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Power-quality improvement using series FACTS

Power-quality improvement using series FACTS

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The chapter has developed simple modeling for the series FACTS (SSSC and IPFC) into NR-RCIM load flow method that can be used to analyze and improve the power quality. The developed models are based on current injection approach. In this modeling, the series controllers are represented as injected currents at the terminals of their impedances. These currents are calculated in terms of the specified power flow and buses voltage. The injected currents can easily be implemented in load-flow algorithm without any change in the Jacobian matrix. The parameters of series FACTS can be updated during the iterative process using simple equations based on their basic equivalent circuits. In these developed series controllers, the real and/or reactive power flow in single- or multiline transmission system can be controlled; the selection of appropriate initial values of FACTS devices is not required; the problem that happens when the series FACTS device is the only link between two areas has been solved; the structure of the admittance and Jacobian matrices has been kept without change. Consequentially, the complexity of load-flow algorithm with series FACTS has been reduced.

Chapter Contents:

  • 6.1 Introduction
  • 6.1.1 Electricity network and power-quality overview
  • 6.1.2 Load-flow analysis
  • 6.2 Power-quality improvement using FACTS devices
  • 6.3 Proposed SSSC model
  • 6.3.1 Case 1: PQ control
  • 6.3.2 Case 2: P control
  • 6.3.3 NR-RCIM load-flow method with developed SSSC model
  • 6.4 Proposed IPFC model
  • 6.4.1 Master line
  • 6.4.2 Slave line
  • 6.4.3 Incorporating of developed IPFC model in NR-RCIM load flow
  • 6.5 Validation of developed series FACTS models
  • 6.5.1 Proposed SSSC model in NR-RCIM
  • 6.5.2 Developed IPFC model in NR-RCIM
  • 6.6 Conclusions
  • References

Inspec keywords: power supply quality; Jacobian matrices; reactive power; load flow; iterative methods; flexible AC transmission systems; power transmission control

Other keywords: power quality improvement; Jacobian matrix; buses voltage; injected currents; equivalent circuits; series FACTS; impedance terminals; reactive power flow; current injection approach; single-line transmission system; NR-RCIM load flow; multiline transmission system; iterative process; series controllers

Subjects: Interpolation and function approximation (numerical analysis); Control of electric power systems; Interpolation and function approximation (numerical analysis); Linear algebra (numerical analysis); Power system control; a.c. transmission; Power supply quality and harmonics; Linear algebra (numerical analysis)

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