Compensation of Voltage Harmonics for LCL-filtered Inverters in Islanded Microgrids

R. Ghanizadeh, M. Ebadian and G. B. Gharehpetian




In a microgrid (MG), it is possible to have some sensitive loads that require high voltage quality. In this paper, a new technique is proposed for selective compensation of main voltage harmonics in islanded MGs. The proposed technique is capable of adjusting the compensation percentage in proportion with the existing disturbance in the sensitive load bus (SLB) and sharing the compensation workload among DGs in proportion with their nominal power. This compensation, is performed by controlling of the interface inverters of distributed generation (DG) units with LCL filters. Also, to decrease the asymmetry among phase impedances of MG and mitigate the voltage distortion after the output LCL of filters, a novel structure is proposed to generate selective virtual impedance. At fundamental frequency, the proposed structure of the virtual impedance improves the control of the fundamental component. On the ather hand, at main harmonic frequencies, it tries to adaptively improve nonlinear load sharing among DG units and mitigate the voltage distortion after the output LCL filters. Simulation results in MATLAB/SIMULINK environment show the efficiency of the proposed approach in improving load load sharing and decreasing voltage harmonics.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 15)
Pages: 847-853 Date of Publication: 2017/04/25
ISSN: 2172-038X Date of Current Version:

REF: 493-17

Issue Date: April 2017
DOI:10.24084/repqj15.493 Publisher: EA4EPQ

Authors and affiliations

R. Ghanizadeh(1), M. Ebadian(1) and G. B. Gharehpetian(2)
1. Department of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
2. Electrical Engineering Department, Amirkabir University of Technology, Tehran, Iran

Key word

Distributed generation, Microgrid, Load sharing, Voltage harmonics compensation.


[1] IEEE Standard 1547.4-2011, "IEEE Guide for Design, Operation, and Integration of Distributed Resource Island Systems with Electric power systems", 2011.
[2] R. C. Dugan, M. F. McGranaghan, S. Santoso, H. W. Beaty, Electrical Power Systems Quality, (2nded), new York: McGraw- Hill, 2003.
[3] J. C. Vasquez, J. M. Guerrero, M. Savaghebi, E. G. Carrasco, and R. Teodorescu, "Modeling, analysis, and design of stationary reference frame droop controlledparallel three-phase voltage source inverters." IEEE Transaction on Industrial Electronics, vol. 60, no. 4, pp. 1271-1280, 2013.
[4] J. M. Guerrero, J. Matas, L. G. de Vicuña, M. Castilla, and J. Miret, "Decentralized Control for Parallel Operation of Distributed Generation Inverters Using Resistive Output Impedance", IEEE Transaction on Industrial Electronics,vol. 54, no. 2, pp. 994-1004, 2007.
[5] P. Sreekumar, V. Khadkikar, "A New Virtual Harmonic Impedance Scheme for Harmonic Power Sharing in an Islanded Microgrid", IEEE Transaction on Power Delivery, vol. PP, no. 99, pp. 1-10, 2015.
[6] M. Guerrero, J. Matas, L. G. Vicuna, M. Castilla, J. Miret, " Wireless control strategy for parallel operation of distributed generation inverters," IEEE Transaction on Industrial Electronics, vol. 53, no. 5, pp. 1461-1470, 2006.
[7] D. De and V. Ramanarayanan, "Decentralized Parallel Operation of Inverters Sharing Unbalanced and Nonlinear Loads", IEEE Transaction on Power Electronics,vol. 25, no. 12, pp. 3015- 3025, 2010.
[8] M. Savaghebi, J. C. Vesquez, A. Jalilian, J. M. Guerrero, T. L. Lee, "Selective compensation of Voltage harmonics in grid-connected microgrids," International Journal of Mathematics and Computers in Simulation,vol. 91, no. 6, pp. 211-228. 2013.
[9] M. Cirrincione, M. Pucci, G. Vitale, "A Single-Phase DG Generation Unit With Shunt Active Power Filter Capability by Adaptive Neural Filtering", IEEE Transaction on Industrial Electronics, vol. 55, no. 5, pp. 2093-2110, 2008.
[10] M. Prodanovic, K. D. Brabandere, J. V. Keybus, T. C. Green, J. Driesen, "Harmonic and Reactive Power Compensation as Ancillary Services in Inverter-Based Distributed Generation", IET Generation, Transmission and Distribution, vol. 1, no. 3, pp. 432-438, 2007.
[11] J. He, Y. W. Li, M. S. Munir, "A Flexible Harmonic Control Approach through Voltage Controlled DG-Grid Interfacing Converters", IEEE Transaction on Industrial Electronics, vol. 59, no. 1, pp. 444-455, 2012.
[12] X. Wang, F. Blaabjerg, Z. Chen, "Autonomous Control of Inverter-Interfaced Distributed Generation Units for Harmonic current filtering and resonance Damping in an islanded Microgrid," IEEE Transaction on Industry Applications, vol. 50, no. 1, pp. 452-461, 2014.
[13] T. L. Lee, P. T. Cheng, "Design of New Cooperative Harmonic Filtering Strategy for Distributed Generation Interface Converters in an Islanding Network", IEEE Transaction on Power Electronics, vol. 22, no. 5, pp. 1919-1927, 2007.
[14] M. Savaghebi, J. M. Guerrero, A. Jalilian, J. C. Vasquez, and Tzung-Lin Lee, "Hierarchical Control Scheme for Voltage Harmonics Compensation in an Islanded Droop-Controlled Microgrid," IEEE Power Electronic and Drive Systems, (PEDS), pp. 89-94, 2011.
[15] M. M. Hashempour, M. Savaghebi, J. C. Vasquez; J. M. Guerrero, "A Control Architecture to Coordinate Distributed Generators and Active Power Filters Coexisting i n a Microgrid", IEEE Transaction on Smart Grid, vol. PP, no. 99, pp. 1-12, 2015.
[16] S. Anwar , A. Elrayyah, Y. Sozer, "Efficient Single Phase Harmonics Elimination Method for Microgrid Operations", IEEE Transaction on Industry Applications, vol. 51, no. 4, pp. 3394-3403, 2015.
[17] J. M. Guerrero, M. Chandorkar, T. L. Lee, P. C. Loh, "Advanced Control Architectures for Intelligent Microgrids - Part II: Power Quality, Energy Storage, and AC/DC Microgrids," IEEE Transaction on Industrial Electronics, vol. 60, no. 4, pp. 1263-1270, 2013.
[18] J. M. Guerrero, J. C. Vasquez, J. Matas, L. G. de Vicuna, M. Castilla, "Hierarchical Control of Droop-Controlled AC and DC Microgrids- a General Approach Toward Standardization", IEEE Transaction on Industrial Electronics, vol. 58, no. 1, pp. 158-172, 2011.
[19] R. Ghanizadeh, M. Ebadian, G. B. Gharehpetian, "Control of Inverter-Interfaced Distributed Generation Units for Voltage and Current Harmonics Compensation in Grid-Connected Microgrids", Journal of Operation and Automation in Power Engineering, vol. 4, no. 1, pp. 66-82. 2016.
[20] IEEE Standard 1459-2010, IEEE Standard Definitions for the Measurement of Electric Power Quantities Under Sinusoidal, Nonsinusoidal, Balanced or Unbalanced Conditions, 2010.