Publication Type:

Journal Article


IEEE Transactions on Power Systems, Volume 28, Number 2, p.1245-1254 (2013)


Admittance, Algorithms, bus voltage limits, DG penetration level, DG unit installations, Distributed Generation, distributed generation resources, Distributed power generation, distribution network, distribution networks, fault current, Harmonic analysis, harmonic coordination limits, harmonic distortion, harmonic power flow, IEEE-30 bus, IEEE-519 standard, installation, inverter-based DG units, invertors, NLP, nonlinear current, nonlinear programming, optimal location, optimal size, Optimization, optimization problem, overcurrent protection, overcurrent relay, particle swarm optimization, power balance constraints, Power quality, power supply quality, Power system harmonics, protection coordination, protection coordination limits, Relays, synchronous-based DG units


In this paper, a new optimization problem is proposed to determine the maximum distributed generation (DG) penetration level by optimally selecting types, locations and sizes of utility owned DG units. The DG penetration level could be limited by harmonic distortion because of the nonlinear current injected by inverter-based DG units and also protection coordination constraints because of the variation in fault current caused by synchronous-based DG units. Hence the objective of the proposed problem is to maximize DG penetration level from both types of DG units, taking into account power balance constraints, bus voltage limits, total and individual harmonic distortion limits specified by the IEEE-519 standard, over-current relay operating time limits, and protection coordination constraints. The DG penetration study is formulated as a nonlinear programming (NLP) problem and tested on the IEEE-30 bus looped distribution network with ten load and DG scenarios. Similarly, feasibility assessment of customer owned DG unit installations considering power quality and protection coordination is also studied. Simulation results show the effectiveness of the proposed approach, which can serve as an efficient planning tool for utility operators.

Cite this Research Publication

Dr. V. Ravikumar Pandi, Zeineldin, H. H., and Xiao, W., “Determining Optimal Location and Size of Distributed Generation Resources Considering Harmonic and Protection Coordination Limits”, IEEE Transactions on Power Systems, vol. 28, pp. 1245-1254, 2013.