Power system rapid operation risk assessment method based on power flow transfer and tracking

Abstract

The invention provides a power system rapid operation risk assessment method based on power flow transfer and tracking. The method comprises the following steps: initializing parameters; extracting a system operation state based on non-sequential Monte Carlo simulation; analyzing a system state by adopting an improved load flow calculation method and a load reduction model based on load flow tracking; and calculating an operation risk assessment index. The fast load flow calculation is improved by deducing a node transfer distribution factor and a branch breaking distribution factor suitable for multi-branch breaking; a load reduction model based on power flow tracking is established, a most effective control node set is screened out by adopting a power flow tracking theory, optimization in a whole system range is converted into optimization in a local range, and an improved rapid power flow calculation method and the load reduction model are applied to power system operation risk assessment, so the assessment precision is higher; meanwhile, the evaluation efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a power system rapid operation risk assessment method based on power flow transfer and tracking. Background technique [0002] In recent years, there have been many power system blackouts around the world, which have caused certain economic losses to the country and residents. In order to reduce the occurrence of similar power accidents and ensure the safe and stable operation of the power system, the risk assessment of power system operation has attracted extensive attention from various countries. Due to the complex structure and numerous components of the power system, risk assessment requires state analysis of a large number of fault scenarios, especially power flow iterative calculations and load reduction calculations for multiple fault scenarios, which cannot meet the timeliness of operational risk assessment. Therefore, improving the efficiency of state analysis ...

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Problems solved by technology

In terms of power flow calculations, Zhang Jun, Shen Shen, Liu Feng and others proposed a calculation method for the joint distribution of power systems with multiple wind farms (Patent No.: CN201610868051.5). In a power system with wind farms, by generating The distributed transfer factor quickly calculates the line power change caused by the wind power forecast error, but lacks the node transfer factor to describe the line power change caused by the combined change of power generation and load; Ren Jianwen, Yi Chen, and He Peicheng proposed a virtual branch model based on FTIL The multi-branch power flow transfer search algorithm (patent number: CN201610894006.7), on the basis of double-branch disconnection, based on the virtual branch model, the multi-branch fault is converted into a double-branch fault, and the branch disconnection is deduced However, when calculating the multi-branch outage distribution factor, there are too many equivalent times and the calculation is complicated; in terms of load reduction calculation, Mo Wenxiong, Wang Hongbin, Luan Le and others proposed a method to determine the amount of power system load reduction And the system (patent number: CN201710743244.2), by calculating the sensitivity of the off-limit branch power to the node injection power, the high-sensitivity nodes are selected as the load reduction range, which improves the calculation efficiency of the load reduction, but the process of solving the sensitivity index is relatively complex. complex

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