Zero-carbon system based on smart energy management

Abstract

The invention relates to a zero-carbon system based on smart energy management. The zero-carbon system comprises a smart energy management system, a low-voltage flexible AC / DC distribution device, a power generation unit, energy storage equipment, an AC load and a DC load, the low-voltage flexible AC / DC distribution device comprises an AC / DC converter; the alternating current end of the AC / DC converter is connected with an alternating current load and an alternating current large power grid grid-connected port, and the direct current end of the AC / DC converter is connected with the power generation unit, the energy storage equipment and a direct current load; the smart energy management system collects real-time power utilization information of the alternating current load and the direct current load, output voltage of the power generation unit and electric energy storage information of the energy storage equipment, and the alternating current large power grid, the power generation unit and / or the energy storage equipment supply power to the alternating current load and the direct current load by controlling the low-voltage flexible alternating current and direct current distribution device; through the photovoltaic and energy storage smart energy management system, the surplus power generation amount is stored, and the required power supply amount is deployed, so that the power supply-power storage overall distribution control of the whole target power utilization area is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy power generation, power consumption, and energy storage and distribution, and in particular to a zero-carbon system based on smart energy management. Background Art

[0002] In order to promote the consumption of new energy, combined with the smart energy management system, we actively promote the innovative application of green and low-carbon new energy technologies in traditional municipal power systems such as various parks and warehouses.

[0003] The current photovoltaic and wind power generation systems, due to their characteristics of being influenced by solar power generation and climate, generally have a mismatch between new energy power generation and the electricity consumption time of various parks and warehouses, resulting in low utilization of new energy power generation or impact on the large power grid when power is connected to the grid. Large power grids are often disconnected and light and wind (new energy) are abandoned due to impacts, resulting in a low input-output ratio of new energy, especially photovoltaic power generation, affecting the returns of new energy, especially photovoltaic investors.

[0004] From the above, it can be seen that the current photovoltaic power generation system has poor utilization effect, lacks intelligent adjustment and scheduling capabilities, and has low actual utilization value. Summary of the invention

[0005] The present invention aims to solve the technical problems existing in the prior art and provide a zero-carbon system based on smart energy management. According to a first aspect of the present invention, there is provided a zero-carbon system based on smart energy management, comprising: a smart energy management system, a low-voltage flexible AC / DC distribution device, a power generation unit, an energy storage device, an AC load and a DC load; The low-voltage flexible AC / DC distribution device comprises: an AC / DC converter; the AC end of the AC / DC converter is connected to an AC load and an AC large power grid connection port, and the DC end of the AC / DC converter is connected to a power generation unit, an energy storage device and a DC load; The smart energy management system collects real-time power consumption information of the AC load and DC load, the output voltage of the power generation unit and the power storage information of the energy storage device, and controls the low-voltage flexible AC / DC distribution device to enable the large AC power grid, power generation unit and / or energy storage device to supply power to the AC load and DC load.

[0006] Based on the above technical solution, the present invention can also make the following improvements.

[0007] Optionally, historical power consumption data of the AC load and the DC load are collected to establish a power consumption information database; The output power of the power generation unit and the capacity of the energy storage device are set based on the historical power consumption data.

[0008] Optionally, the discharge unit includes: a photovoltaic power generation unit; the zero-carbon system also includes: an AC load data metering device, a DC load data metering device, a power generation unit metering device and a BMS that are communicatively connected to the smart energy management system; The AC load data metering device is used to collect real-time power consumption information of the AC load and send it to the smart energy management system; The DC load data metering device is used to collect real-time power consumption information of the DC load and send it to the smart energy management system; The power generation unit metering device is used to monitor the real-time output voltage of the power generation unit and send it to the smart energy management system; The BMS is used to monitor and manage the operating status of the rechargeable battery of the energy storage device, and send the operating status data of the rechargeable battery to the smart energy management system.

[0009] Optionally, the operating status includes: voltage, current, temperature and remaining power. The BMS includes: a battery pack management unit, a battery string management unit and a battery stack management unit, which respectively collect information on the voltage, current, temperature and remaining power of the charging battery pack, battery string and battery stack and send it to the smart energy management system.

[0010] Optionally, the zero-carbon system includes: an air source heat pump and a heat pump load data metering device; The air source heat pump is connected to the AC end of the AC / DC converter; The heat pump load data metering device is connected to the smart energy management system for communication, collects the power of the air source heat pump and sends it to the smart energy management system.

