Integration of Distributed Generators in the Distribution System: Inverter Control in Microgrid
The microgrid comprises of the load and sources of few kW to few hundred of kW. The sources used are of different nature like variable frequency or variable voltage, and some sources are natural DC sources. Inverter is the best option to bring the source output at one frequency and at constant voltage. In case of more than one inverter in the system, power sharing by the inverter is according to power-frequency droop characteristics. The reference quantities required by the inverter are generated locally and therefore no need to have any communication between the inverters. Simulation of the inverter, which is controlled by flux control technique, has been presented. Real power-frequency droop and reactive power-voltage droop will be applied to these inverters. This will give the power sharing (without any communication between the inverter) according to the droop characteristics and rating of the inverter. Also the voltage can be controlled at nominal value. The concept of eigenvalues selection for the standalone inverter and for the two-inverter system has been presented.
The sources like Fuel Cell and Photovoltaic (PV) will be integrated in the microgrid. Before that the modeling of these sources is required. Also, microgrid will be simulated for the various loads.