Mobile photovoltaic energy storage charging system based on distributed direct current coupling architecture

Abstract

The invention discloses a mobile photovoltaic energy storage charging system based on a distributed direct current coupling architecture, belongs to the technical field of photovoltaic energy storage charging equipment, and aims to solve the problems of relatively high investment cost and relatively low energy conversion efficiency caused by relatively many component controllers and couplings. Comprising a mobile distributed DC coupling architecture module and an all-in-one controller. A distributed direct current coupling framework is adopted, on a mobile energy storage charging vehicle or a fixed energy storage charging pile, by multiplexing a DCDC power module and through algorithm switching, photovoltaic charging of an energy storage battery and charging of a new energy vehicle by a mobile charging trolley are achieved, and meanwhile charging or discharging of a micro-grid can be achieved by matching with an energy storage inverter; the main hardware power topology of the photovoltaic MPPT controller is a bidirectional Boost topology, a Buck-Boost topology or a bidirectional DAB topology, and the off-grid mobile energy storage charging core power module can realize wide voltage output through the Buck-Boost by means of a DCDC converter, so that the charging of most new energy batteries on the market is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic energy storage charging equipment, and particularly relates to a mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture. Background Art

[0002] Distributed photovoltaic energy storage charging equipment refers to a device that converts solar energy into electrical energy through solar panels and stores the electrical energy using an energy storage system (such as a battery), and then supplies power to other devices or systems through a charging device when needed.

[0003] The direct current generated by a photovoltaic array (solar panel) is first converted into alternating current through an energy storage inverter and supplied for household or industrial use. The remaining power is stored in an energy storage device such as a battery, and when the solar energy is insufficient or the power grid is out of power, the stored electrical energy can be released to ensure the continuity of power supply.

[0004] Most of the existing distributed photovoltaic energy storage charging equipment on the market is fixed in the station, which requires complex infrastructure construction, system load, and a multi-level scheme architecture, resulting in low energy conversion efficiency. Especially when the existing photovoltaic power in the station cannot be consumed or the capacity is insufficient and dynamic energy storage adjustment is required, the deployment time is long and inflexible.

[0005] As shown in the appendix Figure 1 The conventional electrical architecture of an energy storage charging pile on the market includes a photovoltaic panel, a photovoltaic inverter, an energy storage battery system, an energy storage inverter, and a charging pile, etc.

[0006] The deficiencies of this solution are as follows:

[0007] 1. It includes two inverters, and each component requires an independent controller, resulting in a high cost;

[0008] 2. When the photovoltaic power generation charging pile cannot consume the power, the energy of the photovoltaic needs to pass through the photovoltaic inverter and the energy storage inverter to be stored in the battery, which will reduce the conversion efficiency;

[0009] 3. When the energy of the photovoltaic power generation cannot support the charging pile and the energy of the energy storage battery needs to be supplemented, it also needs to pass through a primary energy storage inverter, reducing the conversion efficiency;

[0010] 4. When expansion is required, there are many component couplings, and the expansion and transformation cost is relatively high.

[0011] Therefore, a mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture is needed to solve the problems of high investment and construction costs and low energy conversion efficiency caused by more component controllers and couplings in the existing technology. Summary of the Invention

[0012] The purpose of the present invention is to provide a mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture to solve the problems raised in the above background technology.

[0013] To achieve the above object, the present invention provides the following technical solution: a mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture, comprising a mobile distributed DC coupling architecture module and an all-in-one controller, wherein the all-in-one controller is arranged on the mobile distributed DC coupling architecture module, wherein:

[0014] The mobile distributed DC coupling architecture module also includes a mobile energy storage charging vehicle, a photovoltaic array, a photovoltaic interface, a battery system, an energy storage inverter and a charging gun. The photovoltaic interface, the battery system and the charging gun are integrated on the mobile energy storage charging vehicle. The photovoltaic array is electrically connected to the photovoltaic interface through a wire. The photovoltaic array is used to charge the battery system. The energy storage inverter is used to realize charging or discharging to the microgrid.

