V2x charging / discharging module and distributed power supply system including same

Abstract

The present invention relates to a V2X charging / discharging module for detecting an abnormality and cutting off power, and a distributed power supply system including same. The V2X charging / discharging module includes: an abnormality detection unit connected to a bidirectional charger / discharger over a network and detecting whether a power system is abnormal, whether a charger is abnormal, and whether an electric vehicle is abnormal; and an emergency cut-off unit connected to the bidirectional charger / discharger over the network and turning off a plurality of switches when the abnormality detection unit detects an abnormality in any one of the power system, the bidirectional charger / discharger, or the electric vehicle.

Description

V2X charge / discharge module and distributed power system including the same

[0001] The present invention relates to a V2X charge / discharge module and a distributed power system including the same, and more specifically, to a V2X charge / discharge module that detects an abnormality and cuts off power, and a distributed power system including the same.

[0002] Hybrid and electric vehicles are known to the public as eco-friendly automobiles. Generally, a hybrid vehicle can be defined as a vehicle with two or more power sources, such as an engine and a motor, while an electric vehicle can be defined as a vehicle that uses a pure battery. Hybrid vehicles can self-charge the battery by rotating a generator while the vehicle is in motion and convert it into driving energy. In particular, hybrid vehicles enhance energy efficiency by utilizing a regenerative braking system to convert the kinetic energy of the reverse-rotating electric motor during deceleration into electrical energy, store it in the battery, and allow the stored energy to be used while driving.

[0003] Meanwhile, electric vehicles are designed to be used after charging, much like electronic devices. However, without the infrastructure to charge the vehicle, using an electric vehicle can be very difficult. To overcome this, plug-in hybrid electric vehicles (PHEVs) have been proposed. Plug-in hybrid electric vehicles (PHEVs) are vehicles that have raised energy utilization efficiency to an intermediate level between hybrid and electric vehicles, and they differ from hybrid vehicles in that the driver charges (plugs in) the car just like an electric vehicle.

[0004] Infrastructure capable of charging electric and plug-in hybrid vehicles is required for their use. Furthermore, interoperability of infrastructure is a critical factor for e-mobility. Charging infrastructure must be capable of charging multiple vehicle types; accordingly, charging methods and technologies are being standardized through standardization organizations.

[0005] A Smart Grid refers to a power grid that integrates Information & Communication Technology (ICT) into the existing power grid to optimize energy efficiency by enabling suppliers and consumers to exchange real-time power information in both directions. Here, bidirectional power supply refers to a supply system where power can be exchanged bidirectionally between the power grid and consumers, rather than the conventional unidirectional supply structure of generation, transmission, distribution, and sales. For example, in a system where power is supplied unidirectionally, consumers only consume power while power generators generate and supply only the amount required. However, in a Smart Grid system, consumers can sell surplus electrical energy to the power grid operator by utilizing devices such as electric vehicle Energy Storage Systems (ESS) that are charged on their end.

[0006] The present invention provides a V2X charge / discharge module that detects abnormalities and cuts off power, and a distributed power system including the same.

[0007] The scope of the present invention is not limited by this.

[0008] One aspect of the present invention provides a V2X charging / discharging module that controls a bidirectional charging / discharging unit having a plurality of switches connecting the power system and the electric vehicle, the charging / discharging unit electrically connected to a power system to charge an electric vehicle to the power system or transmit electrical energy of the electric vehicle to the power system, and the charging / discharging unit having a plurality of switches connecting the power system and the electric vehicle, wherein the module is network-connected to the bidirectional charging / discharging unit and detects whether there is an abnormality in the power system, whether there is an abnormality in the charger, and whether there is an abnormality in the electric vehicle; and an emergency cutoff unit that is network-connected to the bidirectional charging / discharging unit and turns off the plurality of switches when the abnormality detection unit detects an abnormality in any one of the power system, the bidirectional charging / discharging unit, and the electric vehicle.

[0009] The above abnormality detection unit can detect whether there is an abnormality in the power system by monitoring the input current of the bidirectional charger / discharger during charging / discharging, or detect whether there is an abnormality in the power system by receiving an abnormality signal from the power system.

[0010] The above abnormality detection unit can detect whether there is an abnormality in the bidirectional charger / discharger by monitoring the output current of the bidirectional charger / discharger during charging and discharging of the electric vehicle.

[0011] The above abnormality detection unit can detect whether there is an abnormality in the electric vehicle by receiving the abnormality from the electric vehicle during charging and discharging, or detect whether there is an abnormality in the electric vehicle by monitoring the abnormality of the current transmitted and received with the electric vehicle.

