1. Performance Comparison of VSC-Based Shunt and Series Compensators Used for Load Voltage Control in Distribution Systems
- Author
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Arindam Ghosh, Rajesh Gupta, and Avinash Joshi
- Subjects
Engineering ,Frequency response ,Total harmonic distortion ,Load voltage control ,Nonlinear load ,Emtp ,business.industry ,Energy Engineering and Power Technology ,Voltage regulator ,Distribution static compensator (DSTATCOM) ,law.invention ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,Multilevel inverter ,law ,Control theory ,Frequency-response characteristic ,Electrical network ,Power electronics ,Electronic engineering ,Voltage regulation ,Electrical and Electronic Engineering ,business ,Dynamic voltage restorer (DVR) ,Voltage - Abstract
In this paper, the performance of voltage-source converter-based shunt and series compensators used for load voltage control in electrical power distribution systems has been analyzed and compared, when a nonlinear load is connected across the load bus. The comparison has been made based on the closed-loop frequency resopnse characteristics of the compensated distribution system. A distribution static compensator (DSTATCOM) as a shunt device and a dynamic voltage restorer (DVR) as a series device are considered in the voltage-control mode for the comparison. The power-quality problems which these compensator address include voltage sags/swells, load voltage harmonic distortions, and unbalancing. The effect of various system parameters on the control performance of the compensator can be studied using the proposed analysis. In particular, the performance of the two compensators are compared with the strong ac supply (stiff source) and weak ac-supply (non-still source) distribution system. The experimental verification of the analytical results derived has been obtained using a laboratory model of the single-phase DSTATCOM and DVR. A generalized converter topology using a cascaded multilevel inverter has been proposed for the medium-voltage distribution system. Simulation studies have been performed in the PSCAD/EMTDC software to verify the results in the three-phase system.
- Published
- 2011