Lithium titanate battery energy storage power supply system for workover rig and control method thereof

Abstract

The invention discloses a lithium titanate battery energy storage and power supply system for a workover rig and a control method of the lithium titanate battery energy storage and power supply system for the workover rig. The power supply system comprises an AC / DC rectifier, an inverter unit, a DC / AC bidirectional direct current converter and a lithium titanate battery. The alternating current side of the AC / DC rectifier is connected with a power grid. The direct current side of the AC / DC rectifier is connected with the direct current side of the inverter unit and one direct current side of the DC / AC bidirectional direct current converter through a direct current bus. The alternating current side of the inverter unit is connected with a motor. The other direct current side of the DC / AC bidirectional direct current converter is connected with the lithium titanate battery. The control method comprises steps of controlling the charging and discharging states of the lithium titanate battery according to drill pipe pull-out work, hovering work and drill pipe run-in work of the workover rig. According to the system and the method, the high power motor can work in full load or even overload under a low volume transformer, the voltage of the power grid is stabilized, the interferences brought to the power grid due to frequency starting are reduced, the energy consumption of the device can be reduced, and the system and the method are convenient to migrate, popularize and apply to engineering devices such as hoisting devices.

Description

technical field [0001] The invention relates to the field of petroleum equipment, in particular to a lithium titanate battery energy storage power supply system for a workover rig and a control method thereof. Background technique [0002] Workover rig is a kind of oil and water well workover operation equipment widely used in oil fields, such as figure 1 shown. At present, my country's traditional workover rigs are powered by diesel engines, and there are three problems of high energy consumption, high noise, and high pollution in workover operations. In order to solve these problems, the grid workover rigs developed in China in recent years have shown strong advantages with low energy consumption, low noise and low pollution. However, the power supply of the grid workover rig is limited by the power supply conditions of the oilfield well site. [0003] The power supply conditions of the existing well site in the oil field are designed for the electricity demand of the p...

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Problems solved by technology

[0005] (1) The existing diesel workover rigs have low energy conversion efficiency, high oil consumption cost, and high noise and exhaust gas pollution;

[0006] (2) The electric workover rig is limited by the capacity of the transformer on the well site, the power of the motor equipped with it is small, and the working time is insufficient:

[0007] (3) The emerging grid power workover rig based on supercapacitors as energy storage devices has high cost, low energy density, uneven terminal voltage distribution, and poor reliability

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