A new energy storage system applied to a microgrid

Abstract

The application discloses a new energy storage system applied to a micro-grid, which comprises a new energy power generation module, a power load threshold setting module, a load monitoring module and a power transmission module, wherein the new energy power generation module is used for generating power based on new energy; the power load threshold setting module is used for setting a power load threshold based on historical power load data of users to be powered; the load monitoring module is used for monitoring real-time power load of the users to be powered, and if there is a user to be powered with real-time power load exceeding the power load threshold, the position of the current user to be powered is acquired; the power transmission module is used for transmitting power to the position of the current user to be powered; and the energy storage module is used for storing power when there is no power load position in the power grid. The application improves the prediction accuracy of power load scenarios of users and the power supply efficiency, realizes timely storage of power when there is no power load, realizes a double-mode transmission mode, improves the intelligent degree of transmission, and greatly reduces the disturbance to the power grid and the influence on the power load of users.

Description

Technical Field

[0001] This invention belongs to the field of new energy storage, and in particular relates to a new energy storage system applied to microgrids. Background Technology

[0002] In the field of distributed energy and microgrids, the development of existing technologies and management is uneven. Although some research has been conducted in China in recent years in the fields of distributed energy, energy storage technology, and microgrids, the key technologies and comprehensive energy efficiency management levels of multi-energy complementary systems composed of photovoltaic power generation, combined solar power, natural gas, multi-element composite energy storage, and microgrids are relatively lagging behind. It is necessary to increase R&D investment, develop key technologies, improve the economic dispatch and optimized operation management level of integrated energy systems, and narrow the gap with developed countries as soon as possible.

[0003] A microgrid may contain various types of distributed energy sources and energy storage devices. Therefore, researching how to better integrate and coordinate these different types of distributed energy sources and energy storage devices is of great significance for improving the working efficiency and grid connection efficiency of microgrids. Summary of the Invention

[0004] The purpose of this invention is to provide a new energy storage system for microgrids to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides a new energy storage system for microgrids, comprising:

[0006] New energy power generation module, power load threshold setting module, load monitoring module, power transmission module and energy storage module;

[0007] The new energy power generation module is used for power generation based on new energy sources;

[0008] The power load threshold setting module is used to set the power load threshold based on the historical power load data and recent power load data of the users to be supplied with electricity;

[0009] The load monitoring module is used to monitor the real-time power load of users waiting to be supplied with power. If there are users waiting to be supplied with power whose real-time power load exceeds the power load threshold, the location of the current users waiting to be supplied with power will be obtained.

[0010] The power transmission module is used to transmit electrical energy to the location of the current user who needs power.

[0011] The energy storage module is used to store converted electrical energy when there is no electrical load location in the power grid.

[0012] Optionally, the new energy power generation module includes a power generation monitoring module, several photovoltaic power generation systems and several wind power generation systems arranged in a distributed manner;

[0013] The photovoltaic power generation system is used to collect solar energy and convert it into electrical energy;

[0014] The wind power generation system is used to collect wind energy and convert it into electrical energy.

[0015] Optionally, the power generation equipment monitoring module is used to monitor the real-time power generation and phased power generation of the photovoltaic power generation system and the wind power generation system respectively. The phased power generation includes daily power generation, weekly power generation, monthly power generation and annual power generation.

[0016] Optionally, the power load threshold setting module includes a historical data acquisition module, a threshold setting model construction and training module, and a threshold setting module;

[0017] The data acquisition module is used to collect historical power load data and recent power load data of users waiting for power supply.

[0018] The threshold setting model construction and training module is used to construct a threshold setting model and train the threshold setting model based on the historical power load data until the number of iterations reaches a predetermined number, at which point the training is completed and the trained threshold setting model is obtained.

[0019] The threshold setting module is used to input the recent power load data into the threshold setting model to obtain the power load threshold.

[0020] Optionally, the power load data within the previous 3 months to 1 month of the current date can be used as the historical power load data, and the power load data within the previous 1 month to the current date can be used as the recent load data.

