Hybrid energy storage system and method, computer equipment and readable storage medium

Abstract

The invention provides a hybrid energy storage system and method, computer equipment and a readable storage medium, and the hybrid energy storage system comprises a gravity energy storage system, a photovoltaic power generation system and a wind power generation system. The gravity energy storage system, the photovoltaic power generation system and the wind power generation system are all connected with an alternating current power grid; the photovoltaic power generation system and the wind power generation system are used for outputting electric energy to the alternating current power grid and / or the gravity energy storage system; and the gravity energy storage system is used for outputting electric energy to the alternating current power grid. By adopting the method, the power supply quantity and the power supply efficiency are improved, the lack of power resources is avoided, and the power demand is met.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a hybrid energy storage system, method, computer device and readable storage medium. Background Art

[0002] The Shagohuang area is characterized by its vast sand, Gobi and desert. However, these areas are often far away from the city center and the power grid infrastructure is relatively weak. The gravity energy storage power station can play an important role in such an environment with its significant capacity advantages, low cost per kilowatt-hour and low dependence on the environment. It can not only store electricity on a large scale and reduce the cost per kilowatt-hour, but also reduce the impact on the environment, which meets the needs of sustainable development in the Shagohuang area. Therefore, gravity energy storage power stations are usually used in the existing technology to supply power to the Shagohuang area.

[0003] However, the study found that since the working principle of the gravity energy storage power station depends on the change of gravitational potential energy, compared with fast response technologies such as electrochemical energy storage, the response speed and power regulation speed of the gravity energy storage power station are relatively slow, which will lead to the fact that when the grid load changes sharply or the power needs to be adjusted quickly, the gravity energy storage power station may not be able to respond quickly, thereby reducing the power supply efficiency. In addition, although the gravity energy storage power station can meet part of the electricity demand in the Shagohuang area, with the development of the Shagohuang area, its electricity demand is also increasing. It is difficult to meet all electricity needs with a single gravity energy storage power station strategy, resulting in a shortage of electricity resources. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a hybrid energy storage system, method, computer device and readable storage medium to improve power supply and power supply efficiency, avoid the shortage of power resources and meet electricity demand.

[0005] In a first aspect, an embodiment of the present application provides a hybrid energy storage system, the hybrid energy storage system comprising a gravity energy storage system, a photovoltaic power generation system and a wind power generation system; the gravity energy storage system, the photovoltaic power generation system and the wind power generation system are all connected to an AC power grid;

[0006] The photovoltaic power generation system and the wind power generation system are used to output electric energy to the AC power grid and / or the gravity energy storage system; the gravity energy storage system is used to output electric energy to the AC power grid.

[0007] Optionally, the hybrid energy storage system includes an electrochemical energy storage system; the electrochemical energy storage system is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid;

[0008] The photovoltaic power generation system and the wind power generation system are used to output electric energy to the electrochemical energy storage system; the electrochemical energy storage system is used to store electric energy and also to output electric energy to the gravity energy storage system.

[0009] Optionally, the hybrid energy storage system includes a DC bus, a grid-connected inverter and a transformer; the grid-connected inverter and the gravity energy storage system are connected via the DC bus through the transformer;

[0010] The grid-connected inverter is used to convert the electric energy output by the gravity energy storage system from direct current to alternating current, and output it to the transformer; the transformer is used to connect the electric energy to the alternating current grid.

[0011] Optionally, the hybrid energy storage system further includes a first DC transformer and a first wind power converter, wherein one end of the first DC transformer is connected to the photovoltaic power generation system, and the other end is respectively connected to the gravity energy storage system, the wind power generation system, and the AC power grid through the DC bus; one end of the first wind power converter is connected to the wind power generation system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, and the AC power grid through the DC bus;

[0012] The first DC transformer is used for performing voltage conversion on the electric energy output by the photovoltaic power generation system; and the first wind power converter is used for performing voltage conversion on the electric energy output by the wind power generation system.

[0013] Optionally, the hybrid energy storage system further includes a second DC transformer; one end of the second DC transformer is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the DC bus;

[0014] The second DC transformer is used to perform voltage conversion on the electric energy output / input of the electrochemical energy storage system.

