By using a bulk number of supercapacitors, the new SVC PLUS Frequency Stabilizer® (SVC PLUS FS®) is a cost-efficient, compact solution that can emulate system inertia by boosting high active power into the grid when needed. It also offers voltage support by means of reactive power compensation.
While grids are undergoing fundamental changes in terms of power generation, renewable infeed and ever-growing demand, power quality and dynamic grid stability are at risk due to less synchronous power generation.
The grid frequency is balanced to 50 Hz or 60 Hz by parity of power demand and generation. The frequency must be kept within specific limits, even in the event of an imbalance: for example, from a disturbance. After a fault, the frequency can only be stabilized by an inertial response from generator-turbine sets. The mechanical kinetic energy defines the frequency drop after disturbance until the operating reserve is activated after several seconds by the primary frequency reserve (PFR). Fewer rotating machines result in shrinking instantaneous reserves, which increases the risk of exceeding critical frequency levels. This may lead to load rejection or a blackout. Grid operators are forced to keep power plants in operation in order to preserve the instantaneous reserve or to optionally invest in additional primary reserve. Some source of fast frequency response (FFR) is urgently needed to cover the gap between inertial response and operating reserves.