A fast setting method and system for optimal reclosing time
A technology of reclosing and timing, applied in the direction of automatic disconnection emergency protection devices, AC network circuits, electrical components, etc., can solve the problems of difficult to guarantee the speed and accuracy of search strategies, difficult engineering applications, and low robustness, etc. Achieve the effect of optimizing reclosing time, improving search speed and good transient stability
Active Publication Date: 2021-08-31
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology
Some engineers also believe that the minimum speed moment of the short-circuit fault trajectory is the optimal reclosing moment. Although it is relatively simple and fast, the robustness of the conclusion is not high, and it is difficult to guide the actual engineering application
The existing optimal reclosing time is still difficult to quickly set online, and the bottleneck is that the speed and accuracy of the search strategy cannot be guaranteed at the same time
Method used
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Embodiment 1
[0044] The present invention proposes a fast setting method for optimal reclosing time, such as figure 1 A flow chart of a fast setting method for optimal reclosing time is given.
[0045] Start the process.
[0046] In step 1, the minimum action time t of the reclosing device is obtained r.min , the minimum action time t of the reclosing device r.minIt is equal to the time T1 for the arc at the fault point to be extinguished and the surrounding medium to recover its dielectric strength, the time T2 for the recovery of the dielectric strength around the contacts of the reclosing device after the circuit breaker trips, and the time T2 for the arc chamber to be filled with oil again and the operating mechanism to return to its original state and be ready to operate again The sum of time T3.
[0047] In step 2, simulate the short-circuit fault scenario without reclosing, set the search time range according to the simulation trajectory, and determine the initial search value of...
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The present invention proposes a fast setting method and system for optimal reclosing time. The method obtains the minimum action time of the reclosing device; simulates the short-circuit fault scene without reclosing, sets the search time range according to the simulation trajectory, and searches When the time range is greater than the minimum action time, the initial search value of the optimal reclosing time is determined according to the simulation trajectory; starting from the initial search value, the optimal reclosing time is determined using the pre-set transient stability reclosing time function within the search time range The iterative search solution is carried out at the switching time; the result of each step of the iterative search is the sensitivity of the influence of the reclosing time on the transient stability; when the sensitivity of the reclosing time to the transient stability is 0, the optimal reclosing time is obtained by setting . Based on the method, a tuning system is also proposed. By optimizing the reclosing time, the invention makes the transient stability of the permanent fault reclosing best and coordinates the search accuracy and speed of the optimal reclosing time.
Description
technical field [0001] The invention belongs to the technical field of electric power system and automation thereof, and in particular relates to a method and system for fast setting of optimal reclosing time. Background technique [0002] Line protection is generally equipped with an automatic reclosing device. Reclosing after instantaneous faults can ensure system integrity and improve system power supply reliability. However, if the fault that occurs is permanent, the automatic reclosure may cause a secondary short circuit in the system. It is still difficult for existing reclosing devices to accurately distinguish between transient faults and permanent faults. Therefore, it is necessary to consider the risk of transient stability caused by permanent faults when setting the reclosing time. [0003] Considering the optimal reclosing moment of secondary short-circuit transient stability is also referred to as the optimal reclosing moment. Traditional research mainly pert...
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IPC IPC(8): H02J3/00H02H3/06H02H7/26
CPCH02H3/066H02H7/262H02J3/00H02J2203/20
Inventor 李晨昊王昕李玉敦
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY