Variable speed drives (VSDs) are used to control electrical submersible pumping (ESP) systems and surface pumps. They enable adjustments to be made to production parameters and ESP output when downhole conditions change. Increasing and decreasing motor speed can be used to optimize pump performance, speed or slow production, and avoid gas locking and system cycling. VSDs protect pumps and motors by reducing electrical stress on startup and by adjusting to dynamic conditions as they change. The ability to vary the drive speed reduces the need to replace components, cuts downtime, and lowers costs while improving system runlife.

The correct setting of the mode and timely adjustment of the ESP operation determines not only the daily flow rate of the well, but also other economic indicators of its operation. These include reliability, safety, energy efficiency, etc.

The dedicated special algorithms of VSDs operational system strengthen resources of oil production Companies, significantly save the time of service engineers and contribute to the growth of oil industry. EPS VSDs helps oil and oilfield service companies receive the maximum benefit.

The dedicated low-voltage variable frequency drive (VFD) for ESPs is specifically engineered for submersible pump frequency conversion applications. Designed to address the unique load characteristics of ESP systems, this series adopts a two-level inverter + output sine wave filter architecture combined with a high-performance V/f control algorithm, ensuring stable and reliable operation of ESP units under variable-frequency drive conditions. Control system software helps you reduce power and downtime costs while optimizing production. 
To meet diverse user requirements, the drive incorporates specialized startup, control, and protection functions tailored for challenging well conditions, including:

● Sandy wells with difficult startup due to sediment accumulation
● Gassy wells experiencing significant load fluctuations
● Heavy oil wells with high-viscosity fluid loads 

These enhancements ensure superior adaptability when paired with ESP systems in complex downhole environments.

Technical feature of Medium-Voltage ESP (Electric Submersible Pump)

 Medium Voltage Product Design Features

-  Input AC Filter: For input power balance.
-   Output Sine Wave Filter: Standard configuration, ensuring output THD (Total Harmonic Distortion) is less than 5%.
-   Emergency Stop Access Points: One installed on the front door with an emergency stop button. Other assembled in the wiring terminals (dry contact) for external customer emergency stop control.
-  Easy Data Download: Simple download of data, alarms, and logs via the front door USB port using a USB disk.
-  Optional Power Meter: For monitoring input power parameters and total power consumption.
-  Modular Internal Structure: Featuring a drawer-type main circuit structure for convenient field maintenance.
-  Excellent Environmental Adaptability: Capable of long-term reliable operation within an ambient temperature range of -40°C to +50°C.
-  Main Circuit Capacitors: Utilize film capacitors, offering a longer lifespan compared to conventional electrolytic capacitors.
-  User-Friendly HMI: Equipped with a 10-inch LCD resistive touchscreen, supporting both Chinese and English operating interfaces.
-  Circular Chart Recorder: Configured with current charts to enhance diagnostic efficiency for Electrical Submersible Pump (ESP) well conditions.
-  UPS Configuration: Ensures control power supply stability.
-  Multi-Tap Control Transformer & Selector Switch: Allows adjustment of control power supply voltage without wiring modifications.
-  Three-Level Topology: Delivers high efficiency and reduced grid pollution.

Medium Voltage Product Functional Characteristics
-  ESP-Specific Application Functions: Four start modes (Torque Boost, Synchronization, Impact, Swinging) for starting pumps stuck in wells or resolving gas locking situations
-  Diverse Frequency Reference Modes: In addition to conventional manual frequency setting, provides current mode, pump intake pressure mode, gas lock release frequency follow mode (Enables meeting complex field operation requirements).
-  Unique Energy Optimization Control: Maintains ESP operating current at the minimum value, reducing heat generation in the submersible motor and cable.
-  Comprehensive Safety Protection Mechanisms: Includes protection against over-voltage, under-voltage, over-current, short circuit, underload, output three-phase current imbalance, input phase loss, downhole sensor parameter protection, and external fault protection.
-  Built-in PID: Enables closed-loop process control of operating current and pump intake pressure.
-  Three Run Command Channels: Operation panel command, control terminal command, RS485 serial communication port command.
-  Fast Current Limiting Function: Minimizes over-current faults to protect the normal operation of the VFD (Variable Frequency Drive).
-  SCADA Access via RS485: Compatible with multiple downhole sensors, displaying data on the HMI.
-  Automatic Fault Restart Function.