A distributed source-grid-load-storage micro-grid system

Abstract

The application discloses a kind of distributed source network load storage micro-grid systems, comprising: intelligent micro-grid, multiple distributed intelligent charging control terminal, dispatching control system;Wherein, distributed intelligent charging control terminal, including: central controller, wireless communication module, controllable inverter, controllable rectifier, DC charging load, distributed photovoltaic power supply, low-temperature superconducting thin film capacitor energy storage system;Wherein, low-temperature superconducting thin film capacitor energy storage system includes multiple energy storage modules arranged in underground low-temperature airtight metal cabin, and energy storage module is composed of multiple low-temperature superconducting thin film capacitors in parallel;Wherein, the refrigeration system of metal cabin adopts semiconductor refrigeration technology, and temperature and humidity monitor and thin film capacitor voltage monitoring system are arranged in metal cabin;The electric energy generated by distributed photovoltaic power supply in real time is stored in low-temperature superconducting thin film capacitor energy storage system, for distributed intelligent charging control terminal use.

Description

Technical Field

[0001] This invention belongs to the field of power grid technology, and more specifically, relates to a distributed microgrid system integrating power generation, grid, load, and storage. Background Technology

[0002] With the widespread adoption of smart charging stations, charging new energy vehicles is becoming increasingly convenient. However, due to the large fluctuations and high uncertainties in load, smart charging systems are not connected to the main power grid, and their DC power is derived from rectified AC power.

[0003] In related technologies, a microgrid model suitable for distributed photovoltaic power sources and smart charging pile load access has been proposed. However, the power transmission capacity of existing microgrid models is affected by the fluctuations of distributed power sources and loads, resulting in large voltage fluctuations and low stability. Furthermore, for low-voltage grid structures, the transmission distance is short. Adding distributed energy storage devices to the microgrid structure can significantly improve the stability of DC power transmission and increase the transmission distance. However, current energy storage devices used in grid architectures are mainly electrochemical energy storage, which has poor safety, short lifespan, and high failure rate, making it unsuitable for microgrid systems. Compared to traditional electrochemical energy storage devices, thin-film capacitors have advantages such as high safety factor, long lifespan, resistance to damage, and good corrosion resistance. However, their energy density is low; the capacity stored in a thin-film capacitor of the same volume cannot meet the needs of high-power power transmission in the grid, while large-capacity thin-film capacitors require a large space, making it difficult to meet the requirements of the intensive development of smart charging piles.

[0004] Therefore, how to improve the efficiency of energy storage in distributed generation-grid-load-storage systems and avoid operational problems caused by the shortcomings of electrochemical energy storage devices is a key concern for those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a distributed generation-grid-load-storage microgrid system to improve the energy storage effect in the distributed generation-grid-load-storage microgrid system and avoid problems such as insufficient energy storage and large space occupation of energy storage components.

[0006] To address the above-mentioned deficiencies or improvement needs of existing technologies, this invention provides a distributed microgrid system integrating power generation, grid, load, and storage, comprising: a smart microgrid, multiple distributed smart charging control terminals, and a dispatch and control system;

[0007] The smart microgrid is used to regulate the photovoltaic power system and the AC mains power system. The smart microgrid includes: an energy monitoring and control system and a smart microgrid AC cable.

[0008] The distributed intelligent charging control terminal includes: a central controller, a wireless communication module, a controllable inverter, a controllable rectifier, a DC charging load, a distributed photovoltaic power supply, and a low-temperature superconducting thin-film capacitor energy storage system.

[0009] The low-temperature superconducting thin-film capacitor energy storage system includes multiple energy storage modules housed within an underground low-temperature sealed metal chamber. Each energy storage module is composed of multiple low-temperature superconducting thin-film capacitors connected in parallel. The cooling system of the metal chamber employs semiconductor cooling technology, and the metal chamber is equipped with a temperature and humidity monitor and a thin-film capacitor voltage monitoring system. The electrical energy generated in real time by the distributed photovoltaic power source is stored in the low-temperature superconducting thin-film capacitor energy storage system and used by the distributed intelligent charging control terminal.

[0010] The scheduling and control system includes: a scheduling PTZ and a communication control master station.

[0011] Optionally, the distributed intelligent charging control terminal further includes: an intelligent charging pile; the distributed intelligent charging control terminal is used to output a drive signal to control the DC power generated by the distributed photovoltaic power source to output a stable power frequency AC power after passing through the controllable inverter and then into the intelligent microgrid; the charging load of the intelligent charging pile is taken from the AC power of the intelligent microgrid and processed by the controllable rectifier to obtain DC power with controllable voltage and current.

[0012] Optionally, the distributed photovoltaic power source is used to generate DC power through photovoltaic modules.

