Siemens SINAMICS S120 System Manual page 112

Commissioning
7.7 Commissioning the grid droop control
9. r5482 = 108: Black start complete grid check
It is checked as to whether voltage and frequency of the island grid lie within the
permissible tolerance limits (p0282 < r0072[2] < p0281 and p0285 < r0066[1] < p0284).
10.r5482 = 109: Black start completed
Settings
The island grid black start is configured using p5580.
● 0: Deactivated
● 2: Grid black start:
A black start is executed, precondition is that the grid voltage is less than p5586[0].
● 3: Grid black start automatic:
– a) When the grid voltage is less than p5586[0] a black start is executed (same as for
– b) When the grid voltage lies between p0281 and p0282 and the frequency between
– If neither a) nor b) are fulfilled, then the system waits, and after the time in p5581[2]
Notes
● Frequently, the grid infeed is connected to the island grid through a transformer. Using
the "Black start" function, this transformer is magnetized together with the grid along a
ramp. Switching-in a transformer in a no-voltage condition to an island grid already at its
specific voltage level generates high inrush currents and grid harmonics, and should
therefore be generally avoided.
Using the "Transformer magnetization" function (p5480 = 1) in these cases (no black
start) the transformer voltage can be softly increased before normal synchronization of
the grid infeed with the grid.
● The "Black start" function requires the same BiCo connections as the "Transformer
magnetization" function (p5480). For a black start, together with the magnetization of the
grid transformer, the connected island grid is also established.
● The 2nd VSM10 that is mandatory senses the grid voltage at the grid side of the circuit
breaker between the infeed and island grid (FP 7990).
The voltage measured values are displayed in parameters r5461[0] / r5462[0] and are
used as inputs for the voltage conversion in the transformer model (p5487[0] = r5461[0],
p5487[1] = r5462[0]. The transformer ratio (between the island grid and infeed input) is
set using p5486[0].
● The phase shift of the voltage between the island grid and the grid filter voltage must be
set in parameter p6420[0].
Remaining gain errors (e.g. caused by measuring transformers) can be corrected using
parameter p6421[0].
The determination or check can be realized, for example, using a trace or by evaluating
parameter r3661 (secondary side of the transformer) and r5461[0] (primary side of the
transformer, island grid).
112
p5580 = 2).
p0284 and p0285, then the infeed is synchronized with the already existing island grid.
expires, the switch-on attempt is canceled with fault F6503.
System Manual, 04/2015, A5E03347436A
Grid infeed