Solution Advantages

The ES500 frequency converter integrates dedicated pumping unit control logic for intuitive HMI operation. It realizes automatic reciprocating and intermittent pumping. Built-in PID and precise position control ensure stable and smooth operation. For tower-type pumping units, it detects and compensates belt slippage, with fault alarm and emergency shutdown. Flexible stroke and pumping frequency can be set on HMI to improve pumping efficiency.

It provides reliable protection against rope breakage, slippage and well sticking, performing deceleration stop and brake locking under faults. Its advanced vector control collects real-time torque and power data to generate accurate dynamometer cards. Self-developed intelligent algorithms enable automatic counterweight and frequency adjustment for stable system operation.

Application of Epsilon ES500 VFD in Beam Pumping Units

China has high energy consumption per unit output, and variable frequency speed regulation effectively helps equipment save energy and boost efficiency. Pumping units consume 40% of total power in oilfields. Featuring drastic load fluctuation and high starting torque, they usually run under light load with huge energy loss. VFD renovation for pumping units has great energy-saving potential, which is a key measure for oilfields to achieve carbon neutrality and complete energy-saving upgrading.

Epsilon ES500 Regenerative VFD Solution

Widely-used beam pumping units adopt counterweight balance structure. The motor switches between motoring and generating modes in one working cycle. Traditional devices dissipate regenerative power via braking resistors, leading to serious energy waste.

Equipped with rectifier-side PWM control and four-quadrant operation, Epsilon ES500 regenerative VFD perfectly matches speed regulation demands of potential energy loads. It converts regenerative power into usable electricity and feeds it back to power grid for optimal energy saving. With THDi below 5% and power factor close to 1, it minimizes grid harmonic interference and fully meets green energy-saving standards.

Solution Features

This solution inherits advantages of traditional frequency conversion renovation. As an upgraded version integrating frequency conversion and energy feedback, it boasts exclusive superior performances:

It raises power factor from 0.25~0.5 to over 0.9, cuts supply current, eases load on power grid and transformers and reduces line power loss.

It dynamically adjusts pumping speed according to oil well liquid output, realizing energy saving and crude oil output increase simultaneously.

Soft start function avoids mechanical impact on equipment, extends service life and improves working efficiency.

Adopting IGBT-PWM rectification and genuine four-quadrant operation, it efficiently recycles regenerative energy and feeds it back to grid with overall power saving rate over 30%.

Integrated rectifier and inverter design greatly saves cabinet installation space.

Current harmonic content is kept below 5% to reduce grid pollution. Optional filter components are available for weak power grid conditions.