Voltage Feedforward Control with Time-Delay Compensation for Grid-Connected Converters

Shude Yang; Xiangqian Tong

Voltage Feedforward Control with Time-Delay Compensation for Grid-Connected Converters

Shude Yang

Xiangqian Tong

Vol. 16, No. 5, pp. 1833-1842, Sep. 2016

10.6113/JPE.2016.16.5.1833

Feedforward control

Grid-connected converter

Leading correction

time delay

Voltage distortion

PDF

Abstract

In grid-connected converter control, grid voltage feedforward is usually introduced to suppress the influence of grid voltage distortion on the converter’s grid-side AC current. However, owing to the time-delay in control systems, the suppression effect of the grid voltage distortion is seriously affected. In this paper, the positive effects of the grid voltage feedforward control are analyzed in detail, and the time-delay caused by the low-pass filter (LPF) in the voltage filtering circuits and digital control are summarized. In order to reduce the time-delay effect on the performance of the feedforward control, a voltage feedforward control strategy with time-delay compensation is proposed, in which, a leading correction of the feedforward voltage is used. The optimal leading step used in this strategy is derived from analyzing the phase-frequency characteristics of a LPF and the implementation of digital control. By using the optimal leading step, the delay in the feedforward path can be further counteracted so that the performance of the feedforward control in terms of suppressing the influence of grid voltage distortion on the converter output current can be improved. The validity of the proposed method is verified through simulation and experiment results.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

S. Yang and X. Tong, "Voltage Feedforward Control with Time-Delay Compensation for Grid-Connected Converters," Journal of Power Electronics, vol. 16, no. 5, pp. 1833-1842, 2016. DOI: 10.6113/JPE.2016.16.5.1833.

[ACM Style]

Shude Yang and Xiangqian Tong. 2016. Voltage Feedforward Control with Time-Delay Compensation for Grid-Connected Converters. Journal of Power Electronics, 16, 5, (2016), 1833-1842. DOI: 10.6113/JPE.2016.16.5.1833.