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Economic studies in power systems have gained more importance post deregulation. The number of generators participating in the power market have significantly increased over the past years. Smart grids are now enabling distributed generation resources to also participate in the power market. Many economic studies conducted on power system networks utilize legacy quadratic cost curves which are based...
The dynamic frequency stability issues in microgrids with large penetration of low inertia and intermittent photovoltaic (PV) systems can be improved by using virtual inertia (VI). A VI is the combination of energy storage system, power electronics converter and a proper control algorithm. This paper presents design and experimental verification of the VI in a PV-diesel generator based remote microgrid...
This paper presents the modeling and control of wind system using the permanent magnet synchronous generator (PMSG) connected with the grid via a three phase converter AC/DC/AC through LCL filter. The objectives of the control are: (i)forcing the generator speed to track a varying reference signal, (ii)assuring a satisfactory power correction (PFC) respecting to the power supply grid, (iii) regulating...
For a safe and efficient operation of large variable-pitch wind turbines, the controller plays a vital role. Below the rated wind speed, there is a power-optimal rotor speed for a given wind speed, achieved by designing a generator torque control. Pitch control is appropriate above the rated wind speed, to keep the rotor speed constant. In order to deal with nonlinearities and uncertainties, in this...
Many rural communities are not able to access the main power grid supply due to high cost associated with grid extension. The stand-alone renewable energy based hybrid power system is a significant adaptation to cope with increasing power demand along with environmental consideration in rural communities. In such a system, determining the correct size and capacity of renewable generating units to...
Energy harvesting has become an alternative form of power generation over the last few years. The mechanical force induced by wind, water, vibrations using piezoelectric materials, and even the waves of the sea, are examples of energy harvesting methods. However, electromagnetic induction is an especially promising means of harvesting energy, as it is cheap, only coils and magnets being needed for...
The work presented in this paper describes an improvement of a P-V optimal slope MPPT technique. To achieve this improvement, all the degrees of freedom of the inverter control are exploited. Two forms are then established. Modeling and design of a PV power plant using these improved forms are performed. The results are validated by simulation in the Matlab-Simulink environment.
Air scroll expanders are increasingly used in energy recovery systems, such as Organic Rankine Cycles (ORC) and compressed air exhaust recovery, and in small scale Compressed Air Energy Storage (CAES) systems. Most of these systems use waste high pressure fluid to drive the expander, which in turn provides mechanical energy directly, or drives a generator. The purpose of this work is to investigate...
In this paper, a new multilevel inverter topology which can be operated in both symmetrical and asymmetrical configurations has been proposed. In order to produce all steps of voltage at output, four different algorithms are proposed to find the value of DC sources. The proposed topology reduce switch count, gate driver circuits, total voltage blocking capability and isolated DC voltage sources which...
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