無効電力補償装置用改良形二重接続電圧形インバータ

概要

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In this paper, we proposed a new method for reducing harmonics involved in output voltages of double connected voltage source inverter. By adding four auxiliary switching elements and an interphase transformer with secondary winding to the usual 12-step inverter, the proposed inverter can decrease the harmonics in output voltages no less than the conventional 36-step inverter. The basic theories for this circuit are discussed by analysing the output voltage waveforms, and the optimum parameters are derived.In addition, this paper presents a static var compensator (SVC) system which employs the proposed inverter. The distortion factor of reactive currents and the capacities of system components for the proposed SVC are compared with those for conventional 12-step inverter. As a result, a capacity of interphase transformer is only 5% for the rating. Therefore, total capacities of this SVC system can be reduced, including output transformers and AC filters, by about 40% compared with the conventional one.
社団法人電気学会の論文