[0013] Optionally, the low-temperature superconducting thin-film capacitor energy storage system is used to store the electrical energy generated by the distributed photovoltaic power source through a low-temperature superconducting thin-film capacitor.

[0014] Optionally, the first power source of the smart microgrid is the surplus power of the distributed photovoltaic power source, and the second power source is AC mains power of the same frequency and voltage; the first power source and the second power source serve as backups for each other, with the first power source serving as the main power source; when the power generation of the distributed photovoltaic power source is lower than the preset power generation value or the DC charging load is higher than the preset load value, the backup power source is activated; when the backup power source fails or the line is shut down for maintenance, the distributed photovoltaic power source supplies power to the smart microgrid.

[0015] Optionally, the power energy monitoring and control system is used to monitor the power energy of the first power source and the second power source of the smart microgrid, obtain the monitoring results, and perform grid connection control based on the monitoring results.

[0016] Optionally, the smart microgrid AC cable is used to connect to the AC mains power grid.

[0017] Optionally, the scheduling and control system is used to acquire real-time data from the multiple distributed smart charging control terminals and the smart microgrid, analyze and process the real-time data, determine a real-time power scheduling strategy based on the analysis results, and send control signals to the distributed smart charging control terminals and the power monitoring and control system based on the real-time power scheduling strategy, so as to drive the corresponding controllable inverter to output the DC power stored in the low-temperature superconducting thin-film capacitor energy storage system to the smart microgrid; the controllable rectifier inputs the AC power of the smart microgrid to the smart charging pile with charging load, so as to realize the flexible scheduling and conversion of the DC power output from the distributed photovoltaic power source into the power of the DC charging load.

[0018] Optionally, the communication control master station is used to communicate in real time with the distributed intelligent charging control terminal and the power monitoring and control system of the intelligent microgrid through a wireless communication module.

[0019] Optionally, the scheduling platform is used to receive in real time charging load data collected by the distributed intelligent charging control terminal, DC voltage data of the energy storage system, and power quality data of the microgrid collected by the power energy monitoring and control system.

[0020] This application provides a distributed power-grid-load-storage microgrid system, comprising: a smart microgrid, multiple distributed smart charging control terminals, and a dispatch control system; wherein, the smart microgrid is used to regulate the photovoltaic power system and the AC mains power system, and the smart microgrid includes: an energy monitoring and control system and a smart microgrid AC cable; wherein, the distributed smart charging control terminal includes: a central controller, a wireless communication module, a controllable inverter, a controllable rectifier, a DC charging load, a distributed photovoltaic power source, and a low-temperature superconducting thin-film capacitor energy storage system; wherein, the low-temperature superconducting thin-film capacitor energy storage system includes multiple energy storage modules installed in an underground low-temperature sealed metal chamber, and each energy storage module is composed of multiple low-temperature superconducting thin-film capacitors connected in parallel; wherein, the cooling system of the metal chamber adopts semiconductor cooling technology, and the metal chamber is equipped with a temperature and humidity monitor and a thin-film capacitor voltage monitoring system; the electrical energy generated in real time by the distributed photovoltaic power source is stored in the low-temperature superconducting thin-film capacitor energy storage system for use by the distributed smart charging control terminals; wherein, the dispatch control system includes: a dispatch pan-tilt unit and a communication control master station.

[0021] It has the following beneficial effects:

[0022] By deploying a low-temperature superconducting thin-film capacitor energy storage system underground, distributed photovoltaic, thin-film energy storage, and smart charging piles can be integrated into a single system. This allows for the reliable connection of smart charging piles to the microgrid system. By improving the energy storage performance of the microgrid, the system enhances the effectiveness of the microgrid after grid connection and improves the stability and security of the power grid. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a distributed source-grid-load-storage microgrid system provided in an embodiment of this application. Detailed Implementation

[0025] The core of this application is to provide a distributed generation-grid-load-storage microgrid system to improve the energy storage effect in the distributed generation-grid-load-storage microgrid system and avoid problems such as insufficient energy storage and large space occupation of energy storage components.

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0027] The following embodiment illustrates a distributed source-grid-load-storage microgrid system provided in this application.

[0028] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a distributed source-grid-load-storage microgrid system provided in an embodiment of this application.

[0029] In this embodiment, the system may include:

[0030] Smart microgrid 1; Multiple distributed smart charging control terminals 2; Dispatch and control system 3;

[0031] Among them, the smart microgrid 1 is used to regulate the photovoltaic power system and the AC mains power system. The smart microgrid 1 includes: an electric energy monitoring and control system and a smart microgrid 1 AC cable.

[0032] Among them, the distributed intelligent charging control terminal 2 includes: a central controller, a wireless communication module, a controllable inverter, a controllable rectifier, a DC charging load, a distributed photovoltaic power supply, and a low-temperature superconducting thin-film capacitor energy storage system.

