An evaluation method considering the impact of new energy grid integration on transmission network utilization

Abstract

The invention relates to an evaluation method considering influence of new energy grid connection on the utilization rate of transmission network. The evaluation method comprises that a photovoltaic output probability model considering influence of illumination randomness is established; a wind power output probability model considering influence of wind speed randomness is established; a load probability distribution model and a generator outage probability model are established; the trend probability distribution of lines and transformer with and without new energy is calculated respectively in a Monte Carlo probability trend method; a transmission network utilization rate index system considering the operation characteristic is defined; and the utilization rate of the transmission network is calculated via the transmission network utilization rate index system, the utilization rate indexes of the transmission network with and without new energy are compared, and influence of new energy grid connection on the utilization rate of the transmission network is obtained. The evaluation method can be used to reflect the real capacity utilization condition of lines in future, search weak links and unreasonable rack structures in the electrical network system, evaluate the utilization state of the future electrical network more accurately, and consider the influence of new energy grid connection in a concise and effective manner.

Description

technical field [0001] The invention relates to a method for evaluating the utilization rate of a transmission network. In particular, it involves an evaluation method that considers the impact of new energy grid integration on the utilization rate of the transmission network. Background technique [0002] The main contents of power system planning and design include: power demand forecasting, power supply planning and design, and grid planning and design, among which grid planning and design is the focus of power system planning and design. Its task is to determine the corresponding grid wiring to meet the requirements for reliable and economical transmission of electricity. A good grid planning scheme can not only ensure the reliable operation of the future grid, bring good economic benefits to the country and enterprises, but also meet the needs of future grid development. [0003] The evaluation of the quality of the power grid planning scheme mainly depends on the des...

AI Technical Summary

Problems solved by technology

At present, my country is vigorously developing new energy power generation. These new energy sources are intermittent, difficult to predict, and uncontrollable, which are unfriendly to the power grid.

In the existing transmission network planning practice, the evaluation of grid planning schemes is mainly to compare and select planning schemes at the technical level through power flow, stability and short-circuit calculations. However, this planning method lacks the uncertainty of future new energy power generation. Consideration of factors, including construction location, construction time, intermittent output and impact on power grid operation, etc.

Especially in the case of large-scale new energy grid connection, due to the large and rapid changes in new energy power generation throughout the year, the grid power flow fluctuates in a large range, which has a certain impact on the utilization rate of the transmission network

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