Dispatching master station-oriented power grid frequency disturbance source positioning method

Abstract

The invention discloses a dispatching master station-oriented power grid frequency disturbance source positioning method. The method comprises the following steps of: acquiring full-area system frequency and power plant unit power by using a WAMS data acquisition system to form a system frequency and power plant unit power parameter library; according to the system frequency data, distinguishing the system frequency by adopting a prony algorithm to obtain a dominant mode disturbance frequency, a disturbance amplitude and a damping ratio, and judging whether frequency disturbance occurs in thesystem or not according to the dominant mode disturbance frequency, the disturbance amplitude and the damping ratio; and if the frequency disturbance occurs, obtaining the correlation between the system frequency and the power data trend of each unit, determining the assistant increasing attribute of the unit power to the system frequency through the correlation, and determining the unit or the unit group causing the disturbance to the system frequency through the correlation sorting on the premise of the assistant increasing attribute so as to judge the disturbance source. The method can quickly and effectively position the disturbance source of the power plant, specifically arrives at the unit, provides decision-making assistance for the next action of a dispatcher, and guarantees the normal and safe operation of a power grid.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability monitoring, relates to frequency fluctuation monitoring based on WAMS, and in particular to a method for locating frequency disturbance sources of a power grid oriented to a dispatching master station. Background technique [0002] During the operation of the power grid, system failure (test) or DC unblocking, new energy output or large user load fluctuations, and power plant output fluctuations will all cause system frequency fluctuations. The first two types of factors can be known in advance or easily discovered, while power plant output fluctuations It often takes a lot of analysis after the event to be discovered. If it is not discovered in time, it may cause hidden dangers to the safety of the power grid and affect the normal operation of the power grid. Therefore, when the frequency disturbance is caused by the output fluctuation of the power plant, quickly and effe...

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Problems solved by technology

[0002] During the operation of the power grid, system failure (test) or DC unblocking, new energy output or large user load fluctuations, and power plant output fluctuations will all cause system frequency fluctuations. The first two types of factors can be known in advance or easily discovered, while power plant output fluctuations It often takes a lot of analysis after the event to be discovered. If it is not discovered in time, it may cause hidden dangers to the safety of the power grid and affect the normal operation of the power grid. Therefore, when the frequency disturbance is caused by the output fluctuation of the power plant, quickly and effectively locating the disturbance source of the power plant is very important to the dispatcher. It is of great significance, but there are many power plants and units in the power grid, it is difficult for the dispatcher to quickly find out the disturbance source, and it is impossible to take further measures to eliminate the fluctuation in time

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