On the Backstepping Approach for VSC-HVDC and VSC-MTDC Transmission Systems

Ayari, Mohamed; Belhaouane, Mohamed Moez; Jammazi, Chaker; Braïek, Naceur Benhadj; Guillaud, Xavier

doi:10.1080/15325008.2017.1289571

Cited by 12 publications

(12 citation statements)

References 16 publications

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“…In order to maintain the output stability of the MMC in the grid-connection station when its input changes, the double-loop control of MMCs based on current vector is adopted and shown in Figure 7A. 19,27 Where, U dc and U dcref are the DC-side voltage and its reference voltage, respectively, and U dcref = 60 kV. Q s and Q sref are the AC-side measured reactive power and its reference value, respectively, and Q sref = 0.…”

Section: Control System Model Of Grid-connection Convertermentioning

confidence: 99%

“…In DC‐type grid‐connection systems, MMCs are more favorable to reduce harmonics and more adaptable to various voltage levels, because of its structural characteristics . MMC usually adopts double‐loop control in which the inner loop is the current control, and the outer loop controller cooperates with other converter stations …”

Section: Introductionmentioning

confidence: 99%

“…18 MMC usually adopts double-loop control in which the inner loop is the current control, and the outer loop controller cooperates with other converter stations. 19,20 Therefore, a CDSM-MMC with fault isolation capability is adopted at the grid-connection station in this paper. The IPOS-connected BFBICs are used in the PV station to boost the voltage and reduce switching losses.…”

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confidence: 99%

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DC‐type grid‐connection system of PV generation and its control schemes

Dai

Zhu

et al. 2019

Int Trans Electr Energ Syst

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Summary Compared with the AC‐type photovoltaic (PV) grid‐connection system, its DC counterpart has characteristics like simpler control mode, less power loss, and higher PV utilization. However, there are few researches that gave clearly the topology and control strategies of the DC‐type integration system of PV generation, especially systems with the multimodule boost full bridge isolation converter (BFBIC). In this paper, taking a pilot project as an example, the topology and control strategies of the DC‐type grid‐connection system are given. Models of the PV cell, the BFBIC, and the clamp double submodule (CDSM)‐based modular multilevel converter (MMC) are presented first. Then, the output voltage and power of PV are analyzed and compared. Suggestions on the application of the control strategy are given finally.

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Section: Control System Model Of Grid-connection Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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DC‐type grid‐connection system of PV generation and its control schemes

Dai

Zhu

et al. 2019

Int Trans Electr Energ Syst

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“…The nonlinear state-space model of the MMC converter is defined in (26). Considering the following polynomial control law, Δu = −K w1 Δx wg − K w2 Δx [2] wg + N wg Δy…”

Section: Polynomial Control Design For MMC Convertermentioning

confidence: 99%

“…1 The 2-level voltage source converter (VSC) topology has been widely used to conversion electrical energy. 2 However, in high-voltage and high-power Nomenclature: Abbreviations, HVDC, high-voltage direct current; LQR, linear quadratic regulator; LS, least squares; MMC, Modular Multilevel Converter; PCC, point of common coupling; rms, root mean square; SM, submodule; , Symbols; i, ith SM; j, jth phase of 3-phase system (j = a, b, c); (.) ref , reference value; (.)…”

Section: Introductionmentioning

confidence: 99%

Global advanced control strategy for Modular Multilevel Converter integrated in a HVDC link

Ayari

Belhaouane

Guillaud

et al. 2018

Int Trans Electr Energ Syst

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Modular Multilevel Converter (MMC) is becoming a promising converter technology for high-voltage direct current transmission systems due to its high modularity, availability, and power quality. It is a multi-input-multi-output nonlinear system. The control system for MMC is required to simultaneously achieve multiple control objectives. Existing control strategies for MMC are complex and the controller parameter design is not straightforward for the nonlinear systems with highly coupled states. In view of this, a steady-state model for the MMC is developed on bilinear deviation state-space model around a working point. Based on linear quadratic regulator and least squares methods, a nonlinear polynomial feedback law is designed to simultaneously control the grid and differential currents, and the global stored energy and energy balancing between total upper and lower arms. To generate the optimal current references, a multivariable linear quadratic controller is used to regulate the total energy per leg, energy difference between each upper and lower arms, and the DC bus voltage. The proposed high-level controller depicts an original advanced control structure of MMC converter. The performance of the proposed strategy for a detailed model of 400-level MMC is evaluated using simulations in MATLAB/SIMULINK/SPS software environment. KEYWORDSbilinear model, LQR approach, Modular Multilevel Converter (MMC), energies and DC voltage control, polynomial control Int Trans Electr Energ Syst. 2018;28:e2511. wileyonlinelibrary.com/journal/etep

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