[0015] Optionally, the hybrid energy storage system further includes an AC collection bus, a photovoltaic inverter, and a second wind power converter, one end of the photovoltaic inverter is connected to the photovoltaic power generation system, and the other end is respectively connected to the gravity energy storage system, the wind power generation system, and the AC power grid through the AC collection bus; one end of the second wind power converter is connected to the wind power generation system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, and the AC power grid through the DC bus;

[0016] The photovoltaic inverter is used to convert the electric energy output by the photovoltaic power generation system from direct current to alternating current; the second wind power converter is used to convert the electric energy output by the wind power generation system from direct current to alternating current.

[0017] Optionally, the hybrid energy storage system further includes an energy storage converter; one end of the energy storage converter is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the AC collection bus;

[0018] The energy storage converter is used to convert the electric energy output by the electrochemical energy storage system from direct current to alternating current, or to convert the electric energy received by the electrochemical energy storage system through the alternating current bus from alternating current to direct current.

[0019] In a second aspect, an embodiment of the present application provides a hybrid energy storage method, which is applied to a hybrid energy storage system, wherein the hybrid energy storage system includes a gravity energy storage system, a photovoltaic power generation system, and a wind power generation system; the gravity energy storage system, the photovoltaic power generation system, and the wind power generation system are all connected to an AC power grid; the method includes:

[0020] The photovoltaic power generation system and the wind power generation system output electric energy to the AC power grid and / or the gravity energy storage system;

[0021] The gravity energy storage system outputs electrical energy to the AC power grid.

[0022] Optionally, the hybrid energy storage system includes an electrochemical energy storage system; the electrochemical energy storage system is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid; the method includes:

[0023] The photovoltaic power generation system and the wind power generation system output electric energy to the electrochemical energy storage system; the electrochemical energy storage system stores electric energy and also outputs electric energy to the gravity energy storage system.

[0024] Optionally, the hybrid energy storage system includes a DC bus, a grid-connected inverter and a transformer; the grid-connected inverter and the gravity energy storage system are connected via the DC bus through the transformer; and the method includes:

[0025] The grid-connected inverter converts the electric energy output by the gravity energy storage system from direct current into alternating current, and outputs it to the transformer; the transformer connects the electric energy to the alternating current grid.

[0026] Optionally, the hybrid energy storage system further includes a first DC transformer and a first wind power converter, one end of the first DC transformer is connected to the photovoltaic power generation system, and the other end is respectively connected to the gravity energy storage system, the wind power generation system, and the AC power grid through the DC bus; one end of the first wind power converter is connected to the wind power generation system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, and the AC power grid through the DC bus; the method includes:

[0027] The first DC transformer performs voltage conversion on the electric energy output by the photovoltaic power generation system; and the first wind power converter performs voltage conversion on the electric energy output by the wind power generation system.

[0028] Optionally, the hybrid energy storage system further includes a second DC transformer; one end of the second DC transformer is connected to the electrochemical energy storage system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the DC bus; the method includes:

[0029] The second DC transformer performs voltage conversion on the electric energy output / input of the electrochemical energy storage system.

[0030] Optionally, the hybrid energy storage system further includes an AC busbar, a photovoltaic inverter, and a second wind power converter, one end of the photovoltaic inverter is connected to the photovoltaic power generation system, and the other end is connected to the gravity energy storage system, the wind power generation system, and the AC power grid through the AC busbar; one end of the second wind power converter is connected to the wind power generation system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, and the AC power grid through the DC busbar; the method includes:

[0031] The photovoltaic inverter converts the electric energy output by the photovoltaic power generation system from direct current to alternating current; the second wind power converter converts the electric energy output by the wind power generation system from direct current to alternating current.

[0032] Optionally, the hybrid energy storage system further includes an energy storage converter; one end of the energy storage converter is connected to the electrochemical energy storage system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the AC busbar; the method includes:

[0033] The energy storage converter converts the electric energy output by the electrochemical energy storage system from direct current to alternating current, or converts the electric energy received by the electrochemical energy storage system through the alternating current bus from alternating current to direct current.

[0034] In a third aspect, an embodiment of the present application provides a computer device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the hybrid energy storage method described in any optional implementation manner of the second aspect are performed.

[0035] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the hybrid energy storage method described in any optional implementation manner in the second aspect above are executed.

