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Featured researches published by Renke Han.


IEEE Transactions on Smart Grid | 2018

Consensus-Based Distributed Control for Accurate Reactive, Harmonic, and Imbalance Power Sharing in Microgrids

Jianguo Zhou; Sunghyok Kim; Huaguang Zhang; Qiuye Sun; Renke Han

This paper investigates the issue of accurate reactive, harmonic, and imbalance power sharing in a microgrid. Harmonic and imbalance droop controllers are developed to proportionally share the harmonic power and the imbalance power among distributed generation (DG) units and improve the voltage quality at the point of common coupling (PCC). Further, a distributed consensus protocol is developed to adaptively regulate the virtual impedance at fundamental frequency and selected harmonic frequencies. Additionally, a dynamic consensus based method is adopted to restore the voltage to their average voltage. With the proposed methods, the microgrid system reliability and flexibility can be enhanced and the knowledge of the line impedance is not required. And the reactive, harmonic, and imbalance power can be proportionally shared among the DG units. Moreover, the quality of the voltage at PCC can be greatly improved. Simulation and experimental results are presented to demonstrate the proposed method.


IEEE Transactions on Industry Applications | 2017

Containment and Consensus-Based Distributed Coordination Control to Achieve Bounded Voltage and Precise Reactive Power Sharing in Islanded AC Microgrids

Renke Han; Lexuan Meng; Giancarlo Ferrari-Trecate; E.A.A. Coelho; Juan C. Vasquez; Josep M. Guerrero

This paper presents a novel distributed approach to achieve both bounded voltage and accurate reactive power sharing regulation in ac microgrid. The coupling/trade-off effects between bus voltages and reactive power sharing regulation are first analyzed in detail to provide a guideline for coordinated control design. Furthermore, a containment and consensus-based distributed coordination controller is proposed, by which the bus voltage magnitudes can be bounded within a reasonable range, instead of only controlling average voltage value. Furthermore, the accurate reactive power sharing between distributed generators can be achieved simultaneously. Then, a detailed small-signal model is developed to analyze the stability of the system and the sensitivity of different parameters. Experimental results are presented and compared, where the controller performance, robust performance under communication failure, and plug-and-play operation are successfully verified.


IEEE Transactions on Industrial Informatics | 2018

Hierarchical Control Design for a Shipboard Power System With DC Distribution and Energy Storage Aboard Future More-Electric Ships

Zheming Jin; Lexuan Meng; Josep M. Guerrero; Renke Han

DC distribution is now becoming the major trend of future mobile power systems, such as more-electric aircrafts and ships. As dc distribution has different nature to the conventional ac system, a new design of well-structured control and management methods will be mandatory. In this paper, a shipboard power system with dc distribution and energy storage system (ESS) is picked as the study case. To meet the requirement of control and management of such a large-scale mobile power system, a hierarchical control design is proposed in this paper. In order to fully exploit the benefit of the ESS, as well as to overcome the limitation in controllability, a novel inverse-droop control method is proposed, in which the power sharing is according to the source characteristic, instead of their power rating. A frequency-division method is also proposed as an extension to the inverse-droop method for enabling a hybrid ESS and its autonomous operation. On the basis of the proposed methods, the control methods for management and voltage restoration levels are also proposed to establish a comprehensive control solution. Real-time simulations are carried out to validate the performance of the proposed control design under different operating conditions. When compared to more conventional droop-based approaches, the new proposal shows enhancement in efficiency.


applied power electronics conference | 2017

Containment and consensus-based distributed coordination control for voltage bound and reactive power sharing in AC microgrid

Renke Han; Lexuan Meng; Giancarlo Ferrari Trecate; E.A.A. Coelho; Juan C. Vasquez; Josep M. Guerrero

This paper offers a highly flexible and reliable control strategy to achieve voltage bounded regulation and accurate reactive power sharing coordinately in AC Micro-Grids. A containment and consensus-based distributed coordination controller is proposed, by which each output voltage magnitude can be bounded within a reasonable range and the accurate reactive power sharing among distributed generators can be also achieved. Combined with the two proposed controllers and electrical part of the AC Micro-Grid, a small signal model is fully developed to analyze the sensitivity of different control parameters. The effectiveness of the proposed controller in case of load variation, communication failure, plug-and-play capability are verified by the experimental setup as an islanded Micro-Grid.


conference of the industrial electronics society | 2016

Coupling/tradeoff analysis and novel containment control for reactive power, output voltage in islanded Micro-Grid

Renke Han; Lexuan Meng; Josep M. Guerrero; Qiuye Sun; Juan C. Vasquez

Based on the hierarchical control structure in islanded Micro-Grid (MG) systems, the coupling/tradeoff effects in different levels are analyzed in details. In the primary level, analyses of the coupling effects among droop control gains, line impedance differences, output reactive power and voltage magnitudes are provided specifically. In the secondary level, the tradeoffs between accurate reactive power sharing and voltage magnitudes regulation are further detailed. The analysis results can provide a guideline for the design of MG structure and its control parameters. In addition, novel containment-based controller is proposed to control the voltage into a reasonable range which is the first time to apply this algorithm in MG. Furthermore, dynamic-consensus-based controller is used to guarantee accurate reactive power sharing. The combination of controllers offers a coordinated distributed operation and enhanced system performance. Finally, experimental results are shown to validate the effectiveness of the proposed method.


european conference on cognitive ergonomics | 2017

Admittance-type RC-mode droop control to introduce virtual inertia in DC microgrids

