Calculation method for switching-on and switching-off operation synchronization time of power equipment

Abstract

The invention discloses a power equipment opening and closing operation synchronization time calculation method, and relates to the technical field of power systems. According to the method, the opening and closing travel time of the circuit breaker is calculated according to SOE data of historical opening and closing operation records of the circuit breaker, the closing time is shortened when the closing synchronization time of the circuit breaker is calculated, and the opening time is advanced before a zero crossing point when the opening synchronization time of the circuit breaker is calculated, so that arc discharge of the circuit breaker is before and after the zero crossing point, and the current during arc discharge can be reduced; and the failure rate of equipment is reduced.

Description

Technical Field

[0001] The invention relates to the technology of power system, in particular to the technology of a method for calculating the synchronous time of opening and closing operation of power equipment. Background Art

[0002] When power equipment is opened or closed, if a large current flows through the equipment, an arc will be generated. Severe arcs will damage the equipment and endanger its safety.

[0003] The position of a circuit breaker using dual remote signals usually includes two state points: the open position and the closed position. When the circuit breaker changes from open to closed, the open position changes first, and then the closed position changes; when the circuit breaker changes from closed to open, the closed position changes first, and then the open position changes.

[0004] When the generator is connected to the grid, the two sides of the circuit breaker have different frequencies, or the two sides of the circuit breaker have different phases, it is necessary to calculate the synchronous closing time; when the generator is off the grid, or the circuit breaker is opened, it is also necessary to calculate the synchronous opening time to ensure that the current is as small as possible during opening and closing. At present, there is no effective method for calculating the synchronous opening and closing time of the circuit breaker. There is a defect of large arc current when the circuit breaker is opened and closed, which easily leads to failure of related equipment. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a method for calculating the synchronization time of opening and closing operations of power equipment, which can reduce arcing when the circuit breaker is opened and closed, thereby reducing the failure rate of related equipment.

[0006] In order to solve the above technical problems, the present invention provides a method for calculating the synchronization time of opening and closing operations of power equipment, which is characterized by the following specific steps:

[0007] 1) Obtain the SOE data of each circuit breaker from the historical opening and closing operation records of the circuit breaker. The SOE data of the circuit breaker includes:

[0008] When the circuit breaker is closed, the moment when the circuit breaker is in the open position and the moment when the circuit breaker is in the closed position:

[0009] When the circuit breaker is opened, the moment when the circuit breaker is in the open position and the moment when the circuit breaker is in the closed position;

[0010] 2) Calculate the travel time of the circuit breaker opening and closing. The specific calculation formula is:

[0011]

[0012] Wherein, Tclose is the closing travel time of the circuit breaker, M is the number of closed circuit breakers, Tclose_CSOE.j is the moment when the circuit breaker is in the closed position in the SOE data of the jth closed circuit breaker, and Tclose_FSOE.j is the moment when the circuit breaker is in the open position in the SOE data of the jth closed circuit breaker;

[0013] Among them, Topen is the circuit breaker opening travel time, N is the number of open circuit breakers, Topen_FSOE.j is the moment when the circuit breaker is in the open position in the SOE data of the j-th open circuit breaker, and Topen_CSOE.j is the moment when the circuit breaker is in the closed position in the SOE data of the j-th open circuit breaker;

[0014] 3) When the circuit breaker closing operation is required, the circuit breaker closing synchronization time Tclose_control is calculated, and the circuit breaker closing command is immediately issued after the current time is delayed by the synchronization time Tclose_control;

[0015] When the circuit breaker opening operation is required, the circuit breaker opening synchronization time Topen_control is calculated, and the circuit breaker opening command is immediately issued after the current time delay synchronization time Topen_control;

[0016] The specific calculation formula for calculating the circuit breaker closing synchronization time Tclose_control is:

[0017] Tclose_control=diffAngc / (360 / f1-360 / f2)-Tcolse

[0018] Among them, Tclose_control is the closing synchronization time of the circuit breaker, diffAngc is the current phase angle difference on both sides of the circuit breaker during the closing operation, and f1 and f2 are the electrical frequencies on both sides of the circuit breaker during the closing operation;

[0019] The specific calculation formula for calculating the circuit breaker opening synchronization time Topen_control is:

[0020] Topen_control=Angf / (360 / f1)-Topen / 2

[0021] Among them, Topen_control is the circuit breaker opening synchronization time, Angf is the current phase angle of the circuit breaker during the opening operation, and f1 is the electrical frequency of the circuit breaker during the opening operation.

[0022] The method for calculating the synchronous time of opening and closing operations of electric power equipment provided by the present invention calculates the opening and closing travel time of the circuit breaker according to the SOE data of the historical opening and closing operation records of the circuit breaker, shortens the closing time when calculating the closing synchronous time of the circuit breaker, and advances the opening time before the zero crossing point when calculating the opening synchronous time of the circuit breaker, so that the circuit breaker arcs before and after the zero crossing point, which can reduce the current during arcing, protect the reliable operation of the equipment, reduce the failure rate of the equipment, and improve the operating life of the equipment. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments, but this embodiment is not intended to limit the present invention. All similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention represent the relationship of and, and the English letters in the present invention are case-sensitive.

