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Tuning of discrete complex proportional integral current controller for grid-connected converters based on critical damping

Zhihong Zhao, Yimin Li, Xuan Cao, Jia Yao, Baojian Ji, Jianfeng Zhao
2020 IEEE Access  
Current control is of utmost importance for grid-connected converters to achieve a high level of performance.  ...  Experimental results have verified the effectiveness of the developed method. INDEX TERMS Current control, grid connected converters, complex proportional integral, discretization.  ...  With this under consideration, a method for tuning of the current controller has been developed in this work, which is based on the principle of critical damping and performed directly in the discrete-time  ... 
doi:10.1109/access.2020.2978928 fatcat:jsxp5dtn2nf4hnsjy63wc33x6a

Dynamics estimation and generalized tuning of stationary frame current controller for grid-tied power converters

Weiyi Zhang, Daniel Remon, Antoni M. Cantarellas, Alvaro Luna, Pedro Rodriguez
2016 EPE Journal  
The control design for these converters becomes more challenging due to the reduced control bandwidth and increased complexity in the grid connection filter.  ...  This paper proposes an algorithm for estimating the dynamic performance of the stationary frame current controllers, and based on it a generalized and optimized tuning approach is developed.  ...  Considering that a current regulating loop is largely employed in various kinds of control strategies for grid-tied converters, [1] [2] [3] the performance of the current controller is critical.  ... 
doi:10.1080/09398368.2016.1261472 fatcat:5255famkr5bc3ptqi4vib6oody

Design of a grid adaptive controller for PWM converters with LCL filters

Markus Andresen, Marco Liserre, Friedrich W. Fuchs, Nils Hoffmann
2015 IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society  
The system resonance frequency of a grid connected inverter with LCL filter depends on the filter parameters and the time varying grid impedance.  ...  To obtain stability and to preserve good dynamic behavior of the system, grid impedance adaptation of the current controller is proposed.  ...  Commonly, proper current control of grid connected converters is ensured by introducing proportional-integral (PI) controllers, which are designed to be robust against parameter variations.  ... 
doi:10.1109/iecon.2015.7392671 dblp:conf/iecon/AndresenLFH15 fatcat:fqmoaihzdvcfbdbjcghnghor2q

Comparison of Current Control Strategies based on FCS-MPC and D-PI-PWM Control for Actively Damped VSCs with LCL-filters

Chee Shen Lim, Sze Sing Lee, Yi Chyn Cassandra Wong, Inam Ullah Nutkani, Hui Hwang Goh
2019 IEEE Access  
This paper presents a comparative study of the proportional-integral-based (PI-based) synchronous current control strategy with derivative-feedback-based active damping and the finite-controlset model-predictive-control-based  ...  (FCS-MPC-based) synchronous current control strategy with costfunction-based active damping.  ...  About the main current controllers, proportional-integral [3] , [7] , [16] and proportional-resonant [12] , [13] , [17] controllers are common.  ... 
doi:10.1109/access.2019.2934185 fatcat:42hmb5rpwrhsbkwygq45gqxeq4

Methodology for Analysis and Design of DiscreteTime Current Controllers for Three-Phase PWM Converters

Christoph H. van der Broeck, Sebastian A. Richter, Jochen von Bloh, Rik W. De Doncker
2018 CPSS Transactions on Power Electronics and Applications  
In this work, a methodology for the analysis and design of robust, high bandwidth current controllers for three phase converters is presented.  ...  For this framework, a step by step design procedure based on the complex root locus is proposed that allows an insightful optimization of its feedback gains.  ...  Discrete Time Converter Model The discrete time model of a PWM converter connected to the utility grid is developed based on the state block diagram of the plant depicted in Fig. 6 .  ... 
doi:10.24295/cpsstpea.2018.00025 fatcat:ftmuu56jqjduvmygqqdzvpspaa

Digital proportional multi-resonant current controller for improving grid-connected photovoltaic systems

Pedro M. Almeida, Pedro G. Barbosa, Janaina G. Oliveira, Jorge L. Duarte, Paulo F. Ribeiro
2015 Renewable Energy  
The performance of the discretetime designed controller is tested on a grid-connected photovoltaic power plant.  ...  This paper presents the modeling and design steps of a digital proportional multi-resonant controller used in a grid-connected photovoltaic (PV) system.  ...  control strategy.  ... 
doi:10.1016/j.renene.2014.11.087 fatcat:bqiah5itorczpl5algfzzx3ibq

A Unified Current Loop Tuning Approach for Grid-Connected Photovoltaic Inverters

Weiyi Zhang, Daniel Remon, Antoni Cantarellas, Pedro Rodriguez
2016 Energies  
This paper proposes a unified current loop tuning approach for grid-connected converters. The calculating algorithm based on crossover frequency and the phase margin is used.  ...  Among all of the aspects for converter control, the inner current loop for grid-connected converters characterizes the system performance considerably.  ...  Conflicts of Interest: The authors declare no conflicts of interest.  ... 
doi:10.3390/en9090723 fatcat:azf2qj7bjnh4pfd7knszrulqoa

An embedded voltage harmonic compensation strategy for current controlled DG interfacing converters

Xin Zhao, Lexuan Meng, Josep M. Guerrero, Mehdi Savaghebi, Juan C. Vasquez, Chuan Xie, Xiaohua Wu
2016 2016 IEEE Energy Conversion Congress and Exposition (ECCE)  
Harmonics have been considered as one of the major issues in future power grids.  ...  While for DG converters operating in Current-Controlled Mode (CCM), such function was rarely studied.  ...  The effectiveness of the control scheme has been validated with one converter connected to the grid through LCL filter.  ... 
doi:10.1109/ecce.2016.7854841 fatcat:4mr3qryihnhybocqlq3ickatim

