scholarly journals Impedance Reshaping and Stability Analysis of the Unbalanced Three-phase System Considering the Grid-tied Inverter based Imbalance Compensation

2021 ◽  
Vol 2087 (1) ◽  
pp. 012018
Author(s):  
Wei Jin ◽  
Feng Gao ◽  
Lu Liu
Keyword(s):  
Stability Analysis ◽  
Control Method ◽  
Energy Resources ◽  
Phase System ◽  
Renewable Energy Resources ◽  
Output Impedance ◽  
Asymmetric System ◽  
Three Phase ◽  
Control Scheme ◽  
The Stability

Abstract Grid-tied inverters have been adopted both as the interface of renewable energy resources and as a solution to address power quality issues. To compensate the imbalance distortion caused by asymmetric local load, DQ transformation based compensation method is introduced into the control scheme of the grid-tied inverter. Taking both the inverter control scheme and circuit topology into account, the space vector based impedance modelling and stability analysis approaches are proposed in this paper to analyse the dynamic of the asymmetric system with active imbalance compensation. The proposed impedance models indicate that the compensation control method can reshape the output impedance features, and affect the stability of the system. The stability analysis results are verified in this paper by experimental results.

scholarly journals Coupling Influence on the dq Impedance Stability Analysis for the Three-Phase Grid-Connected Inverter

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3676
Author(s):  
Chuanyue Li ◽  
Taoufik Qoria ◽  
Frederic Colas ◽  
Jun Liang ◽  
Wenlong Ming ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Nyquist Plot ◽  
Current Control ◽  
Impedance Ratio ◽  
Three Phase ◽  
Grid Impedance ◽  
Nyquist Criterion ◽  
Grid Connected Inverter ◽  
The Stability ◽  
The Right

The dq impedance stability analysis for a grid-connected current-control inverter is based on the impedance ratio matrix. However, the coupled matrix brings difficulties in deriving its eigenvalues for the analysis based on the general Nyquist criterion. If the couplings are ignored for simplification, unacceptable errors will be present in the analysis. In this paper, the influence of the couplings on the dq impedance stability analysis is studied. To take the couplings into account simply, the determinant-based impedance stability analysis is used. The mechanism between the determinant of the impedance-ratio matrix and the inverter stability is unveiled. Compared to the eigenvalues-based analysis, only one determinant rather than two eigenvalue s-function is required for the stability analysis. One Nyquist plot or pole map can be applied to the determinant to check the right-half-plane poles. The accuracy of the determinant-based stability analysis is also checked by comparing with the state-space stability analysis method. For the stability analysis, the coupling influence on the current control, the phase-locked loop, and the grid impedance are studied. The errors can be 10% in the stability analysis if the couplings are ignored.

scholarly journals Impedance Modeling and Stability Analysis for Cascade System of Three-Phase PWM Rectifier and LLC Resonant Converter

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3050 ◽  
Author(s):  
Rutian Wang ◽  
Yuyang Wu ◽  
Guoqing He ◽  
Ying Lv ◽  
Jiaxing Du ◽  
...  
Keyword(s):  
Resonant Converter ◽  
Pwm Rectifier ◽  
Output Impedance ◽  
Cascade System ◽  
Signal Model ◽  
Impedance Model ◽  
Small Signal Model ◽  
Three Phase ◽  
Llc Resonant Converter ◽  
The Stability

In this paper; the impedance model of PWM rectifier and LLC resonant converter are deduced, and the stability analysis of cascade system is studied. The principle of three-phase PWM rectifier is introduced; and the small signal model in d-q coordinate system is deduced. The expression of dc side output impedance model for PWM rectifier is derived. The LLC resonant converter is operated in a fixed-frequency state, and the LLC resonant converter is modeled as a small signal model. On this basis, the input impedance model expression of the LLC resonant converter is derived. According to the impedance stability criterion, it can seen that the amplitude of input impedance is greater than the amplitude of output impedance in a certain frequency domain. In addition, the Nyquist curve is not around the point (−1,0), which can judge that the cascade system is stable. In simulation software, a cascade system simulation is built and corresponding simulation curves are obtained, which verifies the stability of the cascade system.

