Shrirang Abhyankar

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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)
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)
—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)
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)
—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(More)
The Laboratory's main facility is outside Chicago, at 9700 South Cass Avenue, Argonne, Illinois 60439. For information about Argonne and its pioneering science and technology programs, see Abstract Sensitivity analysis is an important tool to describe power system dynamic behavior in response to parameter variations. It is a central component(More)
—Sensitivity analysis is an important tool for describing power system dynamic behavior in response to parameter variations. It is a central component in preventive and corrective control applications. The existing approaches for sensitivity calculations , namely, finite-difference and forward sensitivity analysis, require a computational effort that(More)
We present a computational framework that facilitates the construction, instantia-tion, and analysis of large-scale optimization and simulation applications of coupled energy networks. The framework integrates the optimization modeling package PLASMO and the simulation package DMNetwork (built around PETSc). These tools use a common graph-based abstraction(More)
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