A method and system for coordinated control of breaker selection and reclosing under load control scenarios

Abstract

This invention provides a method and system for coordinated control of circuit breaker selection and feedback in load control scenarios, belonging to the field of smart grid technology. The method includes: the master station sending a remote selection command containing the target circuit breaker and operation type to the field smart energy unit; the field smart energy unit determining whether the current opening / closing state of the target circuit breaker meets the operation type and feeding back the selection result to the master station; the master station sending a remote execution command to the field smart energy unit; the field smart energy unit performing feedback confirmation; the master station sending an execution confirmation instruction to the field smart energy unit; the field smart energy unit determining whether tripping control is allowed based on the status of the local soft pressure plate, and the local hard pressure plate physically blocking or releasing the output path of the output relay; when the local soft pressure plate allows tripping control and the local hard pressure plate releases it, a tripping drive signal is output. This method can improve the safety and power supply reliability of circuit breaker remote control operation and reduce the risk of erroneous tripping.

Description

Technical Field

[0001] This invention belongs to the field of smart grid technology, and in particular relates to a method and system for coordinated control of circuit breaker selection and back-calibration in load control scenarios. Background Technology

[0002] In the construction of new power systems, smart energy units, as terminal equipment of new power load management systems, are mainly deployed in the primary and secondary distribution rooms of dedicated transformer users. Dedicated transformer users refer to industrial or large-scale power users with dedicated transformers and high requirements for power supply continuity. These terminals typically handle branch load control and demand response, achieving load control through remote operation of circuit breakers. Their application scenarios involve a long-term coexistence of continuous operation, remote monitoring, and high reliability requirements.

[0003] In the aforementioned applications, the on-site conditions are complex, and the continuity of power consumption is crucial. Once fluctuations occur in the control link, it can easily manifest as unstable command execution rhythm, insufficient result confirmation, or untimely on-site status assessment. Especially in scenarios with rigid production loads, terminal malfunctions, inconsistent action results, or delayed control result assessments can directly affect equipment operation and production continuity, thereby increasing the risk of production stoppages and the pressure on operation and maintenance.

[0004] For these scenarios, existing terminals typically have locally installed soft circuit breakers. These soft circuit breakers are a power-saving measure that controls whether the tripping signal is allowed to be output via software commands, primarily used to reduce the probability of unexpected load shedding. Meanwhile, regarding remote control execution, the industry common practice is for the terminal to directly execute the remote control command issued by the master station to meet the timeliness requirements of remote control. This approach is applicable to general load management scenarios and can cover daily control needs.

[0005] However, in dedicated transformer user scenarios with higher requirements for safety and continuity, existing solutions are still limited by on-site operating conditions and control link stability: First, local power supply capability relies more on software status, and the stability of power supply effect is easily affected when encountering abnormal operating conditions; Second, the intermediate confirmation information in the remote control process is relatively limited, and the consistency and reliability of execution results are easily fluctuated when communication fluctuations, transmission errors, or terminal identification anomalies occur; Third, in the face of rigid load scenarios, existing control methods still need to balance reliability, accuracy, and scenario adaptability. Summary of the Invention

[0006] The purpose of this invention is to provide a method and system for coordinated control of circuit breaker selection and resetting in load control scenarios, which can improve the safety and power supply reliability of remote operation of circuit breakers in load control scenarios, reduce the risk of erroneous tripping, and improve the accuracy of control results.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for selective back-calibration coordinated control of circuit breakers in a load control scenario, the method comprising: The master station sends a remote control selection command containing the target circuit breaker and operation type to the on-site smart energy unit; After receiving the remote control selection command, the on-site smart energy unit determines whether the current opening and closing status of the target circuit breaker meets the operation type, and feeds back the selection result to the master station. After receiving the successful selection result, the master station sends a remote control execution command for the target circuit breaker and the operation type to the field smart energy unit; After receiving the remote control execution command, the on-site smart energy unit performs a back-calibration confirmation based on the consistency verification result between the remote control execution command and the remote control selection command, and feeds back the back-calibration confirmation result to the main station; After receiving the return-to-school confirmation result, the main station sends an execution confirmation command to the on-site smart energy unit; After receiving the execution confirmation command, the on-site smart energy unit, in response to the remote execution command, determines whether tripping control is allowed based on the status of the local soft pressure plate when the operation type is tripping. If tripping control is allowed, the local hard pressure plate physically blocks or allows the tripping drive signal output path of the output relay. When the local soft pressure plate allows tripping control and the local hard pressure plate allows the tripping drive signal output path, the output relay outputs a tripping drive signal to cause the target circuit breaker to perform a tripping action. When the local soft pressure plate prohibits tripping control or the local hard pressure plate physically blocks the tripping drive signal output path, a control result of no tripping is formed. When the operation type is closing, the target circuit breaker is controlled to perform a closing action.

[0008] Furthermore, before the master station sends a remote control selection command containing the target circuit breaker and operation type to the field smart energy unit, the method also includes: The main station conducts a session negotiation and status verification with the on-site smart energy unit; After the session negotiation status verification is passed, the on-site smart energy unit monitors the control loop access status and receives the remote control selection command after the control loop access status is normal. After the on-site smart energy unit receives the execution confirmation command, it also includes: The on-site smart energy unit monitors the opening and closing status of the target circuit breaker; The monitoring results of the opening and closing status of the target circuit breaker are fed back to the main station; The master station determines whether the remote control operation was successfully executed based on the operation type and the opening / closing status monitoring results.

[0009] Furthermore, the operation types include opening and closing. After receiving the remote control selection command, the on-site smart energy unit determines whether the current opening / closing status of the target circuit breaker satisfies the operation type by including the following steps: When the operation type is opening, if the target circuit breaker is in the closed state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type. When the operation type is closing, if the target circuit breaker is in the opening state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type.