[0021] Optionally, the load monitoring module includes a power load monitoring module and a user location acquisition module;

[0022] The power load monitoring module is used to monitor the real-time power load of users waiting for power supply, and compare the real-time power load with the power load threshold to determine whether it exceeds the power load threshold.

[0023] The pending power user location acquisition module is used to acquire the location of pending power users that exceed the power load threshold.

[0024] Optionally, the power delivery module includes a power converter and a delivery module;

[0025] The power converter is used to convert the voltage value of electrical energy and to convert the DC and AC states of electrical energy.

[0026] The transmission module is used to transmit converted electrical energy in a grid-connected or off-grid manner.

[0027] Optionally, the power converter includes a DC-DC converter and a bidirectional DC / AC converter;

[0028] The DC-DC converter is used to convert the voltage of electrical energy;

[0029] The DC / AC converter is used to convert electrical energy between DC and AC states.

[0030] Optionally, the conveying module includes a grid-connected conveying module and an off-grid conveying module;

[0031] The grid-connected transmission module is used to convert the voltage value based on the DC-DC converter, and then transmit the electrical energy to the grid through the bidirectional DC / AC converter. It is also used to store energy in the energy storage module through the DC-DC converter.

[0032] The off-grid transmission module is used to convert the voltage value based on the DC-DC converter, and then transmit the electrical energy to the location of the user to be powered through the bidirectional DC / AC converter. It is also used to store energy in the energy storage module through the DC-DC converter.

[0033] Optionally, the new energy storage system also includes an alarm module, which is used to issue an audible and visual alarm when the real-time power load exceeds the power load threshold.

[0034] The technical effects of this invention are as follows:

[0035] This invention features a simple structure and low cost. It acquires new energy sources through solar and wind power and converts them into electrical energy. A power load threshold setting module obtains the power load threshold of users in the region, improving the accuracy of predicting power load scenarios. A load monitoring module monitors users' real-time power load, improving the efficiency of timely power supply and enabling timely energy storage when there is no power load. A power transmission module enables dual-mode transmission, enhancing the intelligence of transmission and significantly reducing disturbances to the power grid and the impact on users' power load. Attached Figure Description

[0036] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0037] Figure 1 This is a schematic diagram of the system structure in an embodiment of the present invention. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0040] like Figure 1 As shown, this embodiment provides a new energy storage system for microgrids, including:

[0041] New energy power generation module, power load threshold setting module, load monitoring module, power transmission module and energy storage module;

[0042] The new energy power generation module is used for power generation based on new energy sources;

[0043] The power load threshold setting module is used to set power load thresholds based on historical and recent power load data of users to be supplied with electricity;

[0044] The load monitoring module is used to monitor the real-time power load of users waiting to be supplied with electricity. If there are users waiting to be supplied with electricity whose real-time power load exceeds the power load threshold, the location of the current users waiting to be supplied with electricity will be obtained.

[0045] The power transmission module is used to transmit electrical energy to the location of the user currently waiting for power.

[0046] Energy storage modules are used to store converted electrical energy when there is no electrical load in the power grid.

[0047] As one implementation method in this embodiment, the new energy power generation module includes a power generation monitoring module, several photovoltaic power generation systems and several wind power generation systems arranged in a distributed manner;

[0048] Photovoltaic power generation systems are used to collect solar energy and convert it into electrical energy;

[0049] Wind power systems are used to collect wind energy and convert it into electrical energy.

[0050] As one implementation method in this embodiment, the power generation equipment monitoring module is used to monitor the real-time power generation and phased power generation of the photovoltaic power generation system and the wind power generation system respectively. The phased power generation includes daily power generation, weekly power generation, monthly power generation and annual power generation.

[0051] As one implementation method in this embodiment, the power load threshold setting module includes a historical data acquisition module, a threshold setting model construction and training module, and a threshold setting module.

