Simulation method of grid cascading faults based on complex network theory and corrective control

Abstract

The invention relates to a method for simulating a power grid interlocking fault based on complicated network theoretical calculation and correction control, and belongs to the technical field of safety and reliability protection of power systems. The method comprises the following steps of utilizing a computer, and performing procedures; firstly, calculating the optimum trend of a power system under the normal condition; calculating the betweenness of each node, determining a betweenness threshold value of each node of the power system, simulating the interlocking fault of the power system, and finally calculating the total loss load of the interlocking fault. The method has the advantages that under the condition of meeting the safety running constraint requirement of the power system, the influence of correction control on the interlocking fault can be simulated by adjusting the output power and reduced load of a power generator, the influence of the change of load distribution on the interlocking fault can be reflected, and the propagation process of the interlocking fault of the power system can be well reflected; the method is widely applied to simulate the interlocking fault of the power system, is particularly suitable for simulating the interlocking fault of large complicated power systems, and can provide scientific basis for preventing the occurrence of the interlocking fault of the power system.

Description

technical field [0001] The invention belongs to the technical field of power system safety and reliability protection, and in particular relates to a grid cascading failure simulation method based on complex network theory calculation and correction control. Background technique [0002] With the continuous expansion of the scale of the power system and the continuous growth of power generation, the safety and reliability of the power system operation has attracted more and more attention, and the safety analysis of the power system has become increasingly important. Power system safety analysis is the analysis of the operating state of the system after the expected accident. Anticipated accidents refer to hypothetical accidents for analyzing the safety and reliability of power systems, such as assuming that generators, lines, transformers, and even power plants or substations are out of operation due to failure or attack. After the accident is expected, the power flow in t...

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Problems solved by technology

The main disadvantages of this method are: ①The correction control measures adopt the assumption that the parameters of each circuit can be adjusted, which is inconsistent with the actual system operation; ②Assume that each circuit of the power system can be installed with flexible AC transmission (FACTS ) components, which is difficult to realize in practice; ③ only by adjusting the correction control measures of line parameters, because the power flow analysis is not performed on the power grid after each fault occurs, it cannot effectively reduce and suppress the system after the node is removed. Overload leads to non-convergence of power flow, and even the occurrence of power outages in the entire network; ④ only simulates cascading failures at the topological level, and cannot reflect the impact of load distribution changes on cascading failures under the same topology of the power grid

Therefore, using this method to simulate cascading faults in the power system cannot truly reflect the inhibitory effect of correction control on the cascading fault propagation process, and has a large gap with the cascading fault propagation process of the actual power system, so it cannot provide a basis for the safety and reliability protection of the power system , cannot effectively avoid the occurrence of large-scale blackouts in the power system

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