With the gradual consumption of energy in the world, the exploitation of deep-sea oil and gas fields has gained significant importance as a research topic. At present, the deep-sea underwater production technology has started to develop and put to practice, and the underwater power supply has always been an important factor that restricts the innovation of Chinese underwater production technology. It is very important to carry out the long-distance conversion drive experimental platform analysis simulation and construction. This paper leverages the experimental platform to carry out system resonance analysis, motor start-up and other research, and verifies the test ability of the long-distance frequency conversion drive experimental platform. It shows that the system can effectively simulate the operation state of the actual engineering, and provide further technical support for the research of underwater power supply system.