Short circuit calculation in networks with a high share of inverter based distributed generation

Abstract

Abstract-Conventional short circuit calculation programs do not consider the actual behavior of inverter based distributed generation (DG). Several techniques to consider them have been suggested in literature and are briefly described in this paper. A tool is developed with the combination of these techniques. The approach uses standard short circuit calculation tools and accommodates inverter based DG with different fault responses. The approach is evaluated and compared against other techniques using a realistic test distribution network model.

Probabilistic Short-Circuit Current in Active Distribution Networks Considering Low Voltage Ride-Through of Photovoltaic Generation

“…The above model only focuses on the steady-state short-circuit current of photovoltaic generation under different fault conditions, and the equivalent model of photovoltaic generation in the fault transient stage has not been studied. In terms of short-circuit current calculation, literature [12] puts forward the algorithm of short-circuit current in the radial distribution network considering the current-limiting characteristics of photovoltaic generation, while literature [11], [13]- [15] puts forward the calculation method of three-phase short-circuit current and asymmetric current which including photovoltaic generation based on the superposition principle. But those methods only focus on the calculation of certainty short-circuit current and do not consider the random factors such as system failure so that it does not calculate the uncertainty of photovoltaic power in the process of low voltage ride-through.…”

Calculation of relay currents in active weakly-meshed distribution systems

“…This procedure deals with radial systems and provides only a rough idea for calculation of meshed distribution systems. Several recently developed short-circuit calculation methods for active distribution systems are based on EVS [4]- [5], or on very similar methods [6]- [7]. All of these methods neglect the influence of loads, the shunt parameters of network elements and the pre-fault state in order to simplify the calculation procedure.…”

“…The proposed procedure is fast and easy for programming. Since it deals with an actual system model without neglecting the previously listed three effects, the results obtained are much more accurate than by the oversimplified methods commonly used [1]- [7]. The results obtained by BFS were compared with those obtained by EVS.…”

Homotopy‐enhanced short‐circuit calculation for general distribution networks with non‐linear loads

“…Short‐circuit calculations (SCCs) are needed for the proper design of the protection systems of distribution networks. Traditionally, both the phase coordinate‐based solution methods [1–5] and the symmetrical components‐based methods [6, 7] have been used for SCC. However, these methods do not seem to support non‐linear loads such as ZIP (constant power, constant current, and constant impedance) type.…”