CN116031921A - Time-sharing household optical storage, charging and discharging integrated system - Google Patents
Time-sharing household optical storage, charging and discharging integrated system Download PDFInfo
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- CN116031921A CN116031921A CN202310142923.XA CN202310142923A CN116031921A CN 116031921 A CN116031921 A CN 116031921A CN 202310142923 A CN202310142923 A CN 202310142923A CN 116031921 A CN116031921 A CN 116031921A
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Abstract
The invention discloses a light storage, charge and discharge integrated system for a time sharing user, which generates power when the sun illumination is sufficient and can rapidly charge and discharge an electric vehicle when the system does not generate power. The household light storing, charging and discharging integrated system comprises: the system comprises a photovoltaic array, a bidirectional direct current-direct current conversion device, an electric power switching device, an energy storage battery system, a direct current bus, a bidirectional alternating current-direct current conversion device, an EMS energy management system, a cloud management platform and a terminal APP. The EMS energy management system is communicated with other modules of the household optical storage charge-discharge integrated system and the battery management system of the battery BMS of the electric vehicle, and is used for carrying out soft switching on the flow direction of electric energy by controlling the bidirectional direct current-direct current conversion device and the bidirectional alternating current-direct current conversion device and carrying out hard switching on the flow direction of the electric energy by controlling the electric power switching device. The invention can rapidly charge and discharge the battery of the electric vehicle without adopting a traditional alternating current-direct current conversion device, thereby improving the utilization rate of the power electronic equipment of the optical storage system and the overall economy of the system.
Description
Technical Field
The invention relates to the field of electric automobile charging, in particular to a household light storage, charging and discharging integrated system.
Background
In recent years, with the reduction of the cost of photovoltaic modules and electrochemical energy storage systems, consumer photovoltaic energy storage systems have become increasingly accepted. In some countries, higher electric charges and government outbound subsidized incentive policies have further facilitated the development and popularity of optical storage systems. Meanwhile, electric vehicles are gradually replacing traditional fuel vehicles. However, charging of private electric vehicles basically employs a low-power ac charging stake, which is slow. If quick charging is required, additional purchase of dc charging piles is required and is often limited by the consumer's meter capacity.
On the other hand, the existing consumer light storage systems themselves have power electronics with electrical energy conversion that are not utilized efficiently. For example, a photovoltaic inverter is generally designed as unidirectional power electronic equipment in which electric energy flows from a photovoltaic module to a direct current bus, and works only when sunlight exists in the daytime, and is idle at night, so that resource waste is caused.
In addition, with the development of technology in recent years, V2G (vehicle to grid) mode is also of primary commercial value. Some electric vehicle battery BMS battery management systems start supporting the V2G discharge function. It is anticipated that a family having an electric vehicle will have a demand for V2G mode in the future.
Disclosure of Invention
In view of the above, the invention provides an integrated system for time-sharing household optical storage and charge and discharge, which maximizes the use of the power electronic equipment of the household optical storage system, can rapidly charge and discharge the battery of the electric vehicle, plays the roles of the direct current charging pile and the V2G, expands the functions of the scheme of the existing household optical storage system, and improves the utilization rate and the economical efficiency of the equipment of the existing household optical storage system.
The invention relates to a time-sharing household light storage, charging and discharging integrated system, which generates electricity when the sun illumination is sufficient, and can rapidly charge and discharge an electric vehicle when the system does not generate electricity, and the system comprises:
the system comprises a photovoltaic array, a bidirectional direct current-direct current conversion device, an electric power switching device, an energy storage battery system, a direct current bus, a bidirectional alternating current-direct current conversion device, an EMS energy management system, a cloud management platform and a terminal APP. The power switching device is connected with the bidirectional direct current-direct current conversion device and an electric vehicle battery (through a charging gun); the bidirectional direct current-direct current conversion device is connected with the power switching device, the photovoltaic array and the direct current bus; the energy storage battery system is directly connected with the direct current bus; the bidirectional alternating current-direct current conversion device is connected with a direct current bus, an alternating current power grid and an alternating current load, and the alternating current side can be a single-phase or three-phase system; the EMS energy management system is communicated with other modules of the household optical storage charge-discharge integrated system and the battery management system of the battery BMS of the electric vehicle, and is used for carrying out soft switching on the flow direction of electric energy by controlling the bidirectional direct current-direct current conversion device and the bidirectional alternating current-direct current conversion device and carrying out hard switching on the flow direction of the electric energy by controlling the electric power switching device.