[0010] Furthermore, the selection of collaborative control methods for returning to school also includes: After receiving the remote selection command, the on-site smart energy unit also verifies whether the target circuit breaker has been correctly connected to the control range of the current on-site smart energy unit, whether the control circuit corresponding to the target circuit breaker is in the connected state, and whether the current working state of the on-site smart energy unit is normal. When the verification passes, a successful selection result is sent back to the main station; If any verification fails, the system will send a message to the main station indicating the selection failure and the corresponding error reason.

[0011] Furthermore, the step of determining whether tripping control is allowed based on the local soft pressure plate status when the operation type is tripping, and physically blocking or allowing the tripping drive signal output path of the output relay by the local hard pressure plate when tripping control is allowed, includes: When the local soft circuit breaker is in power-protection mode, tripping control is prohibited; When the local soft pressure plate is in the de-energized state, tripping control is allowed; When tripping control is enabled and the local hard switch is in the activated state, the local hard switch physically blocks the tripping drive signal output path. When trip control is enabled and the local hard switch is in the deactivated state, the local hard switch releases the trip drive signal output path and allows the output relay to output the trip drive signal.

[0012] In a second aspect, the present invention provides a circuit breaker selection and calibration collaborative control system for load control scenarios, comprising: a master station and a field smart energy unit, wherein the field smart energy unit includes a soft pressure plate function, a hard pressure plate hardware and an output relay; The master station is used to send remote control selection commands containing the target circuit breaker and operation type to the field smart energy units; After receiving the remote control selection command, the on-site smart energy unit determines whether the current opening and closing status of the target circuit breaker meets the operation type and feeds back the selection result to the master station. The main station is also used to send remote control execution commands for the target circuit breaker and the operation type to the field smart energy unit after receiving the successful selection result; The on-site smart energy unit is also used to receive the remote execution command, perform back-calibration confirmation based on the consistency verification result between the remote execution command and the remote selection command, and feed back the back-calibration confirmation result to the main station; The main station is also used to send an execution confirmation command to the on-site smart energy unit after receiving the return-to-school confirmation result; The on-site smart energy unit is also used to, upon receiving the execution confirmation instruction, to execute the remote control command. When the operation type is tripping, it determines whether tripping control is allowed based on the status of the local soft pressure plate. If tripping control is allowed, the local hard pressure plate physically blocks or allows the tripping drive signal output path of the output relay. When the local soft pressure plate allows tripping control and the local hard pressure plate allows the tripping drive signal output path, the output relay outputs a tripping drive signal to cause the target circuit breaker to perform a tripping action. When the local soft pressure plate prohibits tripping control or the local hard pressure plate physically blocks the tripping drive signal output path, a control result of no tripping is formed. When the operation type is closing, it controls the target circuit breaker to perform a closing action.

[0013] Furthermore, the master station is also used to perform session negotiation status verification with the field smart energy unit before sending a remote control selection command containing the target circuit breaker and operation type to the field smart energy unit. The on-site smart energy unit is also used to monitor the control loop access status after the session negotiation status is verified, and to receive the remote control selection command after the control loop access status is normal. The on-site smart energy unit is also used to monitor the opening and closing status of the target circuit breaker after receiving the execution confirmation command; The monitoring results of the opening and closing status of the target circuit breaker are fed back to the main station; The master station is also used to determine whether the remote control operation was successfully executed based on the operation type and the opening / closing status monitoring results.

[0014] Furthermore, the operation types include opening and closing, and the field smart energy unit is also used for: When the operation type is opening, if the target circuit breaker is in the closed state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type. When the operation type is closing, if the target circuit breaker is in the opening state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type.

[0015] Furthermore, the field smart energy unit is also used to verify, after receiving the remote selection command, whether the target circuit breaker has been correctly connected to the control range of the current field smart energy unit, whether the control circuit corresponding to the target circuit breaker is in the connected state, and whether the current working state of the field smart energy unit is normal. When the verification passes, a successful selection result is sent back to the main station; If any verification fails, the system will send a message to the main station indicating the selection failure and the corresponding error reason.

[0016] Furthermore, the on-site intelligent energy unit is specifically used to prohibit tripping control when the local soft pressure plate is in a power-protected state; to allow tripping control when the local soft pressure plate is in a de-powered state; to physically block the tripping drive signal output path when tripping control is allowed and the local hard pressure plate is in an engaged state; and to allow the tripping drive signal output path when tripping control is allowed and the local hard pressure plate is in a de-energized state, and to allow the output relay to output a tripping drive signal.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a collaborative control method for circuit breaker selection and back-calibration in a load control scenario. The method involves the master station sequentially sending a remote selection command, a remote execution command, and an execution confirmation command. The on-site smart energy unit first determines whether the current opening / closing state of the target circuit breaker meets the operation type. Then, based on the consistency verification result of the remote execution command and the remote selection command, a back-calibration confirmation is performed. Finally, when the operation type is opening, the local soft pressure plate status determines whether opening control is allowed. If opening control is allowed, the local hard pressure plate physically blocks or allows the trip drive signal output path of the output relay. This method can form a control link connecting selection, confirmation, and execution during remote operation. Through the collaborative effect of the soft and hard pressure plates at both the logic permission and physical on / off levels, the safety and accuracy of circuit breaker remote operation are improved, and the risk of erroneous opening is reduced.

[0018] 2. The present invention provides a circuit breaker selection and back-calibration collaborative control method in a load control scenario. By verifying the session negotiation status before the master station sends the remote control selection command, and monitoring the access status of the control loop after the session negotiation status verification is passed, and further verifying whether the target circuit breaker has been correctly connected to the control range of the current smart energy unit, whether the control loop corresponding to the target circuit breaker is in the access state, and whether the current working state of the smart energy unit is normal after the field smart energy unit receives the remote control selection command, the access conditions and terminal operating conditions can be confirmed layer by layer before the remote control process enters the execution stage, thereby improving the reliability and adaptability of the circuit breaker remote control process in a load control scenario.

