Speaker: Mr. Srikanth Kotra (EE13D212)
The decreased cost of solar and wind technologies along with the social and policy reforms has led to the increased demand for introducing photovoltaic (PV) and wind energy sources in power markets. The local generation and consumption of energy, which is referred as ‘microgrid’, is proved to be economical, reliable and efficient. In spite of the microgrid advantages, its grid interconnection has become a concern due to the intermittent nature of renewable sources. To smoothen the output power of renewable sources, battery and supercapacitor (Scap) based hybrid energy storage systems (HESS) are introduced in microgrids. Various control schemes are employed in microgrids to address the disturbances introduced by sources, loads and to regulate the DC and the AC grid voltages at reference values.
Identifying the power availability and generating appropriate reference quantities to various converters are important aspects of a microgrid control scheme. In the proposed control scheme, the system operating mode is identified by using the output of the controller which regulates the DC link voltage. It operates the microgrid without measuring the load currents/powers which eliminates the load current sensors and reduces the cost. The proposed scheme achieves better DC link voltage regulation compared to the conventional mode identification techniques. To evaluate the proposed mode identification technique, a control scheme is outlined and demonstrated on a DC microgrid during various operating conditions, such as generation and load variations, islanding, grid connection, generation curtailment, and load shedding. The proposed control scheme is validated with simulation studies and tested on an experimental setup.
All are cordially invited.