scholarly journals Modeling of Doubly Fed Induction Generators for Distribution System Power Flow Analysis

2021 ◽  
Author(s):  
Amitkumar Dadhania
Keyword(s):  
Wind Turbine ◽  
Distribution System ◽  
Power Flow ◽  
Distribution Systems ◽  
Green Energy ◽  
Flow Method ◽  
Proposed Model ◽  
Three Phase ◽  
Doubly Fed ◽  
Power Flow Method

Large-scale integration of Wind Generators (WGs) with distribution systems is underway right across the globe in a drive to harness green energy. The Doubly Fed Induction Generator (DFIG) is an important type of WG due to its robustness and versatility. Its accurate and efficient modeling is very important in distribution systems planning and analysis studies, as the older approximate representation method (the constant PQ model) is no longer sufficient given the scale of integration of WGs. This thesis proposes a new three-phase model for the DFIG, compatible with unbalanced three-phase distribution systems, by deriving an analytical representation of its three major components, namely the wind turbine, the voltage source converter, and the wound-rotor induction machine. The proposed model has a set of nonlinear equations that yields the total three-phase active and reactive powers injected into the grid by the DFIG as a function of the grid voltage and wind turbine parameters. This proposed model is integrated with a three-phased unbalanced power flow method and reported in this thesis. The proposed method opens up a new way to conduct power flow studies on unbalanced distribution systems with WGs. The proposed DFIG model is verified using Matlab-Simulink. IEEE 37-bus test system data from the IEEE Distribution System sub-committee is used to benchmark the results of the power flow method.

scholarly journals Modeling of Doubly Fed Induction Generators for Distribution System Power Flow Analysis

2021 ◽  
Author(s):  
Amitkumar Dadhania
Keyword(s):  
Wind Turbine ◽  
Distribution System ◽  
Power Flow ◽  
Distribution Systems ◽  
Green Energy ◽  
Flow Method ◽  
Proposed Model ◽  
Three Phase ◽  
Doubly Fed ◽  
Power Flow Method

Large-scale integration of Wind Generators (WGs) with distribution systems is underway right across the globe in a drive to harness green energy. The Doubly Fed Induction Generator (DFIG) is an important type of WG due to its robustness and versatility. Its accurate and efficient modeling is very important in distribution systems planning and analysis studies, as the older approximate representation method (the constant PQ model) is no longer sufficient given the scale of integration of WGs. This thesis proposes a new three-phase model for the DFIG, compatible with unbalanced three-phase distribution systems, by deriving an analytical representation of its three major components, namely the wind turbine, the voltage source converter, and the wound-rotor induction machine. The proposed model has a set of nonlinear equations that yields the total three-phase active and reactive powers injected into the grid by the DFIG as a function of the grid voltage and wind turbine parameters. This proposed model is integrated with a three-phased unbalanced power flow method and reported in this thesis. The proposed method opens up a new way to conduct power flow studies on unbalanced distribution systems with WGs. The proposed DFIG model is verified using Matlab-Simulink. IEEE 37-bus test system data from the IEEE Distribution System sub-committee is used to benchmark the results of the power flow method.

scholarly journals Demand Re-Allocation in Conjunction with Feeder Input Power using Iterative Power Flows Method

2019 ◽  
Vol 8 (4) ◽  
pp. 10436-10445
Keyword(s):  
Radial Distribution ◽  
Distribution System ◽  
Power Flow ◽  
Distribution Systems ◽  
Power Input ◽  
Input Power ◽  
Flow Method ◽  
Allocation Process ◽  
Complex Power ◽  
Power Flow Method

The aim of this paper is to introduce the demand re-allocation process (demand estimation) in conjunction with feeder input complex power for Unbalanced Radial Distribution System (URDS) with mutual impedances using Iterative Power Flows (IPFS) method. The proposed method in this paper is to compute the individual loads on each phase in conjunction with the feeder telemetered complex power input and with the help of backward forward sweep power flow method calculate iteratively nodal voltages and total losses per phase on the feeder. The practical 8 bus and 55 bus unbalanced radial distribution systems with mutual impedances are used to describe the novelty of the proposed algorithm. The simulation results in terms of new individual demands, bus voltages and total per phase losses are summarized. The bus voltages with iterative power flows method are compared with direct approach power flow method results.

scholarly journals Accurate and Efficient Derivative-Free Three-Phase Power Flow Method for Unbalanced Distribution Networks

Computation ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 61
Author(s):  
Oscar Danilo Montoya ◽  
Juan S. Giraldo ◽  
Luis Fernando Grisales-Noreña ◽  
Harold R. Chamorro ◽  
Lazaro Alvarado-Barrios
Keyword(s):  
Power Flow ◽  
Triangular Matrix ◽  
Distribution Networks ◽  
Flow Method ◽  
Processing Times ◽  
Three Phase ◽  
Derivative Free ◽  
Upper Triangular Matrix ◽  
Power Flow Problem ◽  
Power Flow Method

The power flow problem in three-phase unbalanced distribution networks is addressed in this research using a derivative-free numerical method based on the upper-triangular matrix. The upper-triangular matrix is obtained from the topological connection among nodes of the network (i.e., through a graph-based method). The main advantage of the proposed three-phase power flow method is the possibility of working with single-, two-, and three-phase loads, including Δ- and Y-connections. The Banach fixed-point theorem for loads with Y-connection helps ensure the convergence of the upper-triangular power flow method based an impedance-like equivalent matrix. Numerical results in three-phase systems with 8, 25, and 37 nodes demonstrate the effectiveness and computational efficiency of the proposed three-phase power flow formulation compared to the classical three-phase backward/forward method and the implementation of the power flow problem in the DigSILENT software. Comparisons with the backward/forward method demonstrate that the proposed approach is 47.01%, 47.98%, and 36.96% faster in terms of processing times by employing the same number of iterations as when evaluated in the 8-, 25-, and 37-bus systems, respectively. An application of the Chu-Beasley genetic algorithm using a leader–follower optimization approach is applied to the phase-balancing problem utilizing the proposed power flow in the follower stage. Numerical results present optimal solutions with processing times lower than 5 s, which confirms its applicability in large-scale optimization problems employing embedding master–slave optimization structures.

scholarly journals A Graph-Based Power Flow Method for Balanced Distribution Systems

Energies ◽  
2018 ◽  
Vol 11 (3) ◽  
pp. 511 ◽  
Author(s):  
Tao Shen ◽  
Yanjun Li ◽  
Ji Xiang
Keyword(s):  
Power Flow ◽  
Distribution Systems ◽  
Flow Method ◽  
Balanced Distribution ◽  
Power Flow Method
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