[0019] 3. The present invention provides a method for coordinated control of circuit breaker selection and feedback in a load control scenario. After receiving an execution confirmation command from the on-site smart energy unit, when the operation type is tripping, the method determines whether tripping control is allowed based on the status of the local soft pressure plate. When tripping control is allowed, the local hard pressure plate physically blocks or allows the tripping drive signal output path of the output relay. When the local soft pressure plate prohibits tripping control or the local hard pressure plate physically blocks the tripping drive signal output path, a control result of no tripping is formed. When the local soft pressure plate allows tripping control and the local hard pressure plate allows the tripping drive signal output path, the output relay outputs a tripping drive signal to make the target circuit breaker perform a tripping action. After execution, the opening and closing status of the target circuit breaker is monitored and fed back to the master station. The master station judges whether the remote control operation was successfully executed based on the operation type and the opening and closing status monitoring results. This method can balance power supply control and result confirmation, improving the controllability of the load control process and the accuracy of the execution result judgment. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a flowchart of the circuit breaker selection and back-calibration collaborative control method in a load control scenario according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the application process of the return-to-school collaborative control in an embodiment of the present invention; Figure 3 This is a schematic diagram of the circuit breaker selection and feedback collaborative control system under a load control scenario according to an embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the connection relationship between the field smart energy unit, circuit breaker, and measurement unit in an embodiment of the present invention. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0022] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0023] Example 1 This embodiment applies to a remote load control scenario between a master station and a field smart energy unit. It employs a circuit breaker selection and calibration collaborative control system for load control scenarios. The system includes a master station and a field smart energy unit. The field smart energy unit includes a soft-switch function, a hard-switch hardware, and an output relay. The master station, as the remote control terminal, initiates control processes, issues control commands, and receives feedback results from the terminal.

[0024] The on-site smart energy unit, acting as an execution terminal, is installed at the site of the power distribution circuit of the dedicated transformer user. It is used to receive control commands issued by the master station, parse and verify the status of the commands, and execute corresponding control based on the status of the local soft pressure plate, hard pressure plate, and output relay.

[0025] The soft switch function is used to implement software-based power-saving control locally at the terminal, determining whether tripping control is permitted. The hard switch hardware is a physical switch independent of the software system, used to physically block or allow the trip drive signal output path of the output relay when tripping control is permitted. The output relay outputs a trip drive signal when the local soft switch permits tripping control and the local hard switch allows the trip drive signal output path, causing the target circuit breaker to perform a tripping action. For closing operations, the field smart energy unit controls the target circuit breaker to perform a closing action according to the corresponding control command. Both the soft and hard switches are located on the field smart energy unit side. The master station does not directly control the output relay, but achieves remote collaborative control through command and result interaction with the field smart energy unit.

[0026] The present invention provides a method for coordinated control of circuit breaker selection and back-calibration in load control scenarios, such as... Figure 1 and Figure 2 As shown, it includes steps S1 to S6.

[0027] Step S1: The master station sends a remote control selection command containing the target circuit breaker and operation type to the field smart energy unit. In this embodiment, before the master station sends the remote control selection command containing the target circuit breaker and operation type to the field smart energy unit, the master station and the field smart energy unit perform a session negotiation status verification. After the session negotiation status verification is successful, the field smart energy unit monitors the control loop access status and receives the remote control selection command after the control loop access status is normal.

[0028] Specifically, the master station first sends a session establishment request to the field smart energy unit as input for establishing this round of control flow. Upon receiving the session establishment request, the field smart energy unit responds to the communication request from the master station and returns the current communication status to the master station, serving as the output for the master station to determine whether the communication link between the two parties is functioning correctly. After receiving the communication status, the master station confirms the link availability and uses the confirmation result as the trigger condition for whether to continue this round of control flow.

[0029] Once the master station confirms that the communication link is normal, the on-site smart energy unit further detects the control loop access status locally and feeds back the control loop access detection results to the master station as input information for the master station to confirm whether the current on-site control loop has the conditions to continue executing subsequent control processes.

[0030] Session negotiation status verification can be achieved using a handshake mechanism, a link heartbeat mechanism, or a request-response confirmation mechanism; control loop access status monitoring can be achieved using auxiliary contact detection, power access detection, input / output loop continuity detection, or loop self-testing. If the master station does not receive a normal response from the field smart energy unit, the master station will re-initiate the session establishment request; if the field smart energy unit detects an abnormality in the control loop access, it will return the abnormality information to the master station, which will then terminate the current round of control.

[0031] In step S2, after receiving the remote control selection command, the field smart energy unit determines whether the current opening / closing state of the target circuit breaker meets the operation type and feeds back the selection result to the master station. Further, the operation type includes opening and closing. The steps for the field smart energy unit to determine whether the current opening / closing state of the target circuit breaker meets the operation type after receiving the remote control selection command include: when the operation type is opening, if the target circuit breaker is in the closing state, then the current opening / closing state of the target circuit breaker meets the operation type; when the operation type is closing, if the target circuit breaker is in the opening state, then the current opening / closing state of the target circuit breaker meets the operation type.

[0032] Specifically, the master station generates a remote selection command, which includes at least the target circuit breaker number and the target operation type. After receiving the remote selection command, the field smart energy unit parses the command parameters locally and first determines the current open / closed state of the target circuit breaker based on the operation type. When the operation type is open, it needs to confirm that the target circuit breaker is currently closed; when the operation type is closed, it needs to confirm that the target circuit breaker is currently open. The current open / closed state of the target circuit breaker can be obtained via remote signaling. If the current open / closed state of the target circuit breaker meets the operation type requirements, the field smart energy unit establishes a prerequisite for successful selection; if the current open / closed state of the target circuit breaker does not meet the operation type requirements, the field smart energy unit establishes a prerequisite for selection failure and returns the corresponding selection result to the master station.

