Method for evaluating reliability of power system accessing new energy

Abstract

The invention provides a method for evaluating the reliability of a power system accessing new energy and relates to the technical field of power grids, and the reliability of the power system that accesses the new energy can be reasonably evaluated. The method includes a step of establishing uncertainty models for each piece of conventional equipment, a load, and new energy in a power system, a step of sampling the states of each piece of conventional equipment, the load and the new energy, a step of establishing a load-shedding optimization model of the power system and carrying out fault state judgment with a minimum load-shedding quantity as an optimization target to obtain a minimum load-shedding quantity of the power system in a current sampling state, a step of counting a load-shedding probability and a load-shedding expected value of the power system in the current sampling state, and a step of calculating a convergence index of a target function of the load-shedding optimization model and judging whether the convergence index satisfies a set requirement or not, ending sampling if so, evaluating the reliability of the power system with the load shedding probability and theload shedding expected value as reliability evaluation indexes, and sampling again if not.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method for evaluating reliability of a power system connected with new energy sources. Background technique [0002] The power industry is an important industry that consumes fossil energy in my country. Under the general trend of energy conservation and emission reduction in recent years, with the rapid development of new energy sources such as photovoltaics, wind power, and biomass power generation, the power industry will turn to clean, high-efficiency, and low-carbon direction of development. [0003] However, with the access of large-scale new energy to the power system, the uncertainty of its output has a greater impact on the power system. Specifically, with the increasing proportion of installed capacity of new energy in the power system, the uncertainty of the capacity and output of new energy was not taken into account in the power balance calculation of the previ...

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Problems solved by technology

[0003] However, with the integration of large-scale new energy into the power system, the uncertainty of its output has a greater impact on the power system.

Specifically, with the increasing proportion of installed capacity of new energy in the power system, the uncertainty of the capacity and output of new energy was not taken into account in the power balance calculation of the previous grid planning stage, but the capacity was multiplied by the conversion The calculation result of the coefficient is used as the output of new energy units. Due to the uncertainty of the output of new energy such as wind power and photovoltaics, it will cause deviations in the estimation of the power supply and demand situation, making the planning of the power system too conservative.

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