Method and system for constructing and analyzing uncertain nonlinear model of grid-connected hydropower station system

Abstract

The invention discloses a method and a system for constructing and analyzing an uncertain nonlinear model of a grid-connected hydropower station system, and belongs to the field of transient characteristic analysis of a speed regulation system of a grid-connected hydropower station. Comprising the following steps: establishing an uncertain nonlinear grid-connected operation hydropower station system model, and outputting a dynamic response based on an uncertain result under an uncertain parameter set. And analyzing the average value, the maximum value, the minimum value, the variance and the bandwidth of each state variable of the uncertain output result set at the moment t, selecting the result of the time section to draw a distribution map and a probability map, and analyzing the distribution and uncertainty of the dynamic response output results of the system when the parameters are uncertain. According to the dynamic response of a grid-connected operation hydropower station system, proposing a farthest point deviating from a system initial value and an average sensitivity index about a time sequence; and analyzing the sensitivity of parameters in specific distribution by using an EFAST method. According to the method, the dynamic characteristics, the uncertainty and the parameter sensitivity of different grid-connected operation hydropower station systems are well analyzed, and the method has good mobility.

Description

technical field [0001] The invention belongs to the field of transient characteristic analysis of the speed regulation system of a grid-connected hydropower station, and more particularly, relates to a method and system for constructing and analyzing an uncertain nonlinear model of a grid-connected hydropower station system. Background technique [0002] Hydropower stations are usually integrated into the power grid and perform the task of adjusting the frequency of the power system load together with other power stations / generators in the power grid, so that the output power of the units quickly tracks the given value. With the promotion of my country's dual carbon goals, non-water clean energy such as wind power and photovoltaics will continue to develop rapidly and be connected to the power grid on a large scale. It is highlighted that hydropower plays a very important role and status in mediating conflicts. It is a regulator for coordinating the relationship between the p...

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Problems solved by technology

Some scholars have studied the linear model of grid-connected hydropower stations before. The previous analysis methods and models are all aimed at deterministic systems, isolated grid models or single-machine infinite models, mainly focusing on the stability and dynamic characteristics of the system, and the parameters Sensitivity analysis is generally qualitative and analyzes a single parameter, and almost no one has proposed uncertainty and sensitivity analysis methods and related research for grid-connected hydropower stations

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