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Related Concept Videos

Multimachine Stability01:25

Multimachine Stability

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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
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Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

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The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
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Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

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The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
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Load-frequency control

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Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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Sequence Networks of Rotating Machines01:24

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A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
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Parallel RLC Circuits01:14

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Street lamps equipped with RLC surge protectors are an excellent example of applying circuit analysis in practical scenarios. These surge protectors safeguard the lamp's components against sudden voltage spikes.
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Modified LMS synchronization technique for distributed energy resources with DC-offset and harmonic elimination

Hemant Saxena1, Alka Singh2, Prakash Chittora2

  • 1SRM Institute of Science and Technology, Delhi-NCR Campus, Uttar Pradesh, India.

ISA Transactions
|October 17, 2022
PubMed
Summary

A novel Modified Least Mean Square Phase Locked Loop (MLMS-PLL) enhances grid synchronization for Shunt Active Power Filters. This technique effectively tracks phase angles under non-ideal grid conditions, improving power quality.

Keywords:
Adaptive algorithmDC-offsetPhase-locked loopsSynchronization

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Area of Science:

  • Electrical Engineering
  • Power Systems
  • Control Systems

Background:

  • Traditional Phase Locked Loop (PLL) synchronization techniques degrade under non-ideal grid conditions like frequency deviation and harmonics.
  • Shunt Active Power Filters (SAPF) require robust synchronization for effective power quality improvement in distribution systems.

Purpose of the Study:

  • To propose and validate a Modified Least Mean Square Phase Locked Loop (MLMS-PLL) for improved grid synchronization.
  • To enhance the performance of SAPFs under various non-ideal grid voltage conditions.

Main Methods:

  • Development of a novel MLMS-PLL algorithm for phase angle tracking.
  • Implementation of DC-offset estimation and synchronization template generation.
  • Extensive testing and experimental validation of the MLMS-PLL under simulated non-ideal grid scenarios.

Main Results:

  • The MLMS-PLL demonstrated superior performance in tracking phase angles under conditions including phase shift, frequency deviation, harmonics, and DC offset.
  • The proposed method achieved least steady-state error, faster dynamic response, and effective DC-offset rejection compared to conventional PLLs.
  • Experimental validation confirmed the MLMS-PLL's effectiveness in synchronization, reactive power compensation, and harmonic elimination for grid-tied PV systems.

Conclusions:

  • The MLMS-PLL offers a robust and effective solution for grid synchronization challenges in power distribution systems.
  • The proposed technique significantly improves power quality and system stability under adverse grid conditions.
  • The MLMS-PLL is a promising advancement for applications like grid-tied photovoltaic systems.