Group dispatching and group control system based on energy storage system PCS

Abstract

The invention provides a group dispatching and group control system based on an energy storage system PCS, the system is provided with a dispatching center, a group dispatching and group control device and a data communication gateway machine, the dispatching center adopts a multi-protocol operation control system, and the group dispatching and group control device adopts a group dispatching and group control mechanism according to power grid requirements and working targets of an energy storage power station. The operation state of the PCS equipment is scheduled and optimized in a centralized manner; the data communication gateway machine realizes protocol conversion, data management and instruction distribution; the communication between the dispatching center and the group dispatching and group control device adopts a 104 protocol and an MQTT protocol; the communication between the data communication gateway machine and the energy storage system PCS adopts IEC 61850 and Modbus protocols; the system realizes seamless integration and cooperative work of different communication protocols in an energy storage system, supports efficient and unified scheduling and control of a plurality of PCS devices, greatly improves the adaptability and flexibility of the system, and meets the requirements of future large-scale energy storage application.

Description

Technical Field

[0001] The present invention relates to the field of PCS multi-protocol communication technology, and in particular to a group dispatching and controlling system based on an energy storage system PCS. Background Art

[0002] With the continuous expansion of renewable energy power generation and the expansion of distributed power sources in the power system, energy storage technology, as an important component of smart grids, has developed rapidly. Energy storage systems play an indispensable role in smart grids and can provide effective support in peak shaving, valley filling, frequency regulation and voltage regulation. Especially in the face of the volatility and uncertainty of renewable energy power generation, energy storage systems can provide active and reactive support to enhance the grid's ability to accept distributed power sources and further improve the grid's stability and reliability.

[0003] In large-capacity energy storage power stations, the power storage converter (PCS) is the core equipment responsible for realizing the bidirectional energy conversion and control between the energy storage system and the power grid. With the increase in the scale of energy storage systems, the number of PCS in energy storage power stations has increased significantly, and efficient and synchronous control of multiple PCS devices has become the key to energy storage system scheduling. However, most of the current PCS controls rely on a separate sequential control method, that is, each PCS device receives and executes control instructions in turn. Although this method has high reliability, it inevitably prolongs the response time in the process of multiple PCSs executing commands one by one, resulting in a trapezoidal increase in power output and the inability to quickly achieve full-load power output. In addition, the traditional PCS control system has a complex structure, and each PCS device is often managed using different communication protocols. The lack of uniformity in time has caused the complexity of system scheduling, configuration and maintenance; and in order to achieve efficient synchronous control of the entire energy storage power station, a large number of joint debugging operations are required before it is put into operation, which not only increases the engineering difficulty, but also significantly increases the operation and maintenance costs; for this reason, the applicant has proposed a multi-protocol group dispatching and group control system based on the energy storage system PCS. The system takes group control as the core, uses multi-protocol conversion technology to achieve unified management of different protocols, and realizes high-synchronization concurrent control of multiple PCS devices, thereby effectively improving the overall control efficiency and response speed of the energy storage power station; through this system, the time delay of each control can be reduced and the coexistence of multiple protocols can be supported at the same time, so as to realize the rapid power response and output stability of the energy storage system, improve the expansion and extension of the energy storage system, and further improve the regulation capability of the power grid and the operation efficiency of the energy storage system. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a group dispatching and group control system based on the PCS energy storage system. The system is equipped with a dispatching center, a group dispatching and group control device and a data communication gateway. The dispatching center adopts a multi-protocol operation control system, and the group dispatching and group control device adopts a group dispatching and group control mechanism to centrally dispatch and optimize the operating status of PCS equipment according to the power grid demand and the working objectives of the energy storage power station; the data communication gateway realizes protocol conversion, data management and instruction distribution; the system realizes seamless integration and collaborative work of different communication protocols in the energy storage system, supports efficient and unified dispatching and control of multiple PCS devices, greatly improves the adaptability and flexibility of the system, and meets the needs of future large-scale energy storage applications.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A group dispatching and group control system based on an energy storage system PCS, the group dispatching and group control system based on the energy storage system PCS is provided with a dispatching center, a group dispatching and group control device and a data communication gateway; the dispatching center adopts a multi-protocol operation control system and supports multiple communication protocols; each protocol has a different transmission mode and data structure, so that the system can flexibly perform data communication according to the needs of the PCS and the protocol requirements; the group dispatching and group control device adopts a group dispatching and group control mechanism to centrally dispatch and optimize the operating status of the PCS equipment according to the power grid needs and the working objectives of the energy storage power station, and the group dispatching and group control device comprehensively considers the power demand of the energy storage system and the status of each PCS, generates a global power output or voltage adjustment strategy, realizes the synchronous control of multiple PCSs, and ensures that all PCS devices can receive the same instructions within the specified time and complete the control operation as required; the data communication gateway realizes protocol conversion, data management and instruction distribution, receives and parses control instructions from the upper system, and converts them into IEC 61850 or Modbus protocols, so as to adapt to the communication requirements of different PCS devices; Furthermore, the communication between the dispatching center and the group dispatching and group control devices of the group dispatching and group control system based on the energy storage system PCS adopts the 104 protocol and the MQTT protocol, so that the two protocols can exist simultaneously and work together.

