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The global climate change poses new challenges for power generation and transmission. Synchronous condenser solutions are being introduced worldwide to contribute to an optimized use of energy resources and offer grid support for today’s and tomorrow’s sustainable, secure and efficient power supply.
Siemens offers tailor-made turnkey synchronous condenser solutions to address the customers’ needs based on proven, reliable in-house equipment, extensive know-how on transmission system requirements, and project execution experience.
The addition of renewables-based power generation to the energy mix, phase-out of thermal power plants, new HVDC systems, and the extension of power supply systems to remote areas influence the stability of transmission networks.
Synchronous condensers support and improve power transmission quality for a wide range of application:
The installation of synchronous condenser systems offers the benefits:
The Siemens synchronous condenser solution comprises a horizontal synchronous generator connected to the high-voltage transmission network via a step-up transformer.
Siemens supplies a broad range of generators up to 1,300 MVA on full speed. The generators are air, hydrogen, and water-cooled techniques.
The synchronous generator is started up and stopped with a frequency-controlled electric motor (pony motor) or a starting frequency converter.
When the generator has reached operating synchronous speed depending on the system frequency, it will be synchronized with the transmission network, and the machine is operated as a motor providing reactive and short-circuit power to the transmission network.
Synchronous electrical machines, like synchronous generators can generally be used as synchronous condensers. Without active power delivery (or consumption) the machines can act like a capacitor or like a reactor, depending on the excitation field current.
Since the first introduction in the Siemens FACTS portfolio several synchronous condenser solutions have been in operation.
Siemens installed three 60-MVAr synchronous condensers at the Georgia Black Sea HVDC station in June 2012. This synchronous condenser solution will support the transmission network between Georgia and Turkey with the required short-circuit power in order to operate the newly installed HVDC back-to-back station.
In Denmark, Siemens has delivered a 250-MVAr synchronous condenser solution that will start operation in summer 2013, providing the transmission system with a short-circuit power of more than 800 MVA in addition to reactive power control. The installation of this standalone synchronous condenser solution will enable the transmission system operator Energinet.dk to operate the transmission network without the need for a large thermal power plant. This makes the installation an economically and environmentally advantageous investment enabling the infeed of large amounts of renewable energy into the transmission network.