Network construction type preassembled multi-electric-energy alternating current and direct current power distribution system and control method

Abstract

The invention relates to the technical field of power distribution control, in particular to a network construction type prefabricated multi-electric-energy alternating current and direct current power distribution system and a control method. By arranging the double-bus framework, the alternating-current bus bridge and the direct-current bus bridge are organically combined, and flexible conversion of alternating-current electric energy and direct-current electric energy is achieved; a hybrid power distribution network architecture is formed by adopting a network-forming bidirectional converter, and the limitation of single function of traditional power distribution equipment is broken through; by designing a multi-energy cooperative control device, unified allocation of equipment such as an energy storage converter and a photovoltaic inverter is realized; according to the invention, integration of equipment is realized, and adaptability and reliability of the system are improved through intelligent control; particularly, by means of a preassembled design and a standardized interface, the field installation and debugging cost is greatly reduced; through an electric energy mutual aid mechanism of AC and DC buses, the configuration capacity of energy storage equipment and the like is reduced, and meanwhile, the real-time electricity price difference is utilized to carry out optimal scheduling, so that the system operation cost is remarkably reduced.

Description

Technical Field

[0001] This application relates to the technical field of distribution control, and particularly to a network-constructing prefabricated multi-electric energy AC / DC distribution system and a control method thereof. Background Art

[0002] With the wide access of new types of loads such as new energy and electric vehicles, the distribution network is gradually transforming from the traditional unidirectional power supply mode to a two-way interactive mode. Under the multi-level framework of large power grids, active distribution networks, and microgrids, the distribution system needs to adapt to the characteristics of a new power system with integrated power generation and consumption and AC / DC hybrid power supply.

[0003] Currently, the distribution system mainly adopts independently set AC distribution equipment and DC distribution equipment, which are respectively responsible for the power supply tasks of AC loads and DC loads. Various energy storage devices, photovoltaic power generation devices, and charging devices adopt a decentralized access method and are connected to the distribution network through dedicated converter devices.

[0004] The existing distribution system equipment is scattered, occupying a large space, and the AC and DC equipment operates independently, making it difficult to achieve efficient energy mutual assistance and unable to realize the collaborative management of multiple energy sources. This situation needs to be further improved. Summary of the Invention

[0005] In order to solve the problems of the existing system equipment being scattered, occupying a large space, the AC and DC equipment operating independently, making it difficult to achieve efficient energy mutual assistance, and unable to realize the collaborative management of multiple energy sources, this application provides a network-constructing prefabricated multi-electric energy AC / DC distribution system and a control method thereof, adopting the following technical solutions: In a first aspect, this application provides a network-constructing prefabricated multi-electric energy AC / DC distribution system, including multiple types of integrated equipment with standardized interfaces reserved; the multiple types of equipment include: A medium-voltage distribution unit, including a high-voltage compartment, a distribution transformer compartment, and a low-voltage compartment; A dual-bus system, including an AC bus bridge and a DC bus bridge, and the AC bus bridge and the DC bus bridge work together; An equipment converter compartment, including a DC / AC energy storage converter, a DC / DC energy storage converter for energy storage device access, and a DC / AC photovoltaic inverter for photovoltaic power generation access; A network-constructing bidirectional converter compartment, electrically connected to the dual-bus system, for forming an AC / DC hybrid distribution network architecture and realizing two-way conversion of system-level electric energy; A power generation access compartment, for accessing external power generation equipment; A battery compartment, including an AC bus energy storage battery pack and a DC bus energy storage battery pack; An electric vehicle charger compartment, including a DC bus DC / DC charger group and an AC bus AC / DC charger group; Multi - energy collaborative control device, used for intelligent control and energy allocation of various devices.

[0006] By adopting the above technical solution, in this application, through setting a dual - bus structure, the AC bus bridge and the DC bus bridge are organically combined to achieve flexible conversion of AC and DC electric energy; a network - forming bidirectional converter is adopted to form a hybrid distribution network structure, breaking through the limitation of the single function of traditional distribution equipment; by designing a multi - energy collaborative control device, unified allocation of equipment such as energy storage converters and photovoltaic inverters is realized; this application not only realizes the integrated integration of equipment, but also improves the adaptability and reliability of the system through intelligent control; in particular, through pre - installed design and standardized interfaces, the on - site installation and commissioning costs are significantly reduced; through the electric energy mutual assistance mechanism of AC and DC buses, the configuration capacity of equipment such as energy storage is reduced, and at the same time, optimized scheduling is carried out using real - time electricity price differences, significantly reducing the system operation cost.

