Abstract : Submersible electric pumps adopt full-pressure power frequency constant pressure operation and direct start, which has problems such as large impact, affecting pump life and oilfield output, and serious energy consumption. With the development of variable frequency speed regulation technology, frequency converters are applied to electric submersible pump systems. Frequency converters have advantages in energy saving, improving product quality and automation, but they also have negative effects on submersible electric pumps. Therefore, studying the variable frequency speed regulation problem of submersible electric pumps and optimizing the design of variable frequency speed regulation system has important practical significance. Keywords : Submersible electric pump, variable frequency speed regulation system, optimization design [b]1. Problems encountered 1.1 The effect of output du/dt on the electric pump[/b] Ordinary voltage source frequency converters have large output voltage jump amplitude and fast inverter power switching speed, so they will produce a large voltage change rate, that is, a large du/dt value. This will affect the insulation and bearing life of the electric pump. Due to the existence of distributed inductance and distributed capacitance of the line, traveling wave reflection will occur, which will amplify the du/dt value. (1) The principle of traveling wave reflection and its effect on insulation. Submersible electric motor power cables are special cables with good insulation performance, high strength, and the ability to withstand high temperatures. The voltage and current at a certain distance on the transmission line can be expressed as: U = U_sup + U_sup - I_sup; I = I_sup + I_sup - I_sup Where: U_sup + is the incident voltage wave, i.e., the forward traveling wave; U_sup - is the reflected voltage wave, i.e., the reverse traveling wave. The actual voltage and current existing in the transmission line are only the sum of the incident and reflected waves. It can be seen that as the cable length increases, du/dt will be amplified due to the reflection of the traveling wave. [b][align=center]For more details, please click: Submersible Electric Pump Variable Frequency Speed ​​Control System[/align][/b]