Research And Design For Parallel Inverter Modules Of Shaft Generator

Shaft generator have a lots of advantages, such as more economical sufficient, less fuel consumption, cheaper fuel cost, reduced noises in cabin , spacing saving and so on. Therefore it has been used much wider and often. Recently most of those newly produced ships had installed shaft generator system, such as cargoship, bulk boat especially the Ship of Propeller by dual-shafting. In order to install two shaft generators systems on propeller by dual-shafting, one important aspect is parallel control of two shaft generators.During the parallel connection in the system of two shaft generators, the main point is the parallel connection between the inverter modules which has to adopt the technique called parallel of inverter.Based on parallel of inverter technique, firstly dual-loop instantaneous control is selected as the control strategy of a single inverter, which has the advantages of good sinusoidal output waveform, fast dynamic response, excellent load characteristic and high precision of output voltage. This paper also concentrated on the study of parallel control strategy based on real and reactive power, which can reduce the circulatory current obviously. In order to improve the stability of the system, this thesis suggested fuzzy control to amend the parallel control strategy based on real and reactive power. The amended parallel control strategy is presented and verified by MATLAB's simulation results.By adding fuzzy control in to the system, feasibility and dynamic function were obviously increased. As the result the whole system become more effective, sufficient and has good control outcomes.