[0007] Optionally, the multi - energy collaborative control device includes: A station - level power management system and multiple edge control units. Among them, the edge control units are respectively installed on the AC bus bridge and the DC bus bridge for realizing point - to - point data interaction.

[0008] By adopting the above technical solution, this application proposes a hierarchical collaborative control solution of "station - level management + edge control". Edge control units are respectively deployed on the AC and DC bus bridges to achieve near - field perception and rapid response; through the point - to - point data interaction of the edge control units, the devices can autonomously coordinate their operating states, while the station - level power management system is responsible for global optimization and policy distribution, forming a control architecture that combines local autonomy and overall coordination; it not only significantly improves the real - time performance and reliability of the system, but also reduces the communication bandwidth requirements, providing a solution idea for the collaborative control of large - scale distributed devices.

[0009] Optionally, the EtherCAT communication method is adopted between the edge control unit and various devices, and the EtherNET or CAN communication method is adopted between the edge control unit and the station - level power management system.

[0010] By adopting the above technical solution, this application adopts EtherCAT real - time Ethernet technology at the device layer; at the management layer, the EtherNET or CAN communication method is flexibly selected to meet the requirements of large - data - volume transmission and remote management; by selecting the most suitable communication technology at different levels, it not only ensures the rapid response of the underlying devices, but also ensures the reliable transmission of management - layer data, forming a communication system with complementary performance and coordinated unity.

[0011] Optionally, the standardized interface includes: A communication interface with the upper - level control platform, used for receiving power curve control strategies; An interconnection interface with an adjacent substation for realizing the mutual supply of electrical energy between stations.

[0012] By adopting the above technical solution, the present application designs a double-layer standardized interface architecture, which docks with the regulation and control platform upwards, receives the power curve control strategy based on big data analysis, and realizes intelligent dispatching; externally, it interconnects with adjacent substations to support the flexible mutual supply of electrical energy between stations; through the standardized interface, independent substations are integrated into network nodes that operate in coordination, which can not only execute the optimized dispatching instructions of the superior platform, but also realize the mutual supply of electrical energy between stations, forming an intelligent power distribution network that is vertically controllable and horizontally interconnected.

[0013] Optionally, various devices are connected to the system through intelligent circuit breakers, and the intelligent circuit breakers use the power line broadband carrier HPLC communication method to interact with the multi-energy collaborative control device for data.

[0014] By adopting the above technical solution, the present application integrates the HPLC communication module in the intelligent circuit breaker, uses the existing power line as the communication medium, and establishes a reliable data interaction channel with the multi-energy collaborative control device, which not only saves the layout of dedicated communication lines, but also improves the anti-interference ability of the system.

[0015] Optionally, the system has a grid-connected operation mode, a blockchain operation mode, and a self-constructed network operation mode; The grid-connected operation mode is used to realize the electrical energy exchange with the large power grid; The blockchain operation mode is used to realize the self-sufficiency of electrical energy within a local area; The self-constructed network operation mode is used to realize independent operation.

[0016] By adopting the above technical solution, the system coordinates and interacts with the large power grid in the grid-connected mode and participates in the electricity market transaction; in the blockchain mode, it first realizes the autonomous balance of the source-network-load-storage within the region and improves the new energy consumption level; the self-constructed network mode ensures that the system can operate independently and stably in extreme cases; by intelligently identifying the system state and external conditions, it adaptively switches to the optimal operation mode, forming a complete multi-mode collaborative operation mechanism.

[0017] Optionally, the system realizes the mutual supply of electrical energy through the multi-energy collaborative control device, including the mutual supply of electrical energy inside the AC bus bridge, the mutual supply of electrical energy inside the DC bus bridge, the mutual supply of electrical energy between the AC bus bridge and the DC bus bridge, and the mutual supply of electrical energy between adjacent substations.

