Adaptive integrated control strategy for MMC-MTDC transmission system considering dynamic frequency response and power sharing

Liu, Yingpei; Hu, Jiangyu; Shi, Jinpeng; Yang, Bicheng

doi:10.1016/j.ijepes.2022.108858

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…With the generalization of distributed energy sources and new types of load access to power systems, traditional distribution networks are experiencing problems such as voltage overruns, bidirectional tidal currents, and feeder power imbalances [1][2][3]. Flexible multistate switches (FMSSs), widely used in medium-voltage distribution grids, can realize continuous and precise power control, improve feeder voltage distribution, and increase the reliability of grid power supply.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Quasi-Super-Twisting Sliding Mode Control for Flexible Multistate Switch

Ma,

Wang,

Wang

et al. 2024

Energies

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The mathematical model of a flexible multistate switch (FMSS) exhibits nonlinear and strong coupling characteristics, whereas traditional power decoupling control makes it difficult to completely decouple the output power. The traditional proportional–integral control parameters are difficult to adjust, and their robustness and dynamic performance are poor, which affects the stability of the voltage of the power distribution network and feeder power. To address these problems, this study first converted the original system into a linear system via coordinate transformation using feedback-accurate linearization to decouple active and reactive currents. Thereafter, a super-twisting sliding mode control (ST-SMC) algorithm was introduced, and an adaptive quasi-super-twisting sliding mode control (AQST-SMC) algorithm comprising the quasi-sliding mode function and adaptive proportional term was proposed. An FMSS double closed-loop controller was designed to achieve improved vibration suppression and convergence speed. A three-port FMSS simulation model was developed using MATLAB/Simulink, and the simulation results show that the proposed control strategy enhances the robustness and dynamic performance of the system.

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Section: Introductionmentioning

confidence: 99%

Adaptive Quasi-Super-Twisting Sliding Mode Control for Flexible Multistate Switch

Ma,

Wang,

Wang

et al. 2024

Energies

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“…However, this control strategy was only applied in two-terminal flexible DC transmission and was not tested in multi-terminal flexible systems. In [13], a virtual inertia control was applied to the VSC-MTDC system and the effect of selecting the virtual inertia coefficient on the DC voltage was considered. However, the virtual inertia coefficient is a constant value, which limits the ability of the DC system to participate in frequency regulation.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Droop Control of VSC-MTDC System Based on Virtual Inertia

Zhang

et al. 2023

Electronics

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In order to solve the problem that the voltage source converter based multi-terminal direct current (VSC-MTDC) system cannot provide inertia and participate in frequency modulation after connecting to the AC power grid under the traditional control strategy, an adaptive control strategy based on virtual inertia is proposed. First, the relationship between AC frequency and DC voltage was established by a virtual inertia control, allowing the VSC-MTDC system to provide inertia to the AC side. Second, to address the limited inertia coefficient selection due to DC voltage deviation, an adaptive control was adopted. When the DC voltage deviation is small, the inertia coefficient is increased to obtain a better inertial response; on the contrary, the inertia coefficient is reduced to prevent the DC voltage from exceeding the limit. Finally, to solve the problem of insufficient flexibility of the fixed droop coefficient, this paper introduces the power margin of a VSC-station into the droop coefficient to dynamically adjust the distribution ratio of unbalanced power and reduce the DC voltage deviation. The three-terminal VSC-MTDC system was modelled on the PSCAD/EMTDC simulation platform, and the superiority of the control strategy was highlighted in this paper by comparing it with conventional droop control and a fixed virtual inertia coefficient.

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Distributed cooperative control for global power sharing management of interconnected microgrids in flexible multi-terminal DC connection scheme

Meng,

Wang,

Shao

et al. 2024

Electric Power Systems Research

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Adaptive integrated control strategy for MMC-MTDC transmission system considering dynamic frequency response and power sharing

Cited by 6 publications

References 27 publications

Adaptive Quasi-Super-Twisting Sliding Mode Control for Flexible Multistate Switch

Adaptive Quasi-Super-Twisting Sliding Mode Control for Flexible Multistate Switch

Adaptive Droop Control of VSC-MTDC System Based on Virtual Inertia

Distributed cooperative control for global power sharing management of interconnected microgrids in flexible multi-terminal DC connection scheme

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