[0033] In step S2, after receiving the remote control selection command, the field smart energy unit also verifies whether the target circuit breaker has been correctly connected to the control range of the current field smart energy unit, whether the control circuit corresponding to the target circuit breaker is in the connected state, and whether the current working state of the field smart energy unit is normal. When the verification is successful, the unit will send a successful selection result to the master station. If any verification fails, the unit will send a failed selection result and the corresponding error reason to the master station.

[0034] Specifically, after step S2 completes the judgment on whether the current opening and closing status of the target circuit breaker meets the operation type, the field smart energy unit continues to perform supplementary verification in the selection phase based on the locally stored equipment access information, control circuit access information, and terminal operation information. Specifically, whether the target circuit breaker has been correctly connected to the control range of the current field smart energy unit is used to confirm whether the currently remotely controlled object belongs to the controllable object of the field smart energy unit; whether the control circuit corresponding to the target circuit breaker is in the connected state is used to confirm that the execution link has the basis for subsequent execution at the hardware wiring level; and whether the current working status of the field smart energy unit is normal is used to confirm that the terminal currently has the ability to continue to enter the execution phase. After the field smart energy unit completes the above verifications, if all verifications pass, it sends a successful selection result to the master station; if any verification fails, it sends a selection failure result and the corresponding error reason to the master station. Upon receiving the selection failure result, the master station terminates the current round of control process.

[0035] Step S3: After receiving the successful selection result, the master station sends a remote control execution command for the target circuit breaker and operation type to the on-site smart energy unit.

[0036] Step S4: After receiving the remote control execution command, the on-site smart energy unit performs a back-calibration confirmation based on the consistency verification result between the remote control execution command and the remote control selection command, and feeds back the back-calibration confirmation result to the main station.

[0037] Step S5: After receiving the return-to-school confirmation result, the master station sends an execution confirmation command to the on-site smart energy unit.

[0038] Specifically, after the master station receives the successful selection result from the field smart energy unit, it sends a remote execution command to the field smart energy unit targeting the circuit breaker and the operation type. Upon receiving the remote execution command, the field smart energy unit does not immediately activate the output relay. Instead, it first verifies the consistency between the remote execution command and the remote selection command to confirm that the execution intent sent by the master station during the execution phase is consistent with the operation object and operation type during the selection phase.

[0039] The consistency verification includes at least the consistency verification of the target circuit breaker serial number and the consistency verification of the operation type. When the consistency verification passes, the field smart energy unit generates a return confirmation result and feeds it back to the master station. When the consistency verification fails, the field smart energy unit sends an error message to the master station and terminates the remote control operation. After receiving the return confirmation result, the master station sends an execution confirmation command to the field smart energy unit, thus entering the final execution judgment stage.

[0040] Step S6: After receiving the execution confirmation instruction, the on-site smart energy unit executes the remote control command. When the operation type is tripping, it determines whether tripping control is allowed based on the status of the local soft pressure plate. If tripping control is allowed, the local hard pressure plate physically blocks or allows the tripping drive signal output path of the output relay. When the local soft pressure plate allows tripping control and the local hard pressure plate allows the tripping drive signal output path, the output relay outputs a tripping drive signal to make the target circuit breaker perform a tripping action. When the local soft pressure plate prohibits tripping control or the local hard pressure plate physically blocks the tripping drive signal output path, a control result of no tripping is formed. When the operation type is closing, the target circuit breaker is controlled to perform a closing action.

[0041] Specifically, when the on-site smart energy unit receives the execution confirmation command, it does not execute it unconditionally based on the master station command. Instead, it differentiates the operation type based on the remote execution command and performs subsequent control accordingly. When the operation type is tripping, the on-site smart energy unit first determines whether tripping control is allowed based on the status of the local soft pressure plate. If the local soft pressure plate is in the power-on state, tripping control is prohibited, and the on-site smart energy unit generates a control result indicating that tripping was not performed locally. If the local soft pressure plate is in the de-power-on state, tripping control is allowed. If tripping control is allowed, the on-site smart energy unit further determines whether to physically block or physically allow the tripping drive signal output path of the output relay based on the status of the local hard pressure plate. If the local hard pressure plate is in the engaged state, it physically blocks the tripping drive signal output path, and the on-site smart energy unit generates a control result indicating that tripping was not performed. If the local hard pressure plate is in the disengaged state, it allows the tripping drive signal output path and allows the output relay to output a tripping drive signal, so that the target circuit breaker performs the tripping action. When the operation type is closing, the on-site smart energy unit executes the control corresponding to the closing operation according to the remote execution command, so that the target circuit breaker performs the closing action.

[0042] After receiving the execution confirmation command, the on-site smart energy unit monitors the opening and closing status of the target circuit breaker and feeds back the monitoring results to the master station, so that the master station can determine whether the remote control operation was successfully executed based on the operation type and the monitoring results.

[0043] Specifically, after completing local execution control, the on-site smart energy unit continues to monitor the opening and closing status of the target circuit breaker to confirm whether the target circuit breaker has completed the action corresponding to the operation type, thus forming a result confirmation closed loop. The opening and closing status of the target circuit breaker can be obtained through remote signaling. The on-site smart energy unit feeds back the opening and closing status monitoring results of the target circuit breaker to the master station. Based on the opening and closing status monitoring results returned by the on-site smart energy unit and in conjunction with the operation type corresponding to this remote control operation, the master station determines whether the remote control operation was successfully executed and completes the log recording, result archiving, and subsequent processing of this round of control flow.

