Development of 300 MW frequency converter

An extremely high-reliability 300 MW frequency converter has been developed. To achieve high reliability, the frequency converter adopts several dual (redundant) methods. The fault-system-lock function and the online recovery function greatly enhance the system reliability, allowing the Shin-Shinano FC to continue to operate almost without any stoppages due to faults. Highvolume, non-volatile CPLDs are utilized in the controller, and a simple controller configuration is also achieved, which makes maintenance easy.