Divided DQ Small-Signal Model: A New Perspective for the Stability Analysis of Three-Phase Grid-Tied Inverters

2019 ◽  
Vol 66 (8) ◽  
pp. 6493-6504 ◽  
Author(s):  
Zhikang Shuai ◽  
Yang Li ◽  
Weimin Wu ◽  
Chunming Tu ◽  
An Luo ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Small Signal ◽  
Signal Model ◽  
Small Signal Model ◽  
Three Phase ◽  
New Perspective ◽  
The Stability

Control Scheme of Three-Level NPC Inverter for Integration of Renewable Energy Resources Into AC Grid

2012 ◽  
Vol 6 (2) ◽  
pp. 242-253 ◽  
Author(s):  
Edris Pouresmaeil ◽  
Daniel Montesinos-Miracle ◽  
Oriol Gomis-Bellmunt
Keyword(s):  
Renewable Energy ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Control Scheme

Modeling, Control and Regenerative Brakingof BLDC Machines in Electric Bycicles

2020 ◽  
Author(s):  
Elmer O. H. Catata ◽  
Pedro J. dos Santos Neto ◽  
Tárcio A. S. Barros ◽  
Ernesto Ruppert Filho
Keyword(s):  
Electric Vehicles ◽  
Energy Resources ◽  
Motor Vehicles ◽  
Regenerative Braking ◽  
Brushless Dc Motor ◽  
Renewable Energy Resources ◽  
Brushless Dc ◽  
Three Phase ◽  
Phase Converter ◽  
Comprehensive Modeling

The autonomy of electric vehicles is under investigation by the scientific community,in which different solutions based on renewable energy resources, such as the photovoltaic, areproposed. A solution under study is the utilization of regenerative braking developed by theelectric motor vehicles. In this work, the addition of a regenerative braking is proposed aimingto increase the autonomy of electric bicycles. A two level, three-phase converter is applied todrive a brushless DC motor (BLDC). A comprehensive modeling of current and speed control arepresented in order to operate the machine in quadrants I and IV. The behavior of the Lithiumbattery charge is observed through its state-of-charge (SOC). Simulation results were obtainedby means of the SimPowerSystemsR©/Matlab/SimulinkR©software.

Switching Control Design for Switched Fuzzy Discrete-Time Systems

2014 ◽  
Vol 1006-1007 ◽  
pp. 711-714
Author(s):  
Hong Yang ◽  
Huan Huan Lü ◽  
Le Zhang
Keyword(s):  
Stability Analysis ◽  
Discrete Time ◽  
Fuzzy Systems ◽  
Closed Loop ◽  
Control Method ◽  
Control Design ◽  
Switching Control ◽  
Discrete Time Systems ◽  
The Stability ◽  
Time Systems

This paper investigates the problems of stability analysis and stabilization for a class of switched fuzzy discrete-time systems. Based on a common Lyapunov functional, a switching control method has been developed for the stability analysis of switched discrete-time fuzzy systems. A new stabilization approach based on a switching parallel distributed compensation scheme is given for the closed-loop switched fuzzy systems. Finally, the illustrative example is provided to demonstrate the effectiveness of the techniques proposed in this paper.

scholarly journals Remote Laboratory Testing Demonstration

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2283 ◽  
Author(s):  
Luigi Pellegrino ◽  
Carlo Sandroni ◽  
Enea Bionda ◽  
Daniele Pala ◽  
Dimitris T. Lagos ◽  
...  
Keyword(s):  
Smart Grid ◽  
Real Time ◽  
Energy Resources ◽  
Test Facility ◽  
Renewable Energy Resources ◽  
Voltage Controller ◽  
Time Simulation ◽  
The Stability ◽  
Time Required ◽  
Load Tap Changer

The complexity of a smart grid with a high share of renewable energy resources introduces several issues in testing power equipment and controls. In this context, real-time simulation and Hardware in the Loop (HIL) techniques can tackle these problems that are typical for power system testing. However, implementing a convoluted HIL setup in a single infrastructure can be physically impossible or can increase the time required to test a smart grid application in detail. This paper introduces the Joint Test Facility for Smart Energy Networks with Distributed Energy Resources (JaNDER) that allows users to exchange data in real-time between two or more infrastructures. This tool enables the integration of infrastructures, exploiting the synergies between them, and creating a virtual infrastructure that can perform more experiments using a combination of the resources installed in each infrastructure. In particular, JaNDER can extend a HIL setup. In order to validate this new testing concept, a coordinated voltage controller has been tested in a Controller HIL setup where JaNDER was used to interact with an actual On Load Tap Changer (OLTC) controller located in a remote infrastructure. The results show that the latency introduced by JaNDER is not critical; hence, under certain circumstances, it can be used to expand the real-time testing without affecting the stability of the experiment.

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