Dual-carbon intelligent micro-grid management system and control method thereof
By designing a dual-carbon intelligent microgrid management system, using components such as central controller and BMS modules, the rapid control and regulation of various power supplies and energy storage of the microgrid is achieved, and the stability and economical problems of the power supply of the microgrid in different operating modes is solved, and efficient and reliable power management is achieved.
Patent Information
- Application Number
- CN202411807464.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-03-14
AI Technical Summary
The prior art is difficult to effectively manage and optimize the power supply of microgrids in different operating modes, especially in providing stable and safe power supply for power.
A dual-carbon intelligent microgrid management system is designed, including wind power generation system, photovoltaic power generation system, energy storage system and microgrid gateway interface cabinet. Through components such as central controller units and BMS modules, rapid control and adjustment of various power supplies and energy storage in the microgrid are achieved, and control strategies from grid-connected mode to grid-connected mode and grid-connected mode to grid-connected mode are adopted to ensure the stability and economicality of power supply.
The smooth switching of the microgrid between different operating modes is achieved, ensuring the stability and reliability of power supply, and at the same time, economically optimized power management is achieved by optimizing the output of photovoltaic, wind power generation and energy storage systems.
Smart Images
Figure CN119628061A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power grid technology, and in particular to a dual-carbon intelligent microgrid management system and a control method thereof. Background Art
[0002] my country is accelerating the process of clean energy transformation, and the demand for decarbonization and emission reduction is growing. In order to achieve large-scale low-carbon or even carbon-free energy and return to the ecological balance of the earth, my country has proposed the goals of "carbon peak" and "carbon neutrality". Renewable energy such as wind power and photovoltaics will usher in explosive growth, and renewable energy will gradually replace traditional fossil energy to occupy a dominant position in the energy field.
[0003] As a kind of energy with great development potential in the future energy sector, hydrogen energy is considered to be the "ultimate energy" of the 21st century due to its high calorific value, diverse sources, abundant reserves, and suitability for large-capacity and long-term storage. It also provides a new idea for large-scale energy storage technology. my country has proposed to accelerate the development of industrial chain technology and equipment such as hydrogen production, storage, and use, vigorously promote the large-scale demonstration of energy storage systems, and improve and implement the renewable energy power consumption mechanism.
[0004] In recent years, domestic scholars have begun to study the technology of wind-solar hybrid coupled power generation and hydrogen production, and have begun to explore the feasibility of realizing multi-energy coupled hydrogen production systems with more renewable energy. In 2017, Yang Weihua and others optimized the design of wind-solar hybrid power generation and energy storage systems under different application scales, and proposed that the utilization rate of wind and solar resources can be maximized by combining the climate environment of the system construction site and considering the parameter characteristics of wind turbines and photovoltaic panels to reasonably allocate capacity; in 2018, Jiang Kangle proposed an environmental benefit evaluation method for wind-solar hybrid combined hydrogen production systems, and believed that the utilization of wind-solar hybrid combined hydrogen production systems in different regions has different emphasis on light and wind resource curves; in 2019, Chen Jianming and others analyzed the feasibility of using hydrogen energy storage technology to solve the problem of wind and solar abandonment in energy development, and proposed that renewable energy hydrogen production and storage technology can avoid energy waste to the greatest extent. Relevant research in the field of wind-solar hybrid hydrogen production system technology has greatly promoted my country's energy clean transformation and decarbonization and emission reduction process. Overall, multi-energy complementary coupling of power generation and hydrogen production will be the future trend in the field of hydrogen energy storage. Relevant scholars should conduct in-depth research, explore and promote lower-cost wind-solar complementary hydrogen production technology, promote my country's energy transformation process, and ensure national energy security.
