A Novel Dynamic Voltage Restorer with Outage Handling Capability Using Fuzzy Logic Controller

ABSTRACT:

This paper presents a novel dynamic voltage restorer (DVR) capable of handling deep sags including outage on a low voltage distribution system. The DVR recovers sags up to 10% of nominal voltage; otherwise, it will operate as an uninterruptible power supply (UPS). A transformer is connected in series with the load when restoring sags, and is reconfigured into parallel connection using switches when handling outages. The controller uses a Fuzzy Logic with 3 inputs to maintain the load voltage through d-q transformation. Preliminary results from laboratory tests are also presented in this paper.

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

Fig. 1. Block diagram of the proposed DVR

 

EXPECTED SIMULATION RESULTS:

(a) Grid Voltage

(b) Load Voltage

(c) Inverter Voltage

Figure 2. The grid, load and inverter voltages under 3-phase fault

Figure 3. Grid and load voltages during 1-phase to ground fault

 

CONCLUSION:

A dynamic voltage restorer using Fuzzy Logic controller was demonstrated to remedy sags and outage voltages. Phase jumps and unbalanced conditions due to single phase-to-ground fault can also be compensated by the DVR. In the event of outage, where the voltage drops below 10%, the DVR restore the voltage into the normal. Thus, the load voltage is unaffected by the disturbances including sags and outages.

 

REFERENCES:

  • T Wunderlin, P. Dahler, D. Amhof, and H. Gruning, “Power Supply quality improvement with a dynamic voltage restorer (DVR)”, proc of EMPD ’98, Mar 3-5.
  • Arora, K. Chan, T. Jauch, A. Kara, and E. Wirth,”Innovative system solutions for power quality enhancement”, ABB Review 3, 1998.
  • Campos and G Joos et al.,”Analysis and design of a series voltage unbalance compensator based on threephase VSI operating with unbalanced switching function”, IEEE Trans. On Power Electronics, vol. 9 no. 3, pp.269-274, May 1994.
  • Haddad and and G. Joos,”Distribution system voltage regulation under fault conditions using static series regulators”, proc of Annual Meeting IEEE Ind. Appl. Soc., 1997. pp. 1383-1389.
  • Ashari, M., C.V. Nayar and S. Islam, “Steady-State Performance of a Grid Interactive Voltage Source Inverter”, proceedings of IEEE PES Summer Meeting, 15-19 July 2001, Vancouver, BC Canada.

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