[0012] Another aspect of the present invention provides a bidirectional charging / discharging unit electrically connected to a power system to charge an electric vehicle to the power system or transmit electrical energy of the electric vehicle to the power system, and having a plurality of switches connecting the power system and the electric vehicle; and an emergency cutoff unit connected to the bidirectional charging / discharging unit via a network, detecting whether there is an abnormality in the power system, whether there is an abnormality in the charger, and whether there is an abnormality in the electric vehicle, and if an abnormality is detected in any one of the power system, the charger, and the electric vehicle, the plurality of switches are turned off.

[0013] Other aspects, features, and advantages other than those described above will become clear from the following specific details, claims, and drawings for implementing the invention.

[0014] A V2X charging / discharging module that detects abnormalities and cuts off power according to one embodiment of the present invention and a distributed power system including the same can improve stability by cutting off power depending on whether there are abnormalities in the power grid, bidirectional charging / discharging device, or electric vehicle.

[0015] Of course, the scope of the present invention is not limited by these effects.

[0016] FIG. 1 is a block diagram schematically illustrating a V2X charge / discharge module according to one embodiment of the present invention and a distributed power system including the same.

[0017] FIG. 2 is a block diagram schematically illustrating a V2X charge / discharge module according to one embodiment of the present invention and a distributed power system including the same.

[0018] Hereinafter, various embodiments of the present disclosure are described in conjunction with the accompanying drawings. As various embodiments of the present disclosure may be subject to various modifications and may have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the various embodiments of the present disclosure to specific forms, and it should be understood that they include all modifications and / or equivalents and substitutions that fall within the spirit and scope of the various embodiments of the present disclosure. In relation to the description of the drawings, similar reference numerals have been used for similar components.

[0019] Expressions such as “comprising” or “may compose,” which may be used in various embodiments of the present disclosure, indicate the presence of the disclosed corresponding function, operation, or component, and do not limit one or more additional functions, operations, or components. Furthermore, in various embodiments of the present disclosure, terms such as “comprising” or “having” are intended to specify the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0020] In various embodiments of the present disclosure, expressions such as “or” include any and all combinations of the words listed together. For example, “A or B” may include A, may include B, or may include both A and B.

[0021] Expressions such as "first," "second," "first," or "second" used in various embodiments of the present disclosure may modify various components of the various embodiments, but do not limit such components. For example, such expressions do not limit the order and / or importance of such components. Such expressions may be used to distinguish one component from another. For example, the first user device and the second user device are both user devices and represent different user devices. For example, without departing from the scope of the various embodiments of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component.

[0022] When it is stated that a component is "connected" or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that a new component may exist between the component and the other component. On the other hand, when it is stated that a component is "directly connected" or "directly connected" to another component, it should be understood that no new component exists between the component and the other component.

[0023] The terms used in the various embodiments of this disclosure are used merely to describe specific embodiments and are not intended to limit the various embodiments of this disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0024] In addition, terms such as "...part," "...unit," and "...module" refer to a unit that processes at least one function or operation, and this can be classified as hardware, software, or a combination of both.

[0025] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the various embodiments of this disclosure pertain.

[0026] Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the various embodiments of the present disclosure.

[0027]

[0028] FIGS. 1 and 2 are block diagrams schematically illustrating a V2X charge / discharge module and a distributed power system including the same in an embodiment of the present invention. The distributed power system according to the present embodiment includes a bidirectional charge / discharger and a V2X charge / discharge module. In some cases, the distributed power system may include a power grid and an electric vehicle.

[0029] The power system (G) is provided by a power supply company. It includes power plants, substations, and transmission lines. It may be a smart grid. The power system may supply power to demand centers, but it may also receive surplus power from demand centers. That is, as illustrated in the drawing, surplus power from electric vehicles can be supplied to the grid.

[0030] For example, the power system may include power plants, renewable energy sources, ESS, etc. More specifically, the power system may be a power plant such as a hydroelectric, nuclear, or thermal power plant, and may be electrically connected to a bidirectional charging and discharging device through a transmission tower.

[0031] Alternatively, the power system may be a renewable energy power plant, such as a solar power plant or a wind power plant.

[0032] Alternatively, the power system may be an energy storage system (ESS) including batteries.

[0033] Such power systems can be electrically connected directly to bidirectional charging and discharging devices, or electrically connected through transmission towers, etc.

[0034] In this case, the power grid is connected to the V2X charging / discharging module via a network, allowing the power grid's status to be transmitted to the V2X charging / discharging module. For example, a solar power plant can transmit information such as whether it is operating normally or generating power to the V2X charging / discharging module.

[0035] An electric vehicle is a means of transportation that uses battery charge power as a driving power source. It charges its internal battery by receiving power from the power grid. Alternatively, it can supply the power charged in its internal battery back to the power grid.

[0036] For example, electric vehicles can be battery electric vehicles (BEVs), hybrid electric vehicles (xHEVs), hydrogen fuel cell vehicles (FCEVs), etc.

