Repurposing Existing Generators

As more inverter based renewable energy resources are added to electrical power grids around the world, traditional fossil fuel or nuclear power plants are being decommissioned and we are losing the reactive power, inertia and fault current provided by these large rotating machines.

It is possible to repurpose the existing generator from the plant so it operates as a synchronous condenser. Existing grid connections and control systems are maintained and conversion is lower cost than a new plant and quicker to implement.

A report published by the Australian Energy Market Operator (AEMO), highlighted the following potential benefits:

• Faster implementation times than procuring new synchronous condensers in a tightening international market – repurposing could potentially be achieved in 12-24 months at some sites with new investments taking 30+ months,

• Larger scale, given that the existing generators typically have higher ratings than new SCs, and

• In most cases, lower costs than new synchronous condensers.

The SSS Clutch can be added to an existing system between the turbine and the generator and where there is a speed reduction gearbox, this can often be done without moving the turbine or the generator. The existing gearbox is replaced with a new unit that incorporates the SSS Clutch in a quill shaft arrangement.

The other option is to disconnect the turbine and attach a pony motor with an SSS Clutch to accelerate the generator up to operating speed. In this case the turbine can be mechanically reconnected on a seasonal basis as required.

SSS can help advise how a clutch can be added to an existing installation so that you can repurpose your old power plant and help with the Energy Transition.