  This paper presents an extensive multi-period optimal power flow framework,
with new modelling elements, for smart LV distribution systems that rely on
residential flexibility for combating operational issues. A detailed
performance assessment of different setups is performed, including: ZIP
flexible loads (FLs), varying degrees of controllability of conventional
residential devices, such as electric vehicles (EVs) or photovoltaics (PVs), by
the distribution system operator (DSO) (adhering to customer-dependent
restrictions) and full exploitation of the capabilities offered by
state-of-the-art inverter technologies. A comprehensive model-dependent impact
assessment is performed, including phase imbalances, neutral and ground wires
and load dependencies. The de-congestion potential of common residential
devices is highlighted, analyzing capabilities such as active power
redistribution, reactive power support and phase balancing. Said potential is
explored on setups where the DSO can make only partial adjustments on customer
profiles, rather than (as is common) deciding on the full profiles. The
extensive analysis can be used by DSOs and researchers alike to make informed
decisions on the required levels of modelling detail, the connected devices and
the degrees of controlability. The formulation is computationally efficient,
scaling well to medium-size systems, and can serve as an excellent basis for
building more tractable or more targeted approaches.
