Unit sizing and control of hybrid wind-solar power systems

TLDR

Hybrid wind‑solar systems can reduce environmental impact compared to diesel, but grid‑linked deployments must also minimize emissions to justify renewable use. The paper presents a CAD/CAA tool to optimally design hybrid wind‑solar power systems for autonomous or grid‑linked use. The tool uses linear programming to minimize average electricity cost under load constraints, incorporates environmental factors, and employs a controller that monitors energy flows, environmental credit, and operational losses.

Abstract

The aim of this paper is to provide the core of a CAD/CAA tool that can help designers determine the optimal design of a hybrid wind-solar power system for either autonomous or grid-linked applications. The proposed analysis employs linear programming techniques to minimize the average production cost of electricity while meeting the load requirements in a reliable manner, and takes environmental factors into consideration both in the design and operation phases. While in autonomous systems, the environmental credit gained as compared to diesel alternatives can be obtained through direct optimization, in grid-linked systems emission is another variable to be minimized such that the use of renewable energy can be justified. A controller that monitors the operation of the autonomous/grid-linked systems is designed. Such a controller determines the energy available from each of the system components and the environmental credit of the system. It then gives details related to cost, unmet and spilled energies, and battery charge and discharge losses.