Power generation and distribution
Power generation and distributionWhitepaper grid stability (PDF 44kB)
Supplier-side separation - grid and system protection
Grid and system protection is switched between a decentralized energy producer, such as a photovoltaic system, for example, and the grid of the public energy supply company (EVU) and continuously checks the grid quality. If the voltage or frequency in the public grid rises or falls beyond permissible limits, the small power station is immediately decoupled. Now the grid operator can ensure that the grid is stable again. Only then can small power stations be reconnected.
Consumer-side separation - NSO
TELE’s NSO disconnects consumers in a controlled manner as soon as the grid becomes unstable. Two scenarios are possible: Either the grid operator sends a signal in the event of grid problems, or the NSO can also itself directly measure if the grid is unstable, when, for instance, the frequency drops impermissibly. Only once the grid is stable again will the NSO automatically connect the consumer back into the grid. Additionally, the corresponding data can be read and made further use of via a communication module on various devices, such as industrial PCs and cellphones.
Avoid feeding - load monitor G2BM
If it is desirable to generally avoid feeding into a grid, the G2BM load monitor from TELE is used. It works via effective power capturing, optionally in single and 3-phase grids, with an adjustable threshold value and separately adjustable start-up bridging and trigger delay. If you use underload monitoring, the device switches off if the consumption falls below a certain threshold value. If negative energy is consumed, i.e. fed in, it is also switched off.
Detecting short-term interruptions - V2UF brown-out detector
Short interruptions in the grid can lead to undefined conditions in control cabinets. To prevent this from happening, the V2UF brown-out detector from TELE ensures continuous voltage monitoring, detects grid brown-outs/short interruptions of at least 10 ms, and guarantees a safe switch off/on of downstream consumers. In this way, the device prevents components in the control cabinet reacting to short interruptions with undefined states and produces a reset pulse for a controlled restart after a power failure.