[0044] In one embodiment of a low-voltage branch load control scenario, a chemical enterprise, acting as a dedicated transformer user, has its low-voltage power distribution circuit in its production workshop connected to a field smart energy unit for controlling the power supply circuit breaker of the production equipment. Because the enterprise's production process has high requirements for power supply continuity, any unexpected tripping could lead to raw material waste, equipment damage, or production interruption. Therefore, the main station and the field smart energy unit coordinate the control of the low-voltage power distribution circuit according to steps S1 to S6 described above.

[0045] During normal production, the hard switchboard within the on-site smart energy unit remains in the active state to ensure that even if the master station mistakenly initiates a tripping process, the field side will not directly output a tripping drive signal. Specifically, the master station first initiates a session establishment request to the on-site smart energy unit, which responds and returns a normal communication status message. Subsequently, the on-site smart energy unit further checks the control loop access status and returns a normal control loop access message to the master station. After receiving both the normal communication status and control loop access messages, the master station confirms that the on-site terminal has the conditions to enter the subsequent control process. Afterward, the master station issues a power supply release command to the on-site smart energy unit, causing the soft switchboard within the on-site smart energy unit to switch from the power supply protection state to the power supply release state.

[0046] Then, the master station sends a remote selection command containing the target circuit breaker number and the type of tripping operation to the field smart energy unit. Upon receiving the command, the field smart energy unit first determines whether the current tripping / closing status of the target circuit breaker meets the operation type. Since the current operation type is tripping, the field smart energy unit determines that the target circuit breaker is in the closed state, thus confirming that the current tripping / closing status of the target circuit breaker meets the operation type. Subsequently, the field smart energy unit also verifies whether the target circuit breaker has been correctly connected to its control range, whether the corresponding control circuit of the target circuit breaker is connected, and whether the current operating status of the field smart energy unit is normal. After all verifications pass, the field smart energy unit sends a successful selection result back to the master station.

[0047] After receiving the successful selection result, the master station sends a remote execution command for the target circuit breaker and operation type to the field smart energy unit. Upon receiving the remote execution command, the field smart energy unit performs a local verification of the consistency between the remote execution command and the remote selection command. If the consistency verification passes, it generates a feedback confirmation result and sends it back to the master station. Upon receiving the feedback confirmation result, the master station issues an execution confirmation command to the field smart energy unit. Upon receiving the execution confirmation command, the field smart energy unit first determines whether tripping control is allowed based on the local soft pressure plate status. Since the field smart energy unit detects that the soft pressure plate has been deactivated, tripping control is allowed. If tripping control is allowed, the field smart energy unit further determines the processing method for the trip drive signal output path based on the local hard pressure plate status. Since the local hard pressure plate is still in the active state, it physically blocks the trip drive signal output path, and the field smart energy unit generates a control result indicating that tripping was not performed locally.

[0048] Subsequently, the on-site smart energy unit continues to monitor the opening and closing status of the target circuit breaker and feeds back the monitoring results to the main station. Based on the returned monitoring results and the opening / closing operation type corresponding to this remote control operation, the main station determines that the remote control operation failed and logs the control process for this round. As can be seen from the above process, in low-voltage dedicated transformer user scenarios, this embodiment can prevent unexpected opening during production operation and ensure the integrity of remote operation logic through selection of recalibration and coordinated control of soft and hard pressure plates.

[0049] In another embodiment of a low-voltage branch load shedding scenario, when the chemical plant plans to shut down for maintenance and needs to disconnect the corresponding low-voltage branch load, the on-site operator first switches the hard switchboard in the smart energy unit from the engaged state to the disengaged state. Subsequently, the master station re-initiates a control preparation interaction with the on-site smart energy unit. After the on-site smart energy unit returns normal communication status and normal control loop access information to the master station, the master station issues a power supply release command to the on-site smart energy unit, causing the soft switchboard to be in the disengaged power supply state. Subsequently, the master station sends a remote control selection command containing the target circuit breaker and the tripping operation type to the field smart energy unit again. The field smart energy unit first determines whether the current tripping or closing status of the target circuit breaker meets the operation type. Since the current operation type is tripping and the target circuit breaker is in the closing state, it is determined that the current tripping or closing status of the target circuit breaker meets the operation type. It then further verifies whether the target circuit breaker has been correctly connected to the control range of the current field smart energy unit, whether the control circuit corresponding to the target circuit breaker is in the connected state, and whether the current working state of the field smart energy unit is normal. After the verification is passed, it sends a successful selection result back to the master station.

[0050] After receiving the successful selection result, the master station sends a remote control execution command for the target circuit breaker and operation type to the field smart energy unit. After receiving the remote control execution command, the field smart energy unit generates a return confirmation result based on the consistency verification result between the remote control execution command and the remote control selection command and sends it back to the master station. After receiving the return confirmation result, the master station sends an execution confirmation instruction to the field smart energy unit.

[0051] When the current operation type is tripping, after receiving the execution confirmation command, the field smart energy unit first determines whether tripping control is allowed based on the status of the local soft pressure plate. Since the local soft pressure plate is in the de-energized state at this time, tripping control is allowed. If tripping control is allowed, the field smart energy unit further determines the processing method for the trip drive signal output path based on the status of the local hard pressure plate. Since the local hard pressure plate is in the de-energized state at this time, the local hard pressure plate allows the trip drive signal output path to be opened, and allows the output relay to output a trip drive signal so that the target circuit breaker performs the tripping action.

[0052] Subsequently, the on-site smart energy unit monitors the opening and closing status of the target circuit breaker and feeds back the monitoring results to the main station. Based on the returned opening and closing status monitoring results and the opening operation type corresponding to this remote control operation, the main station determines that the remote control operation was successfully executed and records the operation results.

[0053] In one embodiment of a high-voltage branch load control scenario, a 10 kV high-voltage distribution circuit of a steel plant is connected to a field smart energy unit to control the power supply circuit breaker of the blast furnace cooling system. Since the blast furnace cooling system is a core production load, its power supply continuity is directly related to the safe operation of the blast furnace. Therefore, the main station and the field smart energy unit also coordinate the control of the high-voltage distribution circuit according to steps S1 to S6.