[0018] By adopting the above technical solutions, this application constructs a multi-level electric energy mutual assistance system, achieving energy balance among similar devices inside the busbar; realizing optimized energy allocation between AC and DC busbars through a network-forming bidirectional converter; and supporting inter-station energy mutual assistance through standardized interfaces, thus realizing an electric energy mutual assistance network of "multi-level horizontally and whole-process vertically". The system can intelligently allocate the electric energy flow of each level according to the real-time operation status, ensuring both local supply-demand balance and improving the overall energy utilization efficiency.

[0019] In a second aspect, this application provides a control method for a network-forming prefabricated multi-electric energy AC / DC power distribution system, which is applied to the above-mentioned network-forming prefabricated multi-electric energy AC / DC power distribution system, and includes the following steps: Collect the operation data of various devices through a multi-energy collaborative control device; Based on the operation data, perform the following controls through a multi-energy collaborative control device: Control the network-forming bidirectional converter compartment to achieve bidirectional power conversion and voltage stability between the AC and DC busbars; Adjust the working states of the DC / AC energy storage converter and the DC / DC energy storage converter in the device converter compartment to achieve the orderly access of energy storage devices; Control the working state of the DC / AC photovoltaic inverter in the device converter compartment to achieve grid-connected operation of photovoltaic power generation; Manage the charging and discharging process of the AC / DC bus energy storage battery pack in the battery compartment; Adjust the charging power of the charger set in the electric vehicle charger compartment; Realize data interaction with the superior control platform through a standardized interface, and the control system operates according to the received power curve strategy.

[0020] By adopting the above technical solutions, this application first establishes a unified data acquisition system to obtain the operation status of various devices in real time; then, through a hierarchical and classified control strategy, it realizes voltage stability control of the network-forming converter, orderly access control of energy storage devices, grid-connected control of photovoltaic power generation, charging and discharging management of battery packs, and power regulation of charging devices; finally, it collaborates with the superior platform to execute an optimized power curve control strategy. Through the multi-energy collaborative control device, the integration and intelligence of device control are realized, forming a complete closed-loop control system, providing a reliable guarantee for the stable and efficient operation of the new power distribution system.

[0021] Optionally, the multi-energy collaborative control device monitors the system operation status in real time, including the following steps: Detect the operation parameters of various devices and the system status; When a device failure is detected, start the corresponding device protection control; When a system anomaly is detected, perform the following operations according to the type of failure: When the voltage of the busbar bridge is abnormal, control the relevant converters to adjust the voltage; When the power transmission is abnormal, adjust the power mutual assistance strategy; When the communication is interrupted, switch to the local emergency control mode.

[0022] By adopting the above technical solutions, this application designs a three-level fault protection system. The first level implements fast protection control for single equipment faults; the second level establishes a classification processing mechanism for system anomalies, including closed-loop regulation of voltage anomalies and strategy optimization of abnormal power transmission; the third level sets up a communication fault tolerance mechanism, which automatically switches to the local emergency control mode when the communication is interrupted; through real-time monitoring and intelligent judgment, corresponding protection measures are taken according to the fault type, forming a complete fault prevention and control system, providing all-round guarantee for the safe and reliable operation of the distribution system.

[0023] Optionally, the multi-energy collaborative control device executes the following control strategies according to the system operation mode: In the grid-connected operation mode, prioritize ensuring the power exchange balance with the large power grid; In the blockchain operation mode, prioritize ensuring the supply-demand balance within a local area; In the self-constructed network operation mode, prioritize ensuring the stability of the system frequency and voltage.