Discrete-Time DC-Link Voltage and Current Control of a Grid-Connected Inverter with LCL-Filter and Very Small DC-Link Capacitance

Oliver Kalmbach, Christian Dirscherl, Christoph M. Hackl
2020 Energies  
The controller design is performed in discrete time and it is based on a detailed stability analysis of the dc-link voltage controller to determine the controller parameters which guarantee stability for  ...  The inner loop is a state-feedback current controller that is designed based on the discrete linear-quadratic regulator (DLQR) theory.  ...  The self-tuning controller adapts both its proportional and integral gain, depending on the operating point of the system.  ... 
doi:10.3390/en13215613 fatcat:o435kq327fhohalh3ottb7wdwa

Virtual Inertia-Based Inverters for Mitigating Frequency Instability in Grid-Connected Renewable Energy System: A Review

Kah Yung Yap, Charles R. Sarimuthu, Joanne Mun-Yee Lim
2019 Applied Sciences  
Unlike conventional power generation, the lack of rotational inertia becomes the main challenge to interface RES with the electrical grid via power electronic converters.  ...  The transition from the synchronous generator (SG)-based conventional power generation to converter-based renewable energy sources (RES) deteriorates the frequency stability of the power system due to  ...  Acknowledgments: This research was funded by the School of Engineering, Monash University, Malaysia. Conflicts of Interest: The authors declared that there is no conflict of interest.  ... 
doi:10.3390/app9245300 fatcat:65mh4luxqvhdfac7qyw7sjbyya

Analysis and Comparison of Notch Filter and Capacitor Voltage Feedforward Active Damping Techniques for LCL Grid-Connected Converters

Enrique Rodriguez-Diaz, Francisco D. Freijedo, Juan Vasquez, Josep M. Guerrero
2018 IEEE transactions on power electronics  
Alternatively, active damping strategies, where the resonance damping is provided by the current controller, are of major interest.  ...  main current controller.  ...  Fig. 1 : 1 Current control of LCL grid-connected VSC converter.  ... 
doi:10.1109/tpel.2018.2856634 fatcat:nh55q7jejbdttkauqytzfavasi

Stability Analysis of Three-Phase PWM Converter with LCL Filter by Means of Nonlinear Model

Božo Terzić, Goran Majić, Alojz Slutej
2010 Automatika  
In this paper the stability problem of the three phase PWM converters with LCL filter without additional passive or active damping is analyzed.  ...  The system with the converter current feedback is considered where the stability problem is more acute.  ...  Fig. 20 shows the grid current waveform and its spectra for the critical proportional gain (K i = 2.1).  ... 
doi:10.1080/00051144.2010.11828376 fatcat:rm4zgntix5fbpnbt4fl365wspi

Digital Control Techniques Based on Voltage Source Inverters in Renewable Energy Applications: A Review

Sohaib Tahir, Jie Wang, Mazhar Baloch, Ghulam Kaloi
2018 Electronics  
A common solution is the integration of power electronics converters in the systems for connecting distributed generation systems to the stand-alone loads.  ...  In [36] , an output voltage controller based on the resonant harmonic filters is presented. It measures the capacitor current and load current in the same sensor.  ...  One-leg block diagram of an active damping control strategy for a grid-connected VSI.  ... 
doi:10.3390/electronics7020018 fatcat:ixmj4fw64faqfclz5jb34b4rpa

Tuning of Synchronous-Frame PI Current Controllers in Grid-Connected Converters Operating at a Low Sampling Rate by MIMO Root Locus

Francisco D. Freijedo, Ana Vidal, Alejandro G. Yepes, Josep M. Guerrero, Oscar Lopez, Jano Malvar, Jesus Doval-Gandoy
2015 IEEE transactions on industrial electronics (1982. Print)  
With this perspective, this paper presents a systematic procedure for accurate dynamics assessment and tuning of synchronous-frame PI current controllers, which is based on linear control for multiple  ...  Current controller performance is key in gridconnected power converters for renewable energy applications.  ...  BACKGROUND Fig. 1 represents a power converter connected to the grid and its discrete controller based on a dq-PI with feedback decoupling implementation [1] .  ... 
doi:10.1109/tie.2015.2402114 fatcat:xinkahi6zrdhxdjeqw4cmebdcq

Robust Active Damping in LCL-filter based Medium-Voltage Parallel Grid-Inverters for Wind Turbines

Rafael Pena-Alzola, Javier Roldan Perez, Emilio Bueno, Francisco Huerta, David Campos-Gaona, Marco Liserre GAE, Graeme M. Burt
2018 IEEE transactions on power electronics  
Abstract-LCL-filter based grid-tie inverters require damping for current-loop stability. There are only software modifications in active damping, whereas resistors are added in passive damping.  ...  2018) Robust active damping in LCL-filter based medium-voltage parallel grid-inverters for wind turbines. IEEE Transactions on Power Electronics. ISSN 0885-8993 , http://dx.  ...  Fig. 3 : 3 Current control of the LCL-filter based three-phase inverter with active damping based on notch-filter/lag-filter.  ... 
doi:10.1109/tpel.2018.2801126 fatcat:35aq6jpb6ngerbwmoy522xwp5u
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