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This paper extensively analyzes the operation limits, system stability and disturbance rejection capability of the voltage control loops used in master-slave AC and DC Microgrids (MGs). Two different control schemes are studied analytically, simulated and experimentally tested, focusing on Constant Power Loads (CPL). Additionally, the use of the virtual capacitance (VC) as a tool for response enhancement...
This paper focuses on improving the dynamic behaviour of a microgrid (MG) supplied by a self-excited induction generator (SEIG) when feeding mainly induction motors (IMs) of significant power. In order to sustain the MG during the transitory regime induced by the IMs connection, a short-term energy storage system based on a supercapacitor (SC) is added to the MG control system. Also, a stepped capacitor...
A nonlinear discrete-time model along with an optimal stabilizing controller using a unified power quality conditioner (UPQC) is proposed for weak/islanded grids in this paper. An advanced stabilizing controller greatly benefits islanded medium-sized grid and microgrid due to their relatively small stored energy levels, which adversely affect their stability, as opposed to larger grids. In addition,...
The grid-interconnected Microgrid must be able to operate without the utility's grid to supply electricity in case of outage. To operate in standalone mode, the Microgrid must control electricity demand or supply to maintain the frequency. The Microgrid EMS (Energy Management System) could control supply and demand with the AGC (Auto Generation Control) function using a communication line. Note, however,...
In the micro-grid, the grid-connected inverter and its filter are important to convert and transmit the energy. In this paper, a T filter is used to reduce the harmonics of the grid-current. However, it will be lack of enough stability. In order to overcome this obstacle, a new passivity based controller, namely IDA-PBC is proposed in this paper. And the paper analyses the stability of the controller...
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