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A Distribution Static Compensator (DSTATCOM) can provide reactive power support, power factor correction and voltage regulation to a distribution system feeder. In this paper, a multimode multifunctional control algorithm is proposed for the controller of the Voltage Source Converter (VSC) to provide DSTATCOM and load leveling functionalities for smart grid applications through a Battery Energy Storage System (BESS) connected to the grid through the VSC. The designed controller enables the VSC to function in both grid-connected and standalone modes of operation. In grid-connected mode, the VSC provides load leveling, dynamic reactive power exchange and unity power factor functionalities based on consumer's choice. When a fault occurs on the grid, the controller opens the circuit breaker and isolates the load from the grid and then switches to the voltage controller for the standalone mode of operation. The novelty of the proposed controller is, the inverter structure which provides load leveling and DSTATCOM functionalities during grid-connected mode will also serve the load during a grid failure, thereby providing uninterrupted power supply to the load. The simulation results show the ability of the proposed multimode controller to successfully operate the multifunctional DSTATCOM-BESS system in various modes.

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Smart grid technology has enabled the bidirectional power exchange between utility and consumers, owning renewable power sources. The major challenge to this feature is the intermittent nature of renewable sources such as photovoltaic (PV), which makes it difficult to exchange a definite amount of power with the grid. This study aims to address this challenge, by proposing a multifunctional PV-battery system to provide intermittency smoothening along with reactive power and harmonics compensation in grid-connected mode and an uninterrupted power supply mode to loads during the grid outage. The PV-battery system comprises of a boost converter, bidirectional DC-DC converter and a grid-connected voltage-source converter (VSC). The boost converter operates the PV array at the maximum power point. The bidirectional converter provides the battery charging and maintains constant DC-link voltage. The VSC uses a multimode controller, which has a current controller for grid-connected mode, voltage controller for standalone mode, a voltage and rate of change of power-based islanding detection and resynchronisation as per the IEEE 1547-2018 revised standard, for mode transitions based on grid availability. Simulated and test results validate the effectiveness of the proposed control in achieving the set objectives.