BPF-based Grid Voltage Feedforward Control of Grid-connected Converters for Improving Robust Stability

Shude Yang; Xiangqian Tong; Jun Yin; Haiyan Wang; Yaping Deng; Le Liu

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저자정보: Shude Yang (Xi’an University of Technology) Xiangqian Tong (Xi’an University of Technology) Jun Yin (Xi’an University of Technology) Haiyan Wang (Xi’an University of Technology) Yaping Deng (Xi’an University of Technology) Le Liu (Xi’an University of Technology)

저널정보: 전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.17 No.2

발행연도: 2017.3

수록면: 432 - 441 (10page)

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Grid voltage feedforward is extensively used for controlling grid-connected converters. However, the conventional voltage feedforward control reduces the stability margins of the converter connected to a high-impedance grid. The effect mechanism of voltage feedforward on the grid-connected converter control under high-inductive conditions of the grid impedance is clearly explained in this study using the equivalent transformations of control block diagrams. Results show that the delay produced by the digital control is the root cause of this effect. An improved voltage feedforward strategy, in which a bandpass filter (BPF) is introduced into the feedforward path, is proposed to strengthen the converter’s robust stability against grid impedance variations. The selection method of the BPF’s bandwidth is also provided considering the tradeoff between the response speed to the grid voltage sag and the system’s robust stability. The converter can work stably over a wide range of the grid impedance through the proposed approach. Simulation and experimental results fully verify the effectiveness of the BPF-based voltage feedforward strategy.

#Bandpass filter #Delay caused by digital control #Grid-connected converter #Grid impedance #Grid voltage feedforward #Robust stability

Abstract
I. INTRODUCTION
II. SYSTEM MODELING AND ANALYSIS OF THE EFFECT MECHANISM OF THE GRID VOLTAGE FEEDFORWARD ON THE CONTROL SYSTEM
III. ROBUST STABILITY ANALYSIS OF THE CONVENTIONAL GRID VOLTAGE FEEDFORWARD METHOD
IV. BPF-BASED GRID VOLTAGE FEEDFORWARD AND ITS ROBUST STABILITY ANALYSIS
V. SIMULATION AND EXPERIMENTAL RESULTS
VI. CONCLUSIONS
REFERENCES

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[학술지(정기간행물)] - M. Zabaleta / 2016 / LCL grid filter design of a multimegawatt medium-voltage converter for offshore wind turbine using SHEPWM modulation / IEEE Trans. Power Electron. 31 (3) : 1993 ~ 2001

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