[0011] Optionally, the zero-carbon system includes: a charging pile and an electric energy meter; The charging pile is connected to the DC end of the AC / DC converter; The electric energy meter is in communication connection with the smart energy management system, collects information on the voltage, current, temperature and remaining power of the charging pile and sends it to the smart energy management system.

[0012] Optionally, the voltage of the DC load is DC375V; the voltage of the photovoltaic power generation unit, charging pile and energy storage equipment is DC750V; the voltage of the air source heat pump and the AC load is AC380V; the low-voltage flexible AC / DC distribution device is connected to the large AC power grid through a 10KV AC bus.

[0013] Optionally, the method for the large power grid, power generation unit and / or energy storage device to supply power to the AC load and the DC load includes: When the power of the AC load and the DC load is less than the output power of the power generation unit, the smart energy management system controls the zero-carbon system to be disconnected from the AC large power grid, controls the power generation unit to supply power to the AC load and the DC load, and sends the remaining power generated by the power generation unit to the energy storage device for storage; When the power of the AC load and the DC load is greater than or equal to the output power of the power generation unit and less than the sum of the output powers of the power generation unit and the energy storage device, the smart energy management system controls the zero-carbon system to be disconnected from the AC large power grid, and controls the power generation unit and the energy storage device to supply power to the AC load and the DC load; When the power of the AC load and the DC load is greater than or equal to the sum of the output powers of the power generation unit and the energy storage device, the smart energy management system controls the zero-carbon system to be connected to the AC power grid, and controls the power generation unit and the power grid to supply power to the AC load and the DC load.

[0014] The present invention provides a zero-carbon system based on smart energy management. Through the photovoltaic and energy storage smart energy management systems, on the one hand, surplus power generation is stored, and on the other hand, the required power supply is allocated, so as to realize the overall distribution control of supply-storage power in the entire target power-consuming area, so that insufficient storage power supply can be supplied in time without the help of city power, and at the same time, a large amount of surplus storage power can be consumed locally, which greatly reduces the dependence on city power, not only reduces the electricity cost, but also avoids the waste of new energy electric energy, and maximizes the supply-storage power distribution control effect of the entire target power-consuming area, and has high practical value; through online monitoring and dynamic data analysis of the energy consumption of energy-consuming equipment, the energy control management and conversion methods between new energy power generation, energy storage and energy-consuming equipment are dynamically adjusted and dispatched, that is, the charging strategy between new energy power generation and energy storage equipment, the discharging strategy between energy storage equipment and energy-consuming equipment, the power safety guarantee strategy of energy-consuming equipment, and the off-grid strategy between microgrid and large power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a zero-carbon system based on smart energy management provided by the present invention; Figure 2 Shown is a schematic diagram of an embodiment of a low-voltage flexible AC / DC distribution device provided by the present invention and its external connections. DETAILED DESCRIPTION

[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0017] Figure 1A schematic diagram of a zero-carbon system based on smart energy management provided by the present invention is shown in FIG. Figure 1 As shown, the zero-carbon system includes: a smart energy management system, a low-voltage flexible AC / DC distribution device, a power generation unit, an energy storage device, an AC load and a DC load.

[0018] The low voltage flexible AC / DC distribution device includes: an AC / DC converter; the AC end of the AC / DC converter is connected to the AC load and the AC large power grid grid connection port, and the DC end of the AC / DC converter is connected to the power generation unit, the energy storage device and the DC load.

[0019] The smart energy management system collects real-time power consumption information of AC loads and DC loads, the output voltage of the power generation unit and the power storage information of the energy storage device, and controls the low-voltage flexible AC / DC distribution device to enable the large AC power grid, power generation unit and / or energy storage device to supply power to the AC loads and DC loads.

[0020] In specific implementation, energy storage equipment is used for charging and storing energy for renewable energy power generation. When the power load cannot be fully consumed during the peak of renewable energy photovoltaic power generation, the excess power is directed by the smart energy management system to be stored in the energy storage equipment. When photovoltaic power generation is at a low point or stops, the smart energy management system dispatches the stored power for load power consumption.

[0021] AC loads and DC loads can be power loads for parks and warehouses, and various types of power loads in the park, including living, office, industrial, refrigeration, heating, and large warehouse loads.

[0022] The present invention provides a zero-carbon system based on smart energy management, which dynamically adjusts and dispatches the energy control management and conversion methods between new energy power generation, energy storage, and energy consuming equipment through online monitoring and dynamic data analysis of the energy consumption of energy-consuming equipment, namely, the charging strategy between new energy power generation and energy storage equipment, the discharging strategy between energy storage equipment and energy consuming equipment, the electricity safety guarantee strategy for energy consuming equipment, and the off-grid and on-grid strategy between microgrids and large power grids.