[0036] The technical solution provided by this application includes but is not limited to the following beneficial effects:

[0037] The present application integrates a gravity energy storage system, a photovoltaic power generation system and a wind power generation system to obtain a hybrid energy storage system, and supplies power to the AC power grid through the photovoltaic power generation system, the wind power generation system and the gravity energy storage system at the same time, thereby increasing the power supply. In addition, the photovoltaic power generation system and the wind power generation system can also output electric energy to the gravity energy storage system when there is excess power generation, so that the gravity energy storage system can store energy, thereby avoiding power waste. In addition, the presence of the photovoltaic power generation system and the wind power generation system can compensate for the impact of the slow response speed of the gravity energy storage system, thereby improving the power supply efficiency. In general, the hybrid energy storage system provided in the present application can make full use of the rich natural resources in the Shagohuang area, such as solar energy and wind energy, as well as potential geographical advantages (such as high ground difference) for gravity energy storage, thereby greatly increasing the total power supply, effectively improving the power supply and power supply efficiency, avoiding the lack of power resources, and fully meeting the electricity demand in remote areas such as Shagohuang.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the structure of a hybrid energy storage system provided by Embodiment 1 of the present invention is shown;

[0041] Figure 2A schematic structural diagram of a second hybrid energy storage system provided in the first embodiment of the present invention is shown;

[0042] Figure 3 A schematic structural diagram of a third hybrid energy storage system provided in the first embodiment of the present invention is shown;

[0043] Figure 4 A schematic structural diagram of a fourth hybrid energy storage system provided in the first embodiment of the present invention is shown;

[0044] Figure 5 A schematic structural diagram of a fifth hybrid energy storage system provided in the first embodiment of the present invention is shown;

[0045] Figure 6 A schematic structural diagram of a DC-collecting hybrid energy storage system provided in Embodiment 1 of the present invention is shown;

[0046] Figure 7 A schematic structural diagram of a sixth hybrid energy storage system provided in the first embodiment of the present invention is shown;

[0047] Figure 8 A schematic structural diagram of a seventh hybrid energy storage system provided by the first embodiment of the present invention is shown;

[0048] Fig. 9 A schematic diagram of the structure of an AC-collection hybrid energy storage system provided in the first embodiment of the present invention is shown;

[0049] Fig.10 A schematic diagram of the structure of a computer device provided in Embodiment 3 of the present invention is shown. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0051] Embodiment 1

[0052] To facilitate understanding of this application, Figure 1The contents described in the structural schematic diagram of a hybrid energy storage system provided by the first embodiment of the present invention are described in detail for the first embodiment of the present application.

[0053] See also Figure 1 As shown, Figure 1 A structural schematic diagram of a hybrid energy storage system provided in Embodiment 1 of the present invention is shown, wherein the hybrid energy storage system includes a gravity energy storage system 101, a photovoltaic power generation system 102 and a wind power generation system 103; the gravity energy storage system, the photovoltaic power generation system and the wind power generation system are all connected to an AC power grid; the photovoltaic power generation system and the wind power generation system are used to output electric energy to the AC power grid and / or the gravity energy storage system; the gravity energy storage system is used to output electric energy to the AC power grid.

[0054] Specifically, in the hybrid energy storage system, the gravity energy storage system, photovoltaic power generation system and wind power generation system are all connected to the AC power grid. As the main renewable energy generation methods, the photovoltaic power generation system and the wind power generation system are responsible for supplying power to the AC power grid. At the same time, they can also store excess electricity in the gravity energy storage system for emergency use. The gravity energy storage system uses the lifting of heavy objects to store and release electricity. When the power grid needs it, it can quickly output electricity to the AC power grid to meet the power demand.

[0055] Furthermore, the system is divided into two types: a DC-collection hybrid energy storage system and an AC-collection hybrid energy storage system. In a DC-collection system, the electric energy generated by the photovoltaic power generation system and the wind power generation system is first converted into low-voltage DC power through their respective DC transformers, and then collected together through the DC bus. Then, these DC powers can be converted into AC power through a grid-connected inverter and then transmitted to the AC power grid. In addition, the gravity energy storage system is also connected to the DC bus through a series of mechanical and electrical devices to achieve the storage and release of electric energy. In an AC-collection system, the electric energy generated by the photovoltaic power generation system and the wind power generation system is converted into AC power through their respective inverters and then transmitted to the AC-collection bus. The gravity energy storage system is also connected to the AC-collection bus through corresponding electrical devices. This system structure is more flexible and can more easily achieve complementarity and optimization between different energy sources.

