Hydraulic power plant primary equipment logic locking system and control method thereof

Abstract

The invention provides a hydraulic power plant primary equipment logic locking system, which comprises a system host, a monitoring module, a transmission module, an alarm module and a man-machine interaction module, and is characterized in that the system host is in control connection with primary equipment, is in communication connection with the monitoring module through the transmission module, and is electrically connected with the alarm module and the man-machine interaction module. The invention further provides a control method of the hydraulic power plant primary equipment logic locking system. According to the method, misoperation can be effectively prevented, the safety coefficient is improved, related workers can clearly know the installation and connection mode of primary equipment locking, related operation can be carried out according to the logic locking relation in the overhaul and debugging period, and meanwhile safe operation or overhaul of equipment is effectively protected.

Description

Technical Field

[0001] The present invention relates to the technical field of primary equipment control in power systems, and particularly to a primary equipment logic interlocking system for a hydropower plant and its control method. Background Art

[0002] The primary equipment in a power system mainly includes circuit breakers, disconnectors, earthing switches, etc.

[0003] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their application scope. The boundary between high and low voltages is relatively blurred. Generally, those above 3 kV are called high-voltage electrical appliances.

[0004] A disconnector is a switching device used for "isolating the power supply, switching operations, and connecting and disconnecting small-current circuits" without an arc-extinguishing function. When the disconnector is in the open position, there is an insulating distance that meets the specified requirements and an obvious disconnection mark between the contacts; when in the closed position, it is a switching device that can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuits) within a specified time. Generally, it is used as a high-voltage disconnector, that is, a disconnector with a rated voltage above 1 kV. Its working principle and structure are relatively simple, but due to the large usage amount and high requirements for working reliability, it has a great impact on the design, establishment, and safe operation of substations and power plants. The main feature of a disconnector is its lack of arc-extinguishing ability and can only disconnect and connect the circuit without load current.

[0005] The main function of the earthing switch in a hydropower plant is to serve as a safety measure during maintenance to prevent the danger caused by sudden power-on. There are disconnector devices on both sides of the circuit breaker, and there are earthing switch devices outside the disconnectors. When the circuit breaker is under maintenance, it is necessary to disconnect the circuit breakers on both sides and close the earthing switches on both sides.

[0006] There are two operation modes for primary equipment. One is remote operation, that is, operating within the hydropower plant monitoring system, and the other is on-site operation. There is a control cabinet at the site of each primary equipment, and the primary equipment is operated through the control cabinet. However, whether it is remote operation or on-site operation, certain interlocking relationships need to be followed to prevent misoperation. Misoperation of primary equipment will have serious consequences, not only affecting the safe operation of the equipment but also leading to personal injury accidents. However, when controlled or operated manually, errors are inevitable, which may trigger safety accidents. Therefore, a logic interlocking system set according to the interlocking relationship is required to control and manage all primary equipment, thereby eradicating the possible errors in manual control or operation and better protecting the safe operation of the equipment. Summary of the Invention

[0007] In view of the deficiencies existing in the prior art, the present invention provides a primary equipment logic interlocking system for a hydropower plant and its control method, which solves the problem that safety accidents may be caused by mistakes when manually controlling or operating primary equipment in the prior art.

[0008] In a first aspect, the present invention proposes a primary equipment logic interlocking system for a hydropower plant. The logic interlocking system is set corresponding to the primary equipment of the hydropower plant and includes a system host, a monitoring module, a transmission module, an alarm module, and a human-machine interaction module. Among them, the system host is control-connected to the primary equipment, communicatively connected to the monitoring module through the transmission module, and electrically connected to the alarm module and the human-machine interaction module;

[0009] The monitoring module collects the operation data of the primary equipment and the generator set, and sends the data to the system host through the transmission module;

[0010] After receiving the data of the primary equipment and the generator set, the system host performs logic interlocking control on the primary equipment according to the logic interlocking relationship, and continuously monitors the operation states of the primary equipment and the generator set;

[0011] The alarm module alarms when the primary equipment fails to open according to the logic interlocking relationship, and when the primary equipment or the generator set has abnormal operation;

[0012] The human-machine interaction module is used to display the data received by the system host and the text information of the alarm, and at the same time allows the staff to complete the improvement of the logic locking relationship and parameter setting work.

