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Efficiency of 105MW two-pole motor will exceed 98%

13 August, 2021

Siemens Large Drives Applications (LDA) is building a “world-leading” 105MW two-pole motor-generator with an efficiency of more than 98% for use in a Chinese energy storage project.

“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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