Summary
This paper presents a novel autonomous droop‐based power sharing scheme for parallel inverter‐connected photovoltaic (PV)–based islanded microgrids, in which both resistive and inductive distribution lines are taken into account. The proposed control strategy contains a compensating approach with a view to adding a power offset to the real power owing to the fact of balancing the inverter output power during the variation in the output of solar energy. A derivative term is also included in the designed controller, which damps the oscillatory modes of the controller so that better dynamic performance is ensured. Proportional power sharing among inverter‐interfaced PV generators is maintained by including a novel voltage control law in the control algorithm, in which the reference values of the voltage sources are kept the same. The stable range of droop‐based control parameters are determined by the extended dynamic phasors model analysis. Finally, the performance of the designed controller is verified on a PV‐based islanded test microgrid, and superior dynamic performance is obtained compared with the generalized droop‐based controller.
In this paper a platform is developed to facilitate the control of household loads using communication protocols relevant to home automation and substation automation systems. Protection IEDs that support IEC 61850 standard based protocol, universal secondary test gear for relays and a protocol converter are used to realize the protection/automation aspects for substation automation. The retrofitting of the latest relay IEDs with the existing control center software has also been demonstrated. In the home automation space, the available commercial Programmable Logic Controller (PLC) and IEDs are used to develop the platform. The automation load control scheme is programmed based on IEC 61131 standards using structural language and is implemented through EtherCAT protocol. The PLC uses the IEC 61850 server to communicate and gather raw data form the power measurement terminal. The developed platform establishes different aspects of automation and standard based communication system identified the Smart Grid framework. This prototype integrates two different vendors' intelligent electronic devices and implements a smart load shedding algorithm which controls load in real time.
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