Abstract
One of the solutions to reduce fuel consumption of diesel generators (DG) is to adapt the rotational speed to mechanical torque of the crankshaft. When load power decreases, a reduction in both mechanical torque and rotational speed of the diesel engine will maintain the combustion efficiency near the levels of the nominal regime. Accordingly, the generator itself should operate at a variable speed which normally requires power electronics converters. In this paper, we are exploring a new generator concept that uses a stator rotating in opposite direction to the rotor such as the relative velocity between the two components remains constant when diesel engine slows down. The stator itself is driven by a compensator synchronous motor (CM) such as the relative velocity of the rotor is constant, eliminating as such sophisticated power electronics. The model developed for the synchronous machine with a rotating stator is based on Park’s transformation. This new concept was modelled using MATLAB software. Experimental analysis has been conducted using a 500-kW diesel GENSET equipped with a permanent magnet synchronous generator (PMSG). The numerical and experimental results are in good agreement and demonstrate that fuel consumption is reduced with a rotating-mode stator for PMSG during low electrical loads.
Highlights
The numerical and experimental results are in good agreement and demonstrate that fuel consumption is reduced with a rotating-mode stator for permanent magnet synchronous generator (PMSG) during low electrical loads
We explore a new solution to operate the diesel generator at variable speed using a synchronous generator with a rotating stator [18] [19] [20]
The generator has connected to the 196-kW load power and the results are released in Figure 9 and Figure 10
Summary
In Canada, there are numerous remote areas with limited accessibility especially during winter months, where diesel engines (DE) are used to meet electricity demand such as telecommunication stations, mines and villages. In these sites, diesel engines are working non-stop even during low-load demand which results in important greenhouse gases (GHG) emissions and other negative consequences. Fuel governor is a mechanical device that adjusts the fuel injection to maintain the nominal speed when load power and associated torque vary This controller accuracy is limited, and the adaptation of DE speed is relatively slow during electrical load oscillations [9]. At low regimes, poor fuel efficiency and high maintenance cost affect significantly DG operation [10] [11] [12]. One solution to improve operation efficiency of the DE is to adapt its rotational speed to the load power (torque of the generator) such as to operate at maximum efficiency at all regimes [7]
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