[0013] Further, the monitoring module includes a primary equipment monitoring component and a generator set detection component. The primary equipment monitoring component monitors and collects the operation state of the primary equipment in real time, and the generator set detection component monitors and collects whether the generator set is in the grid-connected operation state and the maintenance state.

[0014] Further, the system host combines the received information with the logic interlocking relationship to perform logic interlocking control. When the staff operates the primary equipment, they need to strictly execute the logic interlocking relationship. If the logic interlocking relationship is not executed, the system will issue an alarm and lock the operation of the primary equipment.

[0015] Further, after the alarm module alarms, it requires the staff to confirm the operation error and perform a manual reset. Only after the reset can the operation of the primary equipment continue.

[0016] In a second aspect, the present invention also proposes a control method for a primary equipment logic interlocking system of a hydropower plant, including the following steps:

[0017] S1. Connect the primary equipment of the hydropower plant in sequence according to the logical interlock relationship. As long as there is an interlocked logical relationship, the primary equipment cannot be operated; the unlocking relationship is the reverse of the interlock relationship. When the unlocking logical relationship is satisfied, the relevant primary equipment can be operated.

[0018] S2. The logical interlock system of the primary equipment is controlled by the software in the corresponding system host. When operating in the primary equipment control cabinet, if the logical interlock relationship is not satisfied, that is, through the software program, control the operation buttons and operation contacts of the primary equipment to lock the operations that do not satisfy the logical interlock relationship to ensure safety.

[0019] S3. After the logical interlock system of the primary equipment runs, immediately collect the operating status of the generator set and at the same time collect the status of all primary equipment, and transmit the collected information to the staff.

[0020] S4. When the relevant equipment operates abnormally, an alarm is issued to prompt the staff to check the system equipment in time to ensure that the logical interlock system of the primary equipment can operate normally; when the operator does not operate according to the logical relationship of the primary equipment, the system issues an alarm to prompt the staff that the operation is incorrect.

[0021] S5. After the operation of the primary equipment is completed, perform a one-key reset in the logical interlock control system. After the reset, set according to the normal operation of the primary equipment, and then clear the status of the primary equipment and re-obtain the equipment status to ensure that the equipment status used for the logical interlock relationship is accurate.

[0022] Further, the logical interlock relationship is specifically as follows:

[0023] If the circuit breaker is not opened, the disconnectors on both sides cannot be operated, and the earthing switch is locked at the same time.

[0024] If the disconnectors on both sides are not closed, the closing operation of the circuit breaker is locked.

[0025] If the disconnector is not opened, the earthing switch cannot be closed, and the circuit breaker is locked at the same time.

[0026] If the earthing switch is closed, the circuit breaker cannot be operated, and the disconnectors on both sides are locked at the same time.

[0027] As long as the status of one of the associated circuit breaker, disconnector, and earthing switch is uncertain, the other associated equipment is locked.

[0028] Further, in step S2, after completing the control setting of the primary equipment and the system host, a system internal verification is required. By changing the status of the primary equipment and setting the status of the primary equipment inside the system, check whether the logical interlock works. All locks can normally lock the primary equipment inside the system, that is, the system is normal and can be put into operation.

[0029] Further, in step S3, all the collected primary equipment status data are backed up and stored in the system host, and all operations and changes are recorded.

[0030] Further, in step S4, after a misoperation alarm occurs, it can only be operated again after being confirmed and reset by the staff; after several operation errors, the system is locked and the staff cannot operate after confirmation. The staff needs to enter the system host to reset it before continuing the operation.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. After the primary equipment has logical interlocking, misoperations can be effectively prevented. The main misoperations of primary equipment include opening the circuit breaker when the switch is closed and closing the circuit breaker with the grounding switch. Misoperations of primary equipment will have serious impacts, not only affecting the safe operation of the equipment, but also leading to personal injury accidents. The logical interlocking function of primary equipment can lock the equipment when a wrong operation occurs, effectively preventing misoperations;

[0033] 2. There is a certain operating relationship or maintenance relationship between primary equipment. When operating or performing other work on a certain primary equipment under maintenance, it may affect the related primary equipment, thus causing harm to the operating equipment. The interlocking relationship of primary equipment can effectively prevent such operations or work from occurring. After the primary equipment is interlocked, when the equipment to be operated affects other equipment or is affected by other equipment, the interlocking relationship can effectively protect the safe operation or maintenance of the equipment;

[0034] 3. Through the logical interlocking relationship of primary equipment, relevant staff can clearly understand the installation and connection method of the primary equipment interlocking. During the maintenance and debugging period, relevant operations can be carried out according to the logical interlocking relationship, improving the efficiency and safety factor of the maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a module relationship diagram of the primary equipment logical interlocking system in the embodiment of the present invention.