[0052] The data acquisition module is used to collect historical power load data and recent power load data of users waiting for electricity supply;

[0053] The threshold setting model construction and training module is used to construct a threshold setting model and train the threshold setting model based on historical power load data until the predetermined number of iterations is reached, at which point the training is completed and the trained threshold setting model is obtained.

[0054] The threshold setting module is used to input recent power load data into the threshold setting model to obtain the power load threshold.

[0055] As one implementation method in this embodiment, the power load data within the previous 3 months to 1 month is used as historical power load data, and the power load data within the previous 1 month to the current day is used as recent load data.

[0056] As one implementation method in this embodiment, the load monitoring module includes a power load monitoring module and a user location acquisition module;

[0057] The power load monitoring module is used to monitor the real-time power load of users waiting for power supply, and compare the real-time power load with the power load threshold to determine whether it exceeds the power load threshold.

[0058] The pending power user location acquisition module is used to acquire the location of pending power users that exceed the power load threshold.

[0059] As one embodiment of this invention, the power transmission module includes a power converter and a transmission module;

[0060] A power converter is used to convert the voltage value of electrical energy as well as its DC and AC states.

[0061] The transmission module is used to transmit converted electrical energy in a grid-connected or off-grid manner.

[0062] As one embodiment of this invention, the power converter includes a DC-DC converter and a bidirectional DC / AC converter;

[0063] DC-DC converters are used to convert the voltage of electrical energy;

[0064] DC / AC converters are used to convert electrical energy from DC to AC states.

[0065] As one implementation method in this embodiment, the conveying module includes a grid-connected conveying module and an off-grid conveying module;

[0066] The grid-connected transmission module is used to convert the voltage value based on the DC-DC converter, and then transmit the electrical energy to the grid through the bidirectional DC / AC converter. It is also used to store energy in the energy storage module through the DC-DC converter.

[0067] When the DC microgrid system is connected to the grid, the converter balances the DC bus voltage, enabling bidirectional flow of AC and DC energy.

[0068] The off-grid transmission module is used to convert voltage values ​​using a DC-DC converter, and then transmit electrical energy to the location of the user to be powered via a bidirectional DC / AC converter. It is also used to store energy in the energy storage module via a DC-DC converter.

[0069] As one implementation method in this embodiment, the new energy storage system also includes an alarm module, which is used to issue an audible and visual alarm when the real-time power load exceeds the power load threshold.

[0070] This DC-DC converter has a rated power of 10kW and adjustable output power, with a rated DC bus voltage of 700V. It features maximum power point tracking (MPPT) and constant voltage modes; conversion efficiency ≥95% and output current ripple ≤1%; operating temperature range -20℃ to +50℃; protection rating ≥IP20, meeting indoor installation requirements; noise ≤55dB; and protection functions including DC over / under voltage protection, DC overcurrent protection, short circuit protection, grounding protection, and reverse polarity protection. It can operate continuously at 1.05 times its rated capacity, for 10 minutes at 1.1 times its rated capacity, and for 1 minute at 1.2 times its rated capacity. It includes an RS485 interface or Ethernet interface and supports Modbus or Modbus / TCP communication protocols.

[0071] Main technical parameters of the system: Rated power: 20kVA; DC bus voltage: 700V; Efficiency: ≥95%; DC ripple: ≤1%; Voltage regulation accuracy: ≤±1%; Voltage and current harmonic distortion rate ≤5%; Operating environment conditions: Indoor ambient temperature -15℃~50℃, humidity ≤90%; Overload capacity: 1.05 times rated capacity for continuous operation, 1.1 times rated capacity for 10 minutes, 1.2 times rated capacity for 1 minute; AC side voltage: Three-phase four-wire 400V; Protection functions: Supports AC / DC over / under voltage protection, AC / DC overcurrent protection, short circuit protection, grounding protection, etc.; Communication method: With RS485 interface or Ethernet interface, supports Modbus or Modbus / TCP communication protocol, and the protocol is open for free.