[0024] An embodiment of the present invention provides a method for calculating the synchronization time of opening and closing operations of power equipment, characterized in that the specific steps are as follows:

[0025] 1) Obtain the SOE (Sequence of Events) data of each circuit breaker from the historical opening and closing operation records of the circuit breaker. The SOE data of the circuit breaker includes:

[0026] When the circuit breaker is closed, the moment when the circuit breaker is in the open position and the moment when the circuit breaker is in the closed position:

[0027] When the circuit breaker is opened, the moment when the circuit breaker is in the open position and the moment when the circuit breaker is in the closed position;

[0028] 2) Calculate the travel time of the circuit breaker opening and closing. The specific calculation formula is:

[0029]

[0030] Wherein, Tclose is the closing travel time of the circuit breaker, M is the number of closed circuit breakers, Tclose_CSOE.j is the moment when the circuit breaker is in the closed position in the SOE data of the jth closed circuit breaker, and Tclose_FSOE.j is the moment when the circuit breaker is in the open position in the SOE data of the jth closed circuit breaker;

[0031] Among them, Topen is the circuit breaker opening travel time, N is the number of open circuit breakers, Topen_FSOE.j is the moment when the circuit breaker is in the open position in the SOE data of the j-th open circuit breaker, and Topen_CSOE.j is the moment when the circuit breaker is in the closed position in the SOE data of the j-th open circuit breaker;

[0032] 3) When the circuit breaker closing operation is required, the circuit breaker closing synchronization time Tclose_control is calculated, and the circuit breaker closing command is immediately issued after the current time is delayed by the synchronization time Tclose_control;

[0033] When the circuit breaker opening operation is required, the circuit breaker opening synchronization time Topen_control is calculated, and the circuit breaker opening command is immediately issued after the current time delay synchronization time Topen_control;

[0034] The specific calculation formula for calculating the circuit breaker closing synchronization time Tclose_control is:

[0035] Tclose_control=diffAngc / (360 / f1-360 / f2)-Tcolse

[0036] Among them, Tclose_control is the closing synchronization time of the circuit breaker, diffAngc is the current phase angle difference on both sides of the circuit breaker during the closing operation, and f1 and f2 are the electrical frequencies on both sides of the circuit breaker during the closing operation;

[0037] The specific calculation formula for calculating the circuit breaker opening synchronization time Topen_control is:

[0038] Topen_control=Angf / (360 / f1)-Topen / 2

[0039] Among them, Topen_control is the circuit breaker opening synchronization time, Angf is the current phase angle of the circuit breaker during the opening operation, and f1 is the electrical frequency of the circuit breaker during the opening operation.

Claims

1. A method for calculating the synchronization time of opening and closing operations of power equipment, characterized in that: The specific steps are as follows: 1) Obtain the SOE data of each circuit breaker from the historical opening and closing operation records of the circuit breaker. The SOE data of the circuit breaker includes: When the circuit breaker is closed, the moment when the circuit breaker is in the open position and the moment when the circuit breaker is in the closed position: When the circuit breaker is opened, the moment when the circuit breaker is in the open position and the moment when the circuit breaker is in the closed position; 2) Calculate the travel time of the circuit breaker opening and closing. The specific calculation formula is: Wherein, Tclose is the closing travel time of the circuit breaker, M is the number of closed circuit breakers, Tclose_CSOE.j is the moment when the circuit breaker is in the closed position in the SOE data of the jth closed circuit breaker, and Tclose_FSOE.j is the moment when the circuit breaker is in the open position in the SOE data of the jth closed circuit breaker; Among them, Topen is the circuit breaker opening travel time, N is the number of open circuit breakers, Topen_FSOE.j is the moment when the circuit breaker is in the open position in the SOE data of the j-th open circuit breaker, and Topen_CSOE.j is the moment when the circuit breaker is in the closed position in the SOE data of the j-th open circuit breaker; 3) When the circuit breaker closing operation is required, the circuit breaker closing synchronization time Tclose_control is calculated, and the circuit breaker closing command is immediately issued after the current time delay synchronization time Tclose_control; When the circuit breaker opening operation is required, the circuit breaker opening synchronization time Topen_control is calculated, and the circuit breaker opening command is immediately issued after the current time delay synchronization time Topen_control; The specific calculation formula for calculating the circuit breaker closing synchronization time Tclose_control is: Tclose_controldiffAngc / (360 / f1360 / f2)Tcolse Among them, Tclose_control is the closing synchronization time of the circuit breaker, diffAngc is the current phase angle difference on both sides of the circuit breaker during the closing operation, and f1 and f2 are the electrical frequencies on both sides of the circuit breaker during the closing operation; The specific calculation formula for calculating the circuit breaker opening synchronization time Topen_control is: Topen_control=Angf / (360 / f1)-Topen / 2 Among them, Topen_control is the circuit breaker opening synchronization time, Angf is the current phase angle of the circuit breaker during the opening operation, and f1 is the electrical frequency of the circuit breaker during the opening operation.

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