Parallel connected synchronous condensers are mainly used for providing short-circuit power and inertia. They also help to stabilize the network through voltage recovery during faults. This becomes increasingly important with the rising share of renewable power generation that leads to a lack of short-circuit power and inertia. Due to the fact that conventional power plants are shut down, synchronous condenser solutions use a conventional generator to provide the necessary inertia and short-circuit contribution by means of its rotating mass while also providing or absorbing reactive power.
Inertia and short-circuit power are key elements of grid stability – yet their availability is shrinking. This is caused by 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. All of this influences the stability of transmission networks, resulting in a worldwide renaissance of the synchronous condenser. The Siemens Energy synchronous condenser solution comprises a horizontal synchronous generator connected to the high-voltage transmission network via a step-up transformer. It 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, 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.
Have a closer look at the Synchronous Condenser: 3D Experience
Contribution of short-circuit power
After the generator is synchronized with the network it behaves like a synchronous motor with no load, providing short-circuit power to the transmission network.
The generator is connected to the transmission network through a transformer. Either a pony motor or a static frequency converter starts it and provides reactive power when it’s synchronous to the system frequency.
Short-term overload capability
During emergencies or contingencies the synchronous condenser can provide a significantly higher rating for a short time, depending on its specifications.
Inertia to the transmission system
The generator provides the necessary inertia by means of its rotating mass while also providing or absorbing reactive power.
Our synchronous condenser solutions use a generator to provide the necessary inertia with its rotating mass while also providing or absorbing reactive power. The generator is connected to the transmission network by a transformer, and is started by either an electric motor or a static frequency converter. Once operating speed is achieved, the generator is synchronized with the network and behaves like a synchronous motor with no load, providing reactive power and shortcircuit power to the transmission network.
Many of our products and solutions are already being successfully used. Below is an example of these applications.
The latest information on Siemens Energy's synchronous condenser
Press release | With Ireland set to phase out coal-fired power generation and increase the share of electricity from renewables to 80 percent, ESB, the leading Irish utility and owner of Moneypoint, are radically transforming the site into a green energy hub. The first step? A synchronous condenser with the world’s largest flywheel.
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