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The rapid development of modern vessel leads to higher demands on the optimization and integration of shipboard power supply system (SPSS). In this article, a compact-design oriented 12-pulse parallel operating transformer employing shared integrated filter is presented for power quality improvement of SPSS with reduced installation space. The proposed SPSS is featured with harmonic-free power supply and high integration of power equipment. The system topology is introduced first, and the distinctive compensation principle is then analyzed. Taking into account both of the winding impedance matching and transformer size optimization, minimum radial dimension is searched and determined in the interval of approximative zero-impedance. Moreover, the inductance calculation method of integrated reactor together with its design domain is further given out. At last, the prototype of the proposed SPSS is tested in laboratory. The experimental results verify the feasibility and effectiveness of the proposal. [ABSTRACT FROM AUTHOR]