Abstract
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.
Highlights
The main purpose of the “Smart Grid” can be defined as 'to enhance the power system infrastructure using communication technology, power electronic technologies and storage technologies and to operate in such a manner that production and consumption are balanced at all levels, i.e., from the highest voltage level to the domestic customer level' (Bollen et al, 2010; Isa et al, 2016)
Load leveling can be defined as the process where power is conserved in the battery during light load conditions so that it can be utilized during the periods of high demand
We have proposed a multimode controller with integrated fault detection mechanism and a standalone mode controller for the DSTATCOM-Battery Energy Storage System (BESS) system, so that when there is a grid failure, the load can be safely isolated from grid and supplied by the battery using the same inverter structure which was providing load leveling and DSTATCOM functions in gridconnected mode
Summary
The main purpose of the “Smart Grid” can be defined as 'to enhance the power system infrastructure using communication technology, power electronic technologies and storage technologies and to operate in such a manner that production and consumption are balanced at all levels, i.e., from the highest voltage level to the domestic customer level' (Bollen et al, 2010; Isa et al, 2016). In the Department of Energy report, the six main advantages of Smart Grid have been explained with regards to reliability, economics, efficiency, ecofriendly, security and safety (Hamilton et al, 2010) In this scenario, there are possible issues that arise both on the generation side and on the consumer side. Load leveling can be defined as the process where power is conserved in the battery during light load conditions so that it can be utilized during the periods of high demand. This allows for the postponement of increasing the generation capacity and grid upgrades (The ABB Group Brochure., 2012)
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