[0056] In an alternative embodiment, see Figure 2 As shown, Figure 2A structural schematic diagram of a second hybrid energy storage system provided in Example 1 of the present invention is shown, wherein the hybrid energy storage system includes an electrochemical energy storage system 104; the electrochemical energy storage system is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid; the photovoltaic power generation system and the wind power generation system are used to output electric energy to the electrochemical energy storage system; the electrochemical energy storage system is used to store electric energy and also to output electric energy to the gravity energy storage system.

[0057] Specifically, photovoltaic power generation systems and wind power generation systems are new energy power generation sources. They use solar energy and wind energy to generate electricity and inject the electricity into the electrochemical energy storage system for storage. When the power grid needs it, the electricity can also be released to the power grid. The electrochemical energy storage system quickly absorbs and emits electricity when there is volatility in the generation of new energy, which plays a role in smoothing the output of new energy and suppressing the fluctuation of electric power. At the same time, it can also serve as a buffer between the gravity energy storage system and the AC power grid to optimize the storage and release process of electricity. The gravity energy storage system releases the stored electricity to the power grid during the peak period of power consumption in the power grid, which plays a role in peak shaving and valley filling. In addition, when the power grid cannot absorb the new energy generation due to failures and other reasons, the gravity energy storage system can receive this electricity together with the electrochemical energy storage system to avoid energy waste.

[0058] In an alternative embodiment, see Figure 3 As shown, Figure 3 A structural schematic diagram of a third hybrid energy storage system provided in Embodiment 1 of the present invention is shown, wherein the hybrid energy storage system includes a DC bus 105, a grid-connected inverter 106 and a transformer 107; the grid-connected inverter and the gravity energy storage system are connected via the DC bus through the transformer; the grid-connected inverter is used to convert the electric energy output by the gravity energy storage system from DC to AC, and output it to the transformer; the transformer is used to connect the AC power grid to the grid.

[0059] Specifically, the DC bus connects the grid-connected inverter, gravity energy storage system, and electrochemical energy storage system. The grid-connected inverter is a key device that connects the DC bus and the AC power grid. It converts the DC power output by the gravity energy storage system into AC power to meet the power demand of the AC power grid. The transformer is responsible for converting the voltage level of the AC power output by the grid-connected inverter to match the voltage requirements of the AC power grid. Through the adjustment of the transformer, it can be ensured that the power output by the hybrid energy storage system can be safely and stably connected to the power grid, providing reliable power support for the power grid.

[0060] During the operation of the hybrid energy storage system, the gravity energy storage system first transmits the stored electric energy to the grid-connected inverter through the DC bus. The grid-connected inverter converts this DC electric energy into AC electric energy, and transforms the voltage level through the transformer, and finally integrates the AC electric energy that meets the grid requirements into the grid. At the same time, the system can also flexibly adjust the output and storage of electric energy according to the needs of the grid and the status of the energy storage system to achieve efficient utilization of energy and stable operation of the grid.

[0061] In an alternative embodiment, see Figure 4 As shown, Figure 4 A structural schematic diagram of a fourth hybrid energy storage system provided in Embodiment 1 of the present invention is shown, wherein the hybrid energy storage system further includes a first DC transformer 108 and a first wind power converter 109, one end of the first DC transformer is connected to the photovoltaic power generation system, and the other end is respectively connected to the gravity energy storage system, the wind power generation system, and the AC power grid through the DC bus; one end of the first wind power converter is connected to the wind power generation system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, and the AC power grid through the DC bus; the first DC transformer is used to perform voltage conversion on the electric energy output by the photovoltaic power generation system; the first wind power converter is used to perform voltage conversion on the electric energy output by the wind power generation system.

[0062] Specifically, the system structure is a DC collection type hybrid energy storage system, which includes a first DC transformer and a first wind power converter. The first DC transformer is an important device for connecting the photovoltaic power generation system and the DC bus. Since the electric energy generated by the photovoltaic power generation system is usually DC power, but its voltage level may not match the requirements of the DC bus, the first DC transformer is set to convert the voltage of the electric energy output by the photovoltaic power generation system and adjust it to a voltage range suitable for DC bus transmission, so that the electric energy generated by the photovoltaic power generation system can be efficiently transmitted to the gravity energy storage system, the electrochemical energy storage system and the AC power grid through the DC bus, realizing the flexible distribution and utilization of electric energy.

