Communication system for a distributed power plant and method for controlling the same

Abstract

The application discloses a communication system for a distributed power station and a control method thereof, and belongs to the technical field of power supply systems. The communication system comprises: at least two first control units, the first control units corresponding to power areas one by one, and the first control units being in communication connection with power equipment in the power areas; at least two first communication modules, the first communication modules corresponding to the first control units one by one, the first communication modules being in communication connection with the first control units or the power equipment, and the first communication modules of the at least two power areas being in wireless communication connection with an energy scheduling module of the distributed power station; and a grid-connected point acquisition device, the grid-connected point acquisition device being in communication connection with the power equipment or the first control units, and the grid-connected point acquisition device being used for acquiring operation parameters of a grid-connected point of the distributed power station. The system can reduce deployment of long-distance communication lines of the distributed power station, and effectively reduce construction complexity and cost.

Description

Technical Field

[0001] This application belongs to the field of power supply system technology, and in particular relates to a communication system and control method for distributed power stations. Background Technology

[0002] To achieve unified energy management of distributed photovoltaic (PV) power plants (such as self-consumption and grid connection point anti-backflow), it is necessary to establish a communication network for the distributed PV equipment such as inverters and converters within the plant (these devices are usually installed near the PV panels). Currently, wired communication is commonly used, which requires laying long-distance communication cables and carrying out construction operations such as conduit installation and underground burial throughout the entire plant, resulting in complex construction and high costs. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a communication system and control method for distributed power plants, which can solve the problem of communication cable deployment in distributed power plants, effectively reducing construction complexity and cost.

[0004] In a first aspect, this application provides a communication system for a distributed power station, the distributed power station having at least two power zones, each power zone equipped with power equipment, and the communication system comprising: At least two first control units, each of which corresponds to a power zone, and each of the first control units is communicatively connected to the power equipment within the power zone; At least two first communication modules, each corresponding to a first control unit, are communicatively connected to the first control unit or the power equipment. The first communication modules of the at least two power areas establish a wireless communication connection with the energy dispatch module of the distributed power station. A grid connection point acquisition device is communicatively connected to the power equipment or the first control unit, and the grid connection point acquisition device is used to collect the operating parameters of the grid connection point of the distributed power station.

[0005] According to the communication system for distributed power stations of this application, by dividing the power area into multiple power zones, a first control unit and a first communication module are equipped in each power zone. The first communication module establishes a wireless communication connection with the energy dispatch module of the distributed power station, and the grid point acquisition device communicates with the power equipment or the first control unit. The two-way communication function of energy management of the distributed power station is realized wirelessly, which can reduce the deployment of medium and long distance communication lines in the distributed power station and effectively reduce construction complexity and cost.

[0006] According to one embodiment of this application, the first control unit is disposed within one of the power devices in the power area; Alternatively, the first control unit may be a controller independent of the power equipment, and the first control unit may establish a wired or wireless communication connection with the power equipment.

[0007] According to one embodiment of this application, the first communication module is disposed in one of the power devices within the power area; Alternatively, the first communication module may be a communication module independent of the power equipment.

[0008] According to one embodiment of this application, the grid connection point acquisition device is connected to the power equipment or the first control unit within a preset distance range via a communication cable.

[0009] Secondly, this application provides a control method for the communication system for distributed power plants described in the first aspect above, the method comprising: The first control unit acquires the first operating parameters of the power equipment in the power area and sends the second operating parameters of the power area to the energy dispatch module. The second operating parameters are determined based on the first operating parameters of each of the power equipment in the power area. The grid connection point acquisition device acquires the third operating parameters of the grid connection point and sends the third operating parameters to the energy scheduling module. The energy scheduling module generates a first control parameter based on at least one of the second operating parameter and the third operating parameter, and sends the first control parameter to the corresponding first control unit; The first control unit generates a second control parameter based on the first control parameter, and sends the second control parameter to the corresponding power equipment.

[0010] According to the control method of this application, the first control unit and the grid connection point acquisition device feed back operating parameters to the energy dispatching module through the first communication module. The energy dispatching module sends control parameters to each power equipment through the first communication module and the first control unit. Regional data aggregation and command forwarding are realized through wireless communication. While maintaining the rapid response of energy dispatching in the distributed power station, the deployment of medium and long distance communication lines in the distributed power station is reduced, effectively reducing construction complexity and cost.

[0011] According to one embodiment of this application, the method further includes: When the number of first power zones is greater than or equal to a preset threshold, the energy scheduling module performs energy scheduling for each first power zone based on the second operating parameters of each first power zone, and the communication between the first control unit of the first power zone and the energy scheduling module is normal. Alternatively, if the number of the first power zones is less than the preset threshold, the energy scheduling module outputs an alarm message to indicate a communication anomaly at the distributed power station.

