Harmonic Optimization Strategy for CPS-PWM Based MMCs Under Submodule Capacitor Voltage Reduction Control

Jiang, Huijie; Deng, Fujin; Wang, Zheng; Zou, Zhixiang; Li, Binbin; Blaabjerg, Frede

doi:10.1109/tpel.2021.3128359

Cited by 13 publications

(5 citation statements)

References 26 publications

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“…The zero-sequence voltage amplitude is equal to the rated phase voltage. The positive and negative DC voltages contain the fundamental frequency component whose amplitude and phase are the same as the zero-sequence voltage component, which proves the correctness of Equation (12). Since the AC distribution system is the arc suppression coil grounding, the zero-sequence current is less than 16 A, as shown in Figure 9d.…”

Section: System Response Characteristics Of Traditional Control Strategymentioning

confidence: 52%

“…Figure 9a-f shows the response waveforms of three-phase AC voltage negative DC voltage, AC zero-sequence voltage, AC zero-sequence current voltage and the inserted SM number of the upper arm in phase A on the can be seen from Figure 9 that the voltage of phase A drops to zero quickly and the voltages of phase B and C increase to 1.73 times the rated phase vol sequence voltage amplitude is equal to the rated phase voltage. The positiv DC voltages contain the fundamental frequency component whose amplitu are the same as the zero-sequence voltage component, which proves the Equation (12). Since the AC distribution system is the arc suppression coil g zero-sequence current is less than 16 A, as shown in Figure 9d.…”

Section: System Response Characteristics Of Traditional Control Strategymentioning

confidence: 58%

“…Reference [11] proposes three topology structures of SNOP, and comprehensively compares their advantages and disadvantages combined with the analysis of AC/DC fault characteristics. Reference [12] analyzes the fault characteristics of the bridge arm fault, and proposes a protection strategy based on closing the sub-module (SM) bypass switch to ensure the reliable action of the AC breaker. Reference [13] studies the relevant characteristics of single-phase grounding faults in AC systems and single-pole grounding faults in DC SNOP systems with a single transformer.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

AC Fault Ride-Through Strategy of a Transformerless Soft Normally Open Point

Xu¹,

Huang²,

Lu³

et al. 2022

Applied Sciences

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This paper focuses on the soft normally open point (SNOP) which has no transformers and connects to the 10 kV distribution network through the arc suppression coil grounding mode. A mathematical model containing positive-, negative-, and zero-sequence components under AC fault is established by the circuit analysis and the sequence component decomposition. Then the voltage fluctuation mechanism at the DC side and the non-fault AC side caused by the zero-sequence voltage on the fault side is analyzed under the case without transformers. Taking the single-phase grounding fault as an example, the fluctuation formula of the DC voltage and AC voltage is deduced in detail. Based on the theoretical analysis, the zero-sequence control strategy and the sub-module improvement strategy of the modular multilevel converter (MMC) are proposed. A back-to-back SNOP simulation model is established in PSCAD/EMTDC. The simulