Microgrid Performance with Integrated Renewables Supported by Energy Storage Systems

Abstract

Renewables sources are now used in the production of electricity. One of these sources is wind energy. Wind energy is detected as the most economic and a clean source because it does not produce any pollution to the environment. However, wind is inherently an intermittent source for the production of power which may affect the power quality of the power system. For wind power output variations, the grid has to be able to provide sufficient power to loads which lead to insertion of energy storage system with the wind turbine.

An energy storage system for the wind turbine is needed to be able to provide an approximately constant power and voltage. Energy storage systems are able to support the combination for the wind turbine to be inserted into the grid. They may also help any other renewable source to be applied.

In this work, the main objective is to provide an energy storage system which is suited to mitigate disturbances happened in the system such as wind variability, sudden load change and faults which may be happened in the system. The energy storage technique used here is a Distribution Static Synchronous Compensator (DSTATCOM) electrically combined to an advanced energy storage device known as a Flywheel Energy Storage System (FESS). A simulation model of the DSTATCOM/FESS scheme is briefly developed and a control technique with several levels is introduced. This proposed control technique has one control mode for the real power, and a couple of control modes of which we can choose anyone of them, may be applied for reactive power and voltage control. This suggested technique has been used here to enhance not only the steady state operation, but also to mitigate sudden load changes. The control system under consideration, with the DSTATCOM/FESS, and its controls are analyzed also, under