Impact of Inverter Interfaced DG Control Schemes on Distributed Network Protection

摘要

In this paper, Fault current from IIDG in distribution network has been examined. In fact, the impact of IIDG control modes voltage controlled/current controlled modes are thoroughly studied and investigated. In addition, the conventional PI controller working on conventional overcurrent protection schemes has been compared with the proposed PR controller. PR controller is a more effective tool to damp out grid uncertainties. Here the proposed controller is embedded in the inverter closed loop and inverter different modes are considered to analyze their effects on various types of fault. This paper deduced the following significant points: 1. Proposed controller limits inverter output current effectively on reduced terminal voltage in the case of both three phase symmetrical and L-G, 2L-G unsymmetrical faults. 2. A comparative study has been conducted between the conventional PI controller and PR controller and their effects on inverter output current, and the terminal voltage is examined on various types of faults. 3. Conventional PI controller is easy to install but its behavior is sluggish and works on conventional protection topology viz. overcurrent protection.