A Decentralized Coordination Control Method for Parallel Bidirectional Power Converters in a Hybrid AC–DC Microgrid

Yang, Pengcheng; Xia, Yanghong; Yu, Miao; Wei, Wei; Peng, Yonggang

doi:10.1109/tie.2017.2786200

Cited by 104 publications

(64 citation statements)

References 36 publications

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“…Load sharing as a main issue in microgrids first reported regarding AC microgrids in several literatures, such as in Yang et al and Xia et al The study system in the previous studies is a hybrid microgrid, and the conventional AC droop control is used for load sharing between bidirectional power converters (BPCs). In Yang et al and Xia et al, the effect of transmission line resistance on the load sharing and voltage regulation has not been discussed. On the other hand, in this paper, the focus is on the DC microgrid, and thus as will be discussed later, we use conventional DC droop control together with a new proposed compensator, which result in accurate load sharing and proper voltage regulation under non‐negligible transmission lines resistances.…”

Section: Introductionmentioning

confidence: 99%

“…For example, in Xia et al, 31 to stabilize the system under presence of CPLs, an improved droop control based on the Pdc-V dc 2 is proposed, which compared with the conventional droop control, can upgrade the system stability. Load sharing as a main issue in microgrids first reported regarding AC microgrids in several literatures, such as in Yang et al and Xia et al 32,33 The study system in the previous studies 32,33 is a hybrid microgrid, and the conventional AC droop control is used for load sharing between bidirectional power converters (BPCs). In Yang et al and Xia et al, 32,33 the effect of transmission line resistance on the load sharing and voltage regulation has not been discussed.…”

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confidence: 99%

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A generalized droop‐based compensator for addressing the issues raised in a DC microgrid comprising hybrid wind‐battery‐back up generation sources

Rahimi

Ghadiriyan

2019

Int Trans Electr Energ Syst

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Summary This paper deals with the improvement of stability margin, dynamic behavior, and steady state performance of a direct current (DC) microgrid system consisting of wind energy sources, battery energy storage, and back up generation source. The DC microgrid control system should set the DC bus voltage at the allowable range and provide proper load sharing among generation sources. Accurate load sharing, proper voltage regulation, and dynamic stability of the system at presence of constant power loads (CPLs) are the main problems that may be raised in operation of DC microgrid systems. In order to address these issues, this paper proposes a generalized droop‐based compensator that not only stabilizes the DC microgrid dynamics at high penetration of CPLs, but also addresses the issues such as inaccurate load sharing and improper voltage regulation. The proposed generalized droop‐based compensator comprises three parts: the first part enhances the DC microgrid stability even at high penetration of CPL, the second part compensates the transmission lines voltage drops and improves the function of voltage regulation, and the third part performs proper load sharing among different generation sources. At the end, capability of the proposed compensator is examined by frequency response analysis and time domain simulations.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

A generalized droop‐based compensator for addressing the issues raised in a DC microgrid comprising hybrid wind‐battery‐back up generation sources

Rahimi

Ghadiriyan

2019

Int Trans Electr Energ Syst

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“…Due to the diversity and decentralization of distributed energy, power converters are usually used to connect them in order to realize energy conversion and management. How to achieve parallel operation, accurate load current sharing between power converters, and maintain stability has become a research hotspot in microgrids [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. With the increasing demand of DC power at load side and the rapid development of distributed DC power sources such as photovoltaic cells, wind power, storage batteries, fuel cells, and supercapacitors, the research on DC microgrids has been gradually increasing in recent years [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Novel Autonomous Current-Sharing Control Strategy for Multiple Paralleled DC–DC Converters in Islanded DC Microgrid

et al. 2019

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Due to the existence of line impedances and low-bandwidth communication, the traditional peer-to-peer control method based on droop control has difficult meeting the requirements of current sharing and voltage stability in islanded DC microgrids at the same time. In this paper, a novel current-sharing control strategy based on injected small ac voltage with low frequency and low amplitude is proposed for multiple paralleled DC-DC converters. The small ac voltage is superimposed onto the output voltage of each converter. Then, the reactive circulating power is generated and used to regulate the output DC voltage of each converter. Under the droop characteristic between the injected frequency and output DC current, a feedback mechanism is generated to realize the accurate current sharing. On this basis, a reactive power-voltage limiter link and virtual negative impedance are added. Under the interaction of the two links, the bus voltage drop caused by line impedances can be almost completely eliminated. This method does not need any communication or to change the hardware structure. The controller design process is presented in detail along with a system stability analysis. Finally, the feasibility and effectiveness of the proposed control strategy are validated by the results obtained from simulations and experiments.