[0006] Furthermore, the data communication gateway of the group dispatching and group control system based on the energy storage system PCS communicates with the energy storage system PCS using IEC 61850 and Modbus protocols, so that the two protocols can coexist and work together.

[0007] The benefits of this application are: 1. The group dispatching and control system based on the energy storage system PCS can realize the simultaneous integration and mutual cooperation of PCS devices with different protocols, meet the needs of the energy storage system in complex communication scenarios, and have strong compatibility; 2. The multi-protocol system of the group dispatching and group control system based on the energy storage system PCS supports fast command issuance and status feedback, effectively improving the response speed and operation reliability of the energy storage system; 3. The group dispatching and control system based on the energy storage system PCS supports the parallel operation of different protocols, providing flexible expansion space for the addition of new PCS equipment in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall architecture of the system of the present invention; Figure 2 This is a schematic diagram of the monitoring process of the present invention; Figure 3 The figure is a flow chart of the group dispatching and group control mechanism of the present invention. DETAILED DESCRIPTION

[0009] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: like Figure 1-3 As shown, a group dispatching and group control system based on the energy storage system PCS is provided with a dispatching center, a group dispatching and group control device and a data communication gateway; the dispatching center adopts a multi-protocol operation control system and supports multiple communication protocols; each protocol has a different transmission mode and data structure, so that the system can flexibly perform data communication according to the needs of the PCS and the protocol requirements; the group dispatching and group control device adopts a group dispatching and group control mechanism to centrally dispatch and optimize the operating status of the PCS equipment according to the power grid demand and the working objectives of the energy storage power station. The group dispatching and group control device comprehensively considers the power demand of the energy storage system and the status of each PCS, generates a global power output or voltage adjustment strategy, realizes the synchronous control of multiple PCSs, and ensures that all PCS devices can receive the same instructions within the specified time and complete the control operation as required; the data communication gateway realizes protocol conversion, data management and instruction distribution, receives and parses control instructions from the upper system, and converts them into IEC 61850 or Modbus protocol, so as to adapt to the communication requirements of different PCS equipment; the communication between the dispatching center and the group dispatching and group control devices of the group dispatching and group control system based on the energy storage system PCS shown adopts 104 protocol and MQTT protocol, so as to realize the coexistence and collaborative work of the two protocols; the communication between the data communication gateway of the group dispatching and group control system based on the energy storage system PCS and the energy storage system PCS shown adopts IEC 61850 and Modbus protocol, so as to realize the coexistence and collaborative work of the two protocols.