[0036] Figure 2 It is a logical interlocking diagram of some primary equipment in this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0037] The technical solutions in the present invention will be further described below with reference to the drawings and embodiments.

[0038] As Figure 1As shown in the figure, an embodiment of the present invention provides a primary equipment logic locking system for a hydropower plant. The logic locking system is set corresponding to the primary equipment of the hydropower plant and includes a system host, a monitoring module, a transmission module, an alarm module, and a human-computer interaction module. Among them, the system host is connected to the primary equipment for control, communicates with the monitoring module through the transmission module, and is electrically connected to the alarm module and the human-computer interaction module; the monitoring module collects the operation data of the primary equipment and the generator set, and sends the data to the system host through the transmission module; after receiving the data of the primary equipment and the generator set, the system host performs logic locking control on the primary equipment according to the logic locking relationship, and continuously monitors the operation status of the primary equipment and the generator set; the alarm module alarms when the primary equipment fails to open according to the logic locking relationship, and when the primary equipment or the generator set has an abnormal operation; the human-computer interaction module is used to display the data received by the system host and the text information of the alarm, and at the same time allows the staff to complete the improvement of the logic locking relationship and the parameter setting work.

[0039] Further, the monitoring module includes a primary equipment monitoring component and a generator set detection component. The primary equipment monitoring component monitors and collects the operation status of the primary equipment in real time, and the generator set detection component monitors and collects whether the generator set is in the grid-connected operation state and the maintenance state.

[0040] The operation of the logic locking system requires timely and comprehensive control of the real-time status of the primary equipment. The primary equipment status monitoring device monitors and collects the operation status of the primary equipment in real time, and transmits the primary equipment status to the system host through the signal transmission device. After the system runs, it will monitor and collect the status of the generator set and transmit the generator set status to the system host. Whether the generator set is in the grid-connected operation state or the maintenance state has a great impact on the misoperation of the primary equipment or subsequent operations and experiments, and it is necessary to timely master the real-time status of the generator set.

[0041] Further, the system host combines the received information with the logic locking relationship to perform logic locking control. When the staff operates the primary equipment, they need to strictly execute the logic locking relationship. If the logic locking relationship is not executed, the system will issue an alarm, lock the operation of the primary equipment, prompt the staff to deal with it in time, and issue an alarm when the primary equipment does not operate according to the logic locking relationship, prompt the staff that the operation is incorrect, and correct it in time. Preferably, the system host is a dual host, with each other as a backup.

[0042] Furthermore, after the alarm module issues an alarm, it is necessary for the staff to confirm the operation error and perform a manual reset. Only after the reset can the equipment be operated again. The alarm function can be set with relevant parameters manually to make the alarm function more suitable for use. Specifically, when the related equipment of the primary equipment logic interlocking system runs abnormally, such as power failure of the equipment or inability to collect status information, an alarm is issued to prompt the staff to check the system equipment in time to ensure the normal operation of the primary equipment logic interlocking system. The alarm combines text alarm and buzzer alarm. After the staff hears the buzzer alarm, they can check the text alarm information in time and handle the alarm situation in time. When the operator does not operate according to the logic relationship of the primary equipment, the system issues an alarm to prompt the staff of the operation error and displays the logic relationship in the man-machine interaction. After the misoperation alarm occurs, only after the staff confirms and resets it in the man-machine interaction can the next operation be carried out. After the second operation error (the number of times can be set), the system is locked and the staff cannot operate after confirmation. It is necessary for the staff to enter the system for reset before they can continue to operate.

[0043] In addition, during actual use, there are special buttons for the input and output of the locking function of the entire system. After the system runs, click the input locking button, and the logic locking relationships of all primary equipment will take effect and start the locking protection. After clicking the output locking button, the logic locking relationships of all primary equipment will become invalid, and no reminder will be issued for incorrect operations.

