New Configuration of a DVR based on Seven-Level Packed U-Cell Inverter to Improve Power Quality in Electrical Distribution Grids
Abstract
This paper proposes the mitigation of grid voltage disturbances using a 7-level Packed U Cells (PUC7) based dynamic
voltage restorer (DVR) solution. Which regulates the injection of the compensation voltage in series and synchronism with the grid during the voltage disturbance events, the auxiliary capacitor voltage, while controlling the PUC7 output current. A Seven-Level Packed U Cells (PUC7) inverter is composed of a smaller number of IGBTs and circuitry compared to similar structures. A voltage balancing controller is designed to apply the seven levels of the inverter; this is done by regulate the output voltage of the DC capacitors to a desired value in order to obtain seven levels at the output of the inverter. This feature enables the structure to be used to compensate for the power quality of power distribution networks. Nearest Level Control (NLC) in the inverter is used to create the desired waveform. The In-Phase control method is selected to control the proposed DVR and use the synchronous reference frame (SRF) method to detect the network voltage fluctuations. To verify and validate the proposed DVR performance, simulations are carried out in the MATLAB / SIMULINK software environment, and the results indicate the optimal performance and desirability of the proposed DVR to compensate for the voltage sag, swell and flicker power distribution grids. Theoretical analysis and simulation results are given to show the high performance of the proposed solution
References
[2] E. Akbari, A. Sheikholeslami and j. Rouhi, "operation DVR based Modular Multilevel Cascade Converter based on Double-star Chopper-cells (MMCC-DSCC) for Compensation Voltage sag and swell in Power Distribution Grids, Majlesi Journal of Mechatronic Systems (MJMS), Vol. 4, NO. 1, pp. 39-47, March 2015.
[3] A. Elnady and M. Salama, “Duall Role CDSC based Dual Vector Control for Effective Operation of DVR with Harmonic Mitigation” IEEE Transactions on Industrial Electronics, Vol. 16, No. 8, pp. 2614-2625, Nov 2018.
[4] H. Vahedi and K. Al-Haddad, “Real-Time Implementation of a Seven-Level Packed U-cell Inverter a Low-Switching-Ferquency voltage Regulator” IEEE Trans. Power Electron, Vol. 31, No. 8, pp. 5967-5973, Aug 2016.
[5] K. Gupta and A. Ranjan, “Multilevel inverter topologies with reduced device count a review” IEEE Trans. Power Electron, Vol. 31, No. 1, pp. 234-247, July2017.
[6] Y. Ounejjar and K. Al-Haddad, “Packed U-cell Multilevel Converter Topology: Theoretical Study and Expermental Validation” IEEE Trans. Ind. Electron, Vol. 58, No. 4, pp. 3421-3432, April 2011.
[7] A. M. Rauf and V. Khadkikar, "An Enhanced Voltage Sag Compensation Scheme for Dynamic Voltage Restorer," IEEE Transactions on Industrial Electronics, vol. 62, no. 5, pp. 2683-2692, May 2015.
[8] Y. Liu, and F. Luo “Trinary hybrid 81-level multilevel inverter for motor drive with zero common-mode voltage” IEEE Trans. Power Electron, Vol. 30, No. 1, pp. 450-462, Aug 2008.
[9] P. M. Meshram, V. B. Borghate and F. Nugater “A simplified nearest level control (NLC) voltage balancing method for modular multilevel converter (MMC)” IEEE Trans. Power Electron, Vol. 30, No. 1, pp. 450-462, Aug 2017.
[10] P. Jayaprakash, and K. Al-Haddad, "Control of reduced-rating Dynamic Voltage Restorer with a battery energy storage system," IEEE Transactions on Industry Application, vol. 50, no. 2, pp. 1295-1303, Mar 2014.