[0010] Specific as Figure 1As shown, the power grid dispatching center is responsible for the overall dispatching control, and communicates with the group dispatching and group control devices through the 104 protocol and the MQTT protocol; the group dispatching and group control devices serve as the intermediate control layer to realize the group dispatching and group control operations of multiple PCS devices, receive the instructions of the dispatching center and forward them to the data communication gateway, and feedback the status of the PCS at the same time; the data communication gateway communicates with each PCS device through the IEC 61850 and Modbus protocols, receives the instructions of the group dispatching and group control devices and forwards them to each PCS device; the PCS device is used to respond to control instructions and perform power regulation, status update and other operations; The communication process between the power grid dispatching and the group dispatching and group control device based on the 104 protocol and the MQTT protocol is shown as follows: The power grid dispatching center sends a power dispatching instruction to the group dispatching and group control device. The instruction content includes the target power, time requirements and system status indication. After receiving the instruction, the group dispatching and group control device generates an optimized dispatching plan according to the system requirements. At this time, the 104 protocol is responsible for real-time transmission of monitoring data and alarm information to ensure that the system remains stable during the dispatching process. The MQTT protocol's publish / subscribe mechanism is used to push status feedback and alarm information to the dispatching center to ensure that the dispatching center has real-time knowledge of the operating status of each PCS. The main process is: 104 protocol communication algorithm: The device communicates via the 104 protocol, regularly sending control instructions, receiving status data, and providing feedback in case of failure; the algorithm keeps the program running through an infinite loop to continue 104 protocol communication; Check the 104 protocol connection status: In each cycle, first check whether the connection of 104 protocol is established, which is the premise to ensure the normal communication of the subsequent communication; if the connection is normal, call the function to send the control instruction; the control instruction can be the operation command of turning on / off the device, adjusting the device settings, etc., and the specific content is defined according to the requirements; Receive 104 status data: Call the function to receive status data from the device. This data usually includes the device's operating status, alarm information, operation results, etc. This step is used to obtain the real-time status of the device for subsequent processing and feedback.

[0011] Check the fault status: Use the function to check whether the received status data contains fault information. If there is a fault, it means that the device has encountered an abnormality and needs further processing.

[0012] Send 104 fault feedback: If a fault is detected, a function is called to send fault feedback to the system or control center; fault feedback is used to notify system administrators or other devices that the device has encountered a problem and may need to be repaired or adjusted; MQTT protocol communication algorithm: Communicate with devices via the MQTT protocol, including subscribing to status information, issuing control commands, and processing status changes; Check the MQTT connection status: First, check whether the MQTT protocol connection has been established. If the MQTT connection is not established, subsequent communication will not be possible. Subscribe to device status information: If the connection is normal, call to subscribe to the device status topic, assuming that this is the topic where the device or system sends device status updates; after subscription, the system can receive the status data sent by the device and update the control panel or take corresponding measures accordingly.

[0013] Issue control commands: Calling subscription publishes control commands to the topic. The control data sent is usually an operation command for the device, such as switch operation or other control instructions. The command will be sent to the recipient who has subscribed to the topic. Receive MQTT status changes: If the state of the device or system changes, the system detects whether a message of the state change is received through the state detection. If a message of the state change is received, such as a change in the device state or working mode, the system proceeds to the next step. Display status changes: If a status change message is received, the function is called to display the status change information on the control panel, including the device's operating status, fault information, operation results, etc., to help users monitor the device's working status in real time; Data synchronization algorithm: This algorithm is used to synchronize data in the system to ensure data consistency and timeliness between devices or systems; Use the function to determine whether data synchronization is required, which is usually based on time intervals, system status, or external trigger events. If True is returned, data synchronization is required and the system will enter the synchronization process.

[0014] Send a synchronous command: If data synchronization is required, call the function to send periodic synchronization commands. This command is used to trigger data synchronization between devices or systems to ensure that data remains consistent between devices. It usually includes operations such as time synchronization and data consistency check.