[0072] This invention features a simple structure and low cost. It acquires new energy sources through solar and wind power and converts them into electrical energy. A power load threshold setting module obtains the power load threshold of users in the region, improving the accuracy of predicting power load scenarios. A load monitoring module monitors users' real-time power load, improving the efficiency of timely power supply and enabling timely energy storage when there is no power load. A power transmission module enables dual-mode transmission, enhancing the intelligence of transmission and significantly reducing disturbances to the power grid and the impact on users' power load.

[0073] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A new energy storage system for microgrids, characterized in that, include: New energy power generation module, power load threshold setting module, load monitoring module, power transmission module and energy storage module; The new energy power generation module is used for power generation based on new energy sources; The power load threshold setting module is used to set the power load threshold based on the historical power load data and recent power load data of the users to be supplied with electricity; The load monitoring module is used to monitor the real-time power load of users waiting to be supplied with power. If there are users waiting to be supplied with power whose real-time power load exceeds the power load threshold, the location of the current users waiting to be supplied with power will be obtained. The power transmission module is used to transmit electrical energy to the location of the current user who needs power. The energy storage module is used to store the converted electrical energy when there are no users to be supplied in the power grid. The power load threshold setting module includes a historical data acquisition module, a threshold setting model construction and training module, and a threshold setting module. The historical data acquisition module is used to collect historical power load data and recent power load data of users waiting for power supply. The threshold setting model construction and training module is used to construct a threshold setting model and train the threshold setting model based on the historical power load data until the number of iterations reaches a predetermined number, at which point the training is completed and the trained threshold setting model is obtained. The threshold setting module is used to input the recent power load data into the threshold setting model to obtain the power load threshold. The load monitoring module includes a power load monitoring module and a user location acquisition module; The power load monitoring module is used to monitor the real-time power load of users waiting for power supply, and compare the real-time power load with the power load threshold to determine whether it exceeds the power load threshold. The pending power user location acquisition module is used to acquire the location of pending power users that exceed the power load threshold; The power transmission module includes a power converter and a transmission module; The power converter is used to convert the voltage value of electrical energy and to convert the DC and AC states of electrical energy. The transmission module is used to transmit converted electrical energy in a grid-connected or off-grid manner; The power converter includes a DC-DC converter and a bidirectional DC / AC converter; The DC-DC converter is used to convert the voltage of electrical energy; The DC / AC converter is used to convert electrical energy between DC and AC states. The transmission module includes a grid-connected transmission module and an off-grid transmission module; The grid-connected transmission module is used to convert the voltage value based on the DC-DC converter, and then transmit the electrical energy to the grid through the bidirectional DC / AC converter. It is also used to store energy in the energy storage module through the DC-DC converter. The off-grid transmission module is used to convert the voltage value based on the DC-DC converter, and then transmit the electrical energy to the location of the user to be powered through the bidirectional DC / AC converter. It is also used to store energy in the energy storage module through the DC-DC converter.

2. The new energy storage system for microgrids according to claim 1, characterized in that, The new energy power generation module includes a power generation monitoring module, several photovoltaic power generation systems and several wind power generation systems arranged in a distributed manner; The photovoltaic power generation system is used to collect solar energy and convert it into electrical energy; The wind power generation system is used to collect wind energy and convert it into electrical energy.

3. The new energy storage system applied to microgrids according to claim 2, characterized in that, The power generation equipment monitoring module is used to monitor the real-time power generation and phased power generation of the photovoltaic power generation system and the wind power generation system respectively. The phased power generation includes daily power generation, weekly power generation, monthly power generation and annual power generation.

4. The new energy storage system applied to microgrids according to claim 1, characterized in that, The power load data within the previous 3 months to 1 month is used as the historical power load data, and the power load data within the previous 1 month to today is used as the recent power load data.

5. The new energy storage system applied to microgrids according to claim 1, characterized in that, The new energy storage system also includes an alarm module, which is used to issue an audible and visual alarm when the real-time power load exceeds the power load threshold.

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