Active and Reactive Power Control of Modular Multilevel Converter Using Sliding Mode Controller

Ishfaq, Muhammad; Uddin, Waqar; Zeb, Kamran; Islam, Saif ul; Hussain, Saddam; Khan, Imran; Kim, Sang-Yong

doi:10.1109/icomet.2019.8673460

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…The upper and lower arms have one arm inductor L, constraining the circulating current flowing within the MMC. V dc is the DC side voltage that must be persistent in maintaining a constant DC output voltage in each phase of MMC [14,42].…”

Section: Modular Multilevel Convertersmentioning

confidence: 99%

Fault‐tolerant modular multilevel converter for a seamless transition between stand‐alone and grid‐connected microgrid

Mahmoud

Hafez

Yousef

et al. 2022

IET Power Electronics

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Recently, renewable distributed generation (DG) systems have emerged to improve the power system security and reliability while reducing the environmental incompatibility of fossil fuel power plants. DG could operate either as a standalone and/or as a grid‐connected power system. The interfacing circuits of DG and their controls have to comply with utility quality regulations and afford a seamless transition from online to offline and vice versa. This article advises a simple and robust control scheme for a modular multilevel converter (MMC) that interfaces with a photovoltaic (PV) generator. The proposed control method ensures high‐quality output voltage/current waveform in online and/or offline operating modes. Moreover, the proposed control provides a seamless and swift transition from standalone to grid‐connected and vice versa. The exhibited control scheme is simulated with MATLAB/Simulink. Real‐time simulator OPAL‐RT OP4510 is used to verify the displayed simulation results. The simulation results determine the accomplishment of the proposed control technique for a seamless transition from the grid‐connected mode to the standalone mode and vice versa via MMC.

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Section: Modular Multilevel Convertersmentioning

confidence: 99%

Fault‐tolerant modular multilevel converter for a seamless transition between stand‐alone and grid‐connected microgrid

Mahmoud

Hafez

Yousef

et al. 2022

IET Power Electronics

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“…The conventional sliding surface can ensure that the plant will be converged in finite time, but the steadyerror cannot be eliminated. Ishfaq et al proposed an SMC controller which is called the super-twisting controller (STC) [24]. The advantage of the STC is the ability to prevent chattering, and the controller design is not based on the time derivative of the sliding variable.…”

Section: Introductionmentioning

confidence: 99%

An Improved Sliding Mode Control with Integral Surface for a Modular Multilevel Power Converter

et al. 2022

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This paper presents a novel method for current control for a modular multilevel converter (MMC). The proposed current control methodology is based on a modified sliding mode control (SMC) with proportional and integral (PI) sliding surface which allows fast transient responses and improves the robustness of the MMC control performance. As the proposed method is derived via Lyapunov direct method, the closed-loop stability is ensured and results in globally asymptotically stable. Furthermore, the reaching time is also guaranteed by the proposed method, leading to fast transient responses. The proposed method is validated by comparing with some existing methods, which are proportional integral controller and conventional SMC, via offline and hardware-in-loop (HIL) simulations where a 10 MW, medium-voltage MMC system is tested. According to these results, the proposed method is able to provide fast transient responses, zero overshoot, and robustness to the weak grid and short-circuit conditions.

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“…Other research on power control is found in [7], where a structure was proposed for active and reactive power control in a multi-level modular converter. In this research, the current was decomposed into the dq axes using the Park transform.…”

Section: Introductionmentioning

confidence: 99%

Design of an On-Grid Microinverter Control Technique for Managing Active and Reactive Power in a Microgrid

et al. 2021

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This paper presents the design and implementation of an on-grid microinverter control technique for managing active and reactive power based on a dq transformation. The system was implemented in a solar microinverter development kit (Texas Instruments—TMDSSOLARUINVKIT). This microinverter has two stages: DC-DC and DC-AC. The DC-DC stage contains an active clamp flyback converter, where the maximum power point tracking (MPPT) of the solar panel is obtained with a current-based incremental conductance algorithm. The DC-AC stage comprises a dual-buck inverter in which voltage-, current-, and phase-tracking control loops are implemented to control the active and reactive power. These techniques were simulated in MATLAB using the proposed mathematical model and experimentally validated in the solar development kit. The results show that the simulated model behaved similarly to the real system, and the control techniques presented good performance. The maximum power point (MPP) of the solar panel was monitored in the DC-DC stage using a current reference provided by the incremental conductance MPPT algorithm and was regulated by a 2P2Z control. The algorithm is robust against continuous changes in irradiance, as it quickly follows the ideal power and continually operates at a point close to the MPP. In addition, the active and reactive power control in the DC-AC stage enables the microinverter to supply the maximum active power. Moreover, the microinverter supplies reactive power according to a defined reference and within the established limits. The proposed mathematical model of the microinverter can be used to design new control techniques and other microinverter topologies. In addition, this active and reactive power-control technique can be implemented in low-power and low-cost microinverters to successfully maintain power quality in small microgrids.

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Active and Reactive Power Control of Modular Multilevel Converter Using Sliding Mode Controller

Cited by 12 publications

References 18 publications

Fault‐tolerant modular multilevel converter for a seamless transition between stand‐alone and grid‐connected microgrid

Fault‐tolerant modular multilevel converter for a seamless transition between stand‐alone and grid‐connected microgrid

An Improved Sliding Mode Control with Integral Surface for a Modular Multilevel Power Converter

Design of an On-Grid Microinverter Control Technique for Managing Active and Reactive Power in a Microgrid

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