[0015] Check and retry unsynchronized PCS: Call the function to check if any PCS (which may be a "power control system" or similar device) has not been successfully synchronized. If any device is found to have failed to synchronize, the function will try to retry the synchronization operation to ensure that the data of all devices can be synchronized to the latest status; In summary, the 104 protocol communication algorithm realizes two-way communication with the device through the 104 protocol, ensuring that control instructions can be sent and the status data of the device can be received, and feedback processing can be performed when a fault occurs; the MQTT protocol is used to subscribe to the status information of the device and issue control commands, and the status changes of the device are received and displayed in real time, which is convenient for remote monitoring and control; the data synchronization algorithm synchronizes data between multiple devices or systems to ensure data consistency in the system, and retries when synchronization fails to ensure stable operation of the system; the algorithms work together to support multi-protocol communication and data synchronization in the system, ensuring the real-time, reliability and consistency of the equipment and system. This dual-protocol mechanism improves communication efficiency and realizes reliable communication between power grid dispatching and group dispatching and group control devices; The communication process between the data communication gateway and PCS based on IEC 61850 and Modbus protocol is shown as follows: After the group dispatch and group control device issues specific dispatch instructions, the data communication gateway receives these instructions and performs protocol conversion, and selects IEC 61850 or Modbus protocol to send instructions according to the communication protocol of the PCS equipment; for PCS using IEC61850 protocol, the gateway will encapsulate the instructions into messages that comply with the IEC 61850 standard, quickly transmit them, and perform fault monitoring and status query through logical nodes; for PCS using Modbus protocol, the gateway will transmit the instructions through TCP or RTU, write them into the control register according to the Modbus address table, and implement control operations such as power adjustment; The main process is as follows: Scheduling based on protocol type: Determine the protocol type: At the beginning of the algorithm, the currently selected protocol type will be checked first. Depending on the protocol type, different communication protocols will be used for subsequent operations. The core is to determine the current protocol type and perform corresponding instruction conversion, sending and response processing for each protocol, such as IEC 61850 or Modbus. IEC 61850 protocol flow: If the protocol type is IEC 61850, perform the following steps according to the IEC 61850 standard: Prepare IEC 61850 messages: Call the function to generate a message that complies with the IEC 61850 protocol format based on the device ID, operation type (such as switch, read, write, etc.) and target value (such as the parameter or status of the control command). This step converts the upper-layer control command into the format required by the IEC 61850 protocol to ensure that the information can be correctly understood by the device supported by the IEC 61850 protocol. Sending IEC 61850 messages: Use the function to send the IEC 61850 message generated above to the target device. Here, the id identifies the specific device that needs to be controlled or read. The message sent usually contains control instructions, device status query requests or other commands, depending on the operation type and target value; Receiving IEC 61850 response: The calling function waits for the target device to return a response. This may be status feedback, confirmation message or error information after the device executes the command. The response can be the device's status information, feedback on whether the operation is successful, or error information in abnormal circumstances; Update the control panel: Based on the received IEC 61850 protocol response, call a function to update the status or information on the system control panel, which includes displaying the current status, operation results or fault information of the device so that the user can understand the real-time situation of the device; Modbus protocol process: If the protocol type is Modbus, perform the following steps: Prepare Modbus message: Call the function to generate a message in the Modbus protocol format according to the device ID, operation type (such as read and write registers, input and output status) and target value. The Modbus protocol uses different function codes to identify the operation type, so the corresponding function code, address, data and other parameters are generated according to the operation type; Sending a Modbus message: Use the function to send the Modbus message generated above to the target device. The message format here usually contains the address, function code, data value and other information of the target device. The Modbus protocol will send this information to the device through the serial port, TCP or other transmission methods; Receive Modbus response: Call the function to wait for the response from the Modbus device. The response of the Modbus protocol generally includes a confirmation message to indicate whether the operation is successful. It may also return the read data or an error code if an error occurs. Update the control panel: Use functions to update the information on the system control panel according to the received Modbus response. The response information includes the device's operation results, error codes, or read data. This information will help users determine the current status of the device. In summary, the subsequent processing flow is determined according to the protocol type (such as IEC 61850 or Modbus) to ensure that the instructions of different protocols can be correctly converted, sent and processed; each protocol has a different message format, and the algorithm will convert the instructions into the corresponding message format according to the protocol type. For example, the message structure of IEC 61850 and Modbus is completely different, so they need to be processed separately. For each protocol, the instruction will be sent to the target device, and then wait for the device to return a response; this step is the core of protocol communication, ensuring that the instruction is successfully executed and feedback is obtained; according to the feedback information of the device, the system will update the data on the control panel in real time to ensure that the operation status is visualized and reflected in the user interface in real time; the design of this algorithm enables the system to flexibly process instructions and responses according to different protocol types, and support the parallel operation of multiple industrial communication protocols. The multi-protocol module of the data communication gateway can process different protocols at the same time, ensuring that different PCS devices can synchronously receive instructions and complete instruction execution.