[0044] Under normal operating conditions, it is not allowed to exit the locking function of the system. If it is really necessary to exit, it needs to be reviewed by relevant leaders. The exit of the system locking function requires double confirmation, that is, after clicking to exit the locking function, a dialog box will pop up asking whether to exit the locking function. After confirmation, the locking function exit will pop up again. After confirmation again, the system locking function will exit.

[0045] The present invention also proposes a control method for the primary equipment logic interlocking system of a hydropower plant, including the following steps:

[0046] S1. Connect the primary equipment of the hydropower plant in sequence according to the logic interlocking relationship. As long as there is a locking logic relationship, this primary equipment cannot be operated; the unlocking relationship is the reverse of the locking relationship. When the unlocking logic relationship is satisfied, the relevant primary equipment can be operated;

[0047] S2. The primary equipment logic interlocking system is controlled by software in the corresponding system host. When operating in the primary equipment control cabinet, if the logic interlocking relationship is not satisfied, that is, through the software program, control the operation buttons and operation contacts of the primary equipment to lock the operations that do not satisfy the logic interlocking relationship to ensure safety;

[0048] S3. After the primary equipment logic interlocking system runs, immediately collect the operating status of the generator set and the status of all primary equipment at the same time, and transmit the collected information to the staff;

[0049] S4. When the relevant equipment operates abnormally, an alarm is issued to prompt the staff to check the system equipment in time to ensure the normal operation of the primary equipment logic interlocking system; when the operator does not operate according to the logic relationship of the primary equipment, the system issues an alarm to prompt the staff that the operation is incorrect;

[0050] S5. After the operation of the primary equipment is completed, perform a one-key reset in the logic interlocking control system. After the reset, set according to the normal operation of the primary equipment, and then clear the status of the primary equipment, and re-obtain the equipment status to ensure that the equipment status used for the logic interlocking relationship is accurate.

[0051] Further, the logic interlocking relationship is specifically as follows:

[0052] If the circuit breaker is not opened, the disconnectors on both sides cannot be operated, and the earthing switch is locked at the same time;

[0053] If the disconnectors on both sides are not closed, the closing operation of the circuit breaker is locked;

[0054] If the disconnector is not opened, the earthing switch cannot be closed, and the circuit breaker is locked at the same time;

[0055] If the earthing switch is closed, the circuit breaker cannot be operated, and the disconnectors on both sides are locked at the same time;

[0056] As long as the status of one of the associated circuit breaker, disconnector, and earthing switch is uncertain, the other associated equipment is locked.

[0057] Further, in step S2, after the control settings of the primary equipment and the system host are completed, system internal verification is required. By changing the status of the primary equipment and setting the status of the primary equipment inside the system, check whether the logic interlocking takes effect. All interlocks can normally lock the primary equipment inside the system, that is, the system is normal and can be put into operation.

[0058] In addition, on-site actual operation verification can only be carried out under certain conditions. During maintenance or equipment debugging, on-site operation interlock verification can be carried out on the premise of ensuring safety. The on-site operation verification still depends on the interlocking relationship of the primary equipment. By opening and closing the primary equipment, check whether the interlocking conditions can reliably lock the relevant primary equipment.

[0059] Further, in step S3, all the collected primary equipment status data are backed up and stored in the system host. Any operation in the primary equipment logic locking software system requires logging in to the system. After logging in, all operations and changes will be recorded by the system for easy later reference. Different personnel have different permissions after logging in to the system and can perform different operations.

[0060] Further, in step S4, after a misoperation alarm occurs, the next operation can only be carried out after being confirmed and reset by the staff; after several operation errors, the system is locked and the staff cannot perform operations after confirmation. The staff needs to enter the system host to reset it before continuing the operation.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A logic interlocking system for primary equipment of a hydropower plant, wherein the logic interlocking system is set corresponding to the primary equipment of the hydropower plant, and is characterized by: It includes a system host, a monitoring module, a transmission module, an alarm module and a human-computer interaction module, wherein the system host is connected to the primary equipment control, is connected to the monitoring module through the transmission module, and is electrically connected to the alarm module and the human-computer interaction module; The monitoring module collects the operating data of the primary equipment and the generator set, and sends the data to the system host through the transmission module; After receiving the data of the primary equipment and the generator set, the system host performs logic interlock control on the primary equipment according to the logic interlock relationship, and continuously monitors the operating status of the primary equipment and the generator set; The alarm module will alarm when the primary equipment is not turned on according to the logical interlocking relationship, and when the primary equipment or the generator set has an abnormal operation; The human-computer interaction module is used to display the data received by the system host and the text information of the alarm, and at the same time allows the staff to improve the logical locking relationship and set parameters.

