An Improved Model Predictive Control Method for Three-Port Soft Open Point

Wang, Zhengqi; Sheng, Liusen; Huo, Qunhai; Hao, Shuai

doi:10.1155/2021/9910451

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…In this research, the AQST-SMC was designed to effectively suppress the ji er and speed up the response; it exhibits good dynamic performance and response time. The steady-state inverse model [7] was used to improve the traditional power outer-loop controller, which improves the outer-loop regulation rate and eliminates the static error of the system. For example, this study analyzed MMC1 running in the UdcQ operation mode, and MMC2 and MMC3 running in the PQ mode.…”

Section: Aqst-smc Voltage Outer Ring Designmentioning

confidence: 99%

“…The proportional-integral (PI) control strategy has been applied [6]; however, this presents challenges, such as difficult parameter adjustment and weak anti-interference ability of multiport FMSSs. In a previous study [7,8], instead of PI control, finite-set model predictive control (MPC) was proposed, which showed excellent dynamic characteristics and anti-interference in a steady state along with a high current response speed. However, such a model presents challenges, such as unstable switching frequency, high control system computation, and model mismatch.…”

Section: Introductionmentioning

confidence: 99%

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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: Aqst-smc Voltage Outer Ring Designmentioning

confidence: 99%

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 structure of the two-port SOP is displayed in Figure 1 [32], where the rectifier side and the inverter side are interconnected by the capacitance of the DC side.…”

Section: Dynamic Model Of the Sopmentioning

confidence: 99%

Full-Order Terminal Sliding-Mode Control for Soft Open Point

Zhou

et al. 2022

Energies

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In this paper, a full-order terminal sliding-mode control method is proposed for the rectifier side and the inverter side of the soft open point (SOP). The rectifier-side DC voltage control system consists of the voltage- and current-loops with controllers which are designed using full-order sliding-mode (FOSM) to enhance the dynamic performances and anti-disturbance. The integral type virtual control signal without chattering is designed to compensate for the unmatched uncertainties including external disturbances and some parameter perturbations. The full-order terminal sliding-mode (FOTSM) controller for the current-loop can force the current response to track its reference in finite time. The inverter side power control system is designed to regulate the power. The FOTSM controller for the power-loop ensures the power-tracking accuracy under a disturbed condition. Finally, the simulations demonstrate the effectiveness of the proposed controllers for the rectifier and inverter sides in the soft open point (SOP).

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Extended state observer-based predictive control for soft open point

Wang

Lu²,

Zhou³

et al. 2023

Front. Energy Res.

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This paper proposes an extended state observer-based ultra-local model-free three-vector predictive control method for Soft Open Point (SOP). First, the Ultra-Local Model-Free Predictive Control (ULMFPC) method is proposed to improve the robustness of the system, which only uses the input and output of the outer-loop, and any other parameters are not involved. Second, considering parameter perturbations and external disturbances in the SOP system, an expansion state observer (ESO) is established to observe the SOP system’s total perturbations and the perturbations are compensated in real-time to improve the system. Third, to solve the problem of significant current harmonics in traditional model predictive control (MPC), a three-vector MPC method (TV-MPC) is adopted to reduce the total harmonic distortion rate (THD) of the current. Finally, it is verified by simulation that the proposed method can effectively reduce the current harmonics of the SOP system, rate value setting time, and improve the dynamic performance effectively. When perturbations occur in the system, the proposed method can improve the anti-interference and robustness of the system.

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An Improved Model Predictive Control Method for Three-Port Soft Open Point

Cited by 3 publications

References 26 publications

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

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

Full-Order Terminal Sliding-Mode Control for Soft Open Point

Extended state observer-based predictive control for soft open point

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