Low-Voltage Network Analysis

DIgSILENT PowerFactory integrates enhanced features especially designed for analyzing low voltage networks. These functions enable the user to:

Low voltage analysis of complex meshed systems is a standard feature with DIgSILENT PowerFactory. Neutral current caused by unbalanced single-phase loading and load diversity to various sources are statistically calculated to represent a realistic network.

Stochastic Load Modeling

On the basis of defined "Customer Units" the user may specify a number of customers connected to a line. When performing a load flow, the load per unit customer is defined either by:

. In addition, the user may select between two methods for considering the stochastic nature of loads, such as:

The first method is the more theoretical approach that can also be applied to meshed network topologies. The "Maximum current estimation" only applies stochastic rules for estimating maximum branch flows. Based on the maximum current flow branch element, maximum voltage drops are calculated and added along the feeder. However, this method has its limitations in case of meshed LV networks.

Upon successful execution of the load flow, maximum currents (Imax), maximum voltage drops (dumax) and minimum voltages (umin, Umin) are displayed in every branch element and at every bus bar.

The usual variables for currents and voltages represent here average values of voltages and currents. Losses are calculated based on average values, max. circuit loading is calculated using maximum currents.

Cable Reinforcement

. The cable reinforcement procedure determines the most cost-effective option for upgrading overloaded cables. Based on specific cable costs and voltage drop limitations, the corresponding cable is automatically selected and a respective report is issued.