Low frequency risk comprehensive evaluation method for nuclear power accessed to grid

Abstract

The invention discloses a low frequency risk comprehensive evaluation method for nuclear power accessed to grid, which comprises safety risk evaluation indexes with plant-grid risks combined, a low frequency risk evaluation model integrating safety and economy between the nuclear power and the power grid, and a nuclear power low frequency risk evaluation method for a low frequency safety risk transformation ratio, an index safety risk value, a device low frequency risk sensitivity and the like. The low frequency risk indexes comprise a low frequency risk index for evaluating reduction of the system frequency on the plant-grid influence degree and a device risk index based on a plant-grid low frequency protection device; the low frequency comprehensive risk model is built based on a risk theory and a plant-grid side economic index is introduced, and quantitative analysis on the low frequency risk is realized; and the risk calculation method for the safety risk transformation ratio, the index safety risk value, the device low frequency risk sensitivity and the like is easy to compare and analyze, and a basis is provided for making a protection device parameter optimization scheme and a plant-grid coordination control strategy. The structure is rigorous and clear, and requirements of risk analysis and decision are met; and model parameters have clear meaning and are easy to acquire, the modeling process is clear, quick, convenient, efficient, accuracy and strong in practicability.

Description

technical field [0001] The invention relates to the technical field of risk modeling of power systems and nuclear power plants, in particular to a low-frequency risk comprehensive assessment method for nuclear power access to a power grid. Background technique [0002] Establishing a comprehensive low-frequency risk assessment model for nuclear power integration into the grid is an important basis for improving the stable operation of the grid and the safe grid connection of nuclear power units. Nuclear power units have large single-unit capacity and high safety requirements, and are prone to interact with the power grid. Nuclear power units and their auxiliary equipment are extremely susceptible to interference from low-frequency faults in the power system. Severe low-frequency conditions will cause risks such as forced shutdown of nuclear power units, emergency shutdown, and core meltdown, and may cause large-scale power outages. The coordination and cooperation between t...

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Problems solved by technology

The safety risk method also has universal applicability and good application prospects in the risk analysis of nuclear power and power grids, but there is no relevant research and application in this field

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