Siemens has received an order for an HVDC (high-voltage direct-current) back-to-back link to connect the power supply networks of India and Bangladesh. On a turnkey basis, Siemens will be responsible for engineering, installing and commissioning of the complete HVDC system. The customer is Power Grid Company of Bangladesh (PGCB). Siemens has already installed block 1 of the Bheramara HVDC back-to-back station in 2013 and will now deliver a second block with a transmission capacity of another 500 megawatts (MW). The order value is approximately 130 million EUR and the power link is scheduled to come on line in the second half of 2018.
“We are pleased to announce another order from our valued customer PGCB,” states Mirko Düsel, CEO of Siemens’ Transmission Solutions Business Unit. “With the implementation of Bheramara’s second block, Siemens helps to further grow reliable power sources and strengthen grid stability. The availability of reliable power transmission is key for emerging countries like Bangladesh.”
Siemens' scope of supply compasses delivery of all electrical components including the control, protection and monitoring systems for the HVDC system, the thyristor valves, eight converter transformers and the AC filters. Siemens’ proven HVDC Classic technology with its fast control function will contribute toward stabilization of the connected systems, which is a key benefit in the event of grid disturbances. Furthermore this high capacity power link will make sure to avoid bottlenecks on the 230 kV side of Bangladesh. The station of the HVDC back-to-back link will be located in Bheramara at the Western border of Bangladesh, where it will be connected via a substation and overhead line with India’s 400-kilovolt (kV) grid.
With a back-to-back HVDC link two independent neighboring transmission systems with incompatible electrical frequencies, exceeding short-circuit power levels or different operating philosophies are connected. Rectifier (conversion of AC to DC) and inverter (conversion of DC to AC) are located in the same station, as known as back-to-back. DC links are used to enhance weak AC links by transmitting large amounts of active power and facilitating fast controllability of the power flow, esp. when the existing networks have reached the limit of their short-circuit capability.
Recently Siemens has received another order from PGCB to design, procure, supply, install, test and commission 230/132kV gas insulated switchgear (GIS) substation along with 225/300 MVA, 132/33 KV and 50/75 MVA transformers at Keraniganj near Dhaka, the capital of Bangladesh.