Power quality improvement using distribution static compensator with energy storage system

Increasing automation in modernindustry and deregulation have changed the requirements on power quality. Computer and process control equipment as well as drive converters are sensitive to deviations of the line voltage from the ideal sinusoidal. Voltage sags, harmonic distortion, flicker and interruption of power supply are the most common problems. In an increasing number of cases, where conventional equipment cannot solve these problems, PWM converter-based shunt- and series connected power conditioners named DSTATCOM (distribution static compensator) and DVR (dynamic voltage restorer) have been introduced. With energy storage added to the power conditioner, even more flexibility in system operation and planning is provided for utilities and industry. In the paper, the application areas of the DSTATCOM with energy storage are discussed in detail, followed by the derivation of the converter level control system of the device enabling fast dynamic active power compensation. The presented control system was tested with digital simulation in the NETOMAC program system.