When photovoltaic power is generated, electrical energy flows from the photovoltaic array to the bi-directional dc-dc conversion device. According to the arrangement and capacity of the photovoltaic array, the photovoltaic array can be connected into a single-path or multi-path MPPT port of the bidirectional direct current-direct current conversion device through a single path or multiple paths, so that the maximum power tracking of photovoltaic power generation is realized. At this time, the power switching device cuts off the connection between the electric vehicle battery and the bidirectional dc-dc converter.
When the photovoltaic does not generate electricity, the photovoltaic array is isolated from the bidirectional direct current-direct current conversion device by the photovoltaic array with the reverse-preventing element, and the MPPT function of the bidirectional direct current-direct current conversion device is controlled by the EMS to be disabled. Under the condition, when the electric vehicle battery has charge and discharge requirements, the electric power switching device is communicated with the electric vehicle battery and the bidirectional direct current-direct current conversion device.
When the photovoltaic does not generate electricity, the system can charge the battery of the electric automobile according to the control instruction of the EMS system. Electric energy from the energy storage battery or the alternating current power grid flows to the battery of the electric automobile through the bidirectional alternating current-direct current conversion device or simultaneously from the energy storage battery or the alternating current power grid through the direct current bus, the bidirectional direct current-direct current conversion device and the electric power switching device.
When the photovoltaic does not generate electricity, the electric automobile battery can also discharge to the system according to the control instruction of the EMS system. The electric energy from the battery of the electric automobile flows to the energy storage battery through the electric power switching device, the bidirectional direct current-direct current conversion device and the direct current bus, or continuously flows to the alternating current power grid or the alternating current load from the direct current bus through the bidirectional alternating current-direct current conversion device, or flows to the three at the same time. This mode requires the electric vehicle battery BMS system to support a discharging protocol.
The power switching device of the invention may be constituted by an electrical switch, a contactor or a solid state electronic switch.
The optical storage, charge and discharge integrated system for the time sharing users can work in various operation modes such as photovoltaic power generation, electric vehicle charge and discharge, energy storage charge and discharge and the like, and the setting of the optical storage, charge and discharge integrated system can be completed by a human-computer interaction terminal of a local EMS energy management system HMI and APP of mobile terminal equipment (mobile phone, tablet personal computer and the like). The EMS energy management system and the cloud server interact data and control signals through a communication protocol, and the EMS energy management system is locally configured with a 4G or 5G module and a local wired or wireless router. The mobile terminal device can set the working mode of the optical storage, charging and discharging integrated system and monitor the running state of the optical storage, charging and discharging integrated system in situ through a wired or wireless network or remotely through a 4G or 5G network.
The beneficial effects of the invention are as follows: the power electronic energy conversion equipment of the light storage system for the user is maximized, direct-current charging and discharging can be carried out on the electric vehicle without additionally purchasing direct-current charging equipment, and the functions of the direct-current charging pile and the V2G are fused into the light storage system for the user.
Drawings
FIG. 1 is a general diagram of the topology of the system of the present invention;
FIG. 2 is a schematic diagram of one mode of operation of the present invention;
fig. 3 is a schematic view of another mode of operation of the present invention.
Description of the embodiments
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings (fig. 1-3), so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the scope of the present invention is more clearly and clearly defined.
In order to maximize the demand of the power electronic energy conversion equipment using the light storage system for users, the invention provides a light storage, charging and discharging integrated system for time-sharing users, so as to overcome the defects that the utilization rate of the power electronic energy conversion equipment using the light storage system for users is low, and an electric automobile needs to be additionally purchased with an alternating current-direct current conversion device for quick charging, and simultaneously meet the increasing demand of potential V2G.
Referring to fig. 1, an embodiment of the present invention includes: the system comprises a photovoltaic array, a bidirectional direct current-direct current conversion device, an electric power switching device, an energy storage battery system, a direct current bus, a bidirectional alternating current-direct current conversion device, an EMS energy management system, a cloud management platform and a terminal APP. Typical bi-directional dc-dc converter topologies include, but are not limited to, buck circuits, boost circuits, buck-Boost circuits, and the like. Typical bi-directional ac-dc conversion device topologies include, but are not limited to, H-bridge circuits or HERIC circuits or NPC circuits, etc. A typical control mode for these switching devices is PWM control of the switching device duty cycle. Typical circuit switching devices consist of switches, contactors, or solid state electronic switches. For convenience, fig. 2 and 3 illustrate a switch. The circuit switching device is controlled by an EMS energy management system according to a preset value or a mode instruction input by a field HMI terminal or a mobile terminal manually.