[0033] The low-temperature superconducting thin-film capacitor energy storage system includes multiple energy storage modules installed in an underground low-temperature sealed metal chamber. Each energy storage module is composed of multiple low-temperature superconducting thin-film capacitors connected in parallel. The cooling system of the metal chamber adopts semiconductor cooling technology, and a temperature and humidity monitor and a thin-film capacitor voltage monitoring system are installed inside the metal chamber. The electrical energy generated in real time by the distributed photovoltaic power source is stored in the low-temperature superconducting thin-film capacitor energy storage system and used by the distributed intelligent charging control terminal 2.

[0034] The dispatch control system 3 includes: a dispatch pan-tilt unit and a communication control master station.

[0035] The energy storage system uses cable reels made of thin-film capacitors as energy storage modules, and a multi-layer parallel structure can be adopted to increase its capacitance. This achieves space efficiency, environmental friendliness, safety, and stability. Furthermore, the internal insulation medium of the thin-film capacitors uses high-temperature and corrosion-resistant materials, resulting in a long service life. To reduce resistance loss, they can be laid in underground capacitor banks and cooled.

[0036] In this film capacitor cable, the width of the metal foil is equal to the cable length, and the length is positively correlated with the number of turns of the cable layers. The large area of ​​the metal foil and its large conductive cross-sectional area combine the advantages of large capacitance and low resistance. Furthermore, the cable's coil structure saves space in the longitudinal direction. Adopting a layered parallel structure in the longitudinal direction further increases the total capacitance, thereby enhancing the energy storage capacity.

[0037] Meanwhile, to improve the stability of the capacitor, the cable uses a mica paper-pressed rigid flame-retardant insulating shell to reliably fix the shape of the cable reel. The parallel structure between multiple layers is detachable and connected to the voltage monitoring system to monitor voltage fluctuations in real time. If one section has a local breakdown and the capacitance value decreases, it can continue to operate without affecting the overall performance of the capacitor bank. However, it can be replaced by power outage when necessary.

[0038] To reduce heat loss caused by the resistance of the thin-film capacitors, the metal storage chamber for the thin-film capacitors undergoes cryogenic treatment, reaching the critical temperature for thin-film superconductivity. Therefore, the thin-film capacitors exhibit low-temperature superconductivity. The refrigeration system within the metal chamber is based on semiconductor refrigeration technology, offering advantages such as cleanliness, zero pollution, and reduced emissions and energy consumption.

[0039] In summary, this embodiment achieves the integrated deployment of distributed photovoltaics, thin-film energy storage, and smart charging piles through an underground low-temperature superconducting thin-film capacitor energy storage system. This reliably connects the smart charging piles to the microgrid system, thereby improving the energy storage performance of the microgrid, enhancing the effect of the microgrid after grid connection, and improving the stability and security of the power grid.

[0040] Optionally, the distributed intelligent charging control terminal 2 also includes: an intelligent charging pile; the distributed intelligent charging control terminal 2 is used to output a drive signal so as to control the DC power generated by the distributed photovoltaic power source to output a stable power frequency AC power after passing through a controllable inverter and connecting it into the intelligent microgrid 1; the charging load of the intelligent charging pile is taken from the AC power of the intelligent microgrid 1 and processed by a controllable rectifier to obtain DC power with controllable voltage and current.

[0041] Optional, distributed photovoltaic power sources are used to generate DC power through photovoltaic modules.

[0042] Optionally, a low-temperature superconducting thin-film capacitor energy storage system is used to store electrical energy generated by distributed photovoltaic power sources through low-temperature superconducting thin-film capacitors.

[0043] Optionally, the first power source of the smart microgrid 1 is the surplus power of the distributed photovoltaic power source, and the second power source is AC mains power of the same frequency and voltage; the first power source and the second power source serve as backups for each other, with the first power source serving as the main power source; when the power generation of the distributed photovoltaic power source is lower than the preset power generation value or the DC charging load is higher than the preset load value, the backup power source is activated; when the backup power source fails or the line is shut down for maintenance, the distributed photovoltaic power source supplies power to the smart microgrid 1.

[0044] Optionally, an electrical energy monitoring and control system is used to monitor the electrical energy of the first and second power sources of the smart microgrid 1, obtain the monitoring results, and perform grid connection control based on the monitoring results.

[0045] Optional, the Smart Microgrid 1 AC cable is used to connect to the AC mains power grid.

