Abstract : After introducing the various drawbacks of traditional power supply methods for submersible electric pumps (SAPs), this paper elaborates on the advantages of variable frequency power supply. Furthermore, it presents several special requirements and solutions for 2300V SSP inverters. Keywords : Variable frequency drive; Submersible electric pump; Low-pass filter; Compensation voltage 1. Drawbacks of Traditional Power Supply Methods for SSPs Upgrading existing oilfield production equipment with modern high technology is an inevitable trend. Using modern automatic control technology and variable frequency speed regulation technology to provide an ideal power supply for oilfield SSPs (hereinafter referred to as SSPs) is an important part of this technological transformation process. SSPs typically operate at voltage levels of 1140V and 2300V. They are installed 1000m-3000m below ground level. The working environment is extremely harsh (high temperature, strong corrosion, etc.), and traditional power supply methods—full voltage, power frequency—lead to frequent failures and significantly increased operating costs. When a SSP is damaged, it needs to be brought to the surface for repair. The engineering cost alone reaches 50,000 yuan. Cables worth 100,000 yuan need to be replaced on average after being pulled up and down five times. Submersible pumps need to be repaired every 10 months on average. The repair cost is about 80,000 yuan. Traditional power supply methods have many disadvantages, such as: (1) When the submersible pump is running at full speed, it is easy to pump out when the downhole fluid volume is not sufficient, and even cause dead wells. Once a dead well is formed, the losses will be heavy. (2) The starting current and impact torque of full-pressure and power frequency operation are large, which not only wastes electricity, but also has a great impact on the life of the motor. (3) The power supply voltage of the oil field often fluctuates, causing the motor to be under-excited or over-excited. The motor is often burned out. (4) The downhole cable of several kilometers brings about 150V of line loss. Since this part of the loss cannot be compensated, it affects the normal operation of the motor. As can be seen from the above, the traditional power supply method of submersible pumps must be transformed. A more ideal power supply equipment should have the following characteristics: soft start; convenient speed adjustment, i.e. frequency conversion operation; the starting time and running speed can be set arbitrarily according to the working conditions; it is not affected by the fluctuation of the power supply voltage and can compensate for the line loss of the cable; the transmission on the cable must be a sine wave, otherwise it will be reflected by the cable. Superimposed voltage pulses can easily burn out the motor; comprehensive protection functions are essential; control is convenient, operation is simple, and the display is clear. Obviously, nothing meets these requirements better than a frequency converter. However, the frequency converters readily available on the market designed for fans and pumps are unsuitable because of incompatible voltage levels, non-sinusoidal output waveforms, and inability to compensate for cable losses. [b][align=center]For details, please click: 2300V Submersible Oil Pump Dedicated Frequency Converter[/align][/b]