CONTROL SYSTEM FOR A POWER CONVERTER AND METHOD OF CONTROLLING OPERATION OF A POWER CONVERTER PRIOR APPLICATION INFORMATION

摘要

A control system (20) for a power converter (22) designed to convert DC powerfrom a source (30) such as a battery, flywheel or fuel cell into AC power. Thecontrol system includes an impedance current regulator (106) for providing animpedance current signal to a summing unit (110) where it may be combined withreal and reactive current command signals provided from respective sources(62, 64). The resultant current signal provided by the summing unit isprovided to a voltage correction unit (112) that uses the resultant currentsignal in developing a correction voltage signal provided to the powerconverter. The correction voltage signal contains information used by thepower converter in adjusting the real and reactive currents in its output ACpower based on the ability of the AC power network to accept changes incurrent. Multiple power converters having the control system of the presentinvention may be connected in parallel to a single AC load or multiple ACloads, without the need for a separate control system interconnecting thepower converters. The control system may be advantageously incorporated into adistributed generation network and in uninterruptible power systems, whetheror not such systems are included in a distributed generation network.