DC LINK SENORLESS POWER CONTROL STRATEGY IN MICROGRID

Abstract

The dependency of the energy market on renewable energy sources has grown rapidly over the past few years, especially photovoltaic systems. Also, microgrid is an area of interest as it can be used as an effective complementary of power grid. But microgrids face protection, reliability, and stability issues, so control should be prudent. Voltage-oriented control (VOC) and direct power control are the common methods for active and reactive power management of grid-connected PV systems. The main aim of this project is to develop a DC link sensor less control strategy for the microgrid. The first DC-DC converter stage of the system incorporates adaptive 'perturb and observe' maximum power point tracking. In the second stage, the DC link sensor less control is used to control the inverter. The proposed system uses a system loss model to generate the control signal. In this project, for a typical microgrid-connected PV system, the proposed model is designed and simulated in MATLAB SIMULINK. And the performance of the system is analysed and compared with the conventional VOC system. As an outcome, eliminating the DC-link high voltage sensor enhances the transient response and system stability under loading and reduces system size and cost