Interaction between hysteresis controlled inverters used in distributed generation systems

Many new primary energy sources in distributed generation systems are interfaced with the electric grid through power electronic inverters. If several of these are present in proximity of each other, interactions between them could arise. This paper presents a study of the interaction between hysteresis controlled voltage source inverters connected to the same power network. The coupling between the inverters results in an interdependence of their switchings. It is shown that this interdependence is not detrimental, and a reduction of the ripple in the resulting current supplied to the network as compared to the single inverter case is obtained. The effects of various parameters of the inverters are analyzed.

I. Introduction

In the last few years, the use of renewable energy sources has become popular in many parts of the world. Renewable sources of energy can be divided into two groups: 1) small scale renewable sources which are connected to the power distribution network (located close to the customers) and 2) large-scale renewable sources which are located far away from the customers where renewable energy is available in large quantities.