The Wärtsilä Synchronous condenser enables power plants to provide critical grid stability services even when the engines are not running.
Using an integrated clutch solution, Wärtsilä generating sets can seamlessly switch between power generation and synchronous condenser operation, delivering inertia, reactive power, voltage control and short-circuit strength on demand. This helps integrate more renewable energy, strengthen system reliability and unlock additional value from power plant assets.
Wärtsilä 46TS generating set with synchronous condenser feature
As renewable energy penetration grows, maintaining system strength and grid stability becomes increasingly important.
Unlike conventional power plants, inverter-based resources such as wind and solar generation do not naturally provide the inertia and short-circuit power required to maintain stable grid operation. As a result, power systems can become less stable and more vulnerable to sudden disturbances.
Synchronous condenser technology helps address these challenges by strengthening the grid and supporting reliable operation as renewable generation continues to grow.
A synchronous condenser is a grid-connected synchronous machine that operates without producing active power. By producing and absorbing reactive power, it helps maintain grid voltage while providing essential stability services that support reliable power system operation and enable higher shares of renewable generation.
A synchronous condenser supports the power system by providing:
The Wärtsilä Synchronous condenser uses an integrated clutch solution that enables Wärtsilä generating sets to seamlessly switch between power generation and synchronous condenser operation.
When power generation is not required, the clutch disconnects the engine while the generator remains connected to the grid operating as a synchronous condenser. The generator can then provide inertia, reactive power, voltage control and short-circuit strength without fuel consumption or engine operation.
This dual-mode capability enables a single asset to support both energy production and grid stability, helping customers integrate more renewable energy while maximising the value of their power plant assets.
Close-up of the Wärtsilä Synchronous condenser clutch between the Wärtsilä 31 engine and generator
1. Power generation
Engine and generator produce electricity
2. Clutch disengages
Engine disconnects when production is not needed
3. Synchronous condenser mode
Generator remains online supporting the grid
Rotating inertia helps reduce the impact of disturbances and supports stable frequency control as renewable generation increases. This help maintain reliable system operation and supports higher renewable penetration.
Fast, continuous reactive power support provides effective voltage control, improve power quality and reduces losses.
Improved system strength enhances protection reliability, supports stable operation during grid disturbances, and enables greater renewable energy penetration.
Dispatch graph to illustrate the operational philosophy
How to read the graph?
New grid support and ancillary service markets are creating additional revenue opportunities for power plant owners.
With the Wärtsilä Synchronous condenser, generating sets can create value from both electricity production and grid support services. The ability to switch seamlessly between operating modes helps maximise asset utilisation while unlocking additional revenue streams.
The Wärtsilä Synchronous condenser is available across all Wärtsilä engine platforms, including Wärtsilä 31, Wärtsilä 32, Wärtsilä 34, Wärtsilä 46TS and Wärtsilä 50.
As renewable penetration increases, flexibility and grid support capabilities become increasingly valuable.
By combining power generation and synchronous condenser operation in a single asset, the Wärtsilä Synchronous condenser helps customers integrate more renewable energy, improves the grid reliability and unlock new sources of value from their power plants.
