Research on Modify Proportion-Integration Control Strategy of Three-Phase Four-Leg Inverter

Abstract:

A general PI control algorithm is not a perfect solution to control ac signal. Because it is not able to eliminated steady-state error. The radical reason of the problem is investigated in few literatures. So the reason is explored, and an important conclusion is reached. The conclusion is that zero steady-state error control is obtained when the control algorithm has infinite gain at the excited frequency. Based on this conclusion, a modified PI algorithm is proposed for a four-leg inverter. The method that parameters of the modified PI algorithm are defined is given. To control the component in the 0 axis, the virtual component leading the component in the 0 axis by 90 degree is constructed. So the unified control algorithm is implemented in reference frame. The effectiveness of the proposed algorithm has been investigated and verified through simulation.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 7305-7311
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.7305
• Online since: January 2012
• Authors: Jing Yan Min, Hong Bing Chen
• Keywords: PI Algorithm Steady-Static Error, Three-Phase Four-Leg Inverter, Voltage Control

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