Abstract
Due to the development of inverter technology, distributed generations, chargers of electric vehicles and storage battery systems to which inverter technology is applied in addition to rectifiers conventionally used are being introduced for customers' equipment. These instruments may affect the impedance characteristics of harmonics. Therefore, it is necessary to examine how to evaluate the influence of the characteristics of the equipment applying the inverter technology on the formation of harmonics in the harmonic calculation is there. This paper proposes a method to extend the node admittance matrix Y used in the calculation of harmonics so that the calculation of the power system circuit and the transfer function can be performed collectively. In this extension, the inverter's grid-tie transformer and the LC filter are taken into the Y matrix as a circuit. On the other hand, the inverter's switching circuit and control system are treated as transfer functions G(s).
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