A fully decentralized control of grid-connected cascaded inverters

Summary This paper presents a series‐parallel photovoltaic (PV)‐storage independent microgrid (MG), where low‐voltage distributed generation units could be connected to power grid conveniently. Moreover, it provides a promising way to form medium voltage MG. For this proposed structure, a decentralized control is proposed. The PV units are controlled by a maximum power point tracking (MPPT)‐based droop control, where MPPT of the PV units is achieved. Storage units are regulated via a “droop” controller dependent its reactive power polarity and take the responsibility of keeping the power supply‐demand balance of the MG. Since all these controllers make decisions only based on their local information, the proposed control is reliable and cost‐effective. Moreover, the small‐signal stability of the system is proved. And simulation results are presented to verify the effectiveness.

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“…In this section, the small-signal stability of the PV-storage MG will be investigated by root locus technique. [37][38][39][40]…”

Section: Stability Analysismentioning

confidence: 99%

A series-parallel PV-storage independent microgrid and its decentralized control

Liu

Yuan

et al. 2018

Int Trans Electr Energ Syst

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“…Inverter#1 can achieve a desired PF according to practical requirements. All other 1 1 In Figure 1, V 1~Vn and δ 1~δn are amplitudes and phase angles of the inverters' output voltages. V g and δ g represent amplitude and phase angle of the grid voltage, respectively.…”

Section: Schematic Overview Of the Proposed Decentralized Controlmentioning

confidence: 99%

“…Renewable energy generation is drawing more and more attention in the past decades [1][2][3][4][5]. AC-stacked photovoltaic (PV) inverter architecture is now considered a promising PV generation configuration [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters

et al. 2018

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For an AC-stacked photovoltaic (PV) inverter system with N cascaded inverters, existing control methods require at least N communication links to acquire the grid synchronization signal. In this paper, a novel decentralized control is proposed. For N inverters, only one inverter nearest the point of common coupling (PCC) needs a communication link to acquire the grid voltage phase and all other N − 1 inverters use only local measured information to achieved fully decentralized local control. Specifically, one inverter with a communication link utilizes the grid voltage phase and adopts current control mode to achieve a required power factor (PF). All other inverters need only local information without communication links and adopt voltage control mode to achieve maximum power point tracking (MPPT) and self-synchronization with grid voltage. Compared with existing methods, the communication link and complexity is greatly reduced, thus improved reliability and reduced communication costs are achieved. The effectiveness of the proposed control is verified by simulation tests.

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“…An adaptative droop control for balancing the state of charge of multiple energy storage systems in decentralized microgrids is studied in [29]. Moreover, numerous control methodologies have been proposed to improve the ac microgrid performance [30][31][32][33][34][35][36][37]. A fully decentralized control and a f P/Q droop control scheme of gridconnected cascaded inverters are reported [30,31].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, numerous control methodologies have been proposed to improve the ac microgrid performance [30][31][32][33][34][35][36][37]. A fully decentralized control and a f P/Q droop control scheme of gridconnected cascaded inverters are reported [30,31]. A cost-function-based decentralized power quality compensation method realizing simultaneously bus voltage compensation and inverter current sharing is proposed [32].…”

Section: Introductionmentioning

confidence: 99%

Stability analysis and decentralized control of inverter-based ac microgrid

Firuzi

Roosta

Gitizadeh

2019

Prot Control Mod Power Syst

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This work considers the problem of decentralized control of inverter-based ac micro-grid in different operation modes. The main objectives are to (i) design decentralized frequency and voltage controllers, to gather with power sharing, without information exchange between microsources (ii) design passive dynamic controllers which ensure stability of the entire microgrid system (iii) capture nonlinear, interconnected and large-scale dynamic of the micro-grid system with meshed topology as a port-Hamiltonian formulation (iv) expand the property of shifted-energy function in the context of decentralized control of ac micro-grid (v) analysis of system stability in large signal point of view. More precisely, to deal with nonlinear, interconnected and large-scale structure of micro-grid systems, the port-Hamiltonian formulation is used to capture the dynamic of micro-grid components including microsource, distribution line and load dynamics as well as interconnection controllers. Furthermore, to deal with large signal stability problem of the microgrid system in the grid-connected and islanded conditions, the shifted-Hamiltonian energy function is served as a storage function to ensure incremental passivity and stability of the microgrid system. Moreover, it is shown that the aggregating of the microgrid dynamic and the decentralized controller dynamics satisfies the incremental passivity. Finally, the effectiveness of the proposed controllers is evaluated through simulation studies. The different scenarios including grid-connected and islanded modes as well as transition between both modes are simulated. The simulation conforms that the decentralized control dynamics are suited to achieve the desired objective of frequency synchronization, voltage control and power sharing in the grid-connected and islanded modes. The simulation results demonstrate the effectiveness of the proposed control strategy.

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A fully decentralized control of grid-connected cascaded inverters

Cited by 79 publications

References 7 publications

A series-parallel PV-storage independent microgrid and its decentralized control

A series-parallel PV-storage independent microgrid and its decentralized control

A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters

Stability analysis and decentralized control of inverter-based ac microgrid

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