Stability Enhancement of Cascaded Power Converters Using Parallel Virtual Impedance Via Output Impedance Shaping of the Source Converter

2020 ◽  
Author(s):  
Haritha B ◽  
Tarakanath Kobaku ◽  
Mosaddique Nawaz Hussain ◽  
Vivek Agarwal
Keyword(s):  
Power Converters ◽  
Output Impedance ◽  
Stability Enhancement ◽  
Virtual Impedance

scholarly journals Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5253
Author(s):  
Chien-Chun Huang ◽  
Sheng-Li Yao ◽  
Huang-Jen Chiu
Keyword(s):  
Open Loop ◽  
Buck Converter ◽  
Output Impedance ◽  
Signal Model ◽  
Passive Components ◽  
The Past ◽  
Feedback Compensation ◽  
Series Systems ◽  
The Relationship ◽  
Virtual Impedance

In the past literature on virtual impedance to series systems, most of the discussion focused on stability without in-depth research on the system design of the series converter and the overall output impedance. Accordingly, this study takes an open-loop resonant LLC converter series-connected closed-loop Buck converter as an example. First, the conditions required for the direct connection of the small-signal model in the series, the effect of feedback compensation on the input impedance of the load stage, the operating frequency, and passive components of the two-stage converter are discussed in detail―the relationship between the matching and the output impedance. Afterwards, a mathematical model is used to discuss the effect of adding parallel virtual impedance on the output impedance of the overall series converter and then derive an optimized virtual impedance design. Finally, an experimental platform of 48 V to 12 V and maximum wattage of 96 W are implemented. The output impedance of the series converter is measured with an impedance analyzer to verify the theoretical analysis proposed in this paper.

scholarly journals Stability Enhancement Based on Virtual Impedance for DC Microgrids With Constant Power Loads

2015 ◽  
Vol 6 (6) ◽  
pp. 2770-2783 ◽  
Author(s):  
Xiaonan Lu ◽  
Kai Sun ◽  
Josep M. Guerrero ◽  
Juan C. Vasquez ◽  
Lipei Huang ◽  
...  
Keyword(s):  
Constant Power ◽  
Dc Microgrids ◽  
Constant Power Loads ◽  
Stability Enhancement ◽  
Virtual Impedance

scholarly journals The new power sharing method for threephase parallel inverters with nonlinear loads

2015 ◽  
Vol 18 (1) ◽  
pp. 16-28
Author(s):  
Phuong Minh Le ◽  
Dai Tan Le ◽  
Hoa Thi Xuan Pham
Keyword(s):  
Reactive Power ◽  
Energy System ◽  
Active Power ◽  
Power Sharing ◽  
Control Loop ◽  
Output Impedance ◽  
Nonlinear Loads ◽  
Control Scheme ◽  
Virtual Impedance

This paper presents a new method for controling parallel inverters to share active power and reactive power in the energy system with non-linear loads. In these systems, the virtual output impedance is usually added to the control loop of each inverter to improve the active power and reactive power sharing as well as the quality of the voltage system. Paper also proposes a kind of virtual impedance as a second-order general-integrator (SOGI) scheme. The simulation results in Matlab Simulink show the ability of the proposed controller to good share power P-Q, when connected with unbalanced and nonlinear loads. By using the proposed algorithm allows to reduce the voltage THD to 1.9% and 1.2% for unbalanced and nonlinear loads according by comparision with traditional control scheme.

Harmonic Suppression and Stability Enhancement for Parallel Multiple Grid-Connected Inverters Based on Passive Inverter Output Impedance

2017 ◽  
Vol 64 (9) ◽  
pp. 7587-7598 ◽  
Author(s):  
Qiang Qian ◽  
Shaojun Xie ◽  
Liuliu Huang ◽  
Jinming Xu ◽  
Zhao Zhang ◽  
...  
Keyword(s):  
Harmonic Suppression ◽  
Output Impedance ◽  
Stability Enhancement

Native AVP Control Method for Constant Output Impedance of DC Power Converters

2007 ◽  
Author(s):  
Jian Rong Huang ◽  
Sophia Chien-Hui Wang ◽  
Chia Jung Lee ◽  
Eddie Kuo-Lung Tseng ◽  
Dan Chen
Keyword(s):  
Power Converters ◽  
Control Method ◽  
Output Impedance ◽  
Dc Power ◽  
Constant Output

PRBS-based loop gain identification and output impedance shaping in DC microgrid power converters

2020 ◽  
Author(s):  
Aram Khodamoradi ◽  
Guangyuan Liu ◽  
Paolo Mattavelli ◽  
Tuomas Messo ◽  
Hossein Abedini
Keyword(s):  
Power Converters ◽  
Loop Gain ◽  
Output Impedance ◽  
Dc Microgrid

The Application of Capacitive Output Impedance of Inverter in Wind Farms

2013 ◽  
Vol 846-847 ◽  
pp. 745-749
Author(s):  
Wei Guo ◽  
Dong Mei Zhao
Keyword(s):  
Power System ◽  
Wind Power ◽  
Simulation Experiment ◽  
Wind Farms ◽  
The Other ◽  
Droop Control ◽  
Output Impedance ◽  
Compensation Strategy ◽  
Wind Power System ◽  
Virtual Impedance

This paper studies about two parts :one is about principle and construction of the equivalent capacitive output impedance of inverter, the other is that through comparing different compensation strategy of the application of simulation experiment, and verify the effect of C-Inverter.1) In this paper we study the droop control characteristics of three types of inverters with inductive, resistive and capacitive equivalent output impedance respectively, and use the virtual impedance to get C-Inverter in wind power.2) This paper sets up SVC and STATCOM models and improved the converter which changes to capacitive inverter in DIgSLIENT, which are connected to wind power system, verifying the validity of SVC and STATCOM models and the effect of C-Inverter.

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