[0054] During normal operation of the blast furnace, the hard pressure plate in the on-site smart energy unit remains in the activated state. When the master station initiates a round of remote control tripping process due to communication interference, false triggering, or abnormal messages, the master station first initiates a session establishment and status confirmation with the on-site smart energy unit. The on-site smart energy unit feeds back information such as normal communication status and normal control loop access to the master station. After confirming that the execution basis is available on the field side, the master station issues a power protection release command to the on-site smart energy unit, causing the soft pressure plate to be in the deactivated power protection state.

[0055] Subsequently, the master station sends a remote control selection command to the field smart energy unit. The field smart energy unit first determines whether the current opening / closing status of the target circuit breaker meets the operation type. Since the current operation type is opening and the target circuit breaker is in the closed state, it is determined that the current opening / closing status of the target circuit breaker meets the operation type. It then further verifies whether the access range, control circuit access status, and the current working status of the field smart energy unit are normal. After successful verification, it returns the successful remote control selection result to the master station. The master station continues to send a remote control execution command to the field smart energy unit for the target circuit breaker and the operation type. The field smart energy unit verifies the consistency of the two commands and returns a confirmation result to the master station. The master station then sends an execution confirmation command to the field smart energy unit. Since the field smart energy unit detects that the soft pressure plate is in the de-energized state, it allows opening control. While opening control is allowed, since the local hard pressure plate is still in the engaged state, the local hard pressure plate physically blocks the trip drive signal output path. The field smart energy unit generates a control result indicating that opening was not executed, and the high-voltage circuit breaker remains in the closed state.

[0056] Subsequently, the on-site smart energy unit monitors the opening and closing status of the target circuit breaker and feeds back the monitoring results to the main station. Based on the returned opening and closing status monitoring results and the opening operation type corresponding to this remote control operation, the main station determines that the remote control operation has failed and completes the log recording of this round of abnormal control process.

[0057] In a high-voltage branch load shedding scenario, when a steel plant needs to perform planned shutdown maintenance on its blast furnace system, the on-site operator first switches the hard pressure plate in the smart energy unit from the engaged state to the disengaged state. Then, the master station re-initiates the control interaction process with the on-site smart energy unit. The on-site smart energy unit returns the communication status and control loop status to the master station. After confirming that the on-site status is normal, the master station issues a power supply release command to the on-site smart energy unit, causing the soft pressure plate to be in the disengaged power supply state. Next, the master station issues a remote control selection command containing the target circuit breaker and the opening operation type. The on-site smart energy unit determines whether the current opening / closing state of the target circuit breaker meets the operation type. If the current operation type is opening and the target circuit breaker is in the closing state, it determines that the operation type is met, and simultaneously completes other selection stage verifications and returns the successful selection result to the master station. The master station continues to issue remote control execution commands for the target circuit breaker and the operation type. The on-site smart energy unit completes consistency verification and generates a return confirmation result, which is then returned to the master station. The master station subsequently issues an execution confirmation instruction.

[0058] Since the local smart energy unit detects that the soft pressure plate is in the released power protection state, the trip control is allowed. When the trip control is allowed, since the local hard pressure plate is in the released state, the local hard pressure plate releases the trip drive signal output path and allows the output relay to output the trip drive signal so that the high-voltage circuit breaker can perform the trip action, thereby cutting off the load of the high-voltage power distribution circuit corresponding to the blast furnace cooling system.

[0059] Subsequently, the on-site smart energy unit continues to monitor the circuit breaker's opening and closing status and feeds back the monitoring results to the master station. Based on the returned monitoring results and the type of opening operation corresponding to this remote control operation, the master station determines that the remote control operation was successfully executed and completes the shutdown maintenance operation log recording. Therefore, this embodiment, in both low-voltage and high-voltage branch load control scenarios, can avoid unintended opening and accurately complete load shedding when permissible through multi-round interactions between the master station and the on-site smart energy unit, as well as the coordinated control between the soft and hard pressure plates and the output relays within the on-site terminal.

[0060] The method in this embodiment establishes a complete selection and return-to-home collaborative control process between the master station and the field smart energy unit by sequentially connecting the session negotiation status verification, control loop access status monitoring, remote control selection, status matching judgment, return-to-home confirmation, execution confirmation, and post-execution monitoring. The on-site smart energy unit first determines whether the current opening and closing status of the target circuit breaker meets the operation type. Then, it performs supplementary verification based on the access range, control circuit access status, and terminal working status. Upon receiving the execution confirmation instruction, it executes the remote control command. When the operation type is opening, it determines whether opening control is allowed based on the status of the local soft pressure plate. When opening control is allowed, the local hard pressure plate physically blocks or allows the trip drive signal output path of the output relay. When the local soft pressure plate allows opening control and the local hard pressure plate allows the trip drive signal output path, the output relay outputs a trip drive signal to make the target circuit breaker perform the opening action. When the local soft pressure plate prohibits opening control or the local hard pressure plate physically blocks the trip drive signal output path, a control result of not performing opening is formed. When the operation type is closing, it controls the target circuit breaker to perform the closing action. Subsequently, it monitors the opening and closing status of the target circuit breaker and feeds back the opening and closing status monitoring results to the master station. The master station determines whether the remote control operation was successfully executed based on the operation type and the opening and closing status monitoring results. Therefore, the method of this embodiment can achieve accurate remote control of the circuit breaker when communication is normal, control circuit access is normal and selection phase verification is passed, and can also block unexpected tripping when the soft pressure plate is in power supply or the hard pressure plate is in operation. The result feedback ensures the verifiability and safety of the entire remote control process.