[0012] According to one embodiment of this application, energy dispatching is performed on each of the first power zones, including: When the communication between the energy dispatch module and the grid connection point acquisition device is normal, the energy dispatch module performs energy dispatch according to the closed-loop control strategy based on the second operating parameters of each first power area and the third operating parameters sent by the grid connection point acquisition device. Alternatively, in the event of a communication failure between the energy dispatch module and the grid connection point acquisition device, the energy dispatch module performs energy dispatch based on the second operating parameters of each of the first power regions, following an open-loop control strategy.

[0013] According to one embodiment of this application, the open-loop control strategy includes: using zero power as the output power reference value, using the allowed reverse current power at the grid connection point as the upper limit of the output power, and using the allowed power consumption at the grid connection point as the lower limit of the output power.

[0014] According to one embodiment of this application, the method further includes: When the distributed power station is operating in closed-loop mode, in response to a communication failure with the grid connection point acquisition device, the energy dispatch module outputs a shutdown command to each of the first control units, or switches the operating mode of the distributed power station to open-loop mode.

[0015] According to one embodiment of this application, the method further includes: When the distributed power station is operating in open-loop mode, in response to a communication failure with the energy dispatch module, the first control unit controls the power equipment in the power area to shut down, or sends the second control parameters to the corresponding power equipment based on the historical first control parameters.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the structural schematic diagrams of a communication system for distributed power stations provided in the embodiments of this application; Figure 2 This is a second schematic diagram of the structure of a communication system for distributed power stations provided in an embodiment of this application; Figure 3 This is the third schematic diagram of the structure of the communication system for distributed power stations provided in the embodiments of this application; Figure 4 This is the fourth schematic diagram of the communication system for distributed power stations provided in the embodiments of this application; Figure 5 This is the fifth schematic diagram of the communication system for distributed power stations provided in the embodiments of this application; Figure 6 This is the sixth schematic diagram of the communication system for distributed power stations provided in the embodiments of this application; Figure 7 This is a flowchart illustrating the control method provided in the embodiments of this application.

[0018] Figure label: First control unit 110, first communication module 120, grid connection point acquisition device 130 Power area 201, power equipment 210, converter 211, DC equipment 212, AC equipment 213, inverter 214, cloud server 311, local energy management system 312. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] The following description, in conjunction with the accompanying drawings, details the communication system for distributed power stations and the control method for the communication system provided in this application, through specific embodiments and application scenarios.

[0022] In this embodiment of the application, the distributed power station has at least two power areas 201, and power areas 201 are equipped with power equipment 210.

[0023] Understandably, in distributed power stations, the power equipment 210 is distributed in a relatively dispersed manner and needs to be interconnected through a communication network in order to achieve unified energy dispatch and management of the entire station.

[0024] In practice, distributed power stations can be industrial and commercial distributed photovoltaic power stations, residential rooftop distributed photovoltaic power stations, or distributed photovoltaic and energy storage power stations.

[0025] A distributed power station may include two or more power areas 201, and each power area 201 is equipped with one or more power devices 210, wherein the power devices 210 include, but are not limited to, converters 211, DC devices 212 (such as DC charging piles), AC devices 213 (such as AC charging piles), and inverters 214.

[0026] In this embodiment, within the power area 201, power can be transmitted between power devices 210 via power cables, and communication between power devices 210 can be wired or wireless.

[0027] The wired communication method between the power equipment 210 may include at least one of the following: Fast Ethernet (FE) network cable, RS-485 interface (Recommended Standard 485, RS-485), Controller Area Network (CAN), Serial Peripheral Interface (SPI), Universal Asynchronous Receiver / Transmitter (UART), Inter-Integrated Circuit (I2C), and Power Line Communication (PLC).

[0028] In this embodiment of the application, the communication system includes at least two first control units 110, at least two first communication modules 120, and a grid connection point acquisition device 130.

[0029] The first control unit 110 corresponds one-to-one with the power area 201, and each power area 201 corresponds to one first control unit 110. The first control unit 110 is communicatively connected to the power equipment 210 in the power area 201.

[0030] In some embodiments, the first control unit 110 is disposed within a power device 210 in the power area 201.

[0031] In this embodiment, within the power area 201, multiple power devices 210 can elect one power device 210 as the first control unit 110 through a competitive process.

[0032] For example, such as Figure 1 As shown, the power area 201 includes a converter 211, a DC device 212, an AC device 213, and an inverter 214. A certain converter 211 competes to become the first control unit 110 of the power area 201.

[0033] In other embodiments, the first control unit 110 is a controller independent of the power equipment 210, and the first control unit 110 establishes a wired communication connection or a wireless communication connection with the power equipment 210.

[0034] In this embodiment, the first control unit 110 is a controller independent of the power equipment 210, and each power equipment 210 in the power area 201 is connected to the first control unit 110 via wired or wireless means.