The bidirectional DC-DC conversion device is connected with the electric vehicle battery (through the charging gun) through the power switching device. The bidirectional direct current-direct current conversion device is connected with the power switching device, the photovoltaic array and the direct current bus. The energy storage battery system is directly connected with the direct current bus, and is commonly used in medium voltage battery systems adopting small-capacity cells. The bidirectional AC-DC conversion device is connected with the DC bus, the AC power grid and the AC load.
The EMS energy management system is communicated with other modules of the optical storage, charging and discharging integrated system for time sharing users and the electric vehicle battery BMS management system, acquires data of all elements of the system and the electric vehicle battery BMS in real time, acquires an operation state, controls a system power electronic energy conversion device and a power switching device, realizes various operation modes of the system, charges and discharges an electric vehicle battery and an energy storage battery, and protects the elements. The bidirectional direct current-direct current conversion device and the bidirectional alternating current-direct current conversion device are controlled to carry out soft switching of the electric energy direction. And the hardware switching of the flow direction of the electric energy is performed by controlling the electric power switching device.
Fig. 2 is an example of a system topology diagram when photovoltaic power generation is performed, and it is convenient to understand that only one path is drawn by the photovoltaic array, and the cloud management platform and the terminal APP are not drawn. When the sun light is sufficient, the photovoltaic array works, and electric energy flows from the photovoltaic array to the bidirectional direct current-direct current conversion device and the direct current bus, and then flows to the energy storage battery system or flows to the power grid or the load through the bidirectional alternating current-direct current conversion device. At this time, the internal switch of the power switching device is turned off to block the connection between the battery of the electric vehicle and the bidirectional direct current-direct current conversion device, and the electric vehicle is not charged or discharged.
Fig. 3 is an example of a system topology diagram when the photovoltaic does not generate electricity, and for convenience of understanding, only one path is drawn by the photovoltaic array, and the cloud management platform and the terminal APP are not drawn. At this time, the battery of the electric automobile can be charged or discharged, the photovoltaic array is isolated from the bidirectional direct current-direct current conversion device by the photovoltaic array with the reverse-preventing element, and the MPPT function of the bidirectional direct current-direct current conversion device is controlled by the EMS to be disabled. Under the condition, when the electric vehicle battery has charge and discharge requirements, the electric power switching device is communicated with the electric vehicle battery and the bidirectional direct current-direct current conversion device. In order to rapidly charge or discharge the electric automobile battery, a charging or discharging mode of the electric automobile battery can be set through a local HMI interface of the EMS energy management system or a mobile terminal APP.
The solid arrows in fig. 3 show a scenario in which the battery of the electric vehicle is charged with the maximum power, and the solid arrows point to the flow of electric energy when the battery of the electric vehicle is charged. At this time, two paths of electric energy from the energy storage battery and the alternating current power grid directly flow to the electric automobile through the direct current bus, the bidirectional direct current-direct current conversion device and the electric power switching device. The dashed arrow in fig. 3 shows a scenario in which the electric vehicle battery is discharged at maximum power, and the dashed arrow points to the flow of electric energy when the electric vehicle battery is discharged. At this time, the electric energy from the battery of the electric automobile flows to the direct current bus through the electric power switching device and the bidirectional direct current-direct current conversion device, then flows to the energy storage battery from the direct current bus, and simultaneously flows to the alternating current power grid and the alternating current load from the direct current bus through the bidirectional alternating current-direct current packaging device for discharging. This mode requires the electric vehicle battery BMS system to support a discharging protocol.
The typical working mode of the household optical storage charge and discharge integrated system for the time sharing provided by the invention is that: when Bai Tianguang V array generates electricity, the battery of the electric automobile does not participate in charge and discharge; and when the photovoltaic array does not work at night, the electric automobile is charged through the bidirectional direct current-direct current conversion device. The mode is very friendly to users who need to go home for charging at night when the electric automobile is started on duty in the daytime, and is suitable for office workers who mostly have the light storage system for the users.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent modes of operation which are described in the specification and drawings of the present invention or which can be directly or indirectly employed in other related technical fields are equally encompassed by the scope of the present invention.
