Impact of Circulating Current Control in Capacitor Voltage Ripples of Modular Multilevel Converters Under Grid Imbalances

Li, Jinke; Konstantinou, Georgios; Wickramasinghe, Harith R.; Pou, Josep; Wu, Xuezhi; Jin, Xin

doi:10.1109/tpwrd.2017.2747079

Cited by 36 publications

(18 citation statements)

References 27 publications

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“…A circulating current suppression controller (CCSC), which could prevent the arm circulating current by controlling the second harmonic current, is adopted and shown in Figure 7B. 28 Where, i iu and i il are currents, whose direction is illustrated in Figure 4, in upper and lower arms of Phase i (i = A, B, C), respectively. i zdr and i zqr are reference circulating currents in d-axis and q-axis, respectively.…”

Section: Control System Model Of Grid-connection Convertermentioning

confidence: 99%

DC‐type grid‐connection system of PV generation and its control schemes

Dai

Zhu

et al. 2019

Int Trans Electr Energ Syst

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Summary Compared with the AC‐type photovoltaic (PV) grid‐connection system, its DC counterpart has characteristics like simpler control mode, less power loss, and higher PV utilization. However, there are few researches that gave clearly the topology and control strategies of the DC‐type integration system of PV generation, especially systems with the multimodule boost full bridge isolation converter (BFBIC). In this paper, taking a pilot project as an example, the topology and control strategies of the DC‐type grid‐connection system are given. Models of the PV cell, the BFBIC, and the clamp double submodule (CDSM)‐based modular multilevel converter (MMC) are presented first. Then, the output voltage and power of PV are analyzed and compared. Suggestions on the application of the control strategy are given finally.

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Section: Control System Model Of Grid-connection Convertermentioning

confidence: 99%

DC‐type grid‐connection system of PV generation and its control schemes

Dai

Zhu

et al. 2019

Int Trans Electr Energ Syst

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“…In some applications, circulating currents can be used in a useful way, e.g., during the phase-to-ground fault, in which the MMC works in an asymmetrical operation whereby the power will flow through the upper and the lower MMC arms, leading to an imbalance of arm capacitor energy. In that case, improved control strategies were developed based on circulating current injection [19,20].…”

Section: Introductionmentioning

confidence: 99%

Deadbeat Predictive Current Control for Circulating Currents Reduction in a Modular Multilevel Converter Based Rail Power Conditioner

et al. 2020

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This paper presents a deadbeat predictive current control methodology to reduce the circulating currents in a modular multilevel converter (MMC) when it operates as a rail power conditioner (RPC) in a conventional railway system-based V/V connection. For this purpose, a half-bridge MMC based on half-bridge submodules, operating as an RPC is explained, and the total system is denominated as a simplified rail power conditioner (SRPC). The SRPC in this study is used to compensate harmonics, reactive power, and the negative sequence component of currents. This paper explains the SRPC system architecture, the key control algorithms, and the deadbeat predictive current control methodology. Mathematical analysis, based on the MMC equivalent circuit, is described and the reference equations are presented. Moreover, simulation results of the deadbeat predictive current control methodology are compared with the results of the conventional proportional-integral (PI) controller. This comparison is to verify the effectiveness of the proposed control strategy. Simulation results of the SRPC show reduced circulating currents in the MMC phases when using the predictive control approach, besides accomplishing power quality improvement at the three-phase power grid side.

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“…Realizing the development and utilization of green and clean energy has become a major trend to solve problems such as traditional energy shortages and environmental degradation. To ensure the consumption and efficient use of the large scale new energy, effective transmission technology is needed as a support [1]. As the multi-terminal high-voltage direct current (HVDC) transmission system has the advantages of long transmission distance capability, large capacity and a flexible operation mode, etc., it has therefore become one of the main means to facilitate grid connections of large-scale renewable energy [2].…”

Section: Introductionmentioning

confidence: 99%

Investigate on a Simplified Multi-Port Interline DC Power Flow Controller and Its Control Strategy

Zhang

Long

et al. 2019

Energies

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A DC power flow controller (DCPFC) can help to facilitate power flow routing in the multi-terminal high-voltage direct current (HVDC) transmission system. Realizing its multi-port output can effectively improve the device regulate range and capability. Based on analysis of the traditional multi-port interline DC power flow controller (MI-DCPFC), this paper presents a switches reduced topology of MI-DCPFC. In addition, for solving the problem of coupling of the port-output voltage of the traditional MI-DCPFC, a novel control strategy based on carrier phase shifting pulse width modulation (CPS-PWM) is proposed. It implements the decoupling of the port-output voltage of MI-DCPFC, which can ensure completely independent tracking of the power flow regulating commands for different controlled lines. Moreover, key relationships between the system state variables are also analyzed and detailed in this study. Finally, the performance of the proposed controller and control strategy are confirmed with the simulation and experiment studies under different conditions.

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Impact of Circulating Current Control in Capacitor Voltage Ripples of Modular Multilevel Converters Under Grid Imbalances

Cited by 36 publications

References 27 publications

DC‐type grid‐connection system of PV generation and its control schemes

DC‐type grid‐connection system of PV generation and its control schemes

Deadbeat Predictive Current Control for Circulating Currents Reduction in a Modular Multilevel Converter Based Rail Power Conditioner

Investigate on a Simplified Multi-Port Interline DC Power Flow Controller and Its Control Strategy

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