[0035] For example, such as Figure 2As shown, the power area 201 includes a converter 211, a DC device 212, an AC device 213, and an inverter 214. The first control unit 110 is a controller independent of the power devices 210. Multiple power devices 210 in the power area 201 are connected to the first control unit 110 through communication cables, that is, the first control unit 110 establishes a wired communication connection with the power devices 210.

[0036] The first communication module 120 corresponds one-to-one with the first control unit 110. Each first control unit 110 corresponds to one first communication module 120. The first communication module 120 can communicate directly with the first control unit 110, or it can communicate with the power equipment 210, and then establish a communication link with the first control unit 110 through the power equipment 210.

[0037] Within a distributed power station, the first communication module 120 of at least two power zones 201 establishes a wireless communication connection with the energy dispatch module of the distributed power station.

[0038] In this embodiment, each power zone 201 is equipped with a first control unit 110 and a first communication module 120. The first control unit 110 can collect the operating parameters of each power device 210 in the power zone 201 in real time, and the first communication module 120 can collect the operating parameters of multiple power zones 201 to the energy dispatch module, so that the energy dispatch module can perform unified dispatch and management of the distributed power stations.

[0039] Meanwhile, the first communication module 120 can also transmit the scheduling instructions issued by the energy scheduling module, and realize the equipment control within the power area 201 through the first control unit 110.

[0040] The energy dispatch module can be a cloud server 311 or a local energy management system 312 (Energy Management System, EMS).

[0041] In actual implementation, the first communication module 120 can be at least one of a mobile communication (MC) module, a Wi-Fi module, a Sub-1G module, and a Bluetooth module.

[0042] In this embodiment, if the first communication module 120 is a mobile communication module, the data collection and energy scheduling management within the power area 201 can be performed by the first control unit 110 to reduce traffic and improve control reliability.

[0043] In some embodiments, the first communication module 120 is disposed in a power device 210 within the power area 201, that is, the first communication module 120 is built into the power device 210.

[0044] In other embodiments, the first communication module 120 is a communication module independent of the power equipment 210.

[0045] The grid connection point acquisition device 130 is communicatively connected to the power equipment 210 or the first control unit 110. The grid connection point acquisition device 130 is used to collect the operating parameters of the grid connection point of the distributed power station.

[0046] It is understandable that distributed power plants can be connected to the power grid and exchange energy with the grid. The grid connection point acquisition device 130 is set at the grid connection point of the distributed power plant to collect the operating parameters of the grid connection point.

[0047] The grid connection point acquisition device 130 is communicatively connected to the power equipment 210 or the first control unit 110. It establishes a communication link with the first control unit 110 directly or indirectly, and transmits the operating parameters of the grid connection point to the first control unit 110. The first control unit 110 then uploads the operating parameters of the grid connection point to the energy management system. The energy management system performs unified scheduling and management of the distributed power station based on the operating parameters of the power equipment 210 and the grid connection point.

[0048] In some embodiments, the grid connection point acquisition device 130 is connected to the power equipment 210 or the first control unit 110 within a preset distance range via a communication cable.

[0049] In this embodiment, within the distributed power station, the power equipment 210 is relatively dispersed. The grid connection point acquisition device 130 is connected to the power equipment 210 or the first control unit 110 within a preset distance range via communication cables. The grid connection point acquisition device 130 is connected to the power equipment 210 or the first control unit 110 nearby via communication cables, which can reduce construction complexity and reduce costs.

[0050] It should be noted that when the total number of power equipment 210 and first control unit 110 within the preset distance range of grid connection point acquisition device 130 is greater than 1, the grid connection point acquisition device 130 is connected to the nearest power equipment 210 or first control unit 110 via a communication cable.

[0051] The following are some specific implementation examples.

[0052] like Figure 3As shown, the first communication module 120 is a mobile communication module independent of the power equipment 210. The first communication module 120 is connected to the first control unit 110 or the power equipment 210 through a communication cable. The first control unit 110 is selected through competition among multiple power equipment 210s. The first communication module 120 of multiple power areas 201 establishes a wireless communication connection with the cloud server 311, and the grid collection device 130 is connected to the nearest power equipment 210 through a wired connection.

[0053] like Figure 4 As shown, multiple power devices 210 in power area 201 are connected to an independently set first control unit 110. The first control unit 110 is connected to a first communication module 120, which is a mobile communication module. The first communication module 120 of multiple power areas 201 establishes a wireless communication connection with the cloud server 311, and the grid point acquisition device 130 is connected to the nearest power device 210 via a wired connection.

