Vycon Theory of Operation

The VDC140 is designed to work with a UPS system and taps into the same DC bus for both charging (motoring) and discharging (generating) power.

The VYCON Direct Connect 140 (VDC 140) is a flywheel energy storage system that consists of two major subsystems:
  • The flywheel module, which includes the high strength steel hub (flywheel rotor), high speed permanent magnet motor/generator, and a five axis active magnetic bearing system.
  • Power Conversion module (converter) A three-phase bi-directional Insulated Gate Bipolar Transistor (IGBT) bridge (i.e., AC/DC converter) used for both motoring and generation.
The output and input to the VDC140 is through a DC bus which is connected to the converter.

The converter creates a sine wave from the DC bus to drive the flywheel during motoring, and converts the varying sinusoidal frequency from the flywheel into DC voltage during generation (i.e.,energy discharge).

Energy is removed from the flywheel rotor by the generator In the VDC140, the energy discharge occurs between a full operating speed of 36,000 rpm down to 24,000 rpm capable of providing 140 kW of power for 15 seconds.

A simplified block diagram of an Uninterruptible Power Supply (UPS) that uses the VDC140 for continuous power conditioning and power source back-up is shown here:

In the event of a loss of line input from the utility grid, the VDC140 immediately goes into discharge mode, maintaining the DC bus of the UPS to support the critical loads with no interruption.

Upon restoration of input power by a generator set (genset) or recovery of the utility, the VDC140 recharges the flywheel to full operating energy and awaits the next event.

The VDC140 can be used in a variety of applications including back-up power during genset ride-through and battery hardening.

Graphical User Interface (GUI) software and remote communication capabilities provide convenient control and monitoring of performance parameters.