[0063] The first wind power converter is a key component that connects the wind power generation system and the DC bus. Since the electricity generated by the wind power generation system is usually AC power, in this hybrid energy storage system, the DC bus is used as the hub of power transmission. Therefore, the first wind power converter is required to convert the AC power output by the wind power generation system into DC power, and transmit it to other parts of the system through the DC bus, so that the wind power generation system can also be seamlessly integrated with the photovoltaic power generation system and the gravity energy storage system to jointly provide stable power support for the AC power grid.

[0064] In an alternative embodiment, see Figure 5 As shown, Figure 5A structural schematic diagram of the fifth hybrid energy storage system provided in Example 1 of the present invention is shown, wherein the hybrid energy storage system also includes a second DC transformer 110; one end of the second DC transformer is connected to the electrochemical energy storage system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the DC bus; the second DC transformer is used to convert the voltage of the electric energy output / input of the electrochemical energy storage system.

[0065] Specifically, one end of the second DC transformer is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system and the AC power grid through a DC bus. This connection method enables the electrochemical energy storage system to exchange electrical energy with other components. Whether it is receiving electrical energy from other energy systems for storage or outputting electrical energy to the power grid or other systems, efficient voltage conversion can be performed through the second DC transformer.

[0066] When the electrochemical energy storage system needs to receive electric energy from the photovoltaic power generation system or the wind power generation system for storage, the second DC transformer can adjust the input electric energy to a voltage range suitable for storage by the electrochemical energy storage system. Similarly, when the electrochemical energy storage system needs to output electric energy to the gravity energy storage system or the AC power grid, the second DC transformer can also convert the output electric energy into a voltage to meet the requirements of the receiving end.

[0067] In order to facilitate the understanding of the working principle of the DC-type hybrid energy storage system, see Figure 6 As shown, Figure 6The schematic diagram of the structure of a DC-collection hybrid energy storage system provided by the first embodiment of the present invention is shown, wherein in the DC-collection hybrid energy storage system, heavy object placement areas are respectively arranged on the top floor and the bottom floor of the building, and multiple heavy object lifting channels are arranged on one side of the building, and a heavy object cabin is arranged in the lifting channel to handle the heavy objects. A transmission wheel is placed below or above the lifting channel, and the transmission wheel is mechanically connected to the motor through a shaft system, and the motor has an electric function and a power generation function. The motor is connected to the frequency converter, and the frequency converter controls the drive of the motor to realize the power generation and electric function. The frequency converter is connected to the motor through a three-phase alternating current connection. The frequency converter is connected to the DC transformer through positive and negative DC. The DC transformer realizes the conversion of low-voltage DC to medium-voltage or high-voltage DC voltage and the transmission of electric energy. A plurality of upgrade channels are arranged in the system, and each upgrade channel corresponds to a group of transmission wheels, shaft systems, motors, frequency converters and DC transformer devices. Multiple medium-voltage or high-voltage DC power is collected on the DC bus. Then, the conversion of DC to AC is realized through a grid-connected inverter, and the grid connection of electric energy is realized through a power transformer. Connect a DC transformer for an electrochemical energy storage system to a medium-voltage or high-voltage DC bus to achieve conversion from medium-voltage or high-voltage DC to low-voltage DC, and arrange an electrochemical energy storage system connected to the DC transformer through a low-voltage DC bus. Connect a DC transformer for a photovoltaic new energy power generation system to a medium-voltage or high-voltage DC bus to achieve conversion from medium-voltage or high-voltage DC to low-voltage DC, and arrange a photovoltaic power generation system connected to the DC transformer through a low-voltage DC bus to achieve photovoltaic new energy power generation. Connect a wind power converter for a wind power new energy power generation system to a medium-voltage or high-voltage DC bus to achieve conversion from wind power new energy to medium-voltage or high-voltage DC, and arrange a wind power generation system connected to a medium-voltage or high-voltage DC bus through a wind power converter to achieve wind power new energy power generation.

[0068] In an alternative embodiment, see Figure 7 As shown, Figure 7 A structural schematic diagram of the sixth hybrid energy storage system provided in the first embodiment of the present invention is shown, wherein the hybrid energy storage system further includes an AC busbar 111, a photovoltaic inverter 112 and a second wind power converter 113, one end of the photovoltaic inverter is connected to the photovoltaic power generation system, and the other end is connected to the gravity energy storage system, the wind power generation system and the AC power grid through the AC busbar; one end of the second wind power converter is connected to the wind power generation system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system and the AC power grid through the DC busbar; the photovoltaic inverter is used to convert the electric energy output by the photovoltaic power generation system from DC to AC; the second wind power converter is used to convert the electric energy output by the wind power generation system from DC to AC.

