D-STATCOM Model for Restoration of Distribution System Stability

Abstract

Due to complexity of electrical power system network, the assurance of uninterrupted supply of electricity and quality power has become the main challenge for the distribution system. The fluctuation of system voltage, frequency as well as real and reactive power hampers the system stability which jeopardizes uninterrupted supply of electricity to the consumers. Utility distribution networks, sensitivity industrial loads and critical commercial operations suffer from various types of outages and service interruptions which can cost significant financial losses. The voltage sag and swell are the most important power quality problems which are seen in industrial and commercial installations. For improving power quality at the distribution network, various FACTS (flexible AC transmission system) devices like D-STATCOM (dynamic static synchronous compensator), DVR (dynamic voltage restorer), SVC (static VAR compensator) and others are used. The D-STATCOM (distribution static compensator) is now replacing other FACTS devices in the distribution system for its better performance than others. The D-STATCOM has the capability of instantaneous system voltage improvement in case of voltage sag and flicker within the distribution system. The design of the control system is the main aspect of the D-STATCOM. In this paper, a 6 pulse D-STATCOM model is designed and simulated by using PSCAD/EMTDC for improving of distribution system stability by mitigation of voltage dips. The PI controller is used for controlling the voltage and reactive power flow to and from the DC capacitor of the D-STATCOM. The PLL (phase locked loop) is used for controlling the gate triggering pulses of IGBT based VSC (voltage source converter) of the D-STATCOM by using PWM (pulse width modulation)

Keywords

• Voltage dip
• Power quality
• FACTS
• D-STATCOM
• PSCAD/EMTDC

How to cite

Rajib Baran Roy, Md. Habibur Rahman (2016). D-STATCOM Model for Restoration of Distribution System Stability. Sonargaon University Journal, 1(1), 47–59.

@article{roy20163,
  title   = {D-STATCOM Model for Restoration of Distribution System Stability},
  author  = {Rajib Baran Roy and Md. Habibur Rahman},
  journal = {Sonargaon University Journal},
  volume  = {1},
  number  = {1},
  pages   = {47--59},
  year    = {2016},
  issn    = {2518-3125},
  url     = {https://su.edu.bd/journal/volume-1-number-1/d-statcom-model-for-restoration-of-distribution-system-stability}
}