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  2. Power-flow study - Wikipedia

    en.wikipedia.org/wiki/Power-flow_study

    In power engineering, the power-flow study, or load-flow study, is a numerical analysis of the flow of electric power in an interconnected system. A power-flow study usually uses simplified notations such as a one-line diagram and per-unit system, and focuses on various aspects of AC power parameters, such as voltages, voltage angles, real power and reactive power.

  3. Holomorphic Embedding Load-flow method - Wikipedia

    en.wikipedia.org/wiki/Holomorphic_embedding_Load...

    The Holomorphic Embedding Load-flow Method (HELM) [note 1] is a solution method for the power-flow equations of electrical power systems. Its main features are that it is direct (that is, non-iterative) and that it mathematically guarantees a consistent selection of the correct operative branch of the multivalued problem, also signalling the condition of voltage collapse when there is no solution.

  4. Unit commitment problem in electrical power production

    en.wikipedia.org/wiki/Unit_Commitment_Problem_in...

    generation is distributed across a vast geographical area (e.g., a country), and therefore the response of the electrical grid, itself a highly complex system, has to be taken into account: even if the production levels of all units are known, checking whether the load can be sustained and what the losses are requires highly complex power flow ...

  5. Nodal admittance matrix - Wikipedia

    en.wikipedia.org/wiki/Nodal_admittance_matrix

    The nodal admittance matrix of a power system is a form of Laplacian matrix of the nodal admittance diagram of the power system, which is derived by the application of Kirchhoff's laws to the admittance diagram of the power system.

  6. Slack bus - Wikipedia

    en.wikipedia.org/wiki/Slack_bus

    The slack bus is crucial to a load flow problem since it will account for transmission line losses. In a load flow problem, conservation of energy results in the total generation equaling to the sum of the loads. However, there still would be a discrepancy in these quantities due to line losses, which are dependent on line current.

  7. Finite element method - Wikipedia

    en.wikipedia.org/wiki/Finite_element_method

    The following two problems demonstrate the finite element method. P1 is a one-dimensional problem : {″ = (,), = =, where is given, is an unknown function of , and ″ is the second derivative of with respect to .

  8. Would a government shutdown affect mail delivery? What to know

    www.aol.com/news/government-shutdown-affect-mail...

    With a potential government shutdown looming ahead of the holidays, here's what you need to know if mail services will be impacted by it.

  9. Multi-commodity flow problem - Wikipedia

    en.wikipedia.org/wiki/Multi-commodity_flow_problem

    The minimum cost variant of the multi-commodity flow problem is a generalization of the minimum cost flow problem (in which there is merely one source and one sink ). Variants of the circulation problem are generalizations of all flow problems. That is, any flow problem can be viewed as a particular circulation problem.