Joint emergency drill conducted for Macao-Guangdong interconnection

To ensure the smooth operation of the Macao-Guangdong interconnection network, a joint emergency drill was conducted between three concerned groups.

Power and Networks Dispatch Department of CEM, together with Guangdong Power Dispatch Centre of GPG, and Networks Dispatch Center of Zhuhai Power Supply Bureau, conducted the drill to test the emergency response ability of and the cooperation.

This will also test their dispatchers’ understanding and familiarity in term of the environment.

The drill simulated a situation that the power supply through all five 220kV cables connecting Macao and Guangdong’s power grid was totally interrupted and could not be restored in a short time, and the power supply of all CEM’s power stations was suspended at the same time. Under such situation, the 110kV stand-by interconnection connecting Guangdong and Macao was initiated, and later CEM’s power stations resumed their operation. When the 220kV interconnection was repaired, the power supply was switched to the 220kV interconnection, and the operation of Macao’s power supply network got back to normal.

To cope with the increase in power demand and improve the reliability of power supply from Guangdong, CEM spent MOP 424 million to build the second 220kV interconnection connected with GPG.
Located between Cotai Strip and Heng Qing Island, the interconnection includes a 26km cable backbone, the Lotus Substation and two 350MVA transmission cables. Under the N-1 safety standard, the importation capacity is substantially increased to 900MVA. It will effectively improve the reliability of power supply from the China Southern Power Grid Co. Ltd. and the stability of electricity prices.

At present the new interconnection is undergoing testing.

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