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An n-k fault analysis method for power systems based on two-level programming
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A fault analysis method and power system technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as not getting rid of the framework of combination traversal
Active Publication Date: 2019-10-11
SUQIAN POWER SUPPLY COMPANY OF JIANGSU PROVINCE POWER +2
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Problems solved by technology
[0005] The above research has achieved certain results in improving the computational efficiency of power system N-K fault analysis, but it still does not get rid of the framework of combinatorial traversal
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Embodiment 1
[0100] Example 1: IEEE-14 node calculation system
[0101] Firstly, the IEEE-14 node system is taken as an example for description. See Table 1 for IEEE-14 node system network parameters, Table 2 for generator data, and Table 3 for load data. Set the population size to 100, the crossover probability to 1.0, and the mutation probability to 0.001.
[0102] Table 1: IEEE-14 node system network parameters
[0103]
[0104] Table 2: Generator Set Data
[0105]
[0106] Table 3: Load Data
[0107]
[0108] In order to illustrate the effectiveness of the method of the present invention, the calculation results of the present invention are compared with the calculation results of the traditional combined traversal method. When K takes different values, the calculation results are shown in the table below.
[0109] Table 4: Comparison of Results
[0110]
[0111] It can be seen that the calculation results of this method are consistent with the calculation results of ...
Embodiment 2
[0112] Example 2: 4.2 IEEE-118 node calculation system
[0113]In order to illustrate the advantages of this method in the security analysis of large-scale power grids, the IEEE-118 node calculation system is further illustrated as an example. The system contains 186 lines, 54 units, and 91 load nodes. If the pre-screening of the expected accident set is not included, when K=3, the number of faults traversed by the combination will exceed 1 million, and when K=4, the number of faults traversed by the combination will be close to 50 million. The traditional method is obviously difficult to apply directly, and it is necessary to take heuristic simplification measures such as reducing the expected accident set and fault ranking. The method in this paper can effectively reduce the calculation time through intelligent search.
[0114] Taking K=3 as an example, the computer configuration is an AMD A8-6410 processor, the main frequency is 2.0GHz, and the memory is 4G. The tradition...
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Abstract
The invention discloses a two-layer planning-based electric power system N-K fault analysis method, and relates to fault analysis of an electric power system. The fault analysis method comprises the following steps: for an upper layer problem: establishing a mathematical model in a direct current power flow condition, and determining an upper layer problem target function; in a condition of a given fault multiple number, obtaining a fault combination which can cause the maximum of power grid load shedding quantity; for the lower layer problem: performing simulation on an operating condition after power grid suffers from an accident specific to the fault combination in the upper layer problem decision making in the step 1); when various kinds of operating constraint conditions of the power grid are satisfied, determining the power grid load shedding quantity by regulating the output power of a generator unit to be the minimum; and when the upper layer problem target function value is equal to the maximum value of the minimum power grid load shedding quantity caused by each fault combination, obtaining the fault combination which causes the maximum of the power grid load shedding quantity. By adoption of the method, the power grid operation constraint and a re-correction process after the power grid accident are taken into full consideration, and the actual operation of the power grid can be satisfied.
Description
technical field [0001] The N-K fault analysis method of the power system based on the two-level planning of the present invention relates to the fault analysis of the power system. Background technique [0002] Power system N-K fault analysis is a common method in power system planning and operation, which is used to check whether the system operation status is within the allowable safe range after K components in the system are out of service. The value of K is generally 1~2, which is the common N-1 or N-2 check. The major power outages at home and abroad in recent years show that it is of great significance to strengthen the analysis of serious N-K faults (K ≥ 2) in the power grid, identify and prevent cascading faults, and ensure the safe and reliable operation of large power grids. [0003] The traditional N-K fault analysis of power system needs to combine and traverse the possible accidents in the expected accident set. For each fault combination, in the analysis, it...
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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 刘新山刘国静李娟尹兵曹明尹永昌周遥王荣
Owner SUQIAN POWER SUPPLY COMPANY OF JIANGSU PROVINCE POWER
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