes.
As shown in fig. 2, in some embodiments, the main switching tube module 50 may include a first main switching module and a second main switching module connected in parallel, and the first inductance module 40 includes a second inductance L2 and a third inductance L3.
In this embodiment, the first main switch module constitutes one leg and the second main switch module constitutes the other leg.
The first main switch module comprises a first sub switch S1 and a second sub switch S2 which are connected in series, and a midpoint between the first sub switch S1 and the second sub switch S2 is connected with a first phase line of the charging system through a second inductor L2.
The second main switch module comprises a third sub switch S3 and a fourth sub switch S4 which are connected in series, and a midpoint between the third sub switch S3 and the fourth sub switch S4 is connected with a second phase line of the charging system through a third inductor L3.
In some embodiments, the inductance values of the second inductor L2 and the third inductor L3 are the same to achieve symmetry.
In the single-phase alternating-current charging working mode, the first sub-switch S1 and the fourth sub-switch S4 are synchronously switched, the second sub-switch S2 and the third sub-switch S3 are synchronously switched, and a symmetrical switch control strategy is realized.
The following description will take the first phase line as an a phase line and the second phase line as a B phase line as an example.
In the case where the charging system is in a single-phase ac charging mode, the first main switch module serves as an L-phase leg, and the second main switch module serves as an N-phase leg, to charge the energy storage device 70.
Meanwhile, the first main switch module and the second main switch module are symmetrically switched, so that high-frequency leakage current generated in the working process of the circuit is restrained.
In the case of the charging system being in a three-phase ac charging mode, the first main switch module serves as an a-phase leg and the second main switch module serves as a B-phase leg to charge the energy storage device 70.
With continued reference to fig. 2, in some embodiments, the auxiliary switching tube module 90 may include a first auxiliary switching module and a second auxiliary switching module connected in parallel, and the second inductance module 80 includes a fourth inductance L4 and a fifth inductance L5.
In this embodiment, the first auxiliary switch module constitutes one leg and the second auxiliary switch module constitutes the other leg.
The first auxiliary switch module comprises a fifth sub-switch S5 and a sixth sub-switch S6 which are connected in series, and a midpoint between the fifth sub-switch S5 and the sixth sub-switch S6 is connected with a third phase line of the charging system through a fourth inductor L4.
In some embodiments, a midpoint between the fifth sub-switch S5 and the sixth sub-switch S6 may also be connected to an input of the active leakage current suppression circuit 100 via the fourth inductor L4.
The second auxiliary switch module comprises a seventh sub-switch S7 and an eighth sub-switch S8 which are connected in series, and the midpoint between the seventh sub-switch S7 and the eighth sub-switch S8 is connected with a third phase line of the charging system through a fifth inductor L5.
In some embodiments, a midpoint between the seventh sub-switch S7 and the eighth sub-switch S8 is also connected to an input of the active leakage current suppression circuit 100 via the fifth inductor L5.
In some embodiments, the inductance value of the fourth inductor L4 and the fifth inductor L5 are the same, and the inductance value of the fourth inductor L4 is twice the inductance value of the second inductor L2.
In the case that the charging system is in a single-phase ac charging mode, the first auxiliary switch module and the second auxiliary switch module implement a high-frequency inversion function, and provide an excitation source input for the active leakage current suppression circuit 100, as shown in fig. 2, in an actual implementation process, a controller and a leakage current sampling module electrically connected to the controller may be provided, where the controller controls the leakage current sampling module to sample the leakage current I leak on the ground line.
In the case of a three-phase ac charging mode of the charging system, the first auxiliary switch module and the second auxiliary switch module operate in parallel as a C-phase leg to charge the energy storage device 70.
According to the charging system provided by the embodiment of the application, the first auxiliary switch module and the second auxiliary switch module are arranged, so that the auxiliary switch tube can be used as a high-frequency inversion module to provide excitation source input for the active leakage current suppression circuit 100 in a single-phase alternating current charging mode, the power frequency leakage current suppression is realized, and the first auxiliary switch module and the second auxiliary switch module are connected in parallel to serve as a bridge arm of a phase line to charge the energy storage device 70 in a three-phase alternating current charging mode, so that the multiplexing of the auxiliary switch tube is realized, the circuit structure is simplified, the control complexity and the design cost are effectively reduced, and the charging system has higher reliability and wide application range.
The structure of the active leakage current suppressing circuit 100 will be specifically described below.
With continued reference to fig. 2, in some embodiments, the active leakage current suppression circuit 100 may include a power supply device, a first transformer T1, and a first Y capacitor CY1.
In this embodiment the power supply means is means for providing the excitation.
In some embodiments, the input of the power supply device is connected to two inputs of an auxiliary switching tube module 90 included in the switching tube module to provide an excitation source by the auxiliary switching tube module 90.
The primary side of the first transformer T1 is connected to a power supply device, and the first end of the secondary side of the first transformer T1 is connected to a ground line via a first Y capacitor CY1 to provide a voltage reference.
The second end of the secondary side of the first transformer T1 is connected with the phase line and the zero line of the charging system, and is connected with the switching tube module, so that reverse leakage current with the amplitude difference degree of the leakage current in the circuit of the charging system not exceeding a target range and opposite phase is injected into the circuit of the charging system, and leakage current suppression is realized.
In some embodiments, the injection point of the reverse leakage current may include a neutral point of the capacitor module before the first filter, a neutral point of the capacitor module after the first filter, or a neutral point of the capacitor module before the energy storage device 70, for example, as shown in fig. 2, the capacitor module may be disposed before the energy storage device 70, and the capacitor module includes the second capacitor CY2 and the third capacitor CY3 connected in series, and the injection point of the reverse leakage current is a neutral point between the second capacitor CY2 and the third capacitor CY3, which is not limited by the present application.
The capacitor module is arranged between the phase line and the zero line.
In some embodiments, the capacitive module may include a first sub-capacitance and a second sub-capacitance connected in series.
The first sub-capacitor and the second sub-capacitor are connected in series and then are arranged between the L line and the N line of the power grid 10, and the neutral point of the capacitor module is the potential midpoint between the first sub-capacitor and the second sub-capacitor.
In some embodiments, the power supply device may include a third low pass filter, a fourth filter, and a fourth switch K41.
In this embodiment, the fourth filter may include, but is not limited to, pi-type filters or other types of EMI filters, and the like.
The output end of the fourth filter is connected to the primary side of the first transformer T1, as shown in fig. 2, and the fourth filter may be EMI filtering in the figure.
In some embodiments, the input terminal of the third low-pass filter is connected to the fourth inductor L4 and the fifth inductor L5 included in the auxiliary switching tube module 90, as shown in fig. 2, and the third low-pass filter may be the low-pass filter in the figure.
The third low-pass filter and the fourth filter are connected in series, the fourth switch K41 is connected in parallel with two input ports of the third low-pass filter, and the fourth switch K41 is disposed between two input ports of the auxiliary switching tube module 90 included in the switching tube module.
In the case where the fourth switch K41 is closed, the active leakage current suppressing circuit 100 is short-circuited.
When the fourth switch K41 is turned off, the third low-pass filter is connected to two ends of the energy storage device 70 through the auxiliary switch, and the high-voltage direct current output by the energy storage device 70 is used as an excitation source of the active leakage current suppression circuit 100, so that the active leakage current suppression circuit 100 works to generate reverse leakage current and is injected into the circuit of the charging system through the secondary side of the first transformer T1.
Of course, in other embodiments, the power supply device may also be a low-voltage battery, an ac power of the power grid 10, or an active leakage current suppressing excitation circuit, which is not limited by the present application.
According to the charging system provided by the embodiment of the application, the energy storage device 70 in the system can be used as an excitation source by arranging the third low-pass filter, the fourth filter and the fourth switch, and the additional excitation source is not needed, so that the circuit structure is further simplified, and the control complexity and the design cost are effectively reduced.
In some embodiments, the charging system may further include a plurality of first switches and a plurality of fourth capacitors.
In this embodiment, as shown in fig. 2, the plurality of first switches may include a switch K81, a switch K82, a switch K83, and a switch K84.
With continued reference to fig. 2, the fourth plurality of capacitors may include C1, C2, and C3.
At least one first switch is arranged on the phase line and the zero line of the power grid 10 respectively, and when the first switch is closed, a branch circuit arranged by the first switch is conducted.
The fourth capacitor is arranged between the target phase line and the zero line.
Wherein the target phase line includes at least one of an a phase line, a B phase line, and a C phase line.
One end of the fourth capacitor connected to the zero line is also connected to the second end of the secondary side of the first transformer T1 of the active leakage current suppressing circuit 100.
One end of the fourth capacitor connected with the zero line is also connected with any one of the phase lines.
By controlling the open-close state of the first switch, switching between the single-phase charging and the three-phase charging modes can be achieved.
In some embodiments, the first switch may include, but is not limited to, a relay or the like.
For example, with continued reference to fig. 2, with switch K81 and switch K84 closed, the charging system operates in a single phase ac input mode.
