Modular Static Distribution Controller for Distributed Energy Resource Generation Applications

Recently, renewable wind generations (WG) is enjoying a rapid growth globally amongst other renewable energy sources due to their lower cost and technology advancement. However, the intermittent nature of wind energy and performance of the attached induction generators inevitably poses some challenges to the power grid integrated large-scale wind-farms (WF), especially in case of weak power system. These challenges include frequency oscillations, voltage variation and power quality issues. To overcome these problems and facilitate the WF integration, this study proposes a modular static distribution controller (MSDC) at the WF point of interconnection (POI). The MSDC is composed of a dc-ac power converter connected to a dc/dc chopper converter and energy storage system. The overall power electronic system is considered as a versatile controller which is connected at the POI of WFs, and it can perform several tasks including frequency regulation, reactive power support, voltage control, harmonic filtering, power smoothing, and dynamic load balancing. The detailed model of the MSDC is presented and its control system is developed. In this paper, the dynamic performance of MSDC system is evaluated to achieve different objectives, and the operation of MSDC is validated in an actual weak power system under different modes of operation.