Parameter Optimization of Virtual Impedance for Parallel Inverter

Abstract:

This paper deals with parameter optimization of virtual impedance of parallel inverter. Conventional design methods determine parameters by observing the changes of amplitude-frequency and phase frequency curves of the equivalent impedance. However, those methods always neglect the dynamic performance of inverters in parallel. This paper proposes a novel method to optimize the coefficients of virtual impedance and experiments show that new method improves the dynamic performance of parallel inverter effectively, as well as stability and flexibility.

• Periodical: Advanced Materials Research (Volumes 986-987)
• Pages: 1973-1976
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.986-987.1973
• Online since: July 2014
• Authors: Ping Wang*, Liu Yang
• Keywords: Dynamic Performance, Parameter Optimization, Virtual Impedance

References

[1] Tuladhar A, Jin H, Unger T, et al. Control of Parallel Inverters in Distributed AC Power Systems with Consideration of Line Impedance Effect[J]. IEEE Transaction on Industrial Applications, 2000, 36(1)：131-138.

DOI: 10.1109/28.821807

[2] Yan Li, Yun Wei Li, et al. Decoupled Power Control for an Inverter Based Low Voltage Microgrid in Autonomous Operation[C]/IEEE 6th International Power Electronics and Motion Control.

DOI: 10.1109/ipemc.2009.5157823

[3] Guerrero J M, de Vicuna L G, Matas J, et al. Output Impedance Design of Parallel-connected UPS Inverters with Wireless Load-sharing Control[J]．IEEE Transactions on Industrial Electronics, 2005, 52(4)：1126-1135.

DOI: 10.1109/tie.2005.851634

[4] Wei Yao, Min Chen, Matas J, et al. Design and Analysis of the Droop Control Method for Parallel Inverters Considering the Impact of the Complex Impedance on the Power Sharing[J]. IEEE Transactions on Industrial Electronics, 2011, 58(2)：576-587.

DOI: 10.1109/tie.2010.2046001

[5] Fang Tianzhi, Ruan Xinbo, Xiao Lan, et al. An improved distributed control strategy of parallel inverters[J]．Proceedings of the CSEE, 2008, 28(33)：30-36(in Chinese).

DOI: 10.1109/pesc.2008.4592497

[6] Zhang Yao, Ma Hao, Lei Biao, et al. Analysis of dynamic performance for parallel operation of inverters without wire interconnections[J]．Proceedings of the CSEE, 2009, 29(3)：42-48(in Chinese).

[7] Wang Chengshan Xiao Zhaoxia, Wang Shouxiang. Multiple feedback loop control scheme for inverters of the micro source in microgrids[J]. Transactions of China ElectrotechnicalSociety, 2009, 24(2)：100-107(in Chinese).