[0015] The main hardware power topology of the all-in-one controller is a bidirectional DCDC converter, the DCDC converter is connected to a DC fast charging relay, an S1 control switch is set between the all-in-one controller and the photovoltaic array, an S2 control switch is set between the all-in-one controller and the battery system, an S3 control switch is set between the all-in-one controller and the charging gun, and an S4 control switch is set between the all-in-one controller and the energy storage inverter. The specific operation process is as follows:

[0016] a. When the photovoltaic cell is connected to the car interface, when the photovoltaic panel generates energy, the S1 control switch can be closed, the S2 control switch can be closed, and the DCDC works in the MPPT mode, while replenishing the battery;

[0017] b. When the battery is fully charged and the photovoltaic cell still has energy, the S1 control switch can be closed, the S4 control switch can be closed, and the DCDC works in the energy storage inverter mode, and the output is stable in the constant voltage mode required by the energy storage inverter;

[0018] c. When the photovoltaic cell has no energy and the battery has surplus power, DCDC can work in DC fast charging mode, and cooperate with DC fast charging relay S3 to control the switch, so as to charge the new energy vehicle;

[0019] d. In the V2G mode of new energy vehicles, the new energy vehicles can discharge to the grid by closing S3 to control the switch fast charging relay and S4 to control the switch energy storage inverter DC relay.

[0020] It should be noted in the solution that the all-in-one controller power topology can be a non-isolated bidirectional Boost or Buck-Boost converter, or an isolated DAB converter.

[0021] It should also be noted that the all-in-one controller also includes a multiplexed power module, which can reduce the number of devices, reduce system complexity, and improve system stability.

[0022] Compared with the prior art, the mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture provided by the present invention has at least the following beneficial effects:

[0023] (1) The present invention adopts a distributed DC coupling architecture. On a mobile energy storage charging vehicle or a fixed energy storage charging pile, by reusing the DCDC power module and switching the algorithm, photovoltaic charging of energy storage batteries and mobile charging vehicles charging of new energy vehicles can be realized. At the same time, with the energy storage inverter, charging or discharging to the microgrid can be realized.

[0024] (2) The main hardware power topology of the photovoltaic MPPT controller of the present invention is a bidirectional Boost, Buck-Boost or bidirectional DAB topology. The core power module of the off-grid mobile energy storage charging is also through a DCDC converter. A wide voltage output voltage can be achieved through a bidirectional Buck-Boost or bidirectional DAB converter to meet the charging needs of most new energy batteries on the market. Reusing power modules can reduce the number of devices, reduce system complexity, and improve system stability.

[0025] (3) In the mobile solar storage and charging scenario, the present invention has the ability to quickly respond to energy, and the DC bus voltage can be quickly adjusted to adapt to the fluctuations in photovoltaic power generation power and changes in load demand.

[0026] (4) After the mobile energy storage charging vehicle of the present invention adopts this solution, it can be more flexibly combined with photovoltaic, power grid, and new energy vehicle charging, making it easier to expand the product's usage scenarios and more convenient to expand capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the electrical architecture of a conventional energy storage charging station in the prior art;

[0028] Figure 2 It is a schematic diagram of the structure of the movable distributed DC coupling architecture of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the all-in-one controller system of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the embodiments.

[0031] See also Figure 2-3The present invention provides a mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture, comprising a mobile distributed DC coupling architecture module and an all-in-one controller, wherein the all-in-one controller is arranged on the mobile distributed DC coupling architecture module, wherein:

[0032] The mobile distributed DC coupling architecture module also includes a mobile energy storage charging vehicle, a photovoltaic array, a photovoltaic interface, a battery system, an energy storage inverter and a charging gun. The photovoltaic interface, the battery system and the charging gun are integrated on the mobile energy storage charging vehicle. The photovoltaic array is electrically connected to the photovoltaic interface through a wire. The photovoltaic array is used to charge the battery system. The energy storage inverter is used to realize charging or discharging to the microgrid.

