Three–Phase Time–Domain Simulation of Very Large Distribution Networks

Abstract

This paper presents a detailed three-phase analysis of very large real-life distribution networks using the Electromagnetic Transients Program (EMTP). All main network elements, including relay protection devices, are accurately modeled considering their control sequences. Model validation is achieved with steady-state and transient simulations. The time-domain results are compared with field-validated load-flow simulations for several loading conditions including first and second contingencies. Simulations of fault conditions are also matched against known results at different locations around the network. Moreover, time-domain simulations of recorded transient events show very good agreement. Different transient scenarios are investigated. The new program can be used for the assessment of symmetrical as well as unsymmetrical faults, for studies of different switching scenarios, penetration of distributed generation, and smart grid technologies.

EMTP Model of a Bidirectional Cascaded Multilevel Solid State Transformer for Distribution System Studies

“…As supported from several references, EMTP-type tools can be used to analyze large-scale smart grids; see for instance [32,33]. Although the number of cascaded modules included in the present model for each single-phase SST branch is probably low, the performance with a higher number of modules per phase would be basically the same (except for the ripple exhibited by the primary side currents); the present representation can even be useful in the design of the SST.…”

Statistical Inference for Visualization of Large Utility Power Distribution Systems

“…Studies [7,8,[10][11][12][13][14][15]17,18,24,25,27,29] show the application of this approach to validate proposed strategies or devices. In summary, the following are examples of typical applications for snapshot analysis and validation:…”

“…For instance, studies [7,9,[14][15][16][19][20][21][22][23][24][26][27][28]30] show that the information obtained from this approach is compelling evidence for design and corroboration in many applications. In summary, the following are growing uses of time-sequential simulations in smart grid studies: It is possible to classify several time-sequential simulation approaches in terms of the ratio of computation time over simulated time.…”

Three-Phase Dynamic Simulation of Power Systems Using Combined Transmission and Distribution System Models

“…TPDA simulated 1 second of this model in 16 minutes using an integration step of 4 samples/cycle. [21] reports that when EMTP-RV was used to simulate a single line to ground fault in a distribution network that contained around 37,000 elements, it took 9.7 hours to solve the main system of equations for 11 cycles implying that a full second of simulation would have taken about 53 hours -134 times longer than TPDA after adjusting for different system sizes. The machine used in case study 3 had 8 GB RAM and 2.4 GHz Intel Core i7-5500U processor while that used in [21] had 24 GB RAM and 3.33 GHz Intel Core i7-975 processor.…”