Risk quantitative assessment method for emergency control measure for improving power transmission capacity of power grid

Abstract

The invention discloses a risk quantitative assessment method for emergency control measures for improving the power transmission capacity of a power grid and belongs to the technical field of power systems and automation thereof. The method considers the costs of emergency control measures such as generator tripping and load shedding, quantifies the transient stability level of an assessment system in the form of risk indicators, quantifies the risk assessment indicators of the emergency control measures for improving the power transmission capacity of the power grid, combines the system safety and stability with economy and achieves the goal of comprehensively assessing and screening the emergency control measures for improving the power transmission capacity of the power grid. The method is used for assessing and screening the emergency control measures for improving the power transmission capacity in a power system, can realize the risk quantitative assessment of the emergency control measures, and can enable operation personnel to more intuitively know the transient instability risk of the entire system, guide the operation and plan to take corresponding control measures to reduce the transient instability risk of the system and enable the system to operate at levels of higher economy and safety.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a risk quantification evaluation method for emergency control measures for improving power grid transmission capacity. Background technique [0002] The transmission capacity of the grid refers to the ability of the grid to transmit power under a series of constraints. The main factors that limit the transmission capacity of the power grid include thermal stability limitations, equipment insulation limitations, limit transmission power of ideal lines, and power system stability limitations. The dominant factors restricting the power transmission capacity of the power grid change with the development of the power grid and the change of operating characteristics. Generally speaking, in the initial stage of power grid development, the decisive constraints on the power transmission capacity of the power grid are transient...

AI Technical Summary

Problems solved by technology

[0004] At present, power planning and operation departments usually use a deterministic method to evaluate the transient stability of the system; although this method has achieved great success, there are still some problems: it does not consider the randomness of faults, relay protection and stability control device actions. and uncertainty; the selection of the accident set is arbitrary, and whether a serious accident is included in the accident set will completely change the evaluation results; ignoring non-limiting faults will affect the risk of system instability; there is no quantitative system The risk of instability, the consequences of system instability cannot be given

However, this method uses the transient instability probability of the system to evaluate the transient stability level of the whole system, and analyzes only from the instability probability or instability consequences, and does not integrate these two elements

[0005] Cross-regional power grid interconnection, large-scale new energy grid connection, and demand-side interaction pose new challenges to the operation of large power grids. The operation of large power grids will face complex and multiple uncertainties and risks; The problem is that the traditional deterministic and probabilistic methods cannot realize quantitative risk analysis, comprehensive evaluation and screening of emergency control measures to improve transmission capacity, and cannot provide effective adaptability and good scalability.

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