2. The logic interlocking system for primary equipment of a hydropower plant according to claim 1, characterized in that: The monitoring module includes a primary equipment monitoring component and a generator set detection component. The primary equipment monitoring component monitors and collects the operating status of the primary equipment in real time, and the generator set detection component monitors and collects whether the generator set is in a grid-connected operating state and a maintenance state.

3. The logic interlocking system for primary equipment of a hydropower plant according to claim 1, characterized in that: The system host combines the received information with the logical interlock relationship to perform logical interlock control. When the staff performs a device operation, they need to strictly follow the logical interlock relationship. If they fail to follow the logical interlock relationship, the system will issue an alarm and interlock the device operation.

4. The logic interlocking system for primary equipment of a hydropower plant according to claim 1, characterized in that: After the alarm module sounds an alarm, the staff needs to confirm the operation error and perform manual reset. Only after the reset can the equipment be operated again.

5. A control method for a logic interlocking system of a primary equipment in a hydropower plant as claimed in claim 1, characterized in that: The steps include: S1. Connect the primary equipment of the hydropower plant in sequence according to the logical blocking relationship. As long as the blocking logical relationship exists, the primary equipment cannot be operated; the unlocking relationship is the reverse of the blocking relationship. When the unlocking logical relationship is met, the relevant primary equipment can be operated; S2. The primary equipment logic interlocking system is controlled by the software in the corresponding system host. When operating in the primary equipment control cabinet, if the logic interlocking relationship is not satisfied, the operation buttons and operation contacts of the primary equipment are controlled through the software program to interlock the operation that does not satisfy the logic interlocking relationship to ensure safety; S3. After the primary equipment logic interlocking system is running, the operating status of the generator set is collected immediately, and the status of all primary equipment is collected at the same time, and the collected information is transmitted to the staff; S4. When the relevant equipment is operating abnormally, an alarm is issued to remind the staff to check the system equipment in time to ensure the normal operation of the primary equipment logic interlocking system; when the operator does not operate according to the logical relationship of the primary equipment, the system will issue an alarm to remind the staff of the operation error; S5. After the operation of a device is completed, perform a one-key reset in the logic interlock control system. After the reset, set it according to the normal operation of the device, then clear the device status and re-acquire the device status to ensure that the device status used in the logic interlock relationship is accurate.

6. The control method according to claim 5, characterized in that: The logical locking relationship is specifically: If the circuit breaker is not separated, the isolating switches on both sides cannot be operated, and the grounding switch is locked at the same time; The isolating switches on both sides are not closed, and the circuit breaker closing operation is blocked; If the isolating switch is not separated, the grounding switch cannot be closed and the circuit breaker is locked at the same time; The grounding switch is closed, the circuit breaker cannot be operated, and the isolating switches on both sides are locked; If any of the associated circuit breakers, disconnectors, and earthing switches is in an uncertain state, the other associated devices will be locked.

7. The control method according to claim 5, characterized in that: In step S2, after completing the control settings of the primary device and the system host, it is necessary to perform an internal system check. By changing the status of the primary device and setting the status of the primary device within the system, it is checked whether the logical interlock works. If all interlocks can normally interlock the primary device within the system, the system is normal and can be put into operation.

8. The control method according to claim 5, characterized in that: In step S3, all collected primary equipment status data are backed up and stored in the system host, and all operations and changes are recorded.

9. The control method according to claim 5, characterized in that: In step S4, after an erroneous operation alarm occurs, the next operation can only be performed after the staff confirms the restoration; after several operational errors, the system is locked, and the staff cannot perform operations after confirmation. The staff needs to enter the system host to restore before continuing the operation.

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