Autonomous WPP/HPP power system operating modes study

Abstract

Today, there are centralized and decentralized energy supply areas world-wide. Centralized energy supply is provided by united energy grids which cover most habitable areas; they incorporate several types of power sources with centralized control system. Decentralized energy supply areas cover territories disconnected from power grid, and they incorporate only one type of power source.Autonomous diesel power plants (DPP) are nowadays used mainly to power decentralized consumers and consumer groups. DPP basic disadvantages are power production high cost, diesel fuel nonregenerability, greenhouse gas emission and environmental pollution. The possibility of power supply by autonomous power systems combining wind power plants (WPP) and hydro power plants (HPP) as alternative to diesel generation due to hydraulic energy storage advantages has been considered.Autonomous WPP/HPP power system is a combination of WPP, HPP with water-storage reservoir, automatic control system and switchgear, combined by power, infrastructural and data connections. Hydrogen energy storage is considered to be the second energy storage.HPP water-storage reservoir parametrization procedure considering operating specificity of HPP and WPP as a part of power system with hydraulic and hydrogen energy storage has been suggested. Mathematical models for operating modes of WPP, HPP and storage reservoir have been developed, which consider resources, technical and technological features of their performance in decentralized power supply system. Technique for determining storage reservoir backup volume with allowance for wind conditions parameters, WPP features and storage reservoir configuration have been suggested. Method of day-ahead WPP power calculation in solving problem of operational planning of power system operating modes has been suggested. Simulation of WPP/HPP power system operating modes with seasonal-storage reservoir and hydrogen energy storage have been carried out.The suggested techniques could be used for solving design problems to substantiate decentralized power supply system parameters in remote and isolated areas, as well as for evaluating energy efficiency of replacing the existent decentralized power supply systems on the basis of DPP using imported diesel fuel by environmentally safe systems on the basis of local energy resource – wind energy and hydraulic energy. The suggested techniques are also focused on solving problem of power system operating modes for operational planning.