A New Power Flow Method Solving DG Integrated Distribution System

2013 ◽  
Vol 380-384 ◽  
pp. 2977-2981
Author(s):  
Yue Feng Lu ◽  
Shao Hua Lin ◽  
Wei Zhou ◽  
Hai Tao Li
Keyword(s):  
Distribution System ◽  
Traditional Method ◽  
Power Flow ◽  
Flow Direction ◽  
Power Flow Calculation ◽  
Distributed Generations ◽  
Flow Method ◽  
Loop Topology ◽  
Decoupled Method ◽  
Power Flow Method

With the fast developing on distributed generations (DGs) integrating into distribution system, it changes power flow direction in tree-topology, as a result of which traditional power flow method is not effective for this new scene. It is necessary to make improvement on traditional method in order to accelerate the speed of power flow calculation. Since fast decoupled method is not suitable for system with a high R/X ratio, its need to make compensation for the branches to increase R/X ratio. DGs are integrated into power gird normally by inverter interfaced mode or direct grid-connected mode. In this paper, a new fast decoupled power flow method is proposed which could solve various DGs integrated into distribution network, as well as loop topology of distribution system. The utility of proposed method is tested by simulations of IEEE 69-bus system.

Decoupled AC/DC Power Flow Strategy for Multiterminal HVDC Systems

2018 ◽  
Vol 19 (1) ◽  
Author(s):  
Yixiang Gao ◽  
Shuhui Li ◽  
Weizhen Dong ◽  
Bing Lu
Keyword(s):  
Power Flow ◽  
Control Mode ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Power System Control ◽  
Flow Method ◽  
Hvdc System ◽  
Dc Power ◽  
Bus System ◽  
Power Flow Method

AbstractThis paper proposes a decoupled AC/DC power flow approach for multi-terminal HVDC systems. The proposed method simplifies the power flow computation of multi-terminal HVDC systems while accurately reflecting the operation and control characteristics of VSC (voltage source converter) stations in a HVDC network. In the DC network, the power flow calculation is conducted based on a slack DC bus VSC station and power commends issued to other VSC stations from the power system control center. Then, in the AC power flow calculation, VSC stations are treated as special AC generators that can generate and absorb power from the AC grid in active and reactive power or active power and bus voltage control mode. For validation purpose, the conventional unified power flow method for multi-terminal HVDC systems is built. The paper compares the proposed method with the unified power flow method for an 8-bus multi-terminal HVDC system based on MATPOWER. Then, more case studies for different VSC control modes are conducted and evaluated for the 8-bus system. Afterwards, the proposed method is applied to the power flow study of a more practical and complicated multi-terminal HVDC system based on the IEEE 118-bus system.

Contributions to the sequence-decoupling compensation power flow method for distribution system analysis

2019 ◽  
Vol 13 (5) ◽  
pp. 583-594 ◽  
Author(s):  
Thiago R. Fernandes ◽  
Tiago R. Ricciardi ◽  
Rafael S. da Silva ◽  
Madson C. de Almeida
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
System Analysis ◽  
Flow Method ◽  
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 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.

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