[0054] like Figure 5 As shown, the first communication module 120 is a Sub-1G module independent of the power equipment 210. The first communication module 120 is connected to the first control unit 110 or the power equipment 210 via a communication cable. The first control unit 110 is selected through competition among multiple power equipment 210s. The first communication module 120 of multiple power areas 201 establishes a wireless communication connection with the local energy management system 312. The grid point acquisition device 130 is connected to the nearest power equipment 210 via a wired connection.

[0055] like Figure 6 As shown, multiple power devices 210 in power area 201 are connected to an independently set first control unit 110. The first control unit 110 is connected to a first communication module 120, which is a Sub-1G module. The first communication module 120 of multiple power areas 201 establishes a wireless communication connection with the cloud server 311, and the grid point acquisition device 130 is connected to the nearest power device 210 via a wired connection.

[0056] In related technologies, wired communication is commonly used, which requires laying communication cables over long distances and carrying out construction operations such as pipe laying and burying throughout the entire site, resulting in complex construction and high costs.

[0057] In this embodiment, the distributed power station is divided into regions. Each power region 201 is equipped with a first control unit 110 and a first communication module 120. The first control unit 110 is used to collect the operating parameters of each power device 210 in the corresponding power region 201 in real time. The first communication modules 120 of multiple power regions 201 establish wireless communication connections with the energy dispatching module of the distributed power station. The grid connection point acquisition device 130 communicates with the power device 210 or the first control unit 110. The operating parameters of multiple power regions 201 and grid connection points are collected to the energy dispatching module wirelessly, or the dispatching instructions of the energy dispatching module are transmitted to the power device 210. This communication system provides two-way communication functions for data acquisition and instruction issuance for the energy management of the distributed power station. It can reduce the deployment of medium and long distance communication lines in the distributed power station and effectively reduce construction complexity and cost.

[0058] According to the communication system for distributed power stations provided in the embodiments of this application, by dividing multiple power areas 201, a first control unit 110 and a first communication module 120 are provided in each power area 201. The first communication module 120 establishes a wireless communication connection with the energy dispatch module of the distributed power station, and the grid point acquisition device 130 communicates with the power equipment 210 or the first control unit 110. The two-way communication function of energy management of the distributed power station is realized wirelessly, which can reduce the deployment of medium and long distance communication lines in the distributed power station and effectively reduce construction complexity and cost.

[0059] This application also provides a control method for the aforementioned communication system for distributed power plants.

[0060] like Figure 7 As shown, the control method includes steps 710 to 740.

[0061] Step 710: The first control unit 110 acquires the first operating parameters of the power equipment 210 in the power area 201 and sends the second operating parameters of the power area 201 to the energy dispatch module.

[0062] The second operating parameter is determined based on the first operating parameters of each power device 210 within the power area 201.

[0063] In this step, the first control unit 110 acquires the first operating parameters of each power device 210 in the power area 201 through wired or wireless communication. The first operating parameters include, but are not limited to, device type, rated power, rated energy storage capacity, energy storage state of charge, device online status, and device operating status.

[0064] In this embodiment, the first control unit 110 processes the first operating parameters of the collected power equipment 210 and obtains the second operating parameters of the power area 201. The second operating parameters include, but are not limited to, total rated power, total rated capacity of energy storage, total charging and discharging power of energy storage, comprehensive state of charge, and area online status.

[0065] In actual operation, the second operating parameters can be transmitted to the energy scheduling module via wireless communication mode (i.e., the first communication module 120).

[0066] Step 720: The grid connection point acquisition device 130 acquires the third operating parameters of the grid connection point and sends the third operating parameters to the energy dispatch module.

[0067] The third operating parameter includes, but is not limited to, current, voltage, frequency, active power, and reactive power.

[0068] In this embodiment, the grid connection point acquisition device 130 acquires the third operating parameters of the grid connection point, and can transmit the third operating parameters to the power equipment 210 or the first control unit 110 connected to the grid connection point acquisition device 130, and then transmit the third operating parameters to the energy dispatch module through wireless communication mode (i.e., the first communication module 120).

[0069] Step 730: The energy scheduling module generates a first control parameter based on at least one of the second and third operating parameters, and sends the first control parameter to the corresponding first control unit 110.

[0070] In this embodiment, the energy dispatch module collects the operating parameters of the power equipment 210 and / or grid connection points in the distributed power station, generates corresponding first control parameters according to the current operating mode of the distributed power station, and sends the first control parameters to the corresponding first control unit 110 through the first communication module 120.

[0071] In practice, the operating modes of distributed power stations include, but are not limited to, maximum self-consumption mode (meeting local load demand), grid connection point power factor control, remote dispatch mode, and peak shaving control mode (based on economic efficiency).

