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MMC
Based on the rich experience on engineering, NR developed the UPFC IGBT valve with excellent performance, high reliability, small installation space and facility to be maintained.
MMC adopts the compact vertical integrated structure of converter valve tower with layered and split phase design to satisfy the low DC voltage applications of UPFC engineering. This favours electrical symmetry of three-phase arms of converter valve and reduces the external electromagnetic radiation and converter valve installation space.
According to IGBT valve’s charge characteristics during the start of UPFC, it uses ultra-low voltage of self-powered supply and active voltage-equalizing strategy to reduce the possibility of valve’s uncontrolled state and improve the reliability of IGBT valve’s startup and operation.
Adoption of ultra-low leakage inductance and digital drive technology in developing UPFC power valve module ensures operational safety margin of power devices. This also helps maximize the rational utilization of the power devices’ operating parameters, increase operational efficiency of converter valve and reduce the electrical stress of core power component.
Based on hardware detection and state prediction technology, it realizes the monitoring and protection of electrical and non-electrical quantities of IGBT valve in full range. It ensures that the operational converter valve can be monitored. The valve control system can send up the real-time status of converter valve and its sub-modules complying with IEC-61850 protocol to the HMI. The operator can check the electrical and non-electrical quantities of valve to reduce unplanned outage of converter valve.
The system adopts the valve control unit with microsecond control precision to increase the dynamic response capability of UPFC IGBT valve. It realizes perfect monitoring function of IGBT valve sub-module to achieve fast protection capability against sub-modules’ over-voltage and over-current states.
It utilizes the advanced separated module and component schema for maintenance. Pluggable boards in the module and standard interface terminals facilitate troubleshooting and maintenance.
