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This paper presents studies on improving the robustness of shipboard dc hybrid power systems. The shipboard power system can be regarded as an islanded microgrid. The objective, in particular, is to reduce the load curtailment when generator failures take place in the islanded microgrid. By applying the basic unit commitment (UC) operation model, the loads can be fully supplied during normal condition...
Natural gas powered inverter-based distributed energy resources (DERs) are becoming increasingly popular. In such DERs, the output frequency is decoupled from the prime-mover speed. This is advantageous in terms of improved efficiency and reduced emissions for the internal combustion engine. However, under large load conditions the prime-mover can stall leading to a voltage collapse. This paper presents...
In this paper, an economic evaluation is carried out for energy storage options in an industrial microgrid comprising four distributed energy resources (DERs). It is assumed that each DER unit is accompanied by Li-ion battery and/or supercapacitor for load following under islanded mode of operation. Cost estimates are made for different energy storage options based on present value of life cycle cost...
This paper evaluates the energy storage systems (ESS) in the microgrids. The ESS unit is regarded as an added energy resource in microgrid system to support the power balance when regular distributed energy resources (DERs) are incapable of matching the load demand. Sizing and specifications of ESS are investigated in this paper using several test case scenarios. An overall evaluation of the energy...
Natural gas powered distributed energy resources (DERs) are gaining more popularity due to the recent discoveries of huge natural gas reserves in several places. These DERs however suffer from the tendency to stall under large load fluctuations owing to the fuel map limits present in the engine governors and the inherent time lag in torque production. A critical analysis of the stalling causes is...
Natural gas based distributed energy resources (DERs) are likely to be favored by electric utilities in the near future because of the newly found shale deposit resources. Reciprocating engine based generator sets are a leading class of energy conversion equipment from the low kW upto 100s of kW ratings. Standalone engine generator sets with isochronous governors are susceptible to stalling when they...
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