[0024] By adopting the above technical solutions, the system takes the power exchange balance as the core in the grid-connected mode to ensure the completion of the dispatching task; in the blockchain mode, it focuses on the local supply-demand balance to improve the in-situ energy consumption rate; in the self-constructed network mode, it prioritizes ensuring the stability of the frequency and voltage to ensure the safe operation of the system; by identifying the current operation mode and automatically switching to the most suitable control strategy, a mode-adaptive intelligent control system is formed.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a dual busbar architecture, this application organically combines the AC busbar bridge and the DC busbar bridge to achieve flexible conversion of AC and DC electric energy; adopts a network-forming bidirectional converter to form a hybrid distribution network architecture, breaking through the limitations of the single function of traditional distribution equipment; by designing a multi-energy collaborative control device, it realizes the unified allocation of equipment such as energy storage converters and photovoltaic inverters; this application not only realizes the integrated integration of equipment, but also improves the adaptability and reliability of the system through intelligent control; in particular, through prefabricated design and standardized interfaces, the on-site installation and commissioning costs are significantly reduced; through the power mutual assistance mechanism of the AC and DC busbars, the configuration capacity of equipment such as energy storage is reduced, and at the same time, the real-time electricity price difference is used for optimal dispatching, significantly reducing the system operation cost; 2. The present application proposes a hierarchical collaborative control scheme of "substation-level management + edge control". Edge control units are respectively deployed on the AC and DC bus bridges to achieve nearby perception and rapid response. Through the point-to-point data interaction of the edge control units, the devices can autonomously coordinate their operating states, while the substation-level power management system is responsible for global optimization and policy distribution, forming a control architecture that combines local autonomy and overall coordination. This not only significantly improves the real-time performance and reliability of the system, but also reduces the communication bandwidth requirements, providing a solution idea for the collaborative control of large-scale distributed devices. 3. The present application designs a double-layer standardized interface architecture. It is docked with the regulation and control platform upwards to receive the power curve control strategy based on big data analysis and achieve intelligent scheduling. It is interconnected with adjacent substations outwards to support flexible mutual aid of inter-station electrical energy. By integrating independent substations into network nodes that operate collaboratively through standardized interfaces, it can not only execute the optimized scheduling instructions of the superior platform, but also achieve the mutual aid of electrical energy between stations, forming an intelligent power distribution network that is vertically controllable and horizontally interconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the architecture of a network-forming prefabricated multi-electrical energy AC / DC power distribution system according to an embodiment of the present application; Figure 2 is a control principle diagram of a network-forming prefabricated multi-electrical energy AC / DC power distribution system according to an embodiment of the present application; Figure 3 is a flowchart of a control method for a network-forming prefabricated multi-electrical energy AC / DC power distribution system according to an embodiment of the present application; Figure 4 is an internal structure diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above", "said", "this" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in the present application refers to any or all possible combinations including one or more of the listed items.

[0028] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0029] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings of the specification.

[0030] In a first aspect, the present application provides a network-constructing prefabricated multi-electric energy AC / DC power distribution system, which includes multiple types of devices with an integrated design and reserves standardized interfaces; referring to Figure 1 , that is, a multi-electric energy AC / DC intelligent power distribution island, and multiple types of devices include: A medium-voltage power distribution unit, which includes a high-voltage compartment, a distribution transformer compartment, and a low-voltage compartment.

[0031] Among them, the high-voltage compartment is used to connect to the superior power grid, the distribution transformer compartment realizes voltage level conversion, and the low-voltage compartment is used for the access of low-voltage devices. The high-voltage compartment adopts a fully enclosed design and has good insulation performance and protection level.

[0032] A dual-bus system, which includes an AC bus bridge and a DC bus bridge, and the AC bus bridge and the DC bus bridge work together.

[0033] Among them, the working voltage of the AC bus bridge is AC0.4kV and is used to connect traditional AC devices; the working voltage of the DC bus bridge is DC±375V and is mainly used for the access of new energy and energy storage devices. The two buses realize bidirectional energy flow through intelligent control.

[0034] An equipment converter compartment, which includes a DC / AC energy storage converter, a DC / DC energy storage converter for the access of energy storage devices, and a DC / AC photovoltaic inverter for the access of photovoltaic power generation.

[0035] Among them, the energy storage converter adopts a bidirectional design and supports the charge and discharge control of energy storage devices; the photovoltaic inverter has a maximum power point tracking function to improve the power generation efficiency. All converters adopt a modular design, which is convenient for maintenance and expansion.

[0036] A network-constructing bidirectional converter compartment, which is electrically connected to the dual-bus system and is used to form an AC / DC hybrid power distribution network architecture and realize the bidirectional conversion of system-level electric energy.