[0069] Specifically, the system structure is an AC collection type hybrid energy storage system. One end of the photovoltaic inverter is closely connected to the photovoltaic power generation system. It is responsible for receiving the DC power converted by the photovoltaic panels and efficiently converting this DC power into AC power to meet the power supply needs of the AC power grid or supply other loads that require AC power. The converted AC power is then transmitted through the AC collection bus. As the hub of power transmission, the AC collection bus connects the AC power output by the photovoltaic inverter with other components in the system. The wind power generation system converts the DC power (or rectified DC power) generated by the wind power generation system into AC power through the second wind power converter and transmits it through the AC collection bus.

[0070] In an alternative embodiment, see Figure 8 As shown, Figure 8 A structural schematic diagram of the seventh hybrid energy storage system provided in Example 1 of the present invention is shown, wherein the hybrid energy storage system also includes an energy storage inverter 114; one end of the energy storage inverter is connected to the electrochemical energy storage system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the AC bus; the energy storage inverter is used to convert the electric energy output by the electrochemical energy storage system from direct current to alternating current, or to convert the electric energy received by the electrochemical energy storage system through the AC bus from alternating current to direct current.

[0071] Specifically, the energy storage converter acts as a bridge between the electrochemical energy storage system and other system components, playing an important role in the bidirectional conversion of electric energy. One end of the converter is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, photovoltaic power generation system, wind power generation system and AC power grid through the AC bus.

[0072] When the electrochemical energy storage system needs to release electric energy to the external system, the energy storage converter will efficiently convert the DC power stored in the electrochemical energy storage system into AC power. The converted AC power is then transmitted to the gravity energy storage system or AC power grid through the AC bus to meet the power supply needs of the power grid or supply other loads that require AC power.

[0073] On the contrary, when an external system (such as a gravity energy storage system, a photovoltaic power generation system, or a wind power generation system in excess of electricity) needs to charge the electrochemical energy storage system, the energy storage inverter plays a reverse conversion role, converting the AC power received through the AC bus into DC power, and then storing it in the electrochemical energy storage system. This bidirectional conversion capability enables the electrochemical energy storage system to flexibly store and release electrical energy in the system, thereby improving the energy utilization efficiency and response speed of the entire hybrid energy storage system.

[0074] In order to facilitate the understanding of the working principle of the AC-type hybrid energy storage system, see Fig. 9 As shown, Fig. 9 A structural schematic diagram of an AC-collection hybrid energy storage system provided by an embodiment of the present invention is shown, wherein in the AC-collection hybrid energy storage system, heavy object placement areas are respectively arranged on the top floor and the bottom floor of the building, and a plurality of heavy object lifting passages are arranged on one side of the building, and a heavy object cabin is arranged in the lifting passage to be responsible for the transportation of heavy objects. A transmission wheel is placed below or above the lifting passage, and the transmission wheel is mechanically connected to the motor through a shaft system, and the motor has an electric function and a power generation function. The motor is connected to the frequency converter, and the frequency converter controls the drive of the motor to realize the power generation and electric functions. The frequency converter is connected to the motor through a three-phase AC connection. The frequency converter is connected to the grid-connected inverter through positive and negative DC. The grid-connected inverter realizes the conversion of DC to three-phase AC and the transmission of electric energy. A plurality of lifting passages are arranged in the system, and each lifting passage corresponds to a group of transmission wheels, shaft systems, motors, frequency converters and grid-connected inverter devices, and the grid-connected inverter is connected to the AC collection bus. Connect an energy storage converter for an electrochemical energy storage system to the AC busbar to achieve the conversion of the battery DC point to low-voltage AC power, and arrange an electrochemical energy storage battery system connected to the AC busbar through the energy storage converter. Connect a photovoltaic inverter for a photovoltaic new energy power generation system to the AC busbar to achieve the conversion of photovoltaic battery DC power to the AC busbar, and arrange a photovoltaic power generation system connected to the AC busbar through the photovoltaic inverter to achieve photovoltaic new energy power generation. Connect a wind power converter for a wind power new energy power generation system to the AC busbar to achieve the conversion of wind power new energy to AC busbar power, and arrange a wind power generation system connected to the AC busbar through the wind power converter to achieve wind power new energy power generation.