[0033] The main hardware power topology of the all-in-one controller is a bidirectional DCDC converter, which is connected to a DC fast charging relay. An S1 control switch is set between the all-in-one controller and the photovoltaic array, an S2 control switch is set between the all-in-one controller and the battery system, an S3 control switch is set between the all-in-one controller and the charging gun, and an S4 control switch is set between the all-in-one controller and the energy storage inverter. The specific operation process is as follows, as shown in the attached figure. Figure 3 As shown:

[0034] a. When the photovoltaic cell is connected to the car interface, when the photovoltaic panel generates energy, the S1 control switch can be closed, the S2 control switch can be closed, and the DCDC works in the MPPT mode, while replenishing the battery;

[0035] b. When the battery is fully charged and the photovoltaic cell still has energy, the S1 control switch can be closed, the S4 control switch can be closed, and the DCDC works in the energy storage inverter mode, and the output is stable in the constant voltage mode required by the energy storage inverter;

[0036] c. When the photovoltaic cell has no energy and the battery has surplus power, DCDC can work in DC fast charging mode, and cooperate with DC fast charging relay S3 to control the switch, so as to charge the new energy vehicle;

[0037] d. In the V2G mode of new energy vehicles, the new energy vehicles can discharge to the grid by closing S3 to control the switch fast charging relay and S4 to control the switch energy storage inverter DC relay.

[0038] Each mode is switched through functional logic interlocking. When the all-in-one module enters another mode, it must receive instructions from the controller or dispatch from the energy management system.

[0039] Furthermore, it is worth specifying that the power topology of the all-in-one controller can be said to be a non-isolated bidirectional Boost, Buck-Boost or bidirectional DAB topology, or it can be an isolated DAB converter, which can achieve a wide voltage output voltage through Buck-Boost to meet the charging needs of most new energy batteries on the market. The all-in-one controller also includes a reused power module, which can reduce the number of devices, reduce system complexity, and improve system stability.

[0040] The present invention adopts a distributed DC coupling architecture. On a mobile energy storage charging vehicle or a fixed energy storage charging pile, by reusing the DCDC power module and switching the algorithm, photovoltaic charging of energy storage batteries and mobile charging vehicles charging of new energy vehicles can be realized. At the same time, with the energy storage inverter, charging or discharging to the microgrid can be realized.

[0041] According to the above working process, it can be known that the main hardware power topology of the photovoltaic MPPT controller of the present invention is bidirectional Boost, Buck-Boost or bidirectional DAB topology, and the core power module of the off-grid mobile energy storage charging is also through the DCDC converter, which can achieve a wide voltage output voltage through Buck-Boost to meet the charging of most new energy batteries on the market. Reusing power modules can reduce the number of equipment, reduce system complexity, and improve system stability.

[0042] This plan has the following working process: Figure 3 As shown in the figure, under the setting of the all-in-one controller, in the photovoltaic charging mode, when the photovoltaic battery is connected to the car interface, when the photovoltaic panel generates energy, the S1 control switch and the S2 control switch can be closed, and the DCDC works in the MPPT mode and charges the battery at the same time; when the battery is fully charged, if the photovoltaic battery still has energy, the S1 control switch and the S4 control switch can be closed, and the DCDC works in the energy storage inverter mode, and the output is stable in the working constant voltage mode required by the energy storage inverter; when the photovoltaic battery has no energy and the battery has surplus power, the DCDC can work in the DC fast charging mode, and cooperate with the DC fast charging relay S3 to control the switch, so as to charge the new energy vehicle; in the V2G mode of the new energy vehicle, the S3 control switch fast charging relay and the S4 control switch energy storage inverter DC relay can be closed to realize the discharge of the new energy vehicle to the grid; the modes are switched by functional logic interlocking judgment before each mode, and when the all-in-one module enters another mode, it must receive the controller instruction or the energy management system dispatch.

[0043] In summary, the present invention adopts a distributed DC coupling architecture. On a mobile energy storage charging vehicle or a fixed energy storage charging pile, by reusing the DCDC power module and through algorithm switching, it realizes charging of the energy storage battery by the photovoltaic power generation and charging of new energy vehicles by the mobile charging trolley. At the same time, with the energy storage inverter, it can realize charging or discharging to the microgrid. The main hardware power topology of the photovoltaic MPPT controller of the present invention is a DCDC (Boost or Buck - Boost) converter, and the core power module of the off - grid mobile energy storage charging is also a DCDC converter. A wide - voltage output voltage can be achieved through a bidirectional Buck - Boost or a bidirectional DAB converter, meeting the charging requirements of most new energy batteries in the market. Reusing the power module can reduce the number of devices, lower the system complexity, and improve the system stability. In the mobile photovoltaic - energy storage - charging scenario of the present invention, it has the ability of rapid energy response, and the DC bus voltage can be quickly adjusted to adapt to the power fluctuation of photovoltaic power generation and the change of load demand. After adopting this solution, the mobile energy storage charging trolley can be more flexibly combined with photovoltaic power generation, the power grid, and new energy vehicle charging, making it easier to expand the application scenarios of the product and more convenient for capacity expansion.

[0044] The above - mentioned embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, the above - mentioned embodiments can be implemented in whole or in part in the form of a computer program product.

[0045] Those of ordinary skill in the art can realize that the modules and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0046] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above - described systems, devices, and modules can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0047] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the devices or modules can be in electrical, mechanical, or other forms.

[0048] The modules described as separate components may or may not be physically separated. The components displayed as modules may or may not be physical modules. They can be located in one place or distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0049] In addition, in each embodiment of the present application, the functional modules can be integrated in a processing module, or each module can exist physically alone, or two or more modules can be integrated in one module.

[0050] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0051] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture, characterized in that: It includes a mobile distributed DC coupling architecture module and an all-in-one controller, wherein the all-in-one controller is arranged on the mobile distributed DC coupling architecture module, wherein: The mobile distributed DC coupling architecture module also includes a mobile energy storage charging vehicle, a photovoltaic array, a photovoltaic interface, a battery system, an energy storage inverter and a charging gun. The photovoltaic interface, the battery system and the charging gun are integrated on the mobile energy storage charging vehicle. The photovoltaic array is electrically connected to the photovoltaic interface through a wire. The photovoltaic array is used to charge the battery system. The energy storage inverter is used to realize charging or discharging to the microgrid. The main hardware power topology of the all-in-one controller is a bidirectional DCDC converter, the DCDC converter is connected to a DC fast charging relay, an S1 control switch is set between the all-in-one controller and the photovoltaic array, an S2 control switch is set between the all-in-one controller and the battery system, an S3 control switch is set between the all-in-one controller and the charging gun, and an S4 control switch is set between the all-in-one controller and the energy storage inverter. The specific operation process is as follows: a. When the photovoltaic cell is connected to the car interface, when the photovoltaic panel generates energy, the S1 control switch can be closed, the S2 control switch can be closed, and the DCDC works in the MPPT mode, while replenishing the battery; b. When the battery is fully charged and the photovoltaic cell still has energy, the S1 control switch can be closed, the S4 control switch can be closed, and the DCDC works in the energy storage inverter mode, and the output is stable in the constant voltage mode required by the energy storage inverter; c. When the photovoltaic cell has no energy and the battery has surplus power, DCDC can work in DC fast charging mode, and cooperate with DC fast charging relay S3 to control the switch, so as to charge the new energy vehicle; d. In the V2G mode of new energy vehicles, the new energy vehicles can discharge to the grid by closing S3 to control the switch fast charging relay and S4 to control the switch energy storage inverter DC relay.

2. The mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture according to claim 1, wherein: The all-in-one controller power topology is a non-isolated bidirectional Boost or Buck-Boost converter or an isolated DAB converter.

3. The mobile photovoltaic energy storage charging system based on a distributed DC coupling architecture according to claim 2, characterized in that: The all-in-one controller also includes a multiplexed power module, which can reduce the number of devices, reduce system complexity, and improve system stability.

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