SFC output disconnecting link operation optimization method

Abstract

The invention discloses an SFC output disconnecting link operation optimization method, which comprises the following steps of: adjusting an SFC output disconnecting link operation mode to be normally closed, adjusting a control mode to be in-situ manual opening and closing operation, and optimizing a program participating in SFC output disconnecting link process calling in a water pumping and starting process; and meanwhile, a judgment condition for avoiding loop closing of the electrical shaft is added into a water pumping starting condition judgment logic. The method has the characteristic that the failure rate can be effectively reduced.

Description

Technical Field

[0001] The invention relates to an SFC output switch operation method, in particular to an SFC output switch operation optimization method. Background Art

[0002] The SFC output switch of some pumped-storage power stations is in the normally open mode. When the unit starts pumping water to establish the electrical axis, the switch receives the command to close from the monitoring process. This operation mode causes the SFC output switch to open and close frequently, increasing the risk of damage to the primary mechanism of the switch. As the unit's operating years increase, this risk continues to increase. At the same time, the mechanism of the SFC output switch, which is in the normally open mode, moves frequently, increasing the workload of primary maintenance, and the maintenance work on the output switch will affect the pumping start of the unit in the corresponding electrical circuit, weakening the reliability of the unit's operation. Therefore, the existing technology has the problem of frequent operation and high failure rate of the SFC output switch of the pumped-storage power station. Summary of the invention

[0003] The purpose of the present invention is to provide a method for optimizing the operation of an SFC output switch. The present invention has the characteristic of being able to effectively reduce the failure rate.

[0004] The technical solution of the present invention is: an SFC output knife switch operation optimization method, which adjusts the SFC output knife switch operation mode to normally closed, adjusts the control mode to on-site manual opening and closing operation, and optimizes the program involved in the SFC output knife switch process call during the pumping start-up process; at the same time, a condition for avoiding electrical shaft closing is added to the pumping start-up condition judgment logic.

[0005] In the aforementioned SFC output switch operation optimization method, the specific process of optimizing the program involved in the SFC output switch process call during the water pumping start-up process is: the logical function of issuing orders to open and close the SFC output switch during the water pumping start-up process is deleted, and the judgment logic of the SFC output switch control mode being at a remote location in the water pumping start-up judgment condition is cancelled, and at the same time, the SFC output switch validity signal no longer judges that the switch is at a remote location.

[0006] In the aforementioned SFC output switch operation optimization method, the specific process of avoiding the electrical shaft closing judgment condition is: adding a judgment condition for judging that all other units are not in the pumping start-up process into the dragging process start-up judgment criterion and adding a judgment criterion for judging whether the dragging switches of all units and the dragged switches are in separate positions.

[0007] In the aforementioned SFC output switch operation optimization method, in the criteria for determining whether the electrical shaft of the unit is established or disconnected, the logic of determining whether the SFC output switch is in the open position when the electrical shaft is not established is cancelled, and the logic of determining whether the SFC output switch is in the open position when the electrical shaft is disconnected is cancelled.

[0008] Compared with the prior art, the present invention adjusts the SFC output knife switch operation mode from normally open to normally closed, effectively reducing the risk of accidents caused by mechanical fatigue of the SFC output knife switch and effectively reducing the failure rate; at the same time, the SFC output knife switch operation mode is adjusted accordingly, and the related pumping start process and the locking logic of other units of the electrical axis are optimized and adjusted, while optimizing the SFC output knife switch operation mode, ensuring that the pumping start will not appear in the closed loop operation, fully ensuring the safe and stable operation of the pumped storage unit. In summary, the present invention has the characteristics of being able to effectively reduce the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of an electrical shaft of the present invention;

[0010] Figure 2 It is a schematic diagram of the pumping process calling program of the present invention;

[0011] Figure 3 It is a schematic diagram of the pumping start-up conditions of the present invention;

[0012] Figure 4 This is a schematic diagram of the disconnection condition of the electrical shaft of the pump starter;

