A discrete gradient stepwise optimization algorithm for medium and long-term reservoir dispatching with HVDC constraints

Abstract

The invention relates to the operation field of hydropower dispatching, and relates to a discrete gradient step-by-step optimization algorithm for long-term dispatching of a reservoir group considering HVDC transmission constraints, which is a novel optimization algorithm for solving the dimension disaster problem in reservoir dispatching. On the basis of the traditional gradient and its corresponding gradient descent method, the invention proposes a calculation method of discrete gradient and a corresponding discrete gradient descent method, and combines the method with the POA two-stage sub-optimization problem to propose a discrete gradient step-by-step optimization algorithm DGPOA. This method can determine the optimal search direction in a given discrete step size by using the information of discrete gradient without directly deriving, and can be solved iteratively by using the iterative equation of line search, which can significantly reduce the computational scale and obtain theoptimization results quickly. This rule has important guiding significance for cascade reservoir group power generation dispatching.

Description

technical field [0001] The invention relates to the field of hydropower dispatching operation, relates to a discrete gradient stepwise optimization algorithm for medium- and long-term dispatching of reservoir groups considering the constraints of direct current transmission, and is a new optimization algorithm for solving the dimension disaster problem in reservoir dispatching. Background technique [0002] By the end of 2016, my country's hydropower installed capacity and annual power generation had exceeded 300 million kW and 1 trillion kWh, accounting for 20.9% and 19.4% of the total energy respectively. Hydropower has become the largest renewable energy in China. Making full use of hydropower resources and optimal dispatching of reservoir groups is an important measure to build a clean, low-carbon, safe and efficient modern energy system. The optimal dispatching of cascade hydropower station groups operating in modern AC / DC large power grids is a typical high-dimensional...

AI Technical Summary

Problems solved by technology

When solving two-stage sub-problems, POA uses a grid search method with a given discrete step length to ensure global convergence in solving sub-problems, but with the increase in scale, there is still a serious "curse of dimensionality" problem

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