[0005] Photovoltaic hydrogen production combines wind power, photovoltaics, intelligent power distribution, microgrids, hydrogen production, energy storage systems, and power supply systems to achieve self-sufficiency and sustainable use of energy, without generating surplus electricity, and providing high-quality power quality power supply to the user side. Among them, the most important technology is to provide stable and safe power quality power supply for hydrogen production. A dual-carbon intelligent microgrid management system and its control scheme are designed. The proportions of photovoltaics, intelligent power distribution, and energy storage are designed according to the power load of hydrogen production, and the best reasonable economic plan is issued to provide high-quality and stable power supply for hydrogen production. Summary of the invention
[0006] A dual-carbon intelligent microgrid management system, including: a wind power generation system, a photovoltaic power generation system, an energy storage system, and a microgrid gateway interface cabinet; The wind power generation system comprises: a unit controller, an inverter, a microgrid protection module and a fast measurement and control module; the inverter is connected to the AC bus; The photovoltaic power generation system includes an inverter, a microgrid protection module and a fast measurement and control module; the inverter is connected to the AC bus; The energy storage system includes a BMS module, a stability controller, an energy storage inverter, a microgrid protection module and a fast measurement and control module; the stability controller is connected to the AC bus; The microgrid gateway interface cabinet is provided with a PCC fast switch, a microgrid protection module, a central controller unit, a synchronous grid-connected device, a fast measurement and control module and a communication controller; the communication controller is connected to the AC bus; the microgrid gateway interface cabinet is connected to the public power grid through the PCC fast switch.
[0007] Specifically, the BMS module includes: a battery module management main control unit (BCMU), a collection and balancing module (CABU), a management system data display module, an insulation detection module, and a high-voltage control box.
[0008] Specifically, the central controller unit includes: a power module, an FPGA module, an Ethernet module, and an RS485 module.
[0009] A dual-carbon smart microgrid management and control method: S1: Power generation prediction, basic mathematical model of components; S2: Adjust the output of photovoltaic power generation system, wind power generation system and energy storage system; S3: Adopt the control strategy of switching from grid-connected mode to isolated grid mode; S4: Adopt the control strategy of switching from isolated grid mode to grid-connected mode.
[0010] Specifically, in step S1, the objective function is: in: ; In the above: Expressed as The decision variables at the moment; G is the sum of controllable distributed power sources; B is a collection of energy storage devices; The superscript is " " indicates the original planned setting value; express Distributed power supply Active power generated; Represents controllable distributed power source operating costs; Distributed power supply The cost of electricity generation; For distributed power Unit maintenance costs; for Time battery The active power generated; Indicates battery maintenance costs; For batteries Unit maintenance costs; and They are Buying and selling electric power from the grid at all times; and They are Buy and sell electricity prices from the grid at all times; Indicates the cost of buying and selling electricity from the power grid; represents penalty fees; for the punishment system; and They are Distributed power supply and batteries The original planned setting value.
[0011] Beneficial effects of the present invention: The power supply can be switched without interruption when the microgrid operates in different modes, thus improving the reliability of the power supply of the system.
[0012] A microgrid control technology based on a high-speed real-time Ethernet microgrid control unit is proposed. Through the rapid acquisition of electrical parameters of the entire microgrid and the rapid control of each power source and energy storage in the microgrid, the stable operation of the microgrid is achieved, and the economic optimization operation of the microgrid is also achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 Schematic diagram of the dual-carbon smart microgrid management system of the present invention.
[0014] Figure 2 It is a flow chart of the dual-carbon smart microgrid management and control method of the present invention. DETAILED DESCRIPTION
[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example
[0016] A dual-carbon intelligent microgrid management system, including: a wind power generation system, a photovoltaic power generation system, an energy storage system, and a microgrid gateway interface cabinet; like Figure 1 As shown, the wind power generation system includes: a unit controller, an inverter, a microgrid protection module and a fast measurement and control module; the inverter is connected to the AC bus; The photovoltaic power generation system includes an inverter, a microgrid protection module and a fast measurement and control module; the inverter is connected to the AC bus; The energy storage system includes a BMS module, a stability controller, an energy storage inverter, a microgrid protection module and a fast measurement and control module; the stability controller is connected to the AC bus; The microgrid gateway interface cabinet is provided with a PCC fast switch, a microgrid protection module, a central controller unit, a synchronous grid-connected device, a fast measurement and control module and a communication controller; the communication controller is connected to the AC bus; the microgrid gateway interface cabinet is connected to the public grid through the PCC fast switch; the microgrid gateway interface cabinet completes the functions of microgrid stability control, connection and isolation with the public grid, etc., to ensure the stable operation of the microgrid and the smooth interface with the large grid.