[0013] Figure 5 This is a schematic diagram of the conditions for establishing the electrical shaft of the pump starter. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0015] Example. A method for optimizing the operation of an SFC output knife switch includes the change of the output knife switch operation mode and the optimization design of the related locking logic, and the main contents are: 1. The operation mode of the SFC output knife switch is changed to normally closed, not separated or closed with the start-up process, and the control mode is manually separated or closed on site; 2. The part of the SFC output knife switch involved in the process call is deleted, and the SFC output knife switch is no longer ordered to be separated or closed in the unit pumping start-up process; 3. The unit pumping start-up judgment criterion is modified to judge that the SFC output knife switch is closed and not separated (the same flow channel unit only judges the output knife switch of this circuit) and other units are not in the dragging process & all the unit start knives and drag knives are in the open position (to prevent the occurrence of a closed loop); 4. The judgment condition of electrical shaft establishment / pre-establishment is changed to that the SFC output knife switch is closed and not separated; 5. The judgment criterion related to the SFC output knife switch is deleted from the electrical shaft disconnection judgment criterion (the knife switch is normally closed, which will cause the electrical shaft disconnection condition to always be established); 6. The condition for judging that the SFC output knife switch control mode must be remote is set, and the control mode must no longer be judged to be remote.

[0016] The specific implementation contents are as follows:

[0017] 1) If Figure 1 As shown in the figure, change the operation mode of the SFC output switch from normally open to normally closed;

[0018] 2) Due to the adjustment of the operation mode of the SFC output switch, some programs involved in the process call in the original program have been optimized. The logical function of issuing the command to open and close the SFC output switch during the pumping start process has been deleted; the operation mode of the SFC output switch has been adjusted to local manual operation, and the judgment logic of the SFC output switch control mode being remote in the pumping start judgment condition has been cancelled. At the same time, the SFC output switch validity signal no longer judges that the switch is remote, such as Figure 2 , Figure 3 shown.

[0019] After the SFC output knife switch operation mode was changed from normally open to normally closed, the risk of electrical shaft closing increased. To avoid such accidents, optimization was made in the pumping start condition judgment logic. The judgment condition for judging whether all other units are not in the pumping start process was added to the dragging process start judgment. At the same time, the judgment condition for judging whether all units' dragging knife switches and the dragged knife switches are in the open position was added to the dragging process start judgment. Combined with the above logic optimization, the risk of closing the loop caused by the dragging knife switches of other units in the closed position while the unit continues to execute the pumping process and closes the dragging knife switch of the unit can be avoided from the source. Figure 4 shown.

[0020] In the old process, there is a logic that the SFC output knife switch is closed first and then opened. This operation mode increases the risk of mechanical fatigue damage to the primary equipment of the knife switch. After the operation mode of the SFC output knife switch is changed from normally open to normally closed, the criteria for judging the establishment and disconnection of the unit electrical axis in the corresponding process are also optimized accordingly. The logic of judging that the SFC output knife switch is in the open position when the electrical axis is not established is cancelled, and the logic of judging that the SFC output knife switch is in the open position when the electrical axis is disconnected is cancelled. For example, Figure 5 shown.

Claims

1. A method for optimizing the operation of an SFC output switch, characterized in that: The operation mode of the SFC output knife switch is adjusted to normally closed, and the control mode is adjusted to on-site manual opening and closing operation, and the program involved in the SFC output knife switch process call during the pumping start-up process is optimized; at the same time, a condition to avoid electrical shaft closing is added to the pumping start-up condition judgment logic.

2. The SFC output switch operation optimization method according to claim 1 is characterized in that: The specific process of optimizing the program involved in the SFC output switch process call during the pumping start-up process is as follows: the logical function of issuing orders to open and close the SFC output switch during the pumping start-up process is deleted, and the judgment logic of the SFC output switch control mode being at a remote location in the pumping start-up judgment condition is cancelled. At the same time, the SFC output switch validity signal no longer judges that the switch is at a remote location.

3. The SFC output switch operation optimization method according to claim 1 is characterized in that: The specific process of avoiding the electrical shaft closing judgment condition is: adding the judgment condition that all other units are not in the pumping start process in the dragging process start-up judgment criteria and adding the judgment criteria that the dragging knife switches and the dragged knife switches of all units are in the open position.

4. The SFC output switch operation optimization method according to claim 1, characterized in that: In the criteria for determining whether the electrical shaft of the unit is established or disconnected, the logic for determining whether the SFC output switch is in the open position when the electrical shaft is not established is cancelled, and the logic for determining whether the SFC output switch is in the open position when the electrical shaft is disconnected is cancelled.

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