Distributed Newton Method for Primary Voltage Control in Islanded DC Microgrid

In an islanded DC microgrid, power balance is realized through maintaining bus voltage stability. Traditional droop control may encounter significant technical challenges, as it is sensitive to measurement errors, and optimal load sharing cannot be achieved. This paper presents a distributed primary voltage control method without central coordination, which is based on a distributed Newton algorithm and peer-to-peer communication over a sparse network. In control process, the method also minimizes total generation cost and maximizes utilization of renewable energy. The simulation results indicate the method has much better dynamic performance than conventional droop control scheme and those first order algorithms. Besides, the method shows the advantage of insensitivity to measurement errors and time delay.