In the single-phase ac input mode, the fourth switch K41 is controlled to be turned off, the third low-pass filter is connected to two ends of the energy storage device 70 through the auxiliary switch, and the high-voltage dc output by the energy storage device 70 is used as an excitation source of the active leakage current suppression circuit 100, so that the active leakage current suppression circuit 100 works.
With switches K81, K82 and K83 closed, the charging system operates in a three-phase ac input mode.
In the three-phase ac input mode, the fourth switch K41 is controlled to be turned on, so that the active leakage current suppression circuit 100 may be disabled, and in this case, the first auxiliary switch module and the second auxiliary switch module operate in parallel as a C-phase bridge arm to charge the energy storage device 70.
According to the charging system provided by the embodiment of the application, the compatibility of single-phase input and three-phase input can be realized by arranging the plurality of switches, the suppression of power frequency leakage current and high frequency leakage current can be realized in any charging mode, and the application scene and range of the charging system are further improved.
The embodiment of the application also provides an energy storage system.
The energy storage system comprises an energy storage device and a charging system as described in any of the embodiments above.
The charging system is used for being connected between the power grid and the energy storage device and used for charging the energy storage device.
In the actual implementation process, in the single-phase alternating-current charging mode, the auxiliary switching tube module 90 is multiplexed to provide an excitation source for the active leakage current suppression circuit to suppress the power frequency leakage current, and the main switching tube module 50 adopts a symmetrical switching strategy to suppress the high frequency leakage current.
In the three-phase ac charging mode, the auxiliary switching tube module 90 is connected in parallel as a certain phase bridge arm to charge the energy storage device.
According to the energy storage system provided by the embodiment of the application, the switching tube module and the active leakage current suppression circuit are arranged, the auxiliary switching tube module is multiplexed to provide an excitation source for the active leakage current suppression circuit in a single-phase alternating current charging mode, the main switching tube adopts a symmetrical switching strategy to effectively realize power frequency leakage current suppression and high-frequency leakage current suppression, and the auxiliary switching tube is connected in parallel to serve as a certain phase bridge arm to charge an energy storage device in a three-phase alternating current charging mode.
The embodiment of the application also provides a vehicle.
The vehicle includes an energy storage system as in any of the embodiments above.
In this embodiment, the energy storage system is provided to the vehicle body for powering the vehicle.
In the actual implementation process, in the single-phase alternating-current charging mode, the auxiliary switching tube module 90 is multiplexed to provide an excitation source for the active leakage current suppression circuit to suppress the power frequency leakage current, and the main switching tube module 50 adopts a symmetrical switching strategy to suppress the high frequency leakage current.
In the three-phase ac charging mode, the auxiliary switching tube module 90 is connected in parallel as a certain phase bridge arm to charge the energy storage device.
According to the vehicle provided by the embodiment of the application, the power frequency leakage current inhibition and the high frequency leakage current inhibition are effectively realized by arranging the switching tube module and the active leakage current inhibition circuit and combining the symmetrical switching control strategy and the switching tube module multiplexing strategy, and the charging system has the advantages of simple structure, low control complexity, low design cost, higher reliability and wide application range.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.
Claims (15)
1. A charging system, comprising:
the switching tube module is connected between the power grid and the energy storage device;
The active leakage current suppression circuit is respectively connected with the ground wire of the power grid and the switch tube module and is used for generating reverse leakage current which is not more than a target range in difference degree of the amplitude of the leakage current in the charging system and opposite in phase;
the switching tube module comprises a main switching tube module and an auxiliary switching tube module, and the main switching tube module and the auxiliary switching tube module are connected in parallel;
The main switch tube module is connected between the power grid and the energy storage device;
The auxiliary switching tube module is connected between the power grid and the energy storage device and is used for providing an excitation source for the active leakage current suppression circuit.
2. The charging system of claim 1, wherein the switching tube module further comprises:
The first inductance module and the main switch tube module are sequentially connected between the power grid and the energy storage device.
3. The charging system of claim 2, wherein the main switching tube module comprises a first main switching module and a second main switching module connected in parallel, the first inductance module comprises a second inductance and a third inductance,
The first main switch module comprises a first sub switch and a second sub switch which are connected in series, and the midpoint between the first sub switch and the second sub switch is connected with a first phase line of the charging system through the second inductor;
The second main switch module comprises a third sub-switch and a fourth sub-switch which are connected in series, and a midpoint between the third sub-switch and the fourth sub-switch is connected with a second phase line of the charging system through the third inductor.
4. A charging system according to claim 3, wherein the inductance of the second inductor and the third inductor are the same.
