Virtual Impedance Sliding Mode Control-Based MMC Circulating Current Suppressing Strategy

Yang, Xiaofeng; Li, Zejie; Zheng, Trillion Q.; You, Xiaojie; Kobrle, Pavel

doi:10.1109/access.2019.2900471

Cited by 19 publications

(14 citation statements)

References 40 publications

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“…The three-phase grid voltages u s are taken for examples to explore the harmonics transfer rule of Park transformation. u s are the three-phase input voltages of the Park transformation, which are assumed to contain harmonic and unbalanced distortion, as expressed in (2):…”

Section: The Basic D-q Decoupled Control Of MMCmentioning

confidence: 99%

“…The modular multilevel converter (MMC) was first introduced in [1]. The MMC stands for the significant technological innovation among the diverse voltage source converters (VSCs), and it has been avowedly identified as an appropriate solution for converters in high-voltage direct current transmission (HVDC) [2]. Recently, with the increasing numbers of MMC-HVDC projects, the MMC has attracted widespread attention [3], [4].…”

Section: Introductionmentioning

confidence: 99%

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Mitigation of Background Harmonics Effect on MMC Controller Based on a Novel Coordinate Transformation Technique

et al. 2019

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With the increasing numbers of high-voltage direct current transmission (HVDC) projects based on the modular multilevel converter (MMC), the power quality of the grid-connected MMC has drawn attention. By using peripheral filtering equipment to mitigate the background harmonic effect on MMC leads to several numbers of problems, e.g., high costs, difficulty in parameter tuning, the resonance problem, etc. Therefore, this paper focuses on the mitigation of harmonic pollution for the MMC controller without filters. Based on the multi-layer coordinate transformation structures, a novel nested decoupled synchronous reference frame (NDSRF) transformation technique is presented to attain the harmonics compensation in the coordinate transformation process. Besides, analyses of the proposed NDSRF coordinate transformation technique, including harmonics transfer rules and harmonics rejection principles, are further given in the time domain. Furthermore, to reduce the harmonic content of MMC output voltages in case of a power grid with serious harmonic pollution, the harmonic resistant MMC controller based on the NDSRF technique is proposed. Finally, the simulation results are demonstrated to validate the background harmonic suppression function of the harmonic resistant MMC controller based on the NDSRF transformation technique. INDEX TERMS MMC, power quality, d-q decoupled controller, harmonic transfer, coordinate transformation.

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Section: The Basic D-q Decoupled Control Of MMCmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mitigation of Background Harmonics Effect on MMC Controller Based on a Novel Coordinate Transformation Technique

et al. 2019

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“…In [22], the application of the sliding mode control for controlling of the active and reactive powers was demonstrated. Some works have discussed suppressing the MMC's circulating current [23].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Control of HVDC Links for Frequency Stability Enhancement in Low-Inertia Systems

2020

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Decarbonization of power systems has put Renewable Energy Sources (RES) at the forefront when it comes to electric power generation. The increasing shares of converter-connected renewable generation cause a decrease of the rotational inertia of the Electric Power System (EPS), and consequently deteriorate the system capability to withstand large load-generation imbalances. Low-inertia systems are subjected to fast and large frequency changes in case of in-feed loss, where the traditional primary frequency control is not sufficient to preserve the frequency stability and to maintain the frequency above the critical value. One possible solution to this rising problem is seen in Fast Frequency Response (FFR) provided by the High-Voltage Direct-Current (HVDC)-based systems. This paper presents the adaptive FFR control of HVDC-based systems for frequency stability enhancement in the low-inertia system. The EPS is considered as a “black box” and the HVDC response is determined only using the locally measured frequency change. Sliding Mode Control (SMC) of the Modular Multilevel Converter (MMC) was developed and demonstrated to provide faster and more appropriate frequency response compared to the PI controller. The described adaptive HVDC control considers the size of disturbance and the inertia of the power system, and it is verified by simulations on the IEEE 39 bus test system implemented in MATLAB/Simulink for different system configurations and different sizes of disturbance.

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“…A circulating current suppression method based on even-harmonics repetitive control scheme is presented in [22]. A novel circulating current suppressing strategy based on virtual impedance sliding mode control (VI-SMC-CCS) is proposed in [23]. Reference [24] applies model predictive control into circulating current suppression.…”

Section: Introductionmentioning

confidence: 99%

A Novel Advanced Traction Power Supply System Based on Modular Multilevel Converter

Peng

Han

et al. 2019

IEEE Access

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Due to the attractive advantages such as modularity, scalability and excellent power quality of modular multilevel converter (MMC), converters based on MMC could be a promising alternative solution for traction transformer. A novel MMC-based advanced co-phase traction power supply system is proposed in this paper to solve power quality issues and eliminate the neutral sections in the traditional traction power supply system. And in the proposed system, a DC power transmission system is designed, which provides convenient access for distributed energies benefiting the utilization of the natural resources such as solar energy and wind energy along railways. In order to ensure the normal operation of the proposed system, nearest-level modulation considering voltage balancing is designed for MMCs. The mathematic model three-phase MMC-based rectifier is derived in detail. Based on the mathematic model, dual current-loop control is designed for the rectifier. Besides, the parallel operating traction substations suffer circulating current issue. A droop control combining with double closed-loop control is designed to deal with the problem. The correctness and feasibility of the system and its modulation and control strategies is verified through simulation and a small-scale experiment. INDEX TERMS Electrified railway, traction power supply system, modular multilevel converter (MMC), three-phase rectifier, single-phase inverter.

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Virtual Impedance Sliding Mode Control-Based MMC Circulating Current Suppressing Strategy

Cited by 19 publications

References 40 publications

Mitigation of Background Harmonics Effect on MMC Controller Based on a Novel Coordinate Transformation Technique

Mitigation of Background Harmonics Effect on MMC Controller Based on a Novel Coordinate Transformation Technique

Adaptive Control of HVDC Links for Frequency Stability Enhancement in Low-Inertia Systems

A Novel Advanced Traction Power Supply System Based on Modular Multilevel Converter

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