[0037] The bidirectional charger / discharger charges or discharges the electric vehicle's battery using an inlet connected to the electric vehicle.

[0038] In this embodiment, the charging mode and the discharging mode are defined based on the electric vehicle. The charging mode is defined as when the electric vehicle receives power from the power grid to charge the battery, and the discharging mode is defined as when the electric vehicle discharges the battery to supply power to the power grid.

[0039] This embodiment describes an infrastructure for a V2G environment in particular among V2X environments in that an electric vehicle and a power grid are interconnected, but the present invention is not limited to these expressions.

[0040] As illustrated in Figures 1 and 2, the power system, bidirectional charger / discharger, and electric vehicle generally correspond to elements that also exist in existing unidirectional electric vehicle charging infrastructure. The power system and electric vehicle may be identical to those in existing unidirectional charging infrastructure, and only the bidirectional charger / discharger may have its terminology changed from "charger" in existing unidirectional charging infrastructure to "charger / discharger" to suit its role.

[0041] Of course, unlike conventional chargers, bidirectional chargers must operate in both charging and discharging modes, so some elements for discharging may be added; however, looking at the infrastructure as a whole, there are no major changes before or after introduction. In other words, the general approach of building a bidirectional charging and discharging infrastructure by utilizing most of the existing charging infrastructure as is is maintained.

[0042] A bidirectional charging and discharging device may include an inverter equipped with first to third coils L1 to L3, each connected to a phase of the input terminal of a three-phase AC power source, and first to sixth switching elements S1 to S6 connected in parallel to the output terminals of the first to third coils L1 to L3, and a DC link capacitor Cdc1 that links the output voltage of the inverter to output a DC link voltage. Here, the plurality of switching elements may be IGBTs (Insulated Gate Bipolar Transistors).

[0043] In one embodiment, the inverter, which is equipped with first to third coils L1 to L3 connected to each phase of the input terminal of a three-phase AC power source and first to sixth switching elements S1 to S6 connected in parallel to the output terminals of the first to third coils L1 to L3, and the DC link capacitor Cdc1, which links the output voltage of the inverter to output a DC link voltage, is a configuration already applied in power supply devices, and although the configuration and connection relationships in this specification are not specifically stated, they should be understood by those skilled in the art.

[0044] Additionally, the bidirectional charger / discharger further includes first to third resistors (R1 to R3) at the input terminal connected to the power grid. As illustrated, the first to third resistors (R1 to R3) are each connected in series with the first to third coils L1 to L3.

[0045] Additionally, the bidirectional charging and discharging device may include a plurality of switches (G1 to G6) for turning On / Off each switching element (S1 to S6). More specifically, the bidirectional charging and discharging device includes a first switch (G1) for turning On / Off a first switching element (S1), a second switch (G2) for turning On / Off a second switching element (S2), a third switch (G3) for turning On / Off a third switching element (S3), a fourth switch (G4) for turning On / Off a fourth switching element (S4), a fifth switch (G5) for turning On / Off a fifth switching element (S5), and a sixth switch (G6) for turning On / Off a sixth switching element (S6).

[0046] The V2X charging / discharging module is network-connected to the bidirectional charger / discharger and can turn multiple switches On / Off by determining whether there are abnormalities in the power system, the bidirectional charger / discharger, or the electric vehicle. More precisely, the V2X charging / discharging module can transmit commands to turn multiple switches On / Off. The multiple switches can be controlled according to the commands.

[0047] The V2X charge / discharge module can be coupled to or attached to a bidirectional charge / discharger. More specifically, the V2X charge / discharge module can be coupled to or attached to an existing bidirectional charge / discharger. In particular, the V2X charge / discharge module can be installed inside the housing of the bidirectional charge / discharger.

[0048] These V2X charge / discharge modules include an anomaly detection unit and an emergency cutoff unit.

[0049] The abnormality detection unit can detect whether there is an abnormality in the power system, whether there is an abnormality in the charge / discharger, and whether there is an abnormality in the electric vehicle.

[0050] The emergency cutoff unit can turn off the plurality of switches when the abnormality detection unit detects an abnormality in any one of the power system, the bidirectional charger / discharger, and the electric vehicle.

[0051] More specifically, the anomaly detection unit can detect whether there is an anomaly in the power system or the electric vehicle by monitoring the current transmitted to the bidirectional charger / discharger.

[0052] More specifically, in charging mode, the anomaly detection unit monitors the current transmitted from the power system to the bidirectional charger / discharger. At this time, the anomaly detection unit can determine that there is an anomaly in the power system if the intensity of the current transmitted from the power system deviates from a predetermined range from the reference current. For example, if the power received by the bidirectional charger from the power system is 380V and 85A, the anomaly detection unit can determine that there is an anomaly in the power system if it is less than 75A or more than 95A.