[0017] Furthermore, the BMS module includes: a battery module management main control unit (BCMU), a collection and balancing module (CABU), a management system data display module, an insulation detection module, and a high-voltage control box; the battery module management main control unit (BCMU) includes the following main functions: SOC estimation, current detection, communication function, alarm and protection, replacement management, system expansion, data storage, insulation detection, and system self-test; the collection and balancing module (CABU) includes the following main functions: single cell voltage detection, single cell balancing, temperature detection, current acquisition, fan management, heating management, power supply and CAN communication interface; the insulation detection module includes the following main functions: total current detection, leakage current detection and battery positive and negative bus total voltage detection, etc., and can be uploaded to the main controller in real time through the CAN port.
[0018] Furthermore, the central controller unit includes: a power module, an FPGA module, an Ethernet module, and an RS485 module; the Ethernet module can receive and send 100Mbit / s Ethernet data, and the Ethernet frame is input into the Ethernet module from the RJ45 port, and after a series of conversions in the Ethernet module, it is input into the FPGA unit. The RS485 module uses a high-speed 485 protocol chip, which is connected to the FPGA through a serial port to convert the serial data output by the FPGA into a standard 485 signal. Example
[0019] The energy storage inverter is used as the standard source of the system. By controlling the charging and discharging of energy storage, the instantaneous power fluctuation of the microgrid is smoothed, and the AC bus voltage and frequency of the microgrid network are kept stable. The central controller unit maintains the stable operation of the microgrid by adjusting the output of photovoltaic power generation, wind power generation, and energy storage, and controlling the switching of loads.
[0020] A dual-carbon smart microgrid management and control method: S1: Power Generation Forecast In the power generation dispatch of microgrids, power generation forecasts are generally made for renewable energy units and loads, and the planned output of each controllable unit is arranged on this basis. Since the power generation of renewable energy units depends on the natural environment, it is random and volatile, and there is a certain error between the actual output and the predicted output. In real-time dispatch, it is necessary to smooth the unbalanced power in the system in real time.
[0021] The basic mathematical model of the component is as follows, where the objective function is: in: ; In the above: Expressed as The decision variables at the moment; It is a combination of controllable distributed power sources; A collection of energy storage devices; The superscript is " " indicates the original planned setting value; express Distributed power supply Active power generated; Represents controllable distributed power source operating costs; Distributed power supply The cost of electricity generation; For distributed power Unit maintenance costs; for Time battery The active power generated; Indicates battery maintenance costs; For batteries Unit maintenance costs; and They are Buying and selling electric power from the grid at all times; and They are Buy and sell electricity prices from the grid at all times; Indicates the cost of buying and selling electricity from the power grid; represents penalty fees; is the penalty coefficient; and They are Distributed power supply and batteries The original planned setting value.
[0022] S2: Adjust the output of photovoltaic power generation system, wind power generation system and energy storage system to achieve optimal operation of the system; Microgrid isolated network control strategy In the isolated network state, according to the control strategy of the microgrid, it is generally divided into master-slave control and peer control. Among them, the master-slave control uses a controllable micro source as the voltage-frequency control unit, which adopts V / f control as the reference voltage and frequency of the system, responsible for absorbing the unbalanced power in the microgrid. The remaining microgrid sources adopt PQ control to accept the dispatching instructions of the energy management system. Peer control shares the system voltage and frequency according to the droop characteristic curve of the inverter, and can jointly share the unbalanced power in the microgrid. Each distributed power source is used to dynamically balance the power through the droop characteristics of the inverter.