[0023] Example 1 Embodiment 1 provided by the present invention is an embodiment of a zero-carbon system based on smart energy management provided by the present invention, such as Figure 2 The figure shows a schematic diagram of an embodiment of a low voltage flexible AC / DC distribution device provided by the present invention and external connections, combined with Figure 1 and Figure 2 It can be seen that an embodiment of the zero-carbon system includes: a smart energy management system, a low-voltage flexible AC / DC distribution device, a power generation unit, an energy storage device, an AC load and a DC load.

[0024] The low voltage flexible AC / DC distribution device includes: an AC / DC converter; the AC end of the AC / DC converter is connected to the AC load and the AC large power grid grid connection port, and the DC end of the AC / DC converter is connected to the power generation unit, the energy storage device and the DC load.

[0025] The smart energy management system is used to count, collect and analyze the dynamic data of energy consumption and power generation and energy storage, collect the real-time power consumption information of AC loads and DC loads, the output voltage of the power generation unit and the energy storage information of the energy storage equipment, and control the low-voltage flexible AC / DC distribution device to enable the large AC power grid, power generation unit and / or energy storage equipment to supply power to the AC loads and DC loads.

[0026] In a possible implementation manner, historical power consumption data of AC loads and DC loads are collected to establish a power consumption information database.

[0027] The output power of the power generation unit and the capacity of the energy storage device are set based on historical power consumption data.

[0028] In a specific implementation, the electricity consumption information database is used to store the rated inverter efficiency and rated DC input voltage of the photovoltaic inverter corresponding to each individual electricity user, and to store the full-load storage capacity of the energy storage device corresponding to each individual electricity user.

[0029] It is also possible to calculate the energy consumption of AC and DC loads in each season, set the size of the photovoltaic power generation unit and the energy storage size of the energy storage device according to the historical electricity consumption data, and make the power output of the power generation unit and the energy storage device meet the power consumption of the AC and DC loads as much as possible. Photovoltaic power generation can adjust the output power by adjusting the number of photovoltaic panels.

[0030] In a possible implementation manner, the discharge unit includes: a photovoltaic power generation unit; the zero-carbon system also includes: an AC load data metering device, a DC load data metering device, a power generation unit metering device and a BMS (Battery Monitoring and Management System) that are communicatively connected to the smart energy management system.

[0031] The AC load data metering device is used to collect real-time power consumption information of the AC load and send it to the smart energy management system.

[0032] The DC load data metering device is used to collect real-time power consumption information of DC loads and send it to the smart energy management system.

[0033] The power generation unit metering device is used to monitor the real-time output voltage of the power generation unit and send it to the smart energy management system.

[0034] In a specific implementation, the AC load data metering device, the DC load data metering device and the power generation unit metering device can be metering instruments, i.e., energy consumption collectors such as electric meters, power monitoring terminals, water meters, heat meters, and temperature sensors, used to measure data such as electricity, water, and heat. The power generation monitoring end includes a photovoltaic energy meter and a voltage sensor, wherein the photovoltaic energy meter is used to collect photovoltaic power generation, the voltage sensor is set at the photovoltaic output end, and is used to monitor the photovoltaic power generation output voltage, and the power consumption monitoring end is an energy meter, wherein the power consumption monitoring end is set on the main power supply circuit, and is used to collect power consumption.

[0035] In specific implementation, the zero-carbon system also includes: a data gateway, which is used to collect data from various metering instruments such as water, electricity, and heating, and upload it to the smart management system.

[0036] Communication network module: divided into downlink communication between energy consumption collector and meter, and uplink communication between energy consumption collector and software system, including wired and wireless methods.

[0037] The multi-protocol communication management module is used to communicate data with various meters for collecting water, electricity, heating, etc.

[0038] BMS is used to monitor and manage the operating status of the rechargeable batteries of energy storage equipment, and send the operating status data of the rechargeable batteries to the smart energy management system.

[0039] In one possible implementation mode, the operating status includes: voltage, current, temperature and remaining power. The BMS includes: a battery pack management unit, a battery string management unit and a battery stack management unit, which respectively collect information on the voltage, current, temperature and remaining power of the charging battery pack, battery string and battery stack and send it to the smart energy management system.

[0040] The battery monitoring and management system is the core component of the energy storage device, which adopts a three-level BMS (battery management system), consisting of a battery pack management unit BMU, a battery string management unit BCMU, and a battery stack management unit BSMU.

[0041] In a possible implementation manner, the zero-carbon system includes: an air source heat pump and a heat pump load data metering device.