Claims (7)
1. The utility model provides a time sharing user is with storing up integration system of putting, its characterized in that, system electricity generation when solar illumination is sufficient can be for electric vehicle quick charge and discharge when the system does not generate electricity, and this system includes:
the system comprises a photovoltaic array, a bidirectional direct current-direct current conversion device, an electric power switching device, an energy storage battery system, a direct current bus, a bidirectional alternating current-direct current conversion device, an EMS energy management system, a cloud management platform and a terminal APP. The power switching device is connected with the bidirectional direct current-direct current conversion device and an electric vehicle battery (through a charging gun); the bidirectional direct current-direct current conversion device is connected with the power switching device, the photovoltaic array and the direct current bus; the energy storage battery system is directly connected with the direct current bus; the bidirectional alternating current-direct current conversion device is connected with a direct current bus, an alternating current power grid and an alternating current load, and the alternating current side can be a single-phase or three-phase system; the EMS energy management system is communicated with other modules of the household optical storage charge-discharge integrated system and the battery management system of the battery BMS of the electric vehicle, and is used for carrying out soft switching on the flow direction of electric energy by controlling the bidirectional direct current-direct current conversion device and the bidirectional alternating current-direct current conversion device and carrying out hard switching on the flow direction of the electric energy by controlling the electric power switching device.
2. The integrated household-light storage and release system according to claim 1, wherein:
when photovoltaic power generation is performed, electric energy flows from the photovoltaic array to the bidirectional direct current-direct current conversion device. According to the arrangement and capacity of the photovoltaic array, the photovoltaic array can be connected into a single-path or multi-path MPPT port of the bidirectional direct current-direct current conversion device through a single path or multiple paths, so that the maximum power tracking of photovoltaic power generation is realized. At this time, the power switching device blocks the connection between the electric vehicle battery and the bidirectional dc-dc conversion device.
3. The integrated household-light storage and release system according to claim 1, wherein:
when the photovoltaic does not generate electricity, the photovoltaic array is isolated from the bidirectional direct current-direct current conversion device by the photovoltaic array with the reverse-direction prevention element, and the MPPT function of the bidirectional direct current-direct current conversion device is controlled by the EMS to be disabled. Under the condition, when the electric vehicle battery has charge and discharge requirements, the electric power switching device is communicated with the electric vehicle battery and the bidirectional direct current-direct current conversion device.
4. A household-time light storage and release integrated system according to claims 1 and 3, characterized in that:
when the photovoltaic does not generate electricity, the system charges the battery of the electric automobile according to the control instruction of the EMS system. Electric energy from the energy storage battery or the alternating current power grid flows to the battery of the electric automobile through the bidirectional alternating current-direct current conversion device or simultaneously from the energy storage battery or the alternating current power grid through the direct current bus, the bidirectional direct current-direct current conversion device and the electric power switching device.
5. A household-time light storage and release integrated system according to claims 1 and 3, characterized in that:
when the photovoltaic does not generate electricity, the electric automobile battery discharges to the system according to the control instruction of the EMS system. The electric energy from the battery of the electric automobile flows to the energy storage battery through the electric power switching device, the bidirectional direct current-direct current conversion device and the direct current bus, or continuously flows to the alternating current power grid or the alternating current load from the direct current bus through the bidirectional direct current-direct current conversion device, or flows to the three at the same time. This mode requires the electric vehicle battery BMS system to support a discharging protocol.
6. The integrated household-light storage and release system according to claim 1, wherein:
the power switching device may be constituted by an electrical switch, a contactor or a solid state electronic switch.
7. The integrated household-light storage and release system according to claim 1, wherein:
the system can work in various operation modes such as photovoltaic power generation, electric vehicle charging and discharging, energy storage charging and discharging and the like, and the setting of the system can be completed by a human-computer interaction terminal of a local EMS energy management system HMI and an APP of mobile terminal equipment (mobile phone, tablet personal computer and the like). The EMS energy management system and the cloud server interact data and control signals through a communication protocol, and the EMS energy management system is locally configured with a 4G or 5G module and a local wired or wireless router. The mobile terminal device can set the working mode of the optical storage, charging and discharging integrated system and monitor the running state of the optical storage, charging and discharging integrated system in situ through a wired or wireless network or remotely through a 4G or 5G network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310142923.XA CN116031921A (en) | 2023-02-21 | 2023-02-21 | Time-sharing household optical storage, charging and discharging integrated system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310142923.XA CN116031921A (en) | 2023-02-21 | 2023-02-21 | Time-sharing household optical storage, charging and discharging integrated system |
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| Publication Number | Publication Date |
|---|---|
| CN116031921A true CN116031921A (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310142923.XA Pending CN116031921A (en) | 2023-02-21 | 2023-02-21 | Time-sharing household optical storage, charging and discharging integrated system |
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| CN (1) | CN116031921A (en) |
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- 2023-02-21 CN CN202310142923.XA patent/CN116031921A/en active Pending
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