Simulation and analysis of modified droop control using virtual impedance to improve stability and transient response

Power electronic interfaced distributed generation sources are gaining importance due to numerous advantages such as reliability and efficiency. This paper proposes a novel control strategy based on virtual impedance design criteria and modification in conventional droop control to improve transient response, stability and power sharing for parallel operated inverters interfaced with Distributed generation sources. The control technique does not require any communication and automatically compensates for parameter variations in network. Mathematical analysis and simulation results are presented in the paper to prove the concept behind the control strategies.