Schedule Optimization Of Wind Hydro And Thermal Based On Large-scale System Decomposition Coordination Theory

Large-scale theory is a theory specialized for solving large-scale system problems, the core idea is by using such methods as simplifying the model, reduction, decomposition and coordination of distributed control or other methods, to split large scale system into small systems, in order to avoid solving large system directly, thus avoiding the "curse of dimensionality" occurs. Hydrothermal wind scheduling system is a typical large-scale system, it consists of three kinds of power station which is related to each other. Typically, we consider the minimum of the coal consumption as our target function, and at the same time we must take the constraints of the thermal station, hydropower station and wind power station into account. Therefore, this is a typical high-dimensional, non-convex, more complex constraint programming problem. This paper starts from large-scale theory, aims at solving the hydrothermal wind scheduling problem, we propose a two level common large-scale coordinate model:the upper level is coordination level which is in charge of updating and sending coordination variables; the under level is the wind, hydropower, thermal power station sub-problem. In this way we decompose the hydrothermal wind scheduling "large’ problem into’small" single wind problem, hydropower problem and thermal power problem. In the under level, thermal power sub-problem is solved by dynamic programming method. For different hydropower station model, cascade hydropower sub-problem is solved by large system decomposition coordination algorithm; hydropower alone sub-problem is solved by heuristic algorithm. Wind farm sub-problem is solved by building wind power prediction output model. In the upper coordination level, we use BFGS method to update coordinate variables, this can not only ensure the convergence accuracy of the algorithm but also ensure the convergence rate of the algorithm. Through the real simulation of two kinds of hydrothermal wind scheduling problem model, we test and verify the feasibility and versatility of using large-scale coordination model to solve the hydrothermal wind scheduling problem...