Robust Control Design of MMC-HVDC Systems Using Multivariable Optimal Guaranteed Cost Approach

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

doi:10.1109/tia.2019.2900606

Cited by 49 publications

(32 citation statements)

References 27 publications

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“…However, various SM architectures have been proposed to improve the inverter performance, among which the MM-NPC and the MM-FC converters stand out [101], [102]. Although this topology was firstly developed for HVDC systems [46], [103], [104], it is also used in AC/AC cycloconverters [105] or medium-voltage and high-power industrial drive applications [40], [42], [106].…”

Section: E: Cascaded H-bridge (Chb) Convertermentioning

confidence: 99%

Common-Mode Voltage Elimination in Multilevel Power Inverter-Based Motor Drive Applications

et al. 2022

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Section: E: Cascaded H-bridge (Chb) Convertermentioning

confidence: 99%

Common-Mode Voltage Elimination in Multilevel Power Inverter-Based Motor Drive Applications

et al. 2022

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“…In fact, the optimal performance of one control loop could come at the expense of the performance degradation of other control loops [7]. Therefore, in such a multivariable, heavily coupled control system, a multivariable design technique, which enables simultaneous design of the control loops, is required to obtain optimal system performance with guaranteed stability [11].…”

Section: Introductionmentioning

confidence: 99%

Optimal $\mathcal {H}_{\infty }$ Control Design for MMC-Based HVDC Links

Tavakoli

Fekriasl

Prieto‐Araujo

et al. 2022

IEEE Trans. Power Delivery

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The modular multilevel converter (MMC) has emerged as the preferred choice for voltage source converter (VSC)-based high voltage direct current (HVDC) systems due to its low losses, low harmonic distortion, modularity, and redundancy. These advantages come at the expense of a complex control system with the strong coupling among its control variables, which complicates the design procedure of both its individual control loops and the DC link controllers. In fact, the performance improvement of a control loop could lead to degraded performance of other loops. Hence, to deal with such a complex dynamic system, this article suggests adopting multivariable H∞ optimal control techniques in order to ensure stability and optimized performance of a VSC-HVDC link. First, a full-order, centralized multi-input-multi-output (MIMO) controller is derived based on H∞ optimisation and used as a benchmark for the system performance level. Then, a fixedstructure, decentralized MIMO controller is synthesized to make a compromise between the optimal performance and feasibility of practical implementation. Finally, simulations are conducted to evaluate and compare the performance and robustness degradation due to the migration from a high-order, centralized controller towards a low-order, decentralized controller.

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“…During an unbalanced fault, thermal control of MMC was discussed; however, the converter peak current limit was not addressed in [26]. The uncertainty in the submodule capacitance and arm inductance was addressed using optimal guaranteed cost control theory while leaving current limiter and grid code requirements in [27]. For overvoltage protection in the HVDC link and submodule capacitance, a controller with a conventional current limiter was discussed in [28].…”

Section: Introductionmentioning

confidence: 99%

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

Hossain

Abido

2020

IEEE Access

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Positive and negative sequence based current control strategy is developed for the modular multilevel converter (MMC), which complies with the grid code requirements during the balanced and unbalanced faults at the point of common coupling of AC grids. This research proposes an efficient and simplified current limiting technique to keep the inverter individual phase current at a predefined threshold during faults. In this work, the current controller of the MMC converter is designed based on stationary reference frame while positive sequence synchronous reference frame is used to design the current limiter. The proposed work considers the complete dynamics of permanent magnet synchronous generator (PMSG) and doubly fed induction generator (DFIG) based wind energy. The MMC aggregate model is developed and simulated in Matlab/Simulink. The MMC model is also developed using real-time digital simulation (RTDS). A comparative performance analysis between the proposed and the conventional current limiter is provided where the proposed sequence-based current controller with the current limiter shows promising performance under severe disturbances. Besides grid compliance, the results with the proposed control scheme demonstrate the improvement of low voltage ride-through capability without any violation of converter current and HVDC link voltage limits.

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Robust Control Design of MMC-HVDC Systems Using Multivariable Optimal Guaranteed Cost Approach

Cited by 49 publications

References 27 publications

Common-Mode Voltage Elimination in Multilevel Power Inverter-Based Motor Drive Applications

Common-Mode Voltage Elimination in Multilevel Power Inverter-Based Motor Drive Applications

Optimal $\mathcal {H}_{\infty }$ Control Design for MMC-Based HVDC Links

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

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