[0072] In this embodiment, the first control parameter includes, but is not limited to, parameters such as total power command, total power upper limit, and total power lower limit. The total command power is the power target value for the operation of the power equipment 210, which is related to the operating mode. The total power upper limit is the upper limit of the total output power obtained by constraining the reverse current power at the grid connection point. The total power lower limit is the lower limit of the total output power obtained by constraining the power consumption at the grid connection point.

[0073] In actual operation, the energy dispatch module can standardize the power control parameters to obtain power control item per-unit values ​​such as power command per-unit value, power upper limit per-unit value, and power lower limit per-unit value, and send these power control item per-unit values ​​to the first control unit 110.

[0074] Understandably, for distributed power stations that include energy storage devices, the energy dispatch module can obtain parameters such as the total rated capacity of energy storage at the station level, the total charging and discharging power of energy storage (divided into charging power and discharging power), the total discharging power of energy storage, and the comprehensive state of charge based on the energy storage-related parameters uploaded by each power area 201. The energy dispatch module can also normalize the total charging and discharging power of energy storage according to the current total energy storage capacity to obtain the charging and discharging power per unit capacity, which is then sent to the first control unit 110 as the energy storage adjustment benchmark. That is, the first control parameter includes the energy storage adjustment benchmark.

[0075] Step 740: The first control unit 110 generates second control parameters based on the first control parameters and sends the second control parameters to the corresponding power equipment 210.

[0076] In this embodiment, the first control unit 110 obtains the first control parameters issued by the energy scheduling module, processes them to generate the second control parameters for each power device 210, and sends the second control parameters to the corresponding power device 210 so that the power device 210 can perform control according to the second control parameters.

[0077] For example, the power equipment 210 obtains the per-unit value of the power control item and the energy storage adjustment reference quantity issued by the first control unit 110. Based on its own rated power and energy storage working status, it restores them to the local equipment power command, power upper limit, power lower limit and energy storage charging and discharging power expectation value, and inputs them to the corresponding control loops respectively. While responding to the scheduling of the energy scheduling module, it helps to maintain the balance of the state of charge.

[0078] Understandably, the first control unit 110 forwards the per-unit value of the power control item to the power generation equipment 210 (such as the inverter 214, converter 211, etc.) and forwards the energy storage regulation reference quantity to the energy storage equipment 210.

[0079] According to the control method provided in the embodiments of this application, the first control unit 110 and the grid connection point acquisition device 130 feed back operating parameters to the energy dispatching module through the first communication module 120. The energy dispatching module sends control parameters to each power equipment 210 through the first communication module 120 and the first control unit 110. Regional data aggregation and command forwarding are realized through wireless communication. While maintaining the rapid response of energy dispatching in the distributed power station, the deployment of medium and long distance communication lines in the distributed power station is reduced, effectively reducing construction complexity and cost.

[0080] In some embodiments, a heartbeat mechanism is established between the energy dispatch module and the first control unit 110 to sense the online status of each power area 201, adjust the energy dispatch strategy of the distributed power station in real time, and ensure that the feedback of operating parameters and the distribution of control parameters are synchronized by transmitting heartbeat frames.

[0081] For example, the energy scheduling module sends heartbeat frames to the first control unit 110 at regular intervals; after receiving the heartbeat frame, the first control unit 110 determines that the energy scheduling module is in a normal communication state and replies with a heartbeat frame to the energy scheduling module; if the first control unit 110 does not receive the heartbeat frame sent by the energy scheduling module for several consecutive cycles, it determines that the energy scheduling module is in a communication abnormal state.

[0082] Understandably, after the energy scheduling module receives a heartbeat frame from the first control unit 110, it determines that the first control unit 110 is online; if the energy scheduling module does not receive a heartbeat frame from the first control unit 110 for several consecutive cycles, it determines that the first control unit 110 is offline.

[0083] In some embodiments, the status of communication between the energy scheduling module and the first control unit 110 is determined based on the serial number of the data frame transmitted between the energy scheduling module and the first control unit 110.

[0084] In this embodiment, the energy scheduling module and the first control unit 110 communicate according to a period T. The energy scheduling module sends a data frame with a serial number to the first control unit 110 every time interval T via wireless communication. The first control unit 110 replies to the energy scheduling module with a data frame with a serial number via wireless communication.

[0085] The energy dispatch module in t n The serial number of the data frame sent at each time is S n After the data frame is sent, the energy scheduling module updates the serial number to S. n+1 The first control unit 110 in t n Received serial number S at any time n The data frame will update the serial number to S. n+1 and serial number S n+1 The data frames are sent back to the energy dispatch module via wireless communication.

[0086] The energy dispatch module in t n+1 Time (t) n+1 =t n +T), determine the previous time t n Does the serial number returned by the first control unit 110 match the time t? n+1serial number S n+1 If they match, the energy scheduling module determines that the communication of the first control unit 110 is normal; if they do not match, the energy scheduling module calculates time t. n The serial number returned by the first control unit 110 and the serial number S updated by the energy dispatch module n+1 If the difference between the serial numbers is greater than a preset threshold, the energy scheduling module determines that the communication of the first control unit 110 is abnormal.