[0037] Among them, the network-constructing bidirectional converter has a voltage source characteristic and can independently control the AC / DC bus voltage. It is the core device for realizing the AC / DC hybrid power distribution network. The converter adopts a multi-level topology structure and has the characteristics of high efficiency and low harmonics.

[0038] A power generation access compartment, which is used to access external power generation equipment.

[0039] Among them, the power generation access compartment reserves standardized interfaces and supports the flexible access of various distributed power generation devices, such as gas turbines, micro gas turbines, etc. The access compartment is equipped with a perfect protection device and monitoring system.

[0040] The battery compartment includes an AC bus energy storage battery pack and a DC bus energy storage battery pack.

[0041] Among them, the energy storage battery adopts a modular design, supporting flexible capacity configuration. It is equipped with a battery management system to achieve battery status monitoring and protection functions. Different types of batteries can be selected, such as lithium batteries, sodium-ion batteries, etc.

[0042] The electric vehicle charger compartment includes a DC bus DC / DC charger group and an AC bus AC / DC charger group.

[0043] Among them, the electric vehicle charger compartment supports multiple charging modes to meet the charging needs of different types of electric vehicles. The charger has the characteristic of adjustable power and can participate in system peak shaving and valley filling. It is equipped with complete metering and settlement functions.

[0044] The multi-energy collaborative control device is used for intelligent control and energy allocation of various devices.

[0045] Among them, the multi-energy collaborative control device adopts a hierarchical distributed control architecture to achieve coordinated control of the device layer, station level layer, and system layer. It supports multiple communication protocols to ensure the real-time and reliable operation of the system. It has fault diagnosis and self-healing functions.

[0046] In one embodiment, referring to Figure 2 , the grid-forming prefabricated multi-electric energy AC / DC distribution system adopts a hierarchical distributed control architecture, and the specific implementation is as follows: At the medium-voltage (10kV) system level, electric energy collaborative control is achieved. The system is bridged with the large power grid through the station-level power energy management system (M-EMS), and can be used as both an electricity consumption system and a power generation system. The M-EMS can receive various policy instructions such as power curve control from the superior control platform to achieve the aggregated collaborative allocation of the microgrid group. At the same time, the system supports the interconnection of electric energy between stations, and energy collaboration can be achieved between adjacent substations (or distribution areas) according to the load situation. It can operate independently or in a closed-loop interconnected manner. Through the integrated information sharing of power consumption, power generation, and intelligent control, the system also has self-healing and network reconfiguration capabilities, and can achieve network reconfiguration of the AC / DC coexisting distribution network under normal operation and fault conditions.

[0047] At the low-voltage distribution level, the system realizes the electric energy collaborative control of the AC bus and the DC bus respectively: In terms of the electric energy collaboration of the AC bus, traditional AC bus equipment (such as photovoltaic power generation, electrochemical energy storage, charging piles, other AC users, grid loads, etc.) conducts point-to-point data interaction through the multi-electric energy control device. The system uses the edge computing function to control the voltage of the AC bus and the equipment and determine the direction of electric energy flow. The specific working modes include: the power generation inside the bus directly supplies the load, and when the electric energy is insufficient, it pulls electric energy from the grid; when there is surplus electric energy inside the bus, the excess electric energy is sent to the grid.

[0048] In terms of the coordinated DC bus electrical energy, the system uses the DC bus to simplify the electrical energy conversion methods of photovoltaic power generation, electrochemical energy storage, and charging piles, significantly improving the electrical energy utilization efficiency. Point-to-point data interaction is achieved through the M-ECU to control the DC bus and equipment voltages and determine the flow direction of electrical energy. Its working mode is the same as that of the AC bus.

[0049] In terms of the mutual assistance of AC and DC bus electrical energy, M-ECUs are installed on the AC bus and the DC bus respectively in the system. These M-ECUs interact with the station-level multi-energy management platform M-EMS. M-EMS realizes the mutual assistance of electrical energy between the AC bus and the DC bus by judging the load conditions of this substation (or distribution area), achieving the purpose of internal circulation of electrical energy. When the system's electrical energy is insufficient, it draws power from the grid, and when there is a surplus, it sends the excess power back to the grid.