[0061] Example 2 like Figure 3 As shown, based on the same inventive concept as the above embodiments, the present invention also provides a circuit breaker selection and back-calibration collaborative control system for load control scenarios, including: a master station and a field smart energy unit, wherein the field smart energy unit includes a soft pressure plate function, a hard pressure plate hardware and an output relay; The master station is used to send remote control selection commands containing the target circuit breaker and operation type to the field smart energy units; The on-site smart energy unit receives the remote selection command, determines whether the current opening and closing status of the target circuit breaker meets the operation type, and feeds back the selection result to the main station. The main station is also used to send remote control execution commands to the on-site smart energy units after receiving a successful selection result, targeting the circuit breaker and operation type. The on-site smart energy unit is also used to receive remote execution commands, perform back-calibration confirmation based on the consistency verification results between the remote execution commands and the remote selection commands, and feed back the back-calibration confirmation results to the main station; The main station is also used to send an execution confirmation command to the on-site smart energy unit after receiving the return-to-school confirmation result; The on-site smart energy unit is also used to, upon receiving an execution confirmation instruction, to determine whether tripping control is permitted based on the status of the local soft pressure plate when the operation type is tripping. If tripping control is permitted, the local hard pressure plate physically blocks or allows the tripping drive signal output path of the output relay. When the local soft pressure plate allows tripping control and the local hard pressure plate allows the tripping drive signal output path, the output relay outputs a tripping drive signal to cause the target circuit breaker to perform a tripping action. When the local soft pressure plate prohibits tripping control or the local hard pressure plate physically blocks the tripping drive signal output path, a control result of no tripping is generated. When the operation type is closing, the target circuit breaker is controlled to perform a closing action.

[0062] In this invention, the master station is also used to perform session negotiation status verification with the field smart energy unit before sending a remote control selection command containing the target circuit breaker and operation type to the field smart energy unit. The on-site smart energy unit is also used to monitor the control loop access status after the session negotiation status is verified, and to receive remote control selection commands after the control loop access status is normal. The on-site smart energy unit is also used to monitor the opening and closing status of the target circuit breaker after receiving the execution confirmation command; The monitoring results of the target circuit breaker's opening and closing status are fed back to the main station; The master station is also used to determine whether the remote control operation was successfully executed based on the operation type and the opening / closing status monitoring results.

[0063] In this invention, the operation types include opening and closing, and the on-site smart energy unit is also used for: When the operation type is tripping, if the target circuit breaker is in the closed state, it is determined that the current tripping or closing state of the target circuit breaker satisfies the operation type. When the operation type is closing, if the target circuit breaker is in the opening state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type.

[0064] In this invention, the field smart energy unit is also used to verify, after receiving the remote selection command, whether the target circuit breaker has been correctly connected to the control range of the current field smart energy unit, whether the control circuit corresponding to the target circuit breaker is in the connected state, and whether the current working state of the field smart energy unit is normal. When the verification passes, a successful selection result is sent to the main station; If any validation fails, the system will report the selection failure result and the corresponding error reason to the main site.

[0065] In this invention, the on-site intelligent energy unit is specifically used to prohibit tripping control when the local soft pressure plate is in the power-protection state; to allow tripping control when the local soft pressure plate is in the power-protection deprotection state; to physically block the tripping drive signal output path when tripping control is allowed and the local hard pressure plate is in the engaged state; and to allow the tripping drive signal output path when tripping control is allowed and the local hard pressure plate is in the deactivated state, and to allow the output relay to output the tripping drive signal.

[0066] like Figure 4 As shown, in a specific application scenario, the field smart energy unit can be connected to the power distribution circuit and linked to multiple circuit breakers and corresponding measurement units. The field smart energy unit receives remote selection commands, remote execution commands, and execution confirmation instructions from the master station, and communicates with each measurement unit to obtain the opening and closing status of the corresponding circuit breaker and related measurement information. Each measurement unit can be set up in a different load branch to collect the switch status information of the corresponding branch and feed it back to the field smart energy unit. This allows the field smart energy unit to determine whether the current opening and closing status of the target circuit breaker meets the operation type, and to monitor and confirm the actual opening and closing status of the target circuit breaker after the execution confirmation instruction is issued. Therefore, the field smart energy unit can not only achieve selection and calibration interaction with the master station, but also complete the opening and closing control and status feedback of the target load branch based on the connection relationship between the field circuit breakers and measurement units.

[0067] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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 the invention. In this specification, 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.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for coordinated control of circuit breaker selection and feedback in a load control scenario, characterized in that, The method includes: The master station sends a remote control selection command containing the target circuit breaker and operation type to the on-site smart energy unit; After receiving the remote control selection command, the on-site smart energy unit determines whether the current opening and closing status of the target circuit breaker meets the operation type, and feeds back the selection result to the master station. After receiving the successful selection result, the master station sends a remote control execution command for the target circuit breaker and the operation type to the field smart energy unit; After receiving the remote control execution command, the on-site smart energy unit performs a back-calibration confirmation based on the consistency verification result between the remote control execution command and the remote control selection command, and feeds back the back-calibration confirmation result to the main station; After receiving the return-to-school confirmation result, the main station sends an execution confirmation command to the on-site smart energy unit; After receiving the execution confirmation command, the on-site smart energy unit, in response to the remote execution command, determines whether tripping control is allowed based on the status of the local soft pressure plate when the operation type is tripping. If tripping control is allowed, the local hard pressure plate physically blocks or allows the tripping drive signal output path of the output relay. When the local soft pressure plate allows tripping control and the local hard pressure plate allows the tripping drive signal output path, the output relay outputs a tripping drive signal to cause the target circuit breaker to perform a tripping action. When the local soft pressure plate prohibits tripping control or the local hard pressure plate physically blocks the tripping drive signal output path, a control result of no tripping is formed. When the operation type is closing, the target circuit breaker is controlled to perform a closing action.

