Equipped for the future with SMA know-how
Providers of decentralized grid services and an intelligent interface to the supply grid: That describes the solar inverter of the future. The utility operators have also
recognized that inverters are particularly predestined for the pending grid manage- ment responsibilities – and demand these system services to an ever greater extent. SMA makes an important contribution to this with its products.
SMA inverter grid management functions
c) Control of the reactive power via a characteristic curve The reactive power or the displacement factor is controlled by a pre-defined characteristic curve – depending on the active power fed into the grid or the grid voltage.
Limited dynamic grid support The inverter feeds into the grid again immediately after short-term voltage drops – as long as the grid voltage is within a defined voltage range.
Dynamic grid support LVRT (Low-Voltage Ride Through): The inverter stays connected to the grid during voltage drops and supports the grid by feeding reactive power.
a) Dynamic specification of the reactive power by the utility operator The utility operator defines a dynamic displacement factor – any value between cos(ϕ)lead- ing= 0.90 und cos(ϕ)lagging= 0.90. It is transmitted via a communication unit. The SMA Power Reducer Box performs the evaluation.
Remote-controlled power reduction in case of grid overload In order to avoid short-term grid overload, the grid operator presets a nominal active power value which the inverter will match within 60 seconds. The nominal value is transmitted to the inverters via a ripple control receiver in combination with the SMA Power Reducer Box. Typical thresholds are 100, 60, 30 or 0 per cent of the nominal power.
Frequency-dependent control of active power As of a grid frequency of 50.2 Hz, the inverter automatically reduces the active power output according to a definable characteristic curve, helping to stabilize the grid frequency.
Static voltage support based on reactive power SMA inverters feed capacitive or inductive reactive power to the grid in order to stabilize the grid voltage. Three different modes are available:
a) Fixed specification of the reactive power by the utility operator The utility operator defines a fixed reactive power value or a fixed displacement factor be- tween cos(ϕ)leading= 0.90 and cos(ϕ)lagging= 0.90.
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