“Once completed, this project will be the largest and most efficient energy storage station in the world,” says Siemens LDA CEO, Hermann Kleinod. He adds that the drive system “sets a benchmark – a world-leading two-pole electric motor with an efficiency of above 98%.”
The energy storage plant will use the motor to drive a compressor, storing energy which can later be released to drive an expander, in turn driving a generator to produce electricity. Compared to other energy storage technologies, the plant is said to have a larger capacity, low self-discharge and a long lifetime, making it a cost-effective method for bulk storage of energy for grid applications.
The high-voltage motor for the Chinese plant will have a dual shaft extension and will designed to operate either as a 105MW motor or a 129MVA generator.
As well as the motor, Siemens will also supply a 40MW Sinamics GL150 starting frequency converter designed for single-motor applications with variable- and constant-torque characteristics. As a result of low switching losses and the use of low-loss thyristors, the load-commutated inverter (LCI) will operate with a claimed efficiency of 99%.
The 105MW HV motor-generator will operate with an efficiency of more than 98%
The motor will be manufactured at Siemens' oldest factory, its Dynamowerk facility in Berlin, which has been operating for 115 years.
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