[0042] The air source heat pump is connected to the AC end of the AC / DC converter.

[0043] The heat pump load data metering device is connected to the smart energy management system for communication, collects the power of the air source heat pump and sends it to the smart energy management system.

[0044] In a possible implementation manner, the zero-carbon system includes: a charging pile and an electric energy meter.

[0045] The charging pile is connected to the DC end of the AC / DC converter.

[0046] The electric energy meter is connected to the smart energy management system for communication, and collects information on the voltage, current, temperature and remaining power of the charging pile and sends it to the smart energy management system.

[0047] In a possible implementation mode, the voltage of the DC load is DC375V; the voltage of the photovoltaic power generation unit, the charging pile and the energy storage device is DC750V; the voltage of the air source heat pump and the AC load is AC380V; the low-voltage flexible AC / DC distribution device is connected to the large AC power grid through a 10KV AC bus.

[0048] In a possible embodiment, a method for a large power grid, a power generation unit and / or an energy storage device to supply power to an AC load and a DC load includes: When the power of the AC load and the DC load is less than the output power of the power generation unit, the smart energy management system controls the zero-carbon system to be disconnected from the AC power grid, controls the power generation unit to supply power to the AC load and the DC load, and sends the remaining power generated by the power generation unit to the energy storage device for storage.

[0049] When the power of the AC load and the DC load is greater than or equal to the output power of the power generation unit and less than the sum of the output powers of the power generation unit and the energy storage device, the smart energy management system controls the zero-carbon system to be disconnected from the AC power grid, and controls the power generation unit and the energy storage device to supply power to the AC load and the DC load.

[0050] When the power of the AC load and the DC load is greater than or equal to the sum of the output powers of the power generation unit and the energy storage device, the smart energy management system controls the zero-carbon system to be connected to the AC power grid, and controls the power generation unit and the power grid to supply power to the AC load and the DC load.

[0051] Exemplarily, the target power consumption area mentioned above can be a residential area, an industrial park, an office park, etc. When the target power consumption area is a residential area, the corresponding individual power users are each residential building; when the target power consumption area is an industrial park, the corresponding individual power users are each enterprise; when the target power consumption area is an office park, the corresponding individual power users are each office building.

[0052] It should be noted that the calculation of the energy storage conversion efficiency in the present invention takes into account that the photovoltaic power generation output voltage of each individual electricity user is inconsistent with the rated input voltage of the energy storage device. In this case, there will be problems with conversion efficiency. The higher the conversion efficiency, the easier it is to store electricity, thereby reducing the storage time.

[0053] When performing hierarchical storage of surplus power generation, the present invention identifies individual power users who need to coordinate power storage allocation by comparing the surplus power generation corresponding to the surplus power generation users with the full-load storage capacity of the energy storage equipment, and comprehensively screens out the power storage allocation users in the power storage allocation process based on the excess storage capacity and the power storage conversion efficiency. Compared with screening based solely on the excess storage capacity, this screening method is more scientific and reliable, and can maximize the energy storage utilization rate of the energy storage equipment.

[0054] In view of the fact that currently various parks and warehouse systems mainly use municipal electricity (fossil energy) as the form of energy use, the present invention combines new energy power generation, energy storage, smart energy management system and various parks and warehouse power loads (including life, office, production, refrigeration, heating, etc.) to form a complete new energy full consumption management system. The characteristics are the full consumption of new energy and intelligent regulation and scheduling, making green energy observable, measurable, adjustable and controllable, and able to operate off-grid and on-grid, creating a smart and efficient new energy use environment, and improving the new energy consumption management level of various parks and warehouses. It has broad promotion significance for building a new power system of "source-grid-load-storage", achieving zero-carbon operation, and thus improving economic and social benefits.

[0055] The embodiment of the present invention provides a zero-carbon system based on smart energy management, which generates a set of new energy full-consumption intelligent management system composed of new energy power generation, energy storage, smart energy management system and power load (including life, office, production, refrigeration, heating, etc.), and can achieve the goal of not using or using the mains electricity to the minimum extent.

[0056] The present invention provides a zero-carbon system based on smart energy management. Through the photovoltaic and energy storage smart energy management systems, on the one hand, surplus power generation is stored, and on the other hand, the required power supply is allocated, so as to realize the overall distribution control of supply-storage power in the entire target power-consuming area, so that insufficient storage power supply can be supplied in time without the help of city power, and at the same time, a large amount of surplus storage power can be consumed locally, which greatly reduces the dependence on city power, not only reduces the electricity cost, but also avoids the waste of new energy electric energy, and maximizes the supply-storage power distribution control effect of the entire target power-consuming area, and has high practical value; through online monitoring and dynamic data analysis of the energy consumption of energy-consuming equipment, the energy control management and conversion methods between new energy power generation, energy storage and energy-consuming equipment are dynamically adjusted and dispatched, that is, the charging strategy between new energy power generation and energy storage equipment, the discharging strategy between energy storage equipment and energy-consuming equipment, the power safety guarantee strategy of energy-consuming equipment, and the off-grid strategy between microgrid and large power grid.