[0050] In terms of equipment access and monitoring, each device in the system is connected through an intelligent circuit breaker to achieve online feeder protection and operation status monitoring. These intelligent circuit breakers use the power line broadband carrier HPLC communication method to interact with the multi-energy collaborative control device, and can safely withdraw from the system operation when the device fails or needs maintenance.

[0051] In terms of communication control, the EtherCAT communication method is adopted between the device and the M-ECU to ensure microsecond-level data transmission at the device layer, enabling the bus voltage collaborative control to reach millisecond-level response speed. Between the M-ECU and the M-EMS, the EtherNET or CAN communication method is adopted to achieve station-level millisecond-level response based on the microsecond-level response at the device layer, ensuring the real-time performance of the entire system.

[0052] This hierarchical distributed control architecture realizes the full-scale intelligent control from the device to the system through multi-level collaborative cooperation, ensuring the safe and stable operation of the AC-DC hybrid distribution network.

[0053] In the second aspect, referring to Figure 3 , this application provides a control method for a network-forming prefabricated multi-electrical energy AC-DC distribution system, which is applied to the above-mentioned network-forming prefabricated multi-electrical energy AC-DC distribution system, and includes the following steps: S310. Collect the operation data of various devices through the multi-energy collaborative control device.

[0054] Specifically, the data collected at the device layer includes: electrical quantities such as the input and output voltages, currents, and power factors of the network-forming bidirectional converter; the charge and discharge power and battery pack SOC of the energy storage converter; the power generation power and grid-connected current of the photovoltaic inverter; the charging power and charging status of the charging device, etc. The system pre-establishes a device parameter mapping table to convert the collected original data into a standard data format.

[0055] S320. Based on the operation data, perform operation control through the multi - energy collaborative control device.

[0056] Among them, the operation control includes the following controls: Control the grid - forming bidirectional converter compartment to achieve bidirectional power conversion and voltage stability between the AC - DC bus bridges; Adjust the working states of the DC / AC energy storage converter and the DC / DC energy storage converter in the equipment converter compartment to achieve the orderly access of energy storage devices; Control the working state of the DC / AC photovoltaic inverter in the equipment converter compartment to achieve the grid - connected operation of photovoltaic power generation; Manage the charging and discharging process of the AC - DC bus energy storage battery pack in the battery compartment; Adjust the charging power of the charger set in the electric vehicle charger compartment.

[0057] Specifically, for the control of the grid - forming bidirectional converter, a simple PI controller is used to achieve voltage stability; For the energy storage system, a charge - discharge strategy based on fuzzy logic is established, and economic operation is achieved by combining electricity price and load prediction. Define the power output Ps(t)=f(SOC(t), PL(t), λ(t)), where PL is the load power and λ is the electricity price coefficient, while considering the SOC constraint and power constraint; For photovoltaic power generation, an improved perturbation observation method is used to achieve MPPT control. By calculating the power change ΔP and voltage change ΔV, the voltage regulation direction is determined according to the sign of ΔP / ΔV; For the charging equipment, orderly charging management is achieved by establishing a priority ranking table. The overall optimization of the system is realized through a coordinated control algorithm among various control strategies.

[0058] S330. Achieve data interaction with the superior control platform through a standardized interface, and the control system operates according to the received power curve strategy.

[0059] Specifically, a time - segmented power prediction model is established, and the power generation and consumption power curves of the system are predicted by combining historical data and weather forecast information. At the same time, a simple power distribution table is established, and the system power is reasonably distributed according to the characteristics and efficiencies of various devices to achieve economic and efficient operation. The system regularly reports operation data to the superior platform through a standardized data interface and responds to control instructions.

