Power transmission network expansion and energy storage configuration combined planning method based on large-scale wind power access

Abstract

The invention provides a power transmission network expansion and energy storage configuration combined planning method based on large-scale wind power access, and belongs to the field of power grid planning considering new energy power generation and consumption. According to the method, by combining multi-scene random planning and operation simulation, a hybrid optimization method considering wind power uncertainty and energy storage life loss is provided; a random output scene of full-year wind power-load can be considered, and the influence of the energy storage life loss on a combined planning result can be considered; and finally, solving is performed to obtain a reasonable and effective power transmission network expansion and energy storage configuration scheme. The method can be applied to the field of combined planning of power transmission network expansion and energy storage configuration under the large-scale wind power access; and an obtained configuration result can notonly effectively relieve the problem of difficulty in grid connection of wind power generation but also improve the utilization efficiency of a power transmission line, thereby relieving line blockage.

Description

technical field [0001] The invention belongs to the field of grid planning considering new energy generation and consumption, and specifically relates to a joint planning method for transmission grid expansion and energy storage configuration including large-scale wind power access. Background technique [0002] According to the "2017 Global Renewable Energy Status Report", China's installed capacity of renewable energy (excluding hydropower) ranks first in the world. However, the output of renewable energy units such as wind power has strong volatility and intermittency, which restricts its large-scale development, and serious wind curtailment problems have emerged in our country. According to the statistics of the National Energy Administration, in 2017, my country's annual wind power generation accumulatively reached 305.7 billion kWh, accounting for 4.8% of the total power generation; however, the annual abandoned wind power reached 41.9 billion kWh, with an average wind...

AI Technical Summary

Problems solved by technology

Among the existing technologies, some technologies only consider the impact of typical daily load and extreme daily load scenarios on planning, and do not consider the uncertainty of wind power connected to the grid; some technologies only consider the fixed power and capacity to be expanded. energy system, ignoring the fact that the power and capacity of energy storage in actual investment planning are often variable; some technologies consider the impact of energy storage life loss on joint planning results, but the way they deal with the impact of energy storage life will vary. Leading to a significant increase in the number of state variables of the original programming problem, the solution is too difficult

On the whole, there is still a lack of a joint planning technology that considers the capacity and power of energy storage as variables, while considering the uncertainty of wind power and load, and the life of energy storage.

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