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SREĆKOVIĆ, N., BELIČ, E., ŠTUMBERGER, G.
COMPARISON OF METHODS FOR LOAD FLOW CALCULATION IN LOW VOLTAGE DISTRIBUTION NETWORK WITH CONNECTED DISPERSED PRODUCTION
KOMUNALNA ENERGETIKA / POWER ENGINERING, 8
Load flow analysis represents one of the core methods used in modern distribution system operation. Therefore, it is necessary to provide efficient, numerically robust load flow algorithms with fast convergence and minimum usage of memory, suitable for variety of operating scenarios. The paper presents, compares and evaluates two efficient methods for load flow calculation in distribution network – backward/forward sweep method and direct method. The procedure of modeling the distribution network elements – line sections, loads, distributed generation units, as well as the implementation of algorithms, has been presented. The analysis has been performed on low voltage distribution network system.
BELIČ, E., DEŽELAK, K., ŠTUMBERGER, G.
A LINE VOLTAGE DEPENDENCY ANALYSIS ON ACTIVE AND REACTIVE POWER FLOW AT DIFFERENTC LOW VOLTAGE LINES
KOMUNALNA ENERGETIKA / POWER ENGINERING, 9
The paper provided presents a line voltage dependency analysis on active and reactive power flow. The line voltage dependency is studied based on analytical expression. For the analysis it is assumed that one end of the line is connected to infinite bus, while at the other end voltage is observed in dependency of active and reactive power flow. The analysis covers three different low voltage cables with two different lengths. The results shows that in low voltage network voltage significantly depends on active power flow, while reactive power flow dependency is minimal. Voltage dependency increases, when low voltage lines are extended.
HRASTNIK, D.
Analysis of the Impact of Distributed Power Generation on Distribution Network in Upper Savinjska Dolina
KOMUNALNA ENERGETIKA / POWER ENGINERING, 201
The load flow calculation is one of the main functionalities incorporated in modern distribution network management systems. In this article, an already known load flow calculation method, combined with an optimization procedure, is applied and tested in the case of real distribution network in Zgornja Savinska dolina (upper part of valley Savinjska dolina), more precisely on distribution lines Rastke and Logarska dolina. The impact of electrical energy produced in distributed generation units on discussed distribution network is evaluated. The optimization procedure is applied to determine the reference values for active and reactive power generation in distributed generation units connected to the low voltage side of distribution transformers, where the impact of generated active and reactive power on voltage profile and distribution network losses in medium voltage network is analyzed.
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