[0087] In actual operation, when the communication between the first control unit 110 of a power area 201 and the energy dispatch module is abnormal, the energy dispatch module can perform energy dispatch according to the operating parameters of the currently controllable area.

[0088] Among them, the power area 201 where the communication between the first control unit 110 and the energy dispatch module is normal can be referred to as the first power area, and the power area 201 where the communication between the first control unit 110 and the energy dispatch module is abnormal can be referred to as the second power area.

[0089] In some embodiments, the control method may further include: When the number of first power zones is greater than or equal to a preset threshold, the energy dispatch module performs energy dispatch for each first power zone based on the second operating parameters of each first power zone.

[0090] In this embodiment, if the number of first power zones with normal communication is not less than a preset threshold, it is determined that the power station energy dispatch can continue to be executed, and subsequent energy dispatch control is carried out based on the second operating parameters of each first power zone.

[0091] In other embodiments, the control method may further include: If the number of units in the first power zone is less than a preset threshold, the energy dispatch module outputs an alarm message to indicate an abnormal communication situation at the distributed power station.

[0092] In this embodiment, if the number of first power areas with normal communication is less than a preset threshold, the power station energy dispatching will be stopped. The energy dispatching module will output alarm information to remind relevant staff that there is a serious communication anomaly at the distributed power station and that the power station energy dispatching has been suspended.

[0093] Understandably, different energy scheduling strategies can be selected based on the communication status between the energy scheduling module and the grid connection point acquisition device 130.

[0094] In some embodiments, energy dispatching for each first power region may include: When communication between the energy dispatch module and the grid connection point acquisition device 130 is normal, the energy dispatch module performs energy dispatch according to the closed-loop control strategy based on the second operating parameters of each first power area and the third operating parameters sent by the grid connection point acquisition device 130.

[0095] In other embodiments, energy scheduling for each first power zone may include: in the event of a communication failure between the energy scheduling module and the grid connection point acquisition device 130, the energy scheduling module performs energy scheduling based on the second operating parameters of each first power zone according to an open-loop control strategy.

[0096] Understandably, the closed-loop control strategy uses the third operating parameter of the grid connection point as a real-time feedback input to form a closed-loop regulation loop. The energy dispatch module dynamically corrects the power command based on the deviation of the operating parameter, and then transmits it to the first control unit 110 through wireless communication. It has a fast response and high accuracy, realizing bidirectional power controllability and power quality optimization.

[0097] Under the open-loop control strategy, the energy dispatch module cannot receive feedback from the grid connection point. It generates corresponding power commands based on the second operating parameters of the existing first power area to maintain power balance and voltage stability within the area. After the communication between the grid connection point acquisition device 130 and the energy dispatch module is restored, it can switch back to the closed-loop control strategy.

[0098] It is understandable that the second power zone has a first control unit 110. The second power zone can be an independent system for its own energy scheduling, and can also perform protection actions such as shutdown based on the duration of communication interruption with the energy scheduling module.

[0099] In some embodiments, the control method may further include: The first control unit 110 of the second power zone performs energy dispatching for the second power zone based on its own second operating parameters.

[0100] In this embodiment, the second power area acts as an independent system for its own energy scheduling. The first control unit 110 collects the first operating parameters of each power device 210 in the second power area, generates the second operating parameters, and generates power commands for each power device 210 based on its own second operating parameters and preset control modes (such as maximum self-generation and self-consumption, grid connection point power factor control, remote scheduling, peak shaving control, etc.) to perform energy scheduling for the second power area.

[0101] In other embodiments, the control method may further include: The first control unit 110 of the second power zone controls the power equipment 210 of the second power zone to shut down.

[0102] In this embodiment, when the shutdown protection action is performed, the first control unit 110 determines that the communication between the first control unit and the energy dispatch module is abnormal. The first control unit 110 controls the power equipment 210 in the second power area to shut down. After the communication is restored, the first control unit 110 controls the power equipment 210 to restart.

[0103] In actual operation, when the communication between the first control unit 110 and the energy dispatch module is disconnected, the first control unit 110 starts timing the communication interruption duration. When the communication interruption duration exceeds the preset duration threshold, the power equipment 210 in the second power area is then controlled to shut down, reducing the probability of frequent equipment start-ups and shutdowns due to communication instability and minimizing the adverse effects on equipment lifespan and system stability.

[0104] In some embodiments, energy dispatching of the second power zone may include: When communication between the first control unit 110 of the second power zone and the grid connection point acquisition device 130 is normal, the first control unit 110 of the second power zone performs energy scheduling according to the closed-loop control strategy based on its own second operating parameters and the third operating parameters sent by the grid connection point acquisition device 130.

