Shrirang Abhyankar

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This paper presents a novel implicitly-coupled solution approach for the combined electromechanical and electromagnetic transients simulation. Unlike the existing hybrid simulators that use an explicit approach to interface separate transient stability (TS) and electromagnetic transients (EMT) programs, the authors propose combining the equations of the two(More)
Developing scalable software for existing and emerging power system problems is a challenging task and requires considerable time and effort. This effort can be reduced by using high performance software libraries, such as PETSc, which are tested on a gamut of scientific applications, used on single-core machines to supercomputers, have highly optimized(More)
This paper discusses the development of a parallel three-phase transient stability simulator that is built using the high performance computing library PETSc. Unlike the existing transient stability simulators that use a balanced per phase transmission network, the authors use a three phase transmission network. This three phase representation allows a more(More)
We present a novel technique for determining the solution of optimal power flow, including dynamic security constraints, using forward sensitivities computed by using finite differences. Finite differencing provides an easy way of computing the sensitivities of the dynamic security constraints in optimal power flow. A dynamic security measure based on the(More)
Real-time dynamics simulation of large-scale power systems is a computational challenge because of the need to solve a large set of stiff, nonlinear differential-algebraic equations. The main bottleneck in these simulations is the solution of the linear system during each nonlinear iteration of Newton's method. We present a parallel linear solution scheme(More)
In this paper, we describe a parallel implementation of the implicitly coupled solution approach for combined electromechanical and electromagnetic transients simulation. In the proposed parallel-in-space-and-time scheme, the equations for transient stability (TS) are partitioned in space and the coupled-in-time electromagnetic transients equations (EMT)(More)
The computational bottleneck for large nonlinear AC power flow problems using Newton's method is the solution of the linear system at each iteration. We present a parallel linear solution scheme using the Krylov subspace-based iterative solver GMRES preconditioned with overlapping restricted additive Schwarz method (RASM) that shows promising speedup for(More)
A scientific framework for simulations of large-scale networks, such as is required for the analysis of critical infrastructure interaction and interdependencies, is needed for applications on exascale computers. Such a framework must be able to manage heterogeneous physics and unstructured topology, and must be reusable. To this end we have developed(More)