Abstract:
Distribution systems that make use of power electronic converters are progressively connecting renewable energy resources (RES) to one another. In this study, a unique control method is presented for the purpose of gaining optimum benefits from grid-interfacing inverters when they are deployed in distribution systems that are composed of three phases and four wires.
Active power filter functionality is incorporated into the inverter, which allows it to be controlled to behave as a device that can do multiple functions. Since this is the case, the inverter can serve two purposes: first, as a power converter to inject electricity generated from renewable energy sources into the grid; second, as a shunt active power filter to compensate for current unbalance, load current harmonics, load reactive power demand, and load neutral current.
Independently or simultaneously, each of these functions can be carried out independently or concurrently. When a control of this kind is applied, the combination of a grid-interfacing inverter and a three-phase, four-wire linear/non-linear unbalanced load at the point of common coupling gives the impression of being a balanced linear load to the grid.
In order to demonstrate this new control idea, thorough simulation studies were conducted using MATLAB/Simulink. Additionally, the concept was validated through laboratory testing results based on digital signal processors.
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