Novel circulating current suppression strategy for MMC based on quasi-PR controller

Geng, Shengbao; Gan, Yiliang; Li, Yungui; Hang, Lijun; Li, Guojie

doi:10.1109/apec.2016.7468380

Cited by 17 publications

(4 citation statements)

References 15 publications

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“…The resonant control structure to eliminate second-order, fourth-order, and sixth-order harmonics is described in Figure 14b [92,104]. In addition, for the sake of control robustness, the improved quasi proportional resonant controller is adopted to eliminate the circulating current, as shown in Figure 14c [105,106]. Except for eliminating the circulating current, the circulating current injection method is developed to reduce the submodule voltage ripple.…”

Section: Circulating Current Controlmentioning

confidence: 99%

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A Review of Modular Multilevel Converters for Stationary Applications

et al. 2020

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A modular multilevel converter (MMC) is an advanced voltage source converter applicable to a wide range of medium and high-voltage applications. It has competitive advantages such as quality output performance, high modularity, simple scalability, and low voltage and current rating demand for the power switches. Remarkable studies have been carried out regarding its topology, control, and operation. The main purpose of this review is to present the current state of the art of the MMC technology and to offer a better understanding of its operation and control for stationary applications. In this study, the MMC configuration is presented regarding its conventional and advanced submodule (SM) and overall topologies. The mathematical modeling, output voltage, and current control under different grid conditions, submodule balancing control, circulating current control, and modulation methods are discussed to provide the state of the MMC technology. The challenges linked to the MMC are associated with submodule balancing control, circulating current control, control complexity, and transient performance. Advanced nonlinear and predictable control strategies are expected to improve the MMC control and performance in comparison with conventional control methods. Finally, the power losses associated with the advanced wide bandgap (WBG) power devices (such as SiC, GaN) are explored by using different modulation schemes and switching frequencies. The results indicate that although the phase-shifted carrier-based pulse width modulation (PSC-PWM) has higher power losses, it outputs a better quality voltage with lower total harmonic distortion (THD) in comparison with phase-disposition pulse width modulation (PD-PWM) and sampled average modulation pulse width modulation (SAM-PWM). In addition, WBG switches such as silicon carbide (SiC) and gallium nitride (GaN) devices have lower power losses and higher efficiency, especially at high switching frequency in the MMC applications.

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Section: Circulating Current Controlmentioning

confidence: 99%

“…Sci. 2020, 10, x FOR PEER REVIEW 20 of 36 is adopted to eliminate the circulating current, as shown in Figure 14c [105,106]. Except for eliminating the circulating current, the circulating current injection method is developed to reduce the submodule voltage ripple.…”

Section: Circulating Current Controlmentioning

confidence: 99%

A Review of Modular Multilevel Converters for Stationary Applications

et al. 2020

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“…Its existence increases the RMS value of arm currents, causing extra loss in the system. Consequently, many suppression methods have been proposed [13], [36]- [39]. In this paper, the proportional resonant (PR) controller is adopted.…”

Section: Relationship Between Consensus Theory and MMC Control Amentioning

confidence: 99%

Interpreting the Individual Capacitor Voltage Regulation Control of PSC-PWM MMC via Consensus Theory

Song

Liu

2019

IEEE Access

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In computer science, consensus theory has been studied for decades. ''Consensus'' in a multiagent system means reaching an agreement regarding a certain quantity of interest. The modular multilevel converter (MMC) is a promising topology for medium-and high-power applications owing to its salient features. In MMC operation, one key point is to regulate the capacitor voltage of each submodule (SM). The SMs in MMCs are interconnected both physically and via a control system, and these SMs can be regarded as a multi-agent system, with the control objective of regulating their capacitor voltages, which could formulate a consensus problem. In this paper, through mathematical derivation, it is found that individual capacitor voltage regulation control of phase-shifted-carrier pulse-width modulation (PSC-PWM) MMC is one special case of consensus theory. Furthermore, based on the consensus theory, the influence of different communication structures on the MMC voltage regulation performance is discussed. The analysis proves that the existing one has the highest rate of convergence. The impact of current-tracking dynamics on consensus-based interpretation is also analyzed. In addition, the proportional relationship between the rate of convergence and the P controller parameter is also justified. The experiments on a seven-level down-scaled prototype are conducted to confirm the analysis.

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“…One approach is to focus on reducing harmonic components, which leads to a slower dynamic response [9]. Enhanced methods based on quasi-proportional resonant (quasi-PR) controllers propose a more detailed dc and harmonic reference follow along with improved transient response [10]. These controllers are usually designed to cope with a limited order of harmonics as the controller complexity grows with accuracy.…”

Section: Introductionmentioning

confidence: 99%

Circulating Current Elimination of Grid-Connected Modular Multilevel Converters

Shahnazian

Adabi

Pouresmaeil

et al. 2018

2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Syst

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This paper presents an analytical dynamic model of a modular multilevel converter (MMC) in grid-connected operating mode. The proposed model is then efficiently used to design a circulating current controller. The proposed controller can accurately study the dynamic and steady-state performance of the converter through harmonic evaluations. Based on this configuration, the modulation is accomplished so that the stable performance of the converter in the network is obtained, which is considered as the foremost novelty of the proposed control method over existing control methods. In order to mitigate the circulating currents, the proposed controller inserts an estimated second harmonic component into modulation indices, which is considered as the second novelty of the proposed control method. The functionality and capability of the proposed control method are validated using detailed theoretical analysis and simulations with MATLAB/Simulink.

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Novel circulating current suppression strategy for MMC based on quasi-PR controller

Cited by 17 publications

References 15 publications

A Review of Modular Multilevel Converters for Stationary Applications

A Review of Modular Multilevel Converters for Stationary Applications

Interpreting the Individual Capacitor Voltage Regulation Control of PSC-PWM MMC via Consensus Theory

Circulating Current Elimination of Grid-Connected Modular Multilevel Converters

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