A Three-Phase Weather-Dependent Power Flow Approach for 4-Wire
Multi-Grounded Unbalanced Microgrids with Bare Overhead Conductors
Abstract
Conventional power flow (CPF) algorithms assume that the network
resistances and reactances remain constant regardless of the weather and
loading conditions. Although the impact of the weather in power flow
analysis has been recently investigated via the weather-dependent power
flow (WDPF) approaches, the magnetic effects in the core of ACSR
conductors have not been explicitly considered. ACSR conductors are
widely used in distribution networks. Therefore, this manuscript
proposes a three-phase weather-dependent power flow algorithm for 4-wire
multi-grounded unbalanced microgrids (MGs), which takes into
consideration the impact of weather as well as the magnetic effects in
the core of ACSR conductors. It is shown that the magnetic effects in
the core can significantly influence the power flow results, especially
for networks composed of single-layer ACSR conductors. Furthermore, the
proposed algorithm explicitly considers the multi-grounded neutral
conductor, thus it can precisely simulate unbalanced low voltage (LV)
and medium voltage (MV) networks. In addition, the proposed approach is
generic and can be applied in both grid-connected and islanded networks.
Simulations conducted in a 25-Bus unbalanced LV microgrid highlight the
accuracy and benefit of the proposed approach.