[0023] S3: Adopt the control strategy of switching from grid-connected mode to isolated grid mode. When the grid-connected mode is switched to isolated grid operation mode, the PCC fast switch is disconnected, and at the same time, the energy storage inverter issues an isolated grid switching command through the auxiliary contact. The energy storage inverter instantly switches to isolated grid operation mode, switches to PV control, and instantly compensates for the power exchanged between the microgrid and the public grid in the grid-connected operation mode to maintain the instantaneous power balance of the microgrid. The central controller adjusts the output of the photovoltaic power generation system, wind power generation system, and energy storage system, and the energy storage inverter is at the optimal working point to maintain the stability margin of the system, and the microgrid switches to isolated grid operation mode.
[0024] S4: Adopt the control strategy of switching from isolated grid mode to grid-connected mode. When the isolated grid mode is switched to the grid-connected operation mode, the energy storage inverter receives the switching command from isolated grid mode to grid-connected mode, detects the voltage at the upper and lower ports of the PCC fast switch, drives the microgrid to achieve phase synchronization with the public grid, reaches the synchronization point, and sends a synchronous grid-connected closing command to the PCC fast switch. The PCC fast switch is closed, and the microgrid is synchronously connected to the grid, and the microgrid is switched to the grid-connected operation mode.
[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A dual-carbon smart microgrid management system, comprising: Wind power generation system, photovoltaic power generation system, energy storage system, microgrid gateway interface cabinet; The characteristics are as follows: the wind power generation system comprises: a unit controller, an inverter, a microgrid protection module and a fast measurement and control module; the inverter is connected to the AC bus; The photovoltaic power generation system includes an inverter, a microgrid protection module and a fast measurement and control module; the inverter is connected to the AC bus; The energy storage system includes a BMS module, a stability controller, an energy storage inverter, a microgrid protection module and a fast measurement and control module; the stability controller is connected to the AC bus; The microgrid gateway interface cabinet is provided with a PCC fast switch, a microgrid protection module, a central controller unit, a synchronous grid-connected device, a fast measurement and control module and a communication controller; the communication controller is connected to the AC bus; the microgrid gateway interface cabinet is connected to the public power grid through the PCC fast switch.
2. A dual-carbon intelligent microgrid management system according to claim 1, characterized in that: The BMS module includes: a battery module management main control unit (BCMU), a collection and balancing module (CABU), a management system data display module, an insulation detection module, and a high-voltage control box.
3. A dual-carbon intelligent microgrid management system according to claim 1, characterized in that: The central controller unit includes: a power module, an FPGA module, an Ethernet module, and an RS485 module.
4. According to a dual-carbon smart microgrid management system according to claims 1-3, its control method is: S1: Power generation prediction, basic mathematical model of components; S2: Adjust the output of photovoltaic power generation system, wind power generation system and energy storage system; S3: Adopt the control strategy of switching from grid-connected mode to isolated grid mode; S4: Adopt the control strategy of switching from isolated grid mode to grid-connected mode.
5. A dual-carbon smart microgrid management and control method according to claim 4, characterized in that: In step S1, the objective function is: in: ; In the above formula: Expressed as The decision variables at the moment; G is the sum of controllable distributed power sources; B is a collection of energy storage devices; The superscript is " " indicates the original planned setting value; express Distributed power supply Active power generated; Represents controllable distributed power source operating costs; Distributed power supply The cost of electricity generation; For distributed power Unit maintenance costs; for Time battery The active power generated; Indicates battery maintenance costs; For batteries Unit maintenance costs; and They are Buying and selling electric power from the grid at all times; and They are Buy and sell electricity prices from the grid at all times; Indicates the cost of purchasing and selling electricity from the power grid; represents penalty fees; for the punishment system; and They are Distributed power supply and batteries The original planned setting value.