Verification Facility

Mitsubishi Electric successfully constructed and commissioned a fully functional back-to-back HVDC facility at its Itami Works near Osaka, Japan. The station was put into service in November 2018, and is available for customer visits.

Purpose

To support future development of HVDC-Diamond® systems and equipment, Mitsubishi Electric has built a 50 MW verification facility. The facility design and core equipment is the same as that found in our commercial products, allowing for total system integration to verified within a controllable and safe operating environment. This enables a wide variety of scenarios to be tested, which may not otherwise be feasible in an live power system.
The system has been used to verify performance over a series of tests, such as normal operation, power flow reversal, long-term thermal runs, etc.

System Topology

The verification facility has Back-To-Back (BTB) HVDC system comprised of two sets of converters, an interface transformer, AC and DC buses, and auxiliary equipment.
Once both converters are charged from the factory AC Network, the system circulates the active power between primary and secondary windings of the three-winding interface transformer.
Up to 50MW active power is possible, with the factory only supplying system losses.

Technical Highlights

Verification Facility’s major technical parameters are as follows:

Rating Value
Active Power 50MW
Nominal AC Voltage (Factory Network Side) 3-Phase 6.6kV (60Hz)
Nominal DC Voltage +/- 21kV
DC Current +/- 1,190A