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Mashhad Electric Energy Distribution Company (MEEDC) has designed and implemented the first local micro-grid in Mashhad which is called “MehrSun”. This article presents the performance analysis and result assessment of Mehrsun after working for one year. Different micro-grid elements and the connections with local power network are explained and the level of home automation which is implemented for...
The output voltage characteristics of a thermoelectric generator were analyzed to suppress heat leakage for low-temperature waste-heat thermoelectric generation. The experimental results show that the pre-cooled thermoelectric device output a higher voltage than the reference device. The experimental results also show that the influence of heat leakage took a longer time to appear using the pre-cooled...
In this paper, power losses of 3-level NPC inverter (3LNPCI) and 3-level T-type inverter (3LTI) are classified and calculated according to the switching states. The conduction loss depends on modulation index (MI) and power factor (PF), whereas the switching loss depends on switching frequency, so the power loss analyses have been done at the different operating points of MI, PF, and switching frequency...
This paper proposes a new design and implementation of a single stage three-phase multi-level inverter (MLI). The suggested inverter is modular type and can be generalized by connecting the basic modular cells in series configuration. In addition, it can be operated with symmetrical/asymmetrical Dc-voltage sources. The proposed MLI is successfully modulated using sinusoidal pulse width modulation...
This paper proposes a real time symmetrical coordinate transformation applied for the fault-ride-through when the imbalanced fault occurs in the utility power system. The power conditioner of the photovoltaic system in Japan is required to remain connected when the utility power system fault occurs under certain condition. The most popular fault is 1 line-to-ground fault. The next is 2 line-short-circuit...
To take advantage of volatile renewable energy, implementation of digital control is effective since it supports the application of various advanced control theory and communication functions. However, it is usually difficult to use the actual plant to be controlled at the control software development stage, particularly in terms of cost and safety. Therefore, during the control software development...
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