Security risk assessment method for high-proportion new energy access regional power grid

Abstract

The invention provides a safety risk assessment method for a high-proportion new energy access regional power grid, and particularly provides a safety risk assessment method for a high-proportion new energy access regional power grid. The method includes the following steps: comprehensively analyzing multiple influence factors such as spatial-temporal correlation of high-proportion new energy output uncertainty, active support capability of a power grid, power prediction accuracy in extreme weather and the like, and establishing an operation risk assessment model of the high-proportion new energy access regional power grid; according to weight factors, brining the frequency out-of-limit, voltage out-of-limit, voltage collapse, line active power out-of-limit, system load loss, line random faults, insufficient new energy active support capability, poor power prediction accuracy in extreme weather and like of high-proportion new energy access regional power grid into risk index system. According to the method, a real-time online calculation and historical data fitting method is adopted, the safety risk of the high-proportion new energy accessing the regional power grid is comprehensively evaluated, and the operation risk level of the regional power grid is judged according to the risk value of each index, so that a new technical analysis means is provided for ensuring that the regional power grid consumes the new energy to the maximum extent.

Description

technical field [0001] The present invention relates to safety management of grid-connected high-proportion new energy, and more specifically, to a safety risk assessment method for high-proportion new energy connected to regional power grids. Background technique [0002] Vigorously promoting the development of renewable energy is an important means to deal with the current energy crisis and environmental problems. Due to the intermittence and volatility of new energy power generation, the high proportion of new energy access has brought great challenges to the safe and stable operation of regional power grids. Due to the weak grid structure of the regional power grid and the lack of flexible conditions and resources, problems such as voltage collapse and frequency instability are prone to occur after a high proportion of new energy is connected. How to ensure the friendly interaction between new energy and the regional power grid and the high proportion of early warning T...

AI Technical Summary

Problems solved by technology

Power grid dispatchers usually use power system power flow analysis, short-circuit current calculation, etc. for fault warning, and do not take into account the risk of wind turbine off-grid during the failure of new energy power stations. At the same time, considering that new energy power generation has a large number of power electronic equipment, As a result, new energy stations have weaker system inertia support capabilities, and are prone to external interference, leading to large-scale off-grid accidents

When the system is subjected to large frequency and voltage changes, new energy units are more likely to go off-grid, exacerbating frequency and voltage stability problems

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