[0105] In other embodiments, energy dispatching of the second power zone may further include: In the event of a communication failure between the first control unit 110 of the second power zone and the grid connection point acquisition device 130, the first control unit 110 of the second power zone performs energy scheduling based on its own second operating parameters and in accordance with an open-loop control strategy.

[0106] It should be noted that when the grid connection point acquisition device 130 is connected to the first control unit 110 or the power equipment 210 of the second power area, the first control unit 110 can directly or indirectly obtain the third operating parameters collected by the grid connection point acquisition device 130.

[0107] For the first control unit 110 of the second power zone, the closed-loop control strategy uses the third operating parameter of the grid connection point as the real-time feedback input to form a closed-loop adjustment loop. The first control unit 110 dynamically corrects the power command according to the deviation of the operating parameter, so as to realize bidirectional controllability of power between the independent zone and the power grid and the optimization of power quality.

[0108] Under the open-loop control strategy, the first control unit 110 cannot receive feedback from the grid connection point and generates corresponding power commands based on the second operating parameters of its own equipment in order to maintain power balance and voltage stability within the region.

[0109] It should be noted that the energy dispatch module can perform energy dispatch on the first power area in the distributed power station according to the open-loop control strategy; the first control unit 110 of the second power area can perform energy dispatch on the power equipment 210 of the second power area according to the open-loop control strategy.

[0110] In some embodiments, the open-loop control strategy includes: using zero power as the output power reference value, using the allowable reverse current power at the grid connection point as the upper limit of the output power, and using the allowable power consumption at the grid connection point as the lower limit of the output power.

[0111] It is understandable that open-loop control strategy is an energy dispatch strategy without grid connection point power feedback.

[0112] In this embodiment, for the energy dispatch module, zero power is used as the output power reference value (i.e., output power command), the grid connection point allows reverse flow power as the upper limit of the total output power of the power station, and the grid connection point allows power consumption as the lower limit of the total output power of the power station. Combined with the energy storage status, power generation status, etc. of the distributed power station, the output of each power area 201 in the distributed power station is adjusted.

[0113] For the first control unit 110, zero power is used as the output power reference value, the allowed reverse current power at the grid connection point is used as the upper limit of the total output power of the area, and the allowed power consumption at the grid connection point is used as the lower limit of the total output power of the area. The corresponding power command is sent to each power device 210. The power device 210 adjusts its own output based on its own energy storage status, power generation status, etc.

[0114] In actual implementation, whether the energy dispatch module and the first control unit 110 adopt an open-loop control strategy or perform shutdown protection is a configurable setting.

[0115] When the distributed power station operates in closed-loop mode, the energy dispatch module and the first control unit 110 can adopt a closed-loop control strategy; when the distributed power station operates in open-loop mode, the energy dispatch module and the first control unit 110 can adopt an open-loop control strategy.

[0116] In some embodiments, the control method may further include: When the distributed power station is operating in closed-loop mode, in response to a communication anomaly with the grid connection point acquisition device 130, the energy dispatch module outputs a shutdown command to each first control unit 110, or switches the operating mode of the distributed power station to open-loop mode.

[0117] In this embodiment, the energy scheduling module adopts a closed-loop control strategy for energy scheduling and monitors the communication status of the grid connection point acquisition device 130 in real time. When the communication between the energy scheduling module and the grid connection point acquisition device 130 is normal, the grid connection point anti-backflow control is performed based on the operating parameters fed back by the grid connection point acquisition device 130. If the communication between the energy scheduling module and the grid connection point acquisition device 130 is abnormal, the link break protection is performed. The protection action can be shutdown protection or open-loop control.

[0118] For example, in response to a communication failure with the grid connection point acquisition device 130, the energy dispatch module outputs a shutdown command to each first control unit 110, and the first control unit 110 then forwards the shutdown command to each power device 210 to perform shutdown protection actions.

[0119] For example, in response to a communication anomaly with the grid connection point acquisition device 130, the energy dispatch module switches the operation mode of the distributed power station to open-loop mode. Based on the second operating parameters of each power area 201, the energy dispatch module performs energy dispatch according to the open-loop control strategy.

[0120] In some embodiments, the control method may further include: When the distributed power station is operating in open-loop mode, in response to a communication failure with the energy dispatch module, the first control unit 110 controls the power equipment 210 of the power area 201 to shut down, or sends a second control parameter to the corresponding power equipment 210 based on the historical first control parameter.

[0121] It is understandable that if the communication between the first control unit 110 of a certain power area 201 and the energy dispatch module is abnormal, the power area 201 will enter a disconnection state, and the disconnection protection function of the first control unit 110 will be triggered. The protection action can be shutdown protection or power limiting protection.