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“…From among different structures, the hybrid DC/AC microgrid has been the subject of more comprehensive management and control discussions for both DC and AC power. 18 In Xiao et al, 19 using a unified detection strategy, two droop-based and improved virtual impedance-based control techniques have been proposed for a hybrid DC/AC microgrid to reduce circulating current and offer a power-sharing deviation performance. 16 For instance, in order to increase the power quality of a hybrid DC/AC microgrid supplying nonlinear and unbalanced loads, a control method based on decentralized power sharing has been proposed in Shahnia et al 17 In both gridconnected and islanded operating conditions, three aims of decreasing the circulating currents of bidirectional power converters, providing suitable power integration, and achieving a good load power sharing have been intended by designing a decentralized coordination control strategy.…”

mentioning

confidence: 99%

“…16 For instance, in order to increase the power quality of a hybrid DC/AC microgrid supplying nonlinear and unbalanced loads, a control method based on decentralized power sharing has been proposed in Shahnia et al 17 In both gridconnected and islanded operating conditions, three aims of decreasing the circulating currents of bidirectional power converters, providing suitable power integration, and achieving a good load power sharing have been intended by designing a decentralized coordination control strategy. 18 In Xiao et al, 19 using a unified detection strategy, two droop-based and improved virtual impedance-based control techniques have been proposed for a hybrid DC/AC microgrid to reduce circulating current and offer a power-sharing deviation performance. To deal with both load sharing and power management, a decentralized control strategy has been considered for a hybrid single/three-phase islanded microgrid including the sources of photovoltaic (PV)/battery units.…”

mentioning

confidence: 99%

Distributed energy storage system‐based nonlinear control strategy for hybrid microgrid power management included wind/PV units in grid‐connected operation

Holari

Taher

Mehrasa

2019

Int Trans Electr Energ Syst

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Summary In this paper, a control strategy based on a combination of Lyapunov theory and input‐output feedback linearization (IOFL) has been proposed to provide stable operation for a hybrid DC/AC microgrid under unbalanced generations of the AC units. The DC link of the considered hybrid microgrid was supplied through photovoltaic (PV)‐based buck and lithium battery‐based (LB‐based) bidirectional DC/DC converters. A DC/AC converter was connected to the DC link and set to provide the required active and reactive power for reaching the desired waveforms for the point of common coupling (PCC) voltages. To accurately control the aforementioned converters, the mathematical equations were first achieved and then the proposed IOFL was designed to obtain the control inputs. To enhance the IOFL performance, several control loops regarding DC link voltage variations were considered for all converters. The main contribution of the proposed IOFL is that the control input of the LB‐based bidirectional DC/DC converter consists of both control inputs of the DC link‐connected inverter. As another contribution of this paper, total energy due to the control inputs' errors was completely investigated through the Lyapunov theory, leading to effective dynamic parts for the control inputs. In addition, the DC and AC power sharing was comprehensively evaluated based on both AC and DC specifications. For further analysis, the effects of angular frequency variations on the inverter control inputs were presented. Simulation results through MATLAB/SIMULINK software verified the accuracy and ability of the proposed control strategy.

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A Decentralized Coordination Control Method for Parallel Bidirectional Power Converters in a Hybrid AC–DC Microgrid

Cited by 104 publications

References 36 publications

A generalized droop‐based compensator for addressing the issues raised in a DC microgrid comprising hybrid wind‐battery‐back up generation sources

A generalized droop‐based compensator for addressing the issues raised in a DC microgrid comprising hybrid wind‐battery‐back up generation sources

A Novel Autonomous Current-Sharing Control Strategy for Multiple Paralleled DC–DC Converters in Islanded DC Microgrid

Distributed energy storage system‐based nonlinear control strategy for hybrid microgrid power management included wind/PV units in grid‐connected operation

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