Output Impedance Modeling of Single-Phase Grid-Tied Inverters With Capturing the Frequency-Coupling Effect of PLL

2020 ◽  
Vol 35 (5) ◽  
pp. 5479-5495 ◽  
Author(s):  
Qiang Qian ◽  
Shaojun Xie ◽  
Jinming Xu ◽  
Kunshan Xu ◽  
Shenyiyang Bian ◽  
...  
Keyword(s):  
Single Phase ◽  
Coupling Effect ◽  
Output Impedance ◽  
Impedance Modeling ◽  
Frequency Coupling

Input Impedance Modeling of Single-Phase Voltage Source Rectifier With Consideration of FrequencyCoupling Effect

2020 ◽  
Author(s):  
Jianheng Lin ◽  
Mei Su ◽  
Yao Sun ◽  
Shiming Xie
Keyword(s):  
Input Impedance ◽  
Single Phase ◽  
Coupling Effect ◽  
Voltage Source ◽  
Phase Voltage ◽  
Impedance Model ◽  
Grid Impedance ◽  
Impedance Modeling ◽  
Frequency Coupling ◽  
Time Periodicity

Time-periodicity and non-linearity pose a challenge to the precise input impedance modeling of single-phase power converters. In this study, a precise input impedance model with measurability of the single-phase voltage source rectifier (VSR), which considers the frequency-coupling effect (FCE), is established. Meanwhile, it is revealed that the rectifier input impedance is dependent of the grid impedance. In the proposed modeling approach, only Laplace transform and frequencyshifting operation are required, which avoids the complicated convolution calculation in the frequency domain. In addition, the influence of grid impedance on the input impedance is studied. Simulations are conducted to verify the effectiveness of the proposed method. <br>

scholarly journals Input Impedance Modeling of Single-Phase Voltage Source Rectifier With Consideration of FrequencyCoupling Effect

2020 ◽  
Author(s):  
Jianheng Lin ◽  
Mei Su ◽  
Yao Sun ◽  
Shiming Xie
Keyword(s):  
Input Impedance ◽  
Single Phase ◽  
Coupling Effect ◽  
Voltage Source ◽  
Phase Voltage ◽  
Impedance Model ◽  
Grid Impedance ◽  
Impedance Modeling ◽  
Frequency Coupling ◽  
Time Periodicity

Time-periodicity and non-linearity pose a challenge to the precise input impedance modeling of single-phase power converters. In this study, a precise input impedance model with measurability of the single-phase voltage source rectifier (VSR), which considers the frequency-coupling effect (FCE), is established. Meanwhile, it is revealed that the rectifier input impedance is dependent of the grid impedance. In the proposed modeling approach, only Laplace transform and frequencyshifting operation are required, which avoids the complicated convolution calculation in the frequency domain. In addition, the influence of grid impedance on the input impedance is studied. Simulations are conducted to verify the effectiveness of the proposed method. <br>

scholarly journals Impedance Modeling and Stability Analysis of DFIG-Based Wind Energy Conversion System Considering Frequency Coupling

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3243
Author(s):  
Shaojian Song ◽  
Peichen Guan ◽  
Bin Liu ◽  
Yimin Lu ◽  
HuiHwang Goh
Keyword(s):  
Stability Analysis ◽  
Coupling Effect ◽  
Impedance Model ◽  
Wind Energy Conversion ◽  
Proposed Model ◽  
New Type ◽  
Impedance Modeling ◽  
Frequency Coupling ◽  
Bus Voltage ◽  
Voltage Dynamics

Impedance-based stability analysis is an effective method for addressing a new type of SSO accidents that have occurred in recent years, especially those caused by the control interaction between a DFIG and the power grid. However, the existing impedance modeling of DFIGs is mostly focused on a single converter, such as the GSC or RSC, and the influence between the RSC and GSC, as well as the frequency coupling effect inside the converter are usually overlooked, reducing the accuracy of DFIG stability analysis. Hence, the entire impedance is proposed in this paper for the DFIG-based WECS, taking coupling factors into account (e.g., DC bus voltage dynamics, asymmetric current regulation in the dq frame, and PLL). Numerical calculations and HIL simulations on RT-Lab were used to validate the proposed model. The results indicate that the entire impedance model with frequency coupling is more accurate, and it is capable of accurately predicting the system’s possible resonance points.

Recursive SISO Impedance Modeling of Single-Phase Voltage Source Rectifiers

2021 ◽  
Author(s):  
Jianheng Lin
Keyword(s):  
Transfer Function ◽  
Single Phase ◽  
Analytical Form ◽  
Voltage Source ◽  
Phase Voltage ◽  
Modeling Framework ◽  
Single Input Single Output ◽  
Impedance Model ◽  
Impedance Modeling ◽  
Frequency Coupling

<p>This paper proposes a recursive single-input single-output (SISO) impedance modeling framework for single-phase voltage source rectifiers, which can greatly simplify both the modeling procedure and the resulting impedance model. During the modeling process, frequency-coupling effects are modeled by the reduced-order transfer function vector rather than the transfer function matrix, so the modeling complexity is reduced. Moreover, the recursive SISO impedance model has an analytical form. And the recursive SISO impedance model can characterize the frequency-coupling dynamics of arbitrary order with a low computation burden. Experiments validate the accuracy of the recursive SISO impedance modeling.<br></p>

scholarly journals Recursive SISO Impedance Modeling of Single-Phase Voltage Source Rectifiers

2021 ◽  
Author(s):  
Jianheng Lin
Keyword(s):  
Transfer Function ◽  
Single Phase ◽  
Analytical Form ◽  
Voltage Source ◽  
Phase Voltage ◽  
Modeling Framework ◽  
Single Input Single Output ◽  
Impedance Model ◽  
Impedance Modeling ◽  
Frequency Coupling

<p>This paper proposes a recursive single-input single-output (SISO) impedance modeling framework for single-phase voltage source rectifiers, which can greatly simplify both the modeling procedure and the resulting impedance model. During the modeling process, frequency-coupling effects are modeled by the reduced-order transfer function vector rather than the transfer function matrix, so the modeling complexity is reduced. Moreover, the recursive SISO impedance model has an analytical form. And the recursive SISO impedance model can characterize the frequency-coupling dynamics of arbitrary order with a low computation burden. Experiments validate the accuracy of the recursive SISO impedance modeling.<br></p>

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