[0060] Furthermore, in this embodiment, a prediction model based on multi-factor weighting is established: P(t) = w1P1(t) + w2P2(t) + w3P3(t), where w1, w2, and w3 are weight coefficients and their sum is 1; for power allocation, the optimization objective function minJ = Σ(αiPi(t)^2 + βi*ΔPi(t)^2) is adopted, considering the total power balance constraint ΣPi(t) = PD(t) and the equipment operation constraints. Here, P1(t) represents the historical power data in the same period, P2(t) represents the estimated power generation based on weather forecasts, and P3(t) represents the load prediction value. In particular, when performing power allocation, the system takes the power mutual assistance ability between the AC and DC buses as an important constraint condition, that is, Pij(t) ≤ Pij,max, where Pij(t) represents the power transmission amount from bus i to bus j; at the same time, based on the real-time electricity price difference ΔCij(t) = λi(t) - λj(t), the mutual assistance power flow is dynamically optimized, and the mutual assistance mechanism is triggered when the electricity price difference exceeds the set threshold. Through this prediction-allocation mechanism, the system can not only achieve the coordinated control of various devices, but more importantly, make full use of the mutual assistance ability of the AC and DC buses to achieve economic optimization while ensuring power supply reliability. For example, when there is a power shortage in a certain bus, the system will preferentially dispatch electric energy from adjacent buses with lower electricity prices, and at the same time consider transmission losses and equipment capacity limitations to achieve the optimal electric energy mutual assistance plan.

[0061] In one embodiment, the multi-energy collaborative control device also realizes the real-time monitoring and fault handling functions of the system operation state. This embodiment establishes a hierarchical and classified monitoring system to comprehensively monitor the system operation state through monitoring points at different levels.

[0062] Specifically, the system operation state monitoring adopts a three-level monitoring architecture: device-level monitoring, system-level monitoring, and fault handling. Device-level monitoring mainly collects the basic operation parameters of various devices, such as voltage, current, power, etc.; system-level monitoring focuses on the bus voltage stability, power transmission status, and communication link integrity; fault handling starts corresponding protection control strategies according to different fault types.

[0063] In terms of fault handling, this embodiment designs an adaptive fault response mechanism. When a device fault is detected, the system first isolates the faulty device and starts standby devices or adjusts the operation mode; when the bus bridge voltage is abnormal, the system adjusts the output characteristics of relevant converters through fast PI control; when there is an abnormal power transmission, the system reallocates the power flow according to the preset priority table; when the communication system is interrupted, each control unit automatically switches to the local control mode to ensure the operation of basic functions.

[0064] In terms of operation mode control, this embodiment adopts a hierarchical distributed control strategy. When operating in parallel with the grid, the system achieves power balance with the grid through feedforward-feedback control; when the blockchain is operating, a distributed negotiation algorithm is adopted to achieve local supply-demand balance; when operating in a self-constructed network mode, the master-slave control strategy is adopted to ensure the stability of the system frequency and voltage. The switching between different operation modes is smoothly transitioned through a state machine.

[0065] For example, when the system switches from the grid-connected mode to the self-constructed network mode, the control device first locks the power exchange point, then gradually adjusts the operating states of internal devices, and finally establishes an independent voltage and frequency control system. During this process, the energy storage system, as a key support device, ensures the stability of the switching process through rapid power regulation.

[0066] It can be understood that this embodiment realizes the safe and reliable operation of the system by establishing a complete monitoring and protection system and combining control strategies under different operation modes. The system can adaptively adjust the control strategy according to the real-time operating state to ensure the continuity and reliability of power supply.

[0067] In one embodiment, the present application provides an electronic device, which may be a server, and its internal structure diagram may be as Figure 4 shown. The electronic device includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store data. The network interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it realizes the steps performed by a network-constructing pre-installed multi-electric energy AC-DC power distribution system.

[0068] Those skilled in the art can understand that Figure 4 the structure shown in