2. The selective return-to-school collaborative control method according to claim 1, characterized in that, Before the master station sends a remote control selection command containing the target circuit breaker and operation type to the field smart energy unit, the method further includes: The main station conducts a session negotiation and status verification with the on-site smart energy unit; After the session negotiation status verification is passed, the on-site smart energy unit monitors the control loop access status and receives the remote control selection command after the control loop access status is normal. After the on-site smart energy unit receives the execution confirmation command, it also includes: The on-site smart energy unit monitors the opening and closing status of the target circuit breaker; The monitoring results of the opening and closing status of the target circuit breaker are fed back to the main station; The master station determines whether the remote control operation was successfully executed based on the operation type and the opening / closing status monitoring results.

3. The selective return-to-school collaborative control method according to claim 1, characterized in that, The operation types include opening and closing. After receiving the remote control selection command, the on-site smart energy unit determines whether the current opening / closing status of the target circuit breaker meets the operation type requirements. The steps include: When the operation type is opening, if the target circuit breaker is in the closed state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type. When the operation type is closing, if the target circuit breaker is in the opening state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type.

4. The selective return-to-school collaborative control method according to claim 1, characterized in that, Also includes: After receiving the remote selection command, the on-site smart energy unit also verifies whether the target circuit breaker has been correctly connected to the control range of the current on-site smart energy unit, whether the control circuit corresponding to the target circuit breaker is in the connected state, and whether the current working state of the on-site smart energy unit is normal. When the verification passes, a successful selection result is sent back to the main station; If any verification fails, the system will send a message to the main station indicating the selection failure and the corresponding error reason.

5. The selective return-to-school collaborative control method according to claim 1, characterized in that, When the operation type is circuit breaker tripping, the steps of determining whether circuit breaker tripping control is allowed based on the status of the local soft circuit breaker, and when circuit breaker tripping control is allowed, physically blocking or allowing the tripping drive signal output path of the output relay by the local hard circuit breaker include: When the local soft circuit breaker is in power-protection mode, tripping control is prohibited; When the local soft pressure plate is in the de-energized state, tripping control is allowed; When tripping control is enabled and the local hard switch is in the activated state, the local hard switch physically blocks the tripping drive signal output path. When tripping control is enabled and the local hard switch is in the deactivated state, the local hard switch releases the trip drive signal output path and allows the output relay to output the trip drive signal.

6. A circuit breaker selection and feedback collaborative control system for load control scenarios, characterized in that, include: The main station and field smart energy units, the field smart energy units include soft pressure plate functions, hard pressure plate hardware and output relays; The master station is used to send remote control selection commands containing the target circuit breaker and operation type to the field smart energy units; After receiving the remote control selection command, the on-site smart energy unit determines whether the current opening and closing status of the target circuit breaker meets the operation type and feeds back the selection result to the master station. The main station is also used to send remote control execution commands for the target circuit breaker and the operation type to the field smart energy unit after receiving the successful selection result; The on-site smart energy unit is also used to receive the remote execution command, perform back-calibration confirmation based on the consistency verification result between the remote execution command and the remote selection command, and feed back the back-calibration confirmation result to the main station; The main station is also used to send an execution confirmation command to the on-site smart energy unit after receiving the return-to-school confirmation result; The on-site smart energy unit is also used to, upon receiving the execution confirmation instruction, to execute the remote control command. When the operation type is tripping, it determines whether tripping control is allowed based on the status of the local soft pressure plate. If tripping control is allowed, the local hard pressure plate physically blocks or allows the tripping drive signal output path of the output relay. When the local soft pressure plate allows tripping control and the local hard pressure plate allows the tripping drive signal output path, the output relay outputs a tripping drive signal to cause the target circuit breaker to perform a tripping action. When the local soft pressure plate prohibits tripping control or the local hard pressure plate physically blocks the tripping drive signal output path, a control result of no tripping is formed. When the operation type is closing, it controls the target circuit breaker to perform a closing action.

7. The collaborative control system for selecting students to return to school according to claim 6, characterized in that, The master station is also used to perform session negotiation status verification with the field smart energy unit before sending a remote control selection command containing the target circuit breaker and operation type to the field smart energy unit. The on-site smart energy unit is also used to monitor the control loop access status after the session negotiation status is verified, and to receive the remote control selection command after the control loop access status is normal. The on-site smart energy unit is also used to monitor the opening and closing status of the target circuit breaker after receiving the execution confirmation command; The monitoring results of the opening and closing status of the target circuit breaker are fed back to the main station; The master station is also used to determine whether the remote control operation was successfully executed based on the operation type and the opening / closing status monitoring results.

8. The collaborative control system for selecting students to return to school according to claim 6, characterized in that, The operation types include opening and closing the circuit breaker. The on-site smart energy unit is also used for: When the operation type is opening, if the target circuit breaker is in the closed state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type. When the operation type is closing, if the target circuit breaker is in the opening state, it is determined that the current opening / closing state of the target circuit breaker satisfies the operation type.

9. The collaborative control system for selecting students to return to school according to claim 6, characterized in that, The on-site smart energy unit is also used to verify, after receiving the remote selection command, whether the target circuit breaker has been correctly connected to the control range of the current on-site smart energy unit, whether the control circuit corresponding to the target circuit breaker is in the connected state, and whether the current working state of the on-site smart energy unit is normal. When the verification passes, a successful selection result is sent back to the main station; If any verification fails, the system will send a message to the main station indicating the selection failure and the corresponding error reason.

10. The selective return-to-school collaborative control system according to claim 6, characterized in that, Specifically, the on-site intelligent energy unit is used to prohibit tripping control when the local soft pressure plate is in a power-protected state; to allow tripping control when the local soft pressure plate is in a de-powered state; to physically block the tripping drive signal output path when tripping control is allowed and the local hard pressure plate is in an engaged state; and to allow the tripping drive signal output path when tripping control is allowed and the local hard pressure plate is in a de-energized state, and to allow the output relay to output the tripping drive signal.

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