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52 lines
1.8 KiB
52 lines
1.8 KiB
.. _faq:
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Frequently Asked Questions
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General
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=======
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Q: What is the Hybrid Symbolic-Numeric Framework in ANDES?
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A: It is a modeling and simulation framework that uses symbolic computation for descriptive
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modeling and code generation for fast numerical simulation.
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The goal of the framework is to reduce the programming efforts associated with implementing
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complex models and automate the research workflow of modeling, simulation, and documentation.
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The framework reduces the modeling efforts from two aspects:
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(1) allowing modeling by typing in equations, and (2) allowing modeling using modularized
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control blocks and discontinuous components.
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One only needs to describe the model using equations and blocks without having to write the
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numerical code to implement the computation.
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The framework automatically generate symbolic expressions, computes partial derivatives,
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and generates vectorized numerical code.
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Modeling
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========
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Admittance matrix
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-----------------
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Q: Where to find the line admittance matrix?
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A: ANDES does not build line admittance matrix for computing
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line power injections. Instead, line power injections are
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computed as vectors on the two line terminal. This approach
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generalizes line as a power injection model.
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Q: Without admittance matrix, how to switch out lines?
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A: Lines can be switched out and in by using ``Toggler``.
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See the example in ``cases/kundur/kundur_full.xlsx``.
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One does not need to manually trigger a Jacobian matrix rebuild
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because ``Toggler`` automatically triggers it using the new
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connectivity status.
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Reference of the existing model
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-------------------------------
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Q: Is there any further reference of the existing model?
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A: Most of them can be found online, such as ESIG and PowerWorld.
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