[0016] like Figure 2 The figure shows the monitoring process of the multi-protocol group dispatching and group control system based on the energy storage system PCS. The data communication gateway and the group dispatching and group control device continuously monitor the operating status of the PCS equipment. If an abnormality is detected, the gateway will upload the alarm information to the dispatch center in real time through the 104 or MQTT protocol; the dispatch center will decide whether to trigger an emergency shutdown or adjust the power output based on the alarm information; the group dispatching and group control device will synchronously send adjustment commands to the PCS equipment after receiving the instructions to ensure rapid isolation of the fault and prevent it from affecting the stability of the system.

[0017] Figure 3 As shown, the group dispatching and group control mechanism process of the multi-protocol group dispatching and group control system based on the energy storage system PCS is described. The group dispatching and group control device generates a unified power output strategy based on the power demand of the dispatching center and the real-time status of each PCS, including voltage, current and SOC; this strategy will balance the output of each PCS to ensure that the output power of the entire energy storage system meets the dispatching requirements; the group dispatching and group control device sends control instructions to multiple PCSs synchronously within a specified time; the communication gateway machine transmits the instructions to the corresponding PCS through IEC 61850 or Modbus protocol respectively. All PCS devices receive instructions and execute operations in a short time to achieve power regulation or state switching; this parallel control can ensure rapid response of the system.

[0018] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A group dispatching and control system based on energy storage system PCS, characterized by: The group dispatching and group control system based on the energy storage system PCS is provided with a dispatching center, a group dispatching and group control device and a data communication gateway; the dispatching center adopts a multi-protocol operation control system and supports multiple communication protocols; each protocol has a different transmission mode and data structure, so that the system can flexibly perform data communication according to the needs of the PCS and the protocol requirements; the group dispatching and group control device adopts a group dispatching and group control mechanism to centrally dispatch and optimize the operating status of the PCS equipment according to the power grid needs and the working objectives of the energy storage power station. The group dispatching and group control device comprehensively considers the power demand of the energy storage system and the status of each PCS, generates a global power output or voltage adjustment strategy, realizes the synchronous control of multiple PCSs, and ensures that all PCS devices can receive the same instructions within the specified time and complete the control operation as required; the data communication gateway realizes protocol conversion, data management and instruction distribution, receives and parses control instructions from the upper system, and converts them into IEC 61850 or Modbus protocols, so as to adapt to the communication requirements of different PCS devices.

2. According to claim 1, a group dispatching and controlling system based on the energy storage system PCS is characterized in that: The communication between the dispatching center and the group dispatching and group control device of the group dispatching and group control system based on the energy storage system PCS adopts the 104 protocol and the MQTT protocol, so that the two protocols can exist simultaneously and work together.

3. According to claim 1, a group dispatching and controlling system based on the energy storage system PCS is characterized in that: The data communication gateway of the group dispatching and group control system based on the energy storage system PCS communicates with the energy storage system PCS using IEC 61850 and Modbus protocols, so that the two protocols can coexist and work together.

Images