Hysteresis controller based on a circular error area table applied to a variable speed renewable energy system.

Abstract

Nowadays the proliferation of renewable energies has the problem of the limited capacity of the grid to absorb these types of energies due to their low quality. In order to increase their penetration in the electrical system it is mandatory to improve the control of the power stages used to inject the generated power and, in many cases, to achieve variable speed operation. The paper proposes a new current control method based on a switching table that keeps the current error in a circular area and compares it with other table hysteresis control [1],[2]. As it is shown, both the THD and the frequency is better in the proposed method.