Function Module, Dynamic Grid Support; Dynamic Grid Support - Siemens SINAMICS S120 System Manual
Grid infeed
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Also See for SINAMICS S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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Function modules
5.3 Description of the function modules
5.3.3
Function module, dynamic grid support
The function module includes the "Dynamic grid support" function to support the grid when
voltage dips occur – and the "Grid monitoring anti-islanding" function in order to detect an
undesirable creation of an island grid.
The "Dynamic grid support" function is used to ride through grid faults in a current-controlled
or grid current-impressed operation with DC link voltage control in the Active Line Module.
Typical application examples include photovoltaic inverters or grid inverters belonging to
wind turbine systems connected to a power distribution network. Contrary to this, in the
previous chapter, grid voltage-impressed operation without DC link voltage control for island
grid applications was discussed.
5.3.3.1
Dynamic grid support
The "Dynamic grid support" function controls the network in the event of voltage dips for a
defined time, as stipulated by the regional network operators.
Non-symmetrical currents can be specifically compensated using a dedicated current control
for negative sequence systems.
The infeed systems in a medium-voltage network must participate in dynamic grid support,
typical applications include for example:
● It is not permissible that they are disconnected from the grid when grid faults occur.
● During a grid voltage fault, they must support the grid by injecting reactive power (e.g.
during a grid short-circuit by providing
a short-circuit current).
● They may not draw more inductive reactive power after clearing the fault than prior to
occurrence of the fault.
Function
The dynamic grid support includes the necessary additional functions for monitoring and
control of the grid. This allows most of the important grid codes to be satisfied.
It must be checked on a case-for-case basis whether different codes are also fulfilled and, if
necessary, parameter settings must be adapted accordingly.
With dynamic grid support activated, the regulated boost mode of the Active Line Module is
maintained even when network incidents occur (amplitude and phase errors in the network
voltage). The grid is supported by injecting an additional reactive current, which is calculated
according to a parameterizable characteristic, as a function of the grid voltage fault.
The supplementary setpoint for the reactive current controller causes an increase of the
output voltage if the line voltage is too low, and reduction of output voltage if the line voltage
is too high.
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System Manual, 04/2015, A5E03347436A
Grid infeed
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