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A microgrid is a controllable component of the smart grid defined as a part of distribution network capable of supplying its own local load even in the case of disconnection from the upstream network. Microgrids incorporate large amount of renewable and non-renewable distributed generation (DG) that are connected to the system either directly or by power electronics (PE) interface. The diversity of...
This paper proposes a novel strategy of control of the active power flow from the power system grid to a micro grid by a power electronic transformer (PET), consisting of controllable loads and distributed energy resources (DER), both renewable and non-renewable. A 60 Hz, step down transformer is generally used at the Point of common coupling (PCC) of a micro grid to connect to the power system grid...
Distributed generation in islanded power systems has unique characteristics when it comes to power system stability and control. Relatively low system inertia and the power system configuration of intertie connections between distributed generation facilities necessitate the implementation of power management control algorithms that provide both proactive and reactive stabilization techniques to ensure...
This paper proposes a new method to determine the droop of the inverter-based distribution generations (DGs). Conventionally, inverter-based DGs have droop controller with fixed slope according to their capacity. Some additional control methods have been proposed in order to enforce the maximum or minimum limit of a unit. However, in some severe cases, the frequency deviation during the islanded mode...
This paper presents a discussion on the control techniques required for microgrid operation and implements a simple control strategy in a microgrid model realized with Matlab. The modeling and control strategy are kept elementary. This is done in order to use developed model for teaching and student training purpose for power system curriculum in undergraduate courses. The model is helpful in introducing...
This paper develops a voltage/frequency regulation scheme for an islanded distributed energy resource (DER) unit. The DER can be either a distributed storage (DS) unit or a dispatchable distributed generation (DG) unit. The DER unit is represented by a (time-varying) DC voltage source that is electronically interfaced to an aggregate of loads. The electronic interface consists of a voltage-sourced...
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