Modeling of series and shunt distribution facts devices in distribution systems load flow

Abstract EN

This paper presents modeling of Series and Shunt Distribution FACTS devices in load flow calculations for the steady-state voltage compensation.

For this purpose, Distribution STATCOM (D-STATCOM) and Series Static Voltage Restorer (SSVR) are respectively considered as a shunt and a series compensator.

An accurate model for each device is derived to use in load flow calculations.

The rating of these devices as well as direction of reactive power injection required to compensate voltage to the desired value (1p.u., for example) are derived and discussed analytically and mathematically using parser diagram method.

Since performance of D-STATCOM and SSVR varies when they reach to their maximum capacity, modeling of these compensators in their maximum rating of reactive power injection are derived and discussed.

The validity of the proposed models is examined using two standard distribution systems consisting of 33 and 69 nodes, respectively.

The best location of D-STATCOM and SSVR for under voltage problem mitigation in the distribution network is determined.

Also, the proposed models are compared with the earlier efficient methods in the literature in terms of computational burden and execution time.

The results show the validity of the proposed models for these distribution FACTS devices in large distribution systems.