Dynamic voltage compensation on distribution feeders using flywheel energy storage

Advancements in power electronics, bearings and materials have made flywheel energy storage systems viable alternative to electrochemical batteries. A future application of such a device is an uninterruptible power supply for critical loads on a distribution feeder. However, the same power electronics and flywheel system could also be used for dynamic voltage compensation. A comparison is made between series and parallel connection of such dynamic compensation techniques used to maintain rated load voltage on distribution feeders when there are momentary dips-in the supply voltage. For each case a mathematical model is presented and analyzed. The two cases are compared and the series compensation technique is more effective.