[0053] In discharge mode, the fault detection unit can transmit and distribute power from the electric vehicle to the power grid. At this time, the fault detection unit can determine that there is a fault in the electric vehicle if the current intensity transmitted from the electric vehicle deviates from a predetermined range from the reference current. For example, if the power received by the bidirectional charger from the electric vehicle is 48V and 16A, the fault detection unit can determine that there is a fault in the power grid if it is less than 11A or more than 21A.

[0054] Meanwhile, the abnormality detection unit monitors the output current of the bidirectional charger and discharger to determine whether there is an abnormality in the bidirectional charger. For example, in charging mode, if the amperage of the output current transmitted by the bidirectional charger to the electric vehicle deviates from a predetermined range from the reference amperage, it can be determined that there is an abnormality in the bidirectional charger. Alternatively, in discharging mode, if the amperage of the output current transmitted by the electric vehicle to the bidirectional charger deviates from a predetermined range from the reference amperage, it can be determined that there is an abnormality in the electric vehicle.

[0055]

[0056] Meanwhile, the anomaly detection unit can communicate with the power system or the electric vehicle via a network. For example, the anomaly detection unit can communicate with the electric vehicle and the power system using PLC (Power Line Communication) communication. Of course, this is not limited to this, and the anomaly detection unit can use various methods such as PWM (Pulse Width Modulation), CAN (Controller Area Network), MOST (Media Oriented Systems Transport) communication, and LIN (Local Interconnect Network) communication.

[0057] Therefore, when the anomaly detection unit receives an anomaly signal from the power system, it can determine that there is an anomaly in the power system. Alternatively, when the anomaly detection unit receives an anomaly signal from the electric vehicle, it can determine that there is an anomaly in the electric vehicle. Additionally, the anomaly detection unit communicates with a bidirectional charger / discharger, and when it receives an anomaly signal from the bidirectional charger / discharger, it can determine that there is an anomaly in the bidirectional charger / discharger.

[0058] The emergency cutoff unit can turn off multiple switches when the abnormality detection unit detects an abnormality in any one of the power system, the bidirectional charger / discharger, or the electric vehicle. More specifically, the emergency cutoff unit may be electrically connected to or communicate with the first to sixth switches (G1 to G6) of the bidirectional charger / discharger via a network. Therefore, the emergency cutoff unit can turn off all of the first to sixth switches (G1 to G6) when an abnormality occurs.

[0059] This can prevent fires caused by abnormalities and device failures.

[0060]

[0061] As such, the module-unit solar panel fault diagnosis and type classification system according to the present embodiment can determine the fault type more accurately by utilizing short-circuit current, open-circuit voltage, maximum voltage, maximum current, voltage gradient, and current gradient. Furthermore, the rapid and accurate determination of the fault type enables faster and more accurate maintenance of the solar panel.

[0062]

[0063] As such, the present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A V2X charging / discharging module that controls a bidirectional charging / discharging device having a plurality of switches that are electrically connected to a power grid to charge an electric vehicle or transmit electrical energy of an electric vehicle to the power grid, and turn the connection between the power grid and the electric vehicle on / off. An abnormality detection unit that detects whether there is an abnormality in the power system, whether there is an abnormality in the charger, and whether there is an abnormality in the electric vehicle; An emergency cutoff unit that turns off the plurality of switches when the above abnormality detection unit detects an abnormality in any one of the power system, the bidirectional charger / discharger, and the electric vehicle; A V2X charge / discharge module including 2. In Paragraph 1, The above abnormality detection unit is a V2X charge / discharge module that detects whether there is an abnormality in the power system or the electric vehicle by monitoring the current transmitted to the bidirectional charge / discharger.

3. In Paragraph 1, The above abnormality detection unit is a V2X charge / discharge module that detects whether there is an abnormality in the bidirectional charge / discharger by monitoring the output current of the bidirectional charge / discharger during the charging of the electric vehicle.

4. In Paragraph 1, The above abnormality detection unit is a V2X charge / discharge module that receives whether there is an abnormality from the power system or the electric vehicle and detects whether there is an abnormality in the power system or the electric vehicle.

5. A bidirectional charge / discharger electrically connected to a power grid to charge an electric vehicle to the power grid or transmit electrical energy of an electric vehicle to the power grid, and having a plurality of switches connecting the power grid and the electric vehicle; and An emergency cutoff unit connected to the above-mentioned bidirectional charging and discharging device via a network, detects whether there is an abnormality in the power system, whether there is an abnormality in the charger, and whether there is an abnormality in the electric vehicle, and turns off the plurality of switches when an abnormality is detected in any one of the power system, the charger, and the electric vehicle; A distributed power system including a V2X charge / discharge module.

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