“20th PSCC 2018 papers submission and review platform

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Robust Convergence of Power Flow using Tx Stepping Method with Equivalent Circuit Formulation

Robust solving of critical large power flow cases (with 50k or greater buses) forms the backbone of planning and operation of any large connected power grid. At present, reliable convergence for existing power flow tools for the large power flow cases is contingent upon a good initial guess for the system state. However, for the purposes of planning and operation of the power system, which can include analyzing extreme case scenarios, a good initial guess often does not exist. To enable robust convergence for large scale systems starting with an arbitrary initial guess, we extend our equivalent circuit formulation for power system analysis to include a novel continuation method based on transmission line (Tx) impedance stepping. While various continuation methods have been proposed for use with traditional ‘PQV’ power flow formulation, these methods have either failed to completely solve the problem or have resulted in convergence to a low voltage solution. The “Tx Stepping” method that is proposed in this paper will demonstrate robust convergence to the high voltage solution from an arbitrary initial guess. Example systems, including a 70k+ bus test case for the Eastern Interconnection of the US power grid, are solved from arbitrary initial guesses.

Author(s):

Amritanshu Pandey    
Carnegie Mellon University
United States

Marko Jereminov    
Carnegie Mellon University
United States

Martin Wagner    
Carnegie Mellon University
United States

Gabriela Hug    
ETHZurich
Switzerland

Larry Pileggi    
Carnegie Mellon University
United States

 

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