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In this paper we consider various structures of the power supply controllers for remotely operated unmanned underwater vehicles (ROV) with high voltage direct current (HVDC) transmission by strength-power communications (SPC) cable. The application of a power supply for ROV with HVDC transmission improves the weight-size parameters of the underwater part. The task of the highly efficient power supply design for ROV with HVDC transmission is set. We propose to divide the problem into two parts. First, we present the electrical circuit of the power supply. Second, we develop the control system of the voltage source inverter (VSI). The transfer function of the control object is calculated. Various controllers in the control system are analyzed. The developed power supply improves the technical performance of the underwater part, due to elimination of reactive current in the cable and the exclusion of converter unit in the underwater part. The control system uses output voltage and current signals of the onboard part to generate the control signals of the VSI. For carrying out experimental researches of the proposed controllers, we create the simulation model of power supply with HVDC transmission via SPC cable. The results of the simulation show that the tuning on the modal optimum is a more flexible procedure in comparison with the tuning on the technical optimum. Flexible tuning is performed due to the choice of the characteristic polynomial. Although, the structure of the modal controller is quite complex. We improved the PI controller performance, tuned on the technical optimum, by using of anti-saturation structures. That results in a decrease or absence of overshooting and the occurrence of static errors.