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Tuesday, 4 July 2017

Analysis and Control of  DSTATCOM for a Line Voltage Regulation

This paper describes a modeling and AC voltage direct control techniques of distribution static synchronous compensator (DSTATCOM) using EMTDC/PSCAD package. Moreover it is presented to make model of three-phase four-wire real distribution system and applied to model of DSTATCOM using EMTDC. Using AC voltage direct control, low harmonics and offset in the voltage as well as fast dynamic responses are achieved. The derived simulations are tried to verify the result of this paper.

1.      Distribution System
2.      Power Quality
3.      Custom Power Device
4.      Shunt Compensation Device
5.      Distribution Static Compensator (DSTATCOM)
6.       Voltage Sag, Harmonics
7.       Zero sequence



Fig.1. Schematic of distribution system

Fig.2. Load voltages at the sensitive load terminal [kV](EMTDC/PSCAD simulation )

Fig.3. Harmonics components at the sensitive load terminal

Fig.4. Bode-plot to demonstrate the stability of control of DSTATCOM

Fig.5. Voltage waveform of each phase using proposed DSTATCOM Control scheme

Figure 6. Harmonics of the load terminal using proposed control scheme

In this paper, typical distribution system was modeled using EMTDC/PSCAD simulation package. And the single-phase-to-ground fault in distribution system was simulated and analyzed. In the simulation, the component of harmonics in distribution system was analyzed. Also, in this paper, the AC voltage direct control scheme to eliminate sag-voltage and harmonics was proposed and simulated of DSTATCOM. Further work will improve of control scheme of DSTATCOM and application of real distribution system to examine their effective and robustness.

[1]   John S. Hsu, "Instantaneous Phasor Method for Obtaining Instantaneous Balanced Fundamental Components for Power Quality Control and Continuous Diagnostics," IEEE Transactions on Power Delivery, Vol.13, No.4, October 1998, pp.1494-1500
[2]    Johan H.R. and Enslin, "Unified Approach to Power Quality Mitigation," Industrial Electronics, Proceedings. ISIE '98. IEEE International Symposium on Volume: 1, pp.820
[3]   Gregory F. Reed, Masatoshi Takeda, "Improved power quality solutions using advanced solid-state switching and static compensation technologies," Power Engineering Society 1999 Winter Meeting, IEEE
[4]    Boon Teck Ooi, Joos, G, Xiaogang Huang, "Operating Principles of Shunt STATCOM Based On 3-Level Diode-clamped Converters," Power Engineering Society 1999 Winter Meeting, IEEE

[5]    Seung-gun Song, "The Technology for Distribution System Protection ," Korea Electric Power Company, 1995, pp.233 -335