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Related Concept Videos

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Multiple Voltage Sources

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Generally, a single battery is not enough to power some devices. In such cases, batteries can be combined in two ways: in series or in parallel.
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Distributed Loads01:19

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Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
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Distributed Loads: Problem Solving01:21

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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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While designing structures exposed to non-uniform loads, it is crucial to consider the resultant force and its location. This resultant force is a single vector representing the net force applied due to the distributed load.
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Delay-tolerant distributed voltage control for multiple smart loads in AC microgrids.

Jingang Lai1, Xiaoqing Lu2, Ruo-Li Tang3

  • 1School of Engineering, RMIT University, Melbourne VIC 3001, Australia.

ISA Transactions
|November 10, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a robust distributed voltage control for smart microgrids using cooperative smart loads. The method ensures voltage stability despite communication delays, enhancing grid reliability with intermittent energy resources.

Keywords:
Communication delayConsensus protocolDistributed controlIslanded microgridSmart loadVoltage regulation

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Area of Science:

  • Electrical Engineering
  • Control Systems
  • Power Systems

Background:

  • Increasing integration of variable loads and intermittent distributed energy resources (DERs) in microgrids leads to voltage instability due to reduced inertia.
  • Smart grids require advanced control strategies to maintain stability with high DER penetration.
  • Inverter-based smart loads offer a potential solution for stability support in distribution grids.

Purpose of the Study:

  • To present a delay-tolerant distributed voltage control scheme for cooperative smart loads in AC microgrids.
  • To enhance the robustness of microgrid voltage stability against communication delays.
  • To ensure plug-and-play functionality for smart microgrids.

Main Methods:

  • A consensus protocol-based distributed voltage control scheme is proposed for multiple cooperative smart loads.
  • Lyapunov-Krasovskii functions are used to analyze system stability and derive delay-independent stability conditions.
  • Sensitivity analysis is performed to evaluate the impact of time delays on system dynamics.
  • A sparse communication network is employed for implementing the distributed control protocols.

Main Results:

  • The proposed scheme synchronizes the output voltage of each smart load to its reference value, ensuring stability.
  • Delay-independent stability conditions are derived, allowing for significant communication delays.
  • The control methodology demonstrates robustness against transmission communication delays.
  • Simulation results validate the effectiveness of the proposed control strategy in an AC microgrid.

Conclusions:

  • The developed distributed voltage control scheme effectively enhances microgrid stability in the presence of communication delays.
  • The approach supports the integration of intermittent DERs and variable loads by maintaining voltage stability.
  • The plug-and-play capability and robustness make the proposed scheme suitable for modern smart microgrids.