Zheming Jin; Lexuan Meng; Renke Han; Josep M. Guerrero; Juan C. Vasquez

One of the major feature of DC microgrids is its high penetration of power electronic converters, as a result, the system inertia becomes a problem. In this paper, an admittance-type droop control with additional capability of introducing virtual inertia to the system. With the proposed method, each energy source will also contribute virtual inertia to the system, thus improving transient response and stability of the entire DC microgrid. The inertia issue of droop control is firstly analyzed. A comparative study is carried out between conventional method (i.e. impedance-type droop control method) and the new proposal in terms of their different control principles, characteristics of equivalent output admittance/impedance, and effectiveness in achieving desired virtual inertia introduction. Ultimately, simulations and experiments are carried out to verify proposed control methods. The results show improved system inertia and enhanced performance.


applied power electronics conference | 2017

Droop-free distributed control with event-triggered communication in DC micro-grid

Renke Han; Nelson Leonardo Diaz Aldana; Lexuan Meng; Josep M. Guerrero; Qiuye Sun

A novel nonlinear droop-free distributed controller is proposed to achieve accurate current sharing and eliminate voltage drops in dc Micro-Grid (MG). Then by introducing the sample and holding scheme, the proposed controller is extended to the event-triggered-based controller which is designed based on the Lyapunov approach to guarantee the global stability and convergence instead of localized stability. Meanwhile, the event-triggered-based controller can considerably reduce the communication traffic and significantly relax the requirement for precise real-time information transmission without sacrificing system performance. An experimental setup is built to validate the effectiveness of the proposed controller by comparing with different controllers and communication strategies.


advances in computing and communications | 2018

Plug-and-Play Voltage/Current Stabilization DC Microgrid Clusters with Grid-Forming/Feeding Converters

Renke Han; Josep M. Guerrero; Michele Tucci; Andrea Martinelli; Giancarlo Ferrari-Trecate

In this paper, we propose a new decentralized control scheme for Microgrid (MG) clusters, given by the interconnection of atomic dc MGs, each composed by grid-forming and grid-feeding converters. In particular, we develop a new Plug-and-Play (PnP) voltage/current controller for each MG in order to achieve simultaneous voltage support and current feeding function with local references. The coefficients of each stabilizing controller are characterized by explicit inequalities, which are related only to local electrical parameters of the MG. With the proposed controller, each MG can plug-in/out of the clusters seamlessly irrespectively of the power line parameters and models of other MGs. A profound proof of closed-loop stability of MG clusters is provided. Moreover, theoretical results are validated by hardware-in-loop (HiL.) tests.


IEEE Transactions on Power Electronics | 2018

A Decentralized Current-Sharing Controller Endows Fast Transient Response to Parallel DC–DC Converters

Haojie Wang; Minxiao Han; Renke Han; Josep M. Guerrero; Juan C. Vasquez

This paper proposes a decentralized current-sharing control strategy to endow fast transient response to paralleled dc–dc converters systems, such as dc microgrids or distributed power systems. The proposed controller consist of two main control loops: an external voltage droop control for current-sharing proposes and an internal current loop. The external droop control loop is designed as a voltage loop with embedded virtual impedance, which avoids the use of a slow voltage loop and a separate extra virtual impedance loop that may limit the system bandwidth. The internal current loop, thanks to the external control loop simplification, plays a major role in the system bandwidth, so that an adaptive proportional-integral (PI) controller is proposed for this matter. In the paper, two different droop control methods have been modeling, designed, simulated, and tested: The conventional virtual-impedance-loop based V–I droop and the proposed embedded-virtual-impedance based I–V droop. In order to compare the dynamic response performances between two droop controllers, their state-space models have been developed and analyzed in this paper. The results show that the dynamic response of the I–V droop control is faster than that of the conventional V–I droop control. Furthermore, by analyzing the effects from I–V droop control parameters, the errors can be reduced faster by enlarging the proportional terms, but with no fluctuations, and then completely eliminated by restoring back to small proportional values. Meanwhile, there exists a tradeoff phenomenon between the fast dynamic response and good steady-state performance; thus, an adaptive PI controller is proposed to both improve dynamic response and guarantee good steady-state performance simultaneously. Experimental results are shown to verify the accuracy of the models and the effectiveness of the proposed control framework.


european conference on cognitive ergonomics | 2017

Containment-based distributed coordination control to achieve both bounded voltage and precise current sharing in reverse-droop-based DC microgrid

Renke Han; Haojie Wang; Zheming Jin; Lexuan Meng; Josep M. Guerrero

A highly flexible and reliable control strategy is proposed to achieve bounded voltage and precise current sharing, which is implemented in a reverse-droop-based dc Micro-Grid. To acquire the fast-dynamic response, the reverse droop control is used to replace the V-I droop control in the primary level. In the secondary level, the containment-based controller is proposed to bound the bus voltages within a reasonable range and keep the necessary voltage deviations for power flow regulation; the consensus-based controller is simultaneous involved to regulate power flow achieving accurate current sharing among converters. Combined the proposed controllers with the electrical part of the dc Micro-Grid, a model is fully developed to analyze the sensitivity of different control coefficients. Experimental results are presented to demonstrate the effectiveness of the proposed method.

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Haojie Wang

North China Electric Power University

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Qiuye Sun

Northeastern University

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Giancarlo Ferrari-Trecate

École Polytechnique Fédérale de Lausanne

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Minxiao Han

North China Electric Power University

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E.A.A. Coelho

Federal University of Uberlandia

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