5. The charging system of claim 1, wherein the main switching tube module employs a symmetrical switching control strategy for suppressing high frequency leakage currents in the charging system.
6. The charging system of claim 3, wherein the switching tube module further comprises:
The second inductance module and the auxiliary switching tube module are sequentially connected between the power grid and the energy storage device, the second inductance module is connected with the auxiliary switching tube module, and the second inductance module is connected with the active leakage current suppression circuit.
7. The charging system of claim 6, wherein the auxiliary switching tube module comprises a first auxiliary switching module and a second auxiliary switching module connected in parallel, the second inductance module comprising a fourth inductance and a fifth inductance, wherein,
The first auxiliary switch module comprises a fifth sub switch and a sixth sub switch which are connected in series, and the midpoint between the fifth sub switch and the sixth sub switch is connected with a third phase line of the charging system and the input end of the active leakage current suppression circuit through the fourth inductor;
the second auxiliary switch module comprises a seventh sub-switch and an eighth sub-switch which are connected in series, and a midpoint between the seventh sub-switch and the eighth sub-switch is connected with the third phase line and the input end of the active leakage current suppression circuit through the fifth inductor.
8. The charging system of claim 7, wherein the inductance of the fourth inductor and the inductance of the fifth inductor are the same, and the inductance of the fourth inductor is twice the inductance of the second inductor.
9. The charging system according to any one of claims 1 to 8, wherein the active leakage current suppressing circuit includes:
The input end of the power supply device is connected with two input ends of an auxiliary switching tube module included in the switching tube module;
The primary side of the first transformer is connected with the power supply device;
and the first end of the secondary side of the first transformer is connected with the ground wire through the first Y capacitor, and the second end of the secondary side is connected with the phase line and the zero line of the charging system.
10. The charging system according to claim 9, wherein the power supply device includes:
The output end of the fourth filter is connected with the primary side of the first transformer, and the input end of the third low-pass filter is connected with a fourth inductor and a fifth inductor which are included in the auxiliary switching tube module;
And the fourth switch is connected with the two input ends of the third low-pass filter in parallel, and the fourth switch is arranged between the two input ends of the auxiliary switching tube module.
11. The charging system according to any one of claims 1-8, further comprising:
The charging system comprises a plurality of first switches, wherein the first switches are respectively arranged on a plurality of phase lines and zero lines of the charging system;
The fourth capacitors are arranged between the target phase line and the zero line, and one end of each fourth capacitor connected with the zero line is also connected with the active leakage current suppression circuit.
12. The charging system according to any one of claims 1-8, further comprising:
And the common mode inductance module is connected between the power grid and the switching tube module and is arranged on a phase line of the charging system.
13. The charging system of any of claims 1-8, wherein the switching tube module employs a symmetrical switching control strategy.
14. An energy storage system, comprising:
An energy storage device;
A charging system according to any one of claims 1 to 13, said charging system being connected between an electrical grid and said energy storage device.
15. A vehicle, characterized by comprising:
the energy storage system of claim 14.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201839195U (en) * | 2010-11-05 | 2011-05-18 | 湖南丰日电源电气股份有限公司 | AC-DC dual-purpose high-voltage DC power supply system |
| CN103782472A (en) * | 2011-06-22 | 2014-05-07 | 雷诺股份公司 | System and method for compensating a battery charger installed in a vehicle |
| EP3876406A1 (en) * | 2020-03-04 | 2021-09-08 | EPA GmbH | Method and device for compensating for leakage current in an emi-filter |
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| JP5840514B2 (en) * | 2012-01-30 | 2016-01-06 | 株式会社東芝 | Leakage current suppression circuit |
| DE102016209855A1 (en) * | 2016-06-06 | 2017-12-07 | Robert Bosch Gmbh | Device and method for a system with a pulse inverter |
| CN107579675B (en) * | 2017-10-23 | 2019-08-23 | 燕山大学 | A six-switch current-type photovoltaic inverter topology and method that can suppress leakage current |
| CN216981567U (en) * | 2022-01-27 | 2022-07-15 | 比亚迪股份有限公司 | Electric vehicle and charge-discharge control system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201839195U (en) * | 2010-11-05 | 2011-05-18 | 湖南丰日电源电气股份有限公司 | AC-DC dual-purpose high-voltage DC power supply system |
| CN103782472A (en) * | 2011-06-22 | 2014-05-07 | 雷诺股份公司 | System and method for compensating a battery charger installed in a vehicle |
| EP3876406A1 (en) * | 2020-03-04 | 2021-09-08 | EPA GmbH | Method and device for compensating for leakage current in an emi-filter |
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