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Related Concept Videos

The Power Flow Problem and Solution01:26

The Power Flow Problem and Solution

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Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk​, phase angle δk​, real power Pk​, and reactive power Qk​. Two of these four variables are inputs, while the...
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Fast Decoupled and DC Powerflow01:24

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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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There are several methods to control power flow in power systems:
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Maximum Power Flow and Line Loadability01:23

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The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
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The Delta-to-Delta Circuit01:17

The Delta-to-Delta Circuit

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In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
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Power in a Three-Phase Circuit01:15

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Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...
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Derivative-Free Power Flow Solution for Bipolar DC Networks with Multiple Constant Power Terminals.

Ángeles Medina-Quesada1, Oscar Danilo Montoya2,3, Jesus C Hernández1

  • 1Department of Electrical Engineering, University of Jaén, Campus Lagunillas s/n, Edificio A3, 23071 Jaén, Spain.

Sensors (Basel, Switzerland)
|April 23, 2022
PubMed
Summary
This summary is machine-generated.

This study examines power flow in bipolar direct current (DC) networks with ungrounded neutral poles. Results show significant voltage imbalances and power loss variations based on grounding configurations.

Keywords:
bipolar DC networksconvergence evaluationmonopolar and bipolar constant power loadspower flow solutiontriangular-based formulation

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Area of Science:

  • Electrical Engineering
  • Power Systems Analysis
  • Direct Current (DC) Networks

Background:

  • Bipolar DC networks with radial structures are increasingly used.
  • Non-grounded reference poles in these networks lead to neutral currents and voltage imbalances.
  • Accurate power flow solutions are crucial for stable operation.

Purpose of the Study:

  • To analyze the power flow solution in bipolar DC networks with radial structures.
  • To investigate the impact of multiple monopolar and bipolar constant power loads.
  • To evaluate the effect of the neutral cable's grounding on voltage profiles and power losses.

Main Methods:

  • Formulation of the power flow problem using a triangular-based representation of grid topology.
  • Development of a recursive formulation for iterative voltage determination at demand nodes.
  • Testing the linear convergence of the triangular-based power flow method under various load conditions.

Main Results:

  • The triangular-based method demonstrates linear convergence for power flow solutions.
  • Numerical results on 21- and 85-bus grids show significant variations in voltage profiles.
  • Total grid power losses are notably affected by whether the neutral cable is solidly grounded or not.

Conclusions:

  • The proposed power flow method is effective for analyzing bipolar DC networks.
  • Ungrounded neutral configurations in bipolar DC grids introduce significant voltage imbalances.
  • Grounding strategy for the neutral cable is a critical factor influencing power system efficiency and stability.