Dynamic measurement of frequency and ROCOF in modern power electricity networks
Use Cases
Here are a few examples of use cases for typical scenarios.
Oscillations damping
A cutting-edge proprietary system that can quickly self-adjust to true subynchronous oscillations. With automatic tuning, it can output a sequence of power bumps directly to the PPC, BESS or any control system. When implemented across a region, it can dampen oscillations quickly and effectively, preventing damage to generators and passive elements, and helping to stabilise the system.
Synthetic/virtual inertia
Taking a reliable measurement of ROCOF in just 1 cycle enables an almost instantaneous response, thus successfully emulating a rotating machine. Since the coefficient of determination provides an indication of the quality of the ROCOF measurement (between 0 and 1), there is no risk of misinterpreting the value, and it is not necessary to take 25 cycles, for example, to account for errors. Rather than investing in expensive rotating machines, inertia can be emulated and delivered by IBRs (e.g. BESS or PV).
Fast Frequency Response
Frequency calculation takes just 1 cycle, enabling an ultra-fast response by the installation. Slower averaging windows, such as 5 or 10 cycles, are also available in case they are needed. The device can be queried via MODBUS RTU over RS485, MODBUS TCP or HTTP REST. This makes its integration with the PPC, BESS, SCADA or any control system straightforward.
Wide Area Monitoring
Synchronised measurements make distant readings comparable.
Dominant intra- and inter-area oscillations are automatically detected at any point and can be visualised across vast geographies in real time. This enables visual inspection of propagation and delays.
Frequency, ROCOF and voltage measurements at 1, 5, 10, 25 and 50 cycles are calculated simultaneously 100 times per second, enabling fast and slow assessments.