[0046] Optionally, the dispatch control system 3 is used to acquire real-time data from multiple distributed smart charging control terminals 2 and smart microgrid 1, analyze and process the real-time data, determine a real-time power dispatch strategy based on the analysis results, and send control signals to the distributed smart charging control terminals 2 and the power monitoring and control system based on the real-time power dispatch strategy, so as to drive the corresponding controllable inverter to output the DC power stored in the low-temperature superconducting thin-film capacitor energy storage system to the smart microgrid 1; the controllable rectifier inputs the AC power of the smart microgrid 1 to the smart charging pile with charging load, so as to realize the flexible dispatch and conversion of the DC power output from the distributed photovoltaic power source into the power of the DC charging load.

[0047] Optionally, a communication control master station is used to communicate in real time with the distributed intelligent charging control terminal 2 and the power monitoring and control system of the smart microgrid 1 via a wireless communication module.

[0048] Optionally, a scheduling pan-tilt unit is used to receive in real time charging load data collected by the distributed intelligent charging control terminal 2, DC voltage data of the energy storage system, and power quality data of the microgrid collected by the power energy monitoring and control system.

[0049] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0050] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0051] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0052] The above provides a detailed description of a distributed source-grid-load-storage microgrid system provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A distributed source-grid-load-storage microgrid system, characterized in that, include: Smart microgrid, multiple distributed smart charging control terminals, and dispatch control system; The smart microgrid is used to regulate the photovoltaic power system and the AC mains power system. The smart microgrid includes: an energy monitoring and control system and a smart microgrid AC cable. The distributed intelligent charging control terminal includes: a central controller, a wireless communication module, a controllable inverter, a controllable rectifier, a DC charging load, a distributed photovoltaic power supply, and a low-temperature superconducting thin-film capacitor energy storage system. The low-temperature superconducting thin-film capacitor energy storage system includes multiple energy storage modules housed within an underground low-temperature sealed metal chamber. Each energy storage module is composed of multiple low-temperature superconducting thin-film capacitors connected in parallel. The cooling system of the metal chamber employs semiconductor cooling technology, and the metal chamber is equipped with a temperature and humidity monitor and a thin-film capacitor voltage monitoring system. The electrical energy generated in real time by the distributed photovoltaic power source is stored in the low-temperature superconducting thin-film capacitor energy storage system and used by the distributed intelligent charging control terminal. The dispatch control system includes: a dispatch pan-tilt unit and a communication control master station; The smart microgrid's first power source is the surplus power from the distributed photovoltaic power source, and the second power source is AC mains power of the same frequency and voltage. The first and second power sources serve as backups for each other, with the first power source acting as the primary power source. When the power generation of the distributed photovoltaic power source is lower than the preset power generation value or the DC charging load is higher than the preset load value, the backup power source is activated. When the backup power source fails or the line is shut down for maintenance, the smart microgrid is powered through the distributed photovoltaic power source. The power energy monitoring and control system is used to monitor the power energy of the first power source and the second power source of the smart microgrid, obtain the monitoring results, and perform grid connection control based on the monitoring results. The smart microgrid AC cable is used to connect to the AC power grid. The scheduling and control system is used to acquire real-time data from the multiple distributed smart charging control terminals and the smart microgrid, analyze and process the real-time data, determine a real-time power scheduling strategy based on the analysis results, and send control signals to the distributed smart charging control terminals and the power monitoring and control system based on the real-time power scheduling strategy. This drives the corresponding controllable inverters to output DC power stored in the low-temperature superconducting thin-film capacitor energy storage system to the smart microgrid. The controllable rectifier inputs AC power from the smart microgrid to smart charging piles with charging loads, so as to realize the flexible scheduling and conversion of DC power output from distributed photovoltaic power sources into DC charging load power.

2. The microgrid system according to claim 1, characterized in that, The distributed intelligent charging control terminal further includes: an intelligent charging pile; the distributed intelligent charging control terminal is used to output a drive signal to control the DC power generated by the distributed photovoltaic power source to output a stable power frequency AC power after passing through the controllable inverter and then into the intelligent microgrid; the charging load of the intelligent charging pile is taken from the AC power of the intelligent microgrid and processed by the controllable rectifier to obtain DC power with controllable voltage and current.

3. The microgrid system according to claim 2, characterized in that, The distributed photovoltaic power source is used to generate DC power through photovoltaic modules.

4. The microgrid system according to claim 3, characterized in that, The low-temperature superconducting thin-film capacitor energy storage system is used to store the electrical energy generated by the distributed photovoltaic power source through a low-temperature superconducting thin-film capacitor.

5. The microgrid system according to claim 4, characterized in that, The communication control master station is used to communicate in real time with the distributed intelligent charging control terminal and the power monitoring and control system of the intelligent microgrid through a wireless communication module.

6. The microgrid system according to claim 5, characterized in that, The dispatching platform is used to receive in real time charging load data collected by the distributed intelligent charging control terminal, DC voltage data of the energy storage system, and power quality data of the microgrid collected by the power energy monitoring and control system.

Images