[0075] Embodiment 2

[0076] Embodiment 2 of the present invention provides a hybrid energy storage method, which is applied to a hybrid energy storage system, wherein the hybrid energy storage system includes a gravity energy storage system, a photovoltaic power generation system, and a wind power generation system; the gravity energy storage system, the photovoltaic power generation system, and the wind power generation system are all connected to an AC power grid; the method includes:

[0077] The photovoltaic power generation system and the wind power generation system output electric energy to the AC power grid and / or the gravity energy storage system;

[0078] The gravity energy storage system outputs electrical energy to the AC power grid.

[0079] In an optional embodiment, the hybrid energy storage system includes an electrochemical energy storage system; the electrochemical energy storage system is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid; the method includes:

[0080] The photovoltaic power generation system and the wind power generation system output electric energy to the electrochemical energy storage system; the electrochemical energy storage system stores electric energy and also outputs electric energy to the gravity energy storage system.

[0081] In an optional embodiment, the hybrid energy storage system includes a DC bus, a grid-connected inverter and a transformer; the grid-connected inverter and the gravity energy storage system are connected via the DC bus through the transformer; the method includes:

[0082] The grid-connected inverter converts the electric energy output by the gravity energy storage system from direct current into alternating current, and outputs it to the transformer; the transformer connects the electric energy to the alternating current grid.

[0083] In an optional embodiment, the hybrid energy storage system further includes a first DC transformer and a first wind power converter, one end of the first DC transformer is connected to the photovoltaic power generation system, and the other end is respectively connected to the gravity energy storage system, the wind power generation system, and the AC power grid through the DC bus; one end of the first wind power converter is connected to the wind power generation system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, and the AC power grid through the DC bus; the method includes:

[0084] The first DC transformer performs voltage conversion on the electric energy output by the photovoltaic power generation system; and the first wind power converter performs voltage conversion on the electric energy output by the wind power generation system.

[0085] In an optional embodiment, the hybrid energy storage system further includes a second DC transformer; one end of the second DC transformer is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the DC bus; the method includes:

[0086] The second DC transformer performs voltage conversion on the electric energy output / input of the electrochemical energy storage system.

[0087] In an optional embodiment, the hybrid energy storage system further includes an AC busbar, a photovoltaic inverter and a second wind power converter, one end of the photovoltaic inverter is connected to the photovoltaic power generation system, and the other end is connected to the gravity energy storage system, the wind power generation system and the AC power grid through the AC busbar; one end of the second wind power converter is connected to the wind power generation system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system and the AC power grid through the DC busbar; the method includes:

[0088] The photovoltaic inverter converts the electric energy output by the photovoltaic power generation system from direct current to alternating current; the second wind power converter converts the electric energy output by the wind power generation system from direct current to alternating current.

[0089] In an optional embodiment, the hybrid energy storage system further includes an energy storage converter; one end of the energy storage converter is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the AC busbar; the method includes:

[0090] The energy storage converter converts the electric energy output by the electrochemical energy storage system from direct current to alternating current, or converts the electric energy received by the electrochemical energy storage system through the alternating current bus from alternating current to direct current.

[0091] Embodiment 3

[0092] Based on the same application concept, see Fig.10 As shown, Fig.10 FIG. 4 shows a schematic diagram of the structure of a computer device provided by Embodiment 3 of the present invention, wherein: Fig.10 As shown, a computer device 1000 provided in Embodiment 3 of the present application includes:

[0093] A processor 1001, a memory 1002 and a bus 1003, wherein the memory 1002 stores machine-readable instructions executable by the processor 1001. When the computer device 1000 is running, the processor 1001 communicates with the memory 1002 via the bus 1003. When the processor 1001 is running, the machine-readable instructions execute the steps of the hybrid energy storage method shown in the above-mentioned embodiment 2.

[0094] Embodiment 4

[0095] Based on the same application concept, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the hybrid energy storage method described in any one of the above embodiments are executed.

[0096] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0097] The computer program product for hybrid energy storage provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0098] The hybrid energy storage system provided in the embodiment of the present invention can be specific hardware on the device or software or firmware installed on the device. The system provided in the embodiment of the present invention has the same implementation principle and technical effects as the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the system embodiment, reference can be made to the corresponding contents in the aforementioned method embodiment. Technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can all refer to the corresponding processes in the aforementioned method embodiment, and will not be repeated here.