[0069] is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0070] Those of ordinary skill in the art can understand that all or part of the processes in the above-described embodiment systems can be completed by instructing relevant hardware through a computer program. The above computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes executed in the above-described embodiments of each system. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0071] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A prefabricated multi-energy AC / DC power distribution system, characterized in that: Includes multiple types of equipment with integrated design and reserved standardized interfaces; The multiple types of equipment include: Medium voltage distribution unit, including high voltage compartment, distribution transformer compartment and low voltage compartment; A double bus system, comprising an AC bus bridge and a DC bus bridge, wherein the AC bus bridge and the DC bus bridge work in coordination; Equipment converter compartment, including DC / AC energy storage converter and DC / DC energy storage converter for energy storage equipment access, and DC / AC photovoltaic inverter for photovoltaic power generation access; A grid-forming bidirectional converter compartment, electrically connected to the double bus system, for forming an AC / DC hybrid distribution network architecture and realizing bidirectional conversion of system-level electric energy; Power generation access warehouse, used to access external power generation equipment; Battery compartment, including AC bus energy storage battery pack and DC bus energy storage battery pack; Electric vehicle charging station, including DC bus DC / DC charging unit and AC bus AC / DC charging unit; Multi-energy collaborative control device is used for intelligent control and energy allocation of various equipment.

2. The grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 1 is characterized in that: The multi-energy coordinated control device comprises: A station-level power management system and multiple edge control units, wherein the edge control units are respectively installed on the AC bus bridge and the DC bus bridge to realize point-to-point data interaction.

3. The control method of the grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 2 is characterized in that: The edge control unit communicates with various devices using EtherCAT, and the edge control unit communicates with the station-level power management system using EtherNET or CAN.

4. The grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 1, characterized in that: The standardized interface includes: Communication interface with the upper control platform, used to receive power curve control strategy; The interconnection interface with adjacent substations is used to achieve mutual electric energy between stations.

5. The grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 1 is characterized in that: Various types of equipment are connected to the system through intelligent circuit breakers, and the intelligent circuit breakers use power line broadband carrier HPLC communication to exchange data with the multi-energy collaborative control device.

6. The grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 1, characterized in that: The system has a grid-connected operation mode, a blockchain operation mode and a self-constructed network operation mode; The grid-connected operation mode is used to realize the exchange of electric energy with the large power grid; The blockchain operation mode is used to achieve self-sufficiency in electricity in a local area; The self-constructed network operation mode is used to achieve independent operation.

7. The grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 1, characterized in that: The system realizes electric energy mutual assistance through a multi-energy cooperative control device, including electric energy mutual assistance within an AC bus bridge, electric energy mutual assistance within a DC bus bridge, electric energy mutual assistance between an AC bus bridge and a DC bus bridge, and electric energy mutual assistance between adjacent substations.

8. A control method for a pre-installed multi-electric AC / DC power distribution system, characterized in that: The grid-type prefabricated multi-electric energy AC / DC power distribution system as described in any one of claims 1 to 7 comprises the following steps: Collect the operation data of various equipment through multi-energy collaborative control devices; Based on the operating data, the following control is performed by the multi-energy coordinated control device: The control grid-type bidirectional converter compartment realizes bidirectional power conversion and voltage stabilization between AC and DC bus bridges; Adjust the working status of the DC / AC energy storage converter and DC / DC energy storage converter in the converter compartment of the equipment to achieve orderly access to the energy storage equipment; Control the working status of the DC / AC photovoltaic inverter in the equipment converter compartment to achieve grid-connected operation of photovoltaic power generation; Manage the charging and discharging process of the AC and DC busbar energy storage battery packs in the battery compartment; Adjust the charging power of the charging unit in the electric vehicle charging station; Data interaction with the superior control platform is achieved through a standardized interface, and the control system operates according to the received power curve strategy.

9. The control method of the grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 8 is characterized in that: The multi-energy collaborative control device monitors the system operation status in real time, including the following steps: Detect the operating parameters and system status of various equipment; When equipment failure is detected, the corresponding equipment protection control is activated; When a system abnormality is detected, the following operations are performed according to the fault type: When the bus bridge voltage is abnormal, control the relevant converter to adjust the voltage; When power transmission is abnormal, adjust the power mutual assistance strategy; When communication is interrupted, switch to local emergency control mode.

10. The control method of the grid-type prefabricated multi-electric energy AC / DC power distribution system according to claim 8, characterized in that: The multi-energy coordinated control device executes the following control strategy according to the system operation mode: In the grid-connected operation mode, priority is given to ensuring the power exchange balance with the large power grid; Under the blockchain operation mode, priority is given to ensuring the balance of supply and demand in the local area; In the self-constructed network operation mode, priority is given to ensuring the stability of system frequency and voltage.

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