Recycling conventional control strategy and hierarchy for future DG control

Abstract

The penetration of distributed generation is increasing to assist main power plants worldwide. An efficient strategy of grid control integration, to interconnect the DG systems to conventional power systems, is required to improve the power quality and reliability (PQR). The main task of the interconnected system is to control and maintain frequency and voltage of the power system in an acceptable range. This task has been currently operated using synchronous generators in many interconnected power systems. The power dispatch, frequency control and voltage control, power exchange and power optimization are managed in conventional power supply systems. Therefore, the control strategy of the conventional power systems can be adapted to DG technologies through their interface unit to the grid, namely the inverter. The inverter is the primary interface unit between the energy source and the grid. This paper proposes an adaptable and flexible control strategy for future DG systems in interconnected grids based on inverters as front-end. The proposed control strategy can be a basic strategy to implement the DG system into existing conventional power systems.