[0099] In the embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. The system embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some communication interface, device or unit, which can be electrical, mechanical or other forms.

[0100] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0101] In addition, each functional unit in the embodiment provided by the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0102] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0103] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0104] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A hybrid energy storage system, characterized in that: The hybrid energy storage system includes a gravity energy storage system, a photovoltaic power generation system and a wind power generation system; the gravity energy storage system, the photovoltaic power generation system and the wind power generation system are all connected to an AC power grid; The photovoltaic power generation system and the wind power generation system are used to output electric energy to the AC power grid and / or the gravity energy storage system; the gravity energy storage system is used to output electric energy to the AC power grid.

2. The hybrid energy storage system according to claim 1, characterized in that: The hybrid energy storage system includes an electrochemical energy storage system; the electrochemical energy storage system is respectively connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid; The photovoltaic power generation system and the wind power generation system are used to output electric energy to the electrochemical energy storage system; the electrochemical energy storage system is used to store electric energy and also to output electric energy to the gravity energy storage system.

3. The hybrid energy storage system according to claim 2, characterized in that: The hybrid energy storage system comprises a DC bus, a grid-connected inverter and a transformer; the grid-connected inverter and the gravity energy storage system are connected via the DC bus through the transformer; The grid-connected inverter is used to convert the electric energy output by the gravity energy storage system from direct current to alternating current, and output it to the transformer; the transformer is used to connect the electric energy to the alternating current grid.

4. The hybrid energy storage system according to claim 3, characterized in that: The hybrid energy storage system further includes a first DC transformer and a first wind power converter, wherein one end of the first DC transformer is connected to the photovoltaic power generation system, and the other end is respectively connected to the gravity energy storage system, the wind power generation system, and the AC power grid through the DC bus; one end of the first wind power converter is connected to the wind power generation system, and the other end is respectively connected to the gravity energy storage system, the photovoltaic power generation system, and the AC power grid through the DC bus; The first DC transformer is used for performing voltage conversion on the electric energy output by the photovoltaic power generation system; and the first wind power converter is used for performing voltage conversion on the electric energy output by the wind power generation system.

5. The hybrid energy storage system according to claim 4, characterized in that: The hybrid energy storage system also includes a second DC transformer; one end of the second DC transformer is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the DC bus; The second DC transformer is used to perform voltage conversion on the electric energy output / input of the electrochemical energy storage system.

6. The hybrid energy storage system according to claim 3, characterized in that: The hybrid energy storage system also includes an AC collection bus, a photovoltaic inverter and a second wind power converter, one end of the photovoltaic inverter is connected to the photovoltaic power generation system, and the other end is connected to the gravity energy storage system, the wind power generation system and the AC power grid through the AC collection bus; one end of the second wind power converter is connected to the wind power generation system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system and the AC power grid through the DC bus; The photovoltaic inverter is used to convert the electric energy output by the photovoltaic power generation system from direct current to alternating current; the second wind power converter is used to convert the electric energy output by the wind power generation system from direct current to alternating current.

7. The hybrid energy storage system according to claim 6, characterized in that: The hybrid energy storage system also includes an energy storage converter; one end of the energy storage converter is connected to the electrochemical energy storage system, and the other end is connected to the gravity energy storage system, the photovoltaic power generation system, the wind power generation system, and the AC power grid through the AC collection bus; The energy storage converter is used to convert the electric energy output by the electrochemical energy storage system from direct current to alternating current, or to convert the electric energy received by the electrochemical energy storage system through the alternating current bus from alternating current to direct current.

8. A hybrid energy storage method, characterized in that: Applied to a hybrid energy storage system, the hybrid energy storage system includes a gravity energy storage system, a photovoltaic power generation system and a wind power generation system; the gravity energy storage system, the photovoltaic power generation system and the wind power generation system are all connected to an AC power grid; the method includes: The photovoltaic power generation system and the wind power generation system output electric energy to the AC power grid and / or the gravity energy storage system; The gravity energy storage system outputs electrical energy to the AC power grid.

9. A computer device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of the hybrid energy storage method as described in claim 8 are performed.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a processor, executes the steps of the hybrid energy storage method as claimed in claim 8.

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