Method for assessing safety value of planning scheme for electrical power system containing large-scale wind power

Abstract

The invention relates to the field of expansion planning and safety analysis on electrical power systems. In order to provide a systematized method and a relatively perfect assessment process for the safety assessment on a planning scheme, the technical scheme adopted by the invention is as follows: a method for assessing a safety value of a planning scheme for an electrical power system containing large-scale wind power comprises the following steps: 1, establishing a power supply-power grid unified planning model for taking account of static and dynamic safety values of the system; 2, beginning to carry out detailed operation simulation on candidate planning schemes; 3, after units are combined, carrying out safety assessment on the system time interval by time interval; 4, carrying out comprehensive safety control optimization on an contingency set by using a 'positive constraint and relaxation method' so as to obtain the optimal division of a preventive control contingency set and an emergency control contingency set; and 5, obtaining the total cost of the planning scheme, and taking the total cost as a basis for evaluating the planning scheme. The method disclosed by the invention is mainly applied to the expansion planning and safety analysis on the electrical power systems.

Description

technical field [0001] The invention relates to the field of expansion planning and safety analysis of electric power systems, and specifically relates to a safety value evaluation method of power system planning schemes including large-scale wind power. Background technique [0002] my country is rich in wind energy resources, and the construction of several large wind power bases has entered the overall planning of national wind power development. However, due to the intermittent and uncertain nature of wind power, its centralized access will have a great impact on the planning and operation of the power system. In addition, most of the large-scale wind power bases are located at the end of the power system, the power cannot be consumed locally, and the construction period of wind power is short, so the large-scale development of wind power must be comprehensively coordinated with other forms of power sources and power grids [1]. But at present, the research on the coordi...

AI Technical Summary

Problems solved by technology

Due to the time-varying nature of wind speed, the output of wind farms is constantly changing every moment, and it is difficult to simulate the system conditions of sudden changes in wind speed whether it is based on multi-scenario methods or methods based on probability statistics (there is a lack of reference to the planning level year-round 8760 Hour by hour or even a shorter period of time system for safety and economic optimization scheduling simulation), so it is difficult to accurately simulate the regulation (frequency modulation and peak shaving) characteristics of the system and take into account the reserve capacity of the system

Although the literature has used the Monte Carlo simulation method to evaluate the reliability of the wind power integration system planning scheme [5,6], it has not involved the dynamic security of the system after the wind power integration, and has not considered the power supply and grid planning scheme comprehensively. the effect on the environment

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