A Reliability Assessment Method for Urban Power Grids Considering Generation, Transmission and Distribution Systems

Abstract

The embodiment of the invention provides an urban power grid reliability evaluation method taking power generation, power transmission and power distribution systems into integrated consideration. The method mainly comprises the following steps: first of all, an urban power grid is divided into a power transmission network layer, a high-voltage distribution network layer and an intermediate-voltage distribution network layer; according to data of a power transmission network, calculating a reliability index of the power transmission network layer by use of a set algorithm, and converting the reliability index at a bus of the power transmission network layer into a power supply of the high-voltage distribution network layer through an equivalent power supply mode; converting a reliability index of a terminal bus at the high-voltage distribution network layer into a power supply of the intermediate -voltage distribution network layer through an equivalent power supply mode; and according to data of the intermediate-voltage distribution network layer, calculating a reliability index of the intermediate-voltage distribution network layer by use of the set algorithm. The urban power grid integrated reliability evaluation method provided by the embodiment of the invention effectively avoids the defect of only individual reliability evaluation of a power transmission network or a power distribution network, takes influences exerted by the power transmission network on the power distribution network into integrated consideration, and can truly reflect the power reliability of a power system.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for evaluating the reliability of an urban power grid which comprehensively considers power generation, power transmission and power distribution systems. Background technique [0002] Reliability represents the ability of the system to ensure the function of meeting user needs. Power system reliability is a measure of the power system's ability to supply power and energy to power users uninterruptedly in accordance with acceptable quality standards and required quantities. Power system reliability includes two aspects of adequacy and safety. [0003] Sufficiency refers to the ability of the power system to maintain the continuous supply of the total power demand and the total power energy of users, taking into account the planned outage of system components and the reasonable expectation of unplanned outage. Sufficiency is also called static reliability, that i...

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Problems solved by technology

Therefore, when evaluating the reliability of any one of the subsystems, it is assumed that the other subsystems are completely reliable, and the interaction between subsystems is not considered. Although this reduces the complexity of the research, it cannot truly describe the overall power grid. reliability, and obviously cannot truly reflect the actual situation of the power system

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