Steady State Assessment of Shunt Compensated EHV Insulated Cables by Means of Multiconductor Cell Analysis (MCA)

Abstract

Abstract:The author has already presented some papers which allow studying cable systems by means of the multiconductor cell analysis (MCA). This method considers the cable system in its real asymmetry without simplified and approximated hypotheses. The multiconductor matrix procedure based on the use of admittance matrices, which account for the line cells (with earth return currents), different types of screen bonding, possible multiple circuits (single and double circuit or more), allows predicting the steady-state regime of any cable system. In the previous papers, these matrix algorithms have been presented with reference to a short extra-high voltage (EHV) double-circuit cross-bonded (CB) underground cable (UGC) system. Since the cable link was short, the shunt reactive compensation was not necessary and consequently not considered. In this paper the procedure is generalized in order to take into account three single-phase (or also one three-phase) reactors installed at the cable ends or also at intermediate locations.

A Three-Phase Power Flow Algorithm for Transmission Networks: A Hybrid Phase/Sequence Approach

“…In general, in fact, the induced voltages in the passive conductors could not be negligible. In particular, they depend on the different screen bonding/earthing techniques (e.g., cross bonding arrangement for HV/EHV cables [36], single-point bonding for very short HV/EHV cables, and solid bonding arrangements for MV/LV cables). Differently for GILs, the solid-bonding arrangement (or even the multiple point-bonding [37,38]) allows considering the enclosure voltages practically null.…”

“…Their admittance matrices can be easily computed by means of the inspection method or by inversion of their impedance matrices [28] and must be overlapped in the suitable positions of the three-phase admittance matrix ABC N Y [36].…”