Harmonic Analysis Of Power System Of Electric Propulsive Shipping

Harmonic problems in the power system of electric power pulsive shipping are discussed in this articl.The first, electric apparatus relate to ship are sorted:Then effects caused by harmonic are analysised;To different circuittopologies, the causes of producing harmonic and the characteristics are analysised detailedly. For electric power pulsive shipping, the voltage is not always normal, especially when the main motor is starting, and three-phase bridge commutated circuit is used widely, so, a new method to compute harmonic is developed, which is more accurate and practical, is more adapt to the ship condictions. In harmonic measure aspect, all kinds of method used frequently now are anlysised and compared. A new measuring harmonic method based on the theory of instantaneous reactive power is developed, which resolve the contravention between the accuracy and the real time in measuring harmonic.