[0122] For example, in response to a communication failure with the energy dispatch module, the first control unit 110 outputs a shutdown command to each power device 210 in the power area 201, controlling the power device 210 to perform a shutdown protection action.

[0123] For example, in response to a communication anomaly with the energy dispatch module, the first control unit 110 sends corresponding second control parameters to each power device 210 based on the first control parameters previously received, and performs power limiting protection.

[0124] In actual implementation, the historical first control parameter used by the first control unit 110 when performing chain break protection can be either the value received in the previous communication cycle or any valid value received in the most recent few communication cycles.

[0125] It should be noted that the historical first control parameters include power boundary values ​​generated based on the effective electrical constraints of the grid connection point. After the communication is interrupted, the first control unit 110 uses these historical limits (such as the power command received in the previous communication cycle, the upper power limit and the lower power limit, etc.), which helps to keep the output of the power equipment 210 within the safe range and reduce the risk of system over-limit in the power disconnection area 201.

[0126] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0127] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the related technology, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0128] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0129] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0130] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A communication system for distributed power plants, characterized in that, The distributed power station has at least two power zones, each power zone is equipped with power equipment, and the communication system includes: At least two first control units, each of which corresponds to a power zone, and each of the first control units is communicatively connected to the power equipment within the power zone; At least two first communication modules, each corresponding to a first control unit, are communicatively connected to the first control unit or the power equipment. The first communication modules of the at least two power areas establish a wireless communication connection with the energy dispatch module of the distributed power station. A grid connection point acquisition device is communicatively connected to the power equipment or the first control unit, and the grid connection point acquisition device is used to collect the operating parameters of the grid connection point of the distributed power station.

2. The communication system for distributed power stations according to claim 1, characterized in that, The first control unit is located in one of the power devices within the power area; Alternatively, the first control unit may be a controller independent of the power equipment, and the first control unit may establish a wired or wireless communication connection with the power equipment.

3. The communication system for distributed power stations according to claim 1 or 2, characterized in that, The first communication module is located in one of the power devices within the power area; Alternatively, the first communication module may be a communication module independent of the power equipment.

4. The communication system for distributed power stations according to claim 1 or 2, characterized in that, The grid connection point acquisition device is connected to the power equipment or the first control unit within a preset distance range via a communication cable.

5. A control method, characterized in that, The method is used in the communication system for distributed power stations according to any one of claims 1-4, the method comprising: The first control unit acquires the first operating parameters of the power equipment in the power area and sends the second operating parameters of the power area to the energy dispatch module. The second operating parameters are determined based on the first operating parameters of each of the power equipment in the power area. The grid connection point acquisition device acquires the third operating parameters of the grid connection point and sends the third operating parameters to the energy scheduling module. The energy scheduling module generates a first control parameter based on at least one of the second operating parameter and the third operating parameter, and sends the first control parameter to the corresponding first control unit; The first control unit generates a second control parameter based on the first control parameter, and sends the second control parameter to the corresponding power equipment.

6. The control method according to claim 5, characterized in that, The method further includes: When the number of first power zones is greater than or equal to a preset threshold, the energy scheduling module performs energy scheduling for each first power zone based on the second operating parameters of each first power zone, and the communication between the first control unit of the first power zone and the energy scheduling module is normal. Alternatively, if the number of the first power zones is less than the preset threshold, the energy scheduling module outputs an alarm message to indicate a communication anomaly at the distributed power station.

7. The control method according to claim 6, characterized in that, Energy dispatching for each of the first power zones includes: When the communication between the energy dispatch module and the grid connection point acquisition device is normal, the energy dispatch module performs energy dispatch according to the closed-loop control strategy based on the second operating parameters of each first power area and the third operating parameters sent by the grid connection point acquisition device. Alternatively, in the event of a communication failure between the energy dispatch module and the grid connection point acquisition device, the energy dispatch module performs energy dispatch based on the second operating parameters of each of the first power regions, following an open-loop control strategy.

8. The control method according to claim 7, characterized in that, The open-loop control strategy includes: using zero power as the output power reference value, using the allowable reverse current power at the grid connection point as the upper limit of the output power, and using the allowable power consumption at the grid connection point as the lower limit of the output power.

9. The control method according to any one of claims 5-8, characterized in that, The method further includes: When the distributed power station is operating in closed-loop mode, in response to a communication failure with the grid connection point acquisition device, the energy dispatch module outputs a shutdown command to each of the first control units, or switches the operating mode of the distributed power station to open-loop mode.

10. The control method according to any one of claims 5-8, characterized in that, The method further includes: When the distributed power station is operating in open-loop mode, in response to a communication failure with the energy dispatch module, the first control unit controls the power equipment in the power area to shut down, or sends the second control parameters to the corresponding power equipment based on the historical first control parameters.

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