In recent days, the ORPD topic has attained significant consideration, since it enhances the economy and security of a power system. It includes discrete and continuous controlling parameters and thus it is considered as a complicated nonlinear issue. Thereby, this paper focuses on foremost objectives such as, diminution of loss and variations in voltage, which assists in resolving the ORPD problem under unbalanced states. For attaining these objectives, "Whale Optimization Algorithm based Parameter Optimization (WOAPO) approach" is exploited. This algorithm makes an impact on the controlling constraints that are adjusted to accomplish the optimal outcome. Finally, the superiority of the presented work is proved other other existing schemes. On observing the outcomes, the values attained under best case scenario using WOAPO scheme is 0.57%, 0.5% and 0.92% better than GA, FF and ABC. In addition, the worst case scenario of WOAPO approach is 1.16% superior to PSO model.