Efficient decoupled procedure for solving the load-flow problems during long-term dynamic processes in power systems

1987 ◽  
Vol 9 (3) ◽  
pp. 173-179 ◽  
Author(s):  
D.P. Popović
Keyword(s):  
Power Systems ◽  
Load Flow ◽  
Dynamic Processes ◽  
Flow Problems

scholarly journals A New and Efficient Nonlinear Solver for Load Flow Problems

2020 ◽  
Vol 10 (3) ◽  
pp. 5851-5856
Author(s):  
A. H. Khoso ◽  
M. M. Shaikh ◽  
A. A. Hashmani
Keyword(s):  
Power Systems ◽  
Electric Power Systems ◽  
Load Flow ◽  
Significant Issue ◽  
Order Accuracy ◽  
Flow Problems ◽  
Nonlinear Solver ◽  
Nonlinear Solvers ◽  
Simulation Results ◽  
Number Of Iterations

Load Flow (LF) analysis is a fundamental and significant issue in electric power systems. Because of the nonlinearity of the power mismatch equations, the accuracy of the nonlinear solvers is important. In this study, a novel and efficient nonlinear solver is proposed with active applications to LF problems. The formulation of the Proposed Method (PM) and its workflow and mathematical modeling for its application in LF problems have been discussed. The performance of the PM has been validated on the IEEE 14-bus and 30-bus test systems against several existing methods. The simulation results show that the PM exhibits higher order accuracy, faster convergence characteristics, smaller number of iterations, and lesser computation times in comparison with the other benchmark methods.

Operation Characteristics of Zone 3 Distance Protection in Wind Power Systems with Fixed-Speed Induction Generators

2011 ◽  
Vol 12 (4) ◽  
Author(s):  
Shenghu Li
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Reactive Power ◽  
Flow Analysis ◽  
Load Flow ◽  
Synchronous Generators ◽  
Induction Generators ◽  
Load Flow Analysis ◽  
Wind Power Systems ◽  
Operation Characteristics

The induction generators (IGs) are basic to wind energy conversion. They produce the active power and consume the reactive power, with the voltage characteristics fragile compared with that of the synchronous generators and doubly-fed IGs. In the stressed system states, they may intensify var imbalance, yielding undesirable operation of zone 3 impedance relays.In this paper, the operation characteristics of the zone 3 relays in the wind power systems is studied. With the theoretical and load flow analysis, it is proved that the equivalent impedance of the IGs lies in the 2nd quadrature, possibly seen as the backward faults by the mho relays, i.e. the apparent impedance enters into the protection region from the left side. The undesirable operation may be caused by more wind power, larger load, less var compensation, and larger torque angle.

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