[0057] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0058] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0059] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0060] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0061] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0062] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0063] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A zero-carbon system based on smart energy management, characterized in that: The zero-carbon system includes: a smart energy management system, a low-voltage flexible AC / DC distribution device, a power generation unit, an energy storage device, an AC load and a DC load; The low-voltage flexible AC / DC distribution device comprises: an AC / DC converter; the AC end of the AC / DC converter is connected to an AC load and an AC large power grid connection port, and the DC end of the AC / DC converter is connected to a power generation unit, an energy storage device and a DC load; The smart energy management system collects real-time power consumption information of the AC load and DC load, the output voltage of the power generation unit and the power storage information of the energy storage device, and controls the low-voltage flexible AC / DC distribution device to enable the large AC power grid, power generation unit and / or energy storage device to supply power to the AC load and DC load.

2. The zero carbon system according to claim 1, characterized in that: Collecting historical power consumption data of the AC load and the DC load; The output power of the power generation unit and the capacity of the energy storage device are set based on the historical power consumption data.

3. The zero carbon system according to claim 1, characterized in that: The discharge unit includes: a photovoltaic power generation unit; the zero-carbon system also includes: an AC load data metering device, a DC load data metering device, a power generation unit metering device and a BMS that are communicatively connected to the smart energy management system; The AC load data metering device is used to collect real-time power consumption information of the AC load and send it to the smart energy management system; The DC load data metering device is used to collect real-time power consumption information of the DC load and send it to the smart energy management system; The power generation unit metering device is used to monitor the real-time output voltage of the power generation unit and send it to the smart energy management system; The BMS is used to monitor and manage the operating status of the rechargeable battery of the energy storage device, and send the operating status data of the rechargeable battery to the smart energy management system.

4. The zero-carbon system according to claim 3, wherein the operating state comprises: Voltage, current, temperature and remaining power The BMS includes: a battery pack management unit, a battery string management unit and a battery stack management unit, which respectively collect information on the voltage, current, temperature and remaining power of the rechargeable battery pack, battery string and battery stack and send it to the smart energy management system.

5. The zero carbon system according to claim 1, characterized in that: The zero-carbon system includes: an air source heat pump and a heat pump load data metering device; The air source heat pump is connected to the AC end of the AC / DC converter; The heat pump load data metering device is connected to the smart energy management system for communication, collects the power of the air source heat pump and sends it to the smart energy management system.

6. The zero carbon system according to claim 1, characterized in that: The zero-carbon system includes: a charging pile and an electric energy meter; The charging pile is connected to the DC end of the AC / DC converter; The electric energy meter is in communication connection with the smart energy management system, collects information on the voltage, current, temperature and remaining power of the charging pile and sends it to the smart energy management system.

7. The zero carbon system according to claim 1, characterized in that: The voltage of the DC load is DC375V; the voltage of the photovoltaic power generation unit, charging pile and energy storage equipment is DC750V; the voltage of the air source heat pump and the AC load is AC380V; the low-voltage flexible AC / DC distribution device is connected to the large AC power grid through a 10KV AC bus.

8. The zero carbon system according to claim 1, characterized in that: The method for the large power grid, power generation unit and / or energy storage device to supply power to the AC load and the DC load includes: When the power of the AC load and the DC load is less than the output power of the power generation unit, the smart energy management system controls the zero-carbon system to be disconnected from the AC large power grid, controls the power generation unit to supply power to the AC load and the DC load, and sends the remaining power generated by the power generation unit to the energy storage device for storage; When the power of the AC load and the DC load is greater than or equal to the output power of the power generation unit and less than the sum of the output powers of the power generation unit and the energy storage device, the smart energy management system controls the zero-carbon system to be disconnected from the AC large power grid, and controls the power generation unit and the energy storage device to supply power to the AC load and the DC load; When the power of the AC load and the DC load is greater than or equal to the sum of the output powers of the power generation unit and the energy storage device, the smart energy management system controls the zero-carbon system to be connected to the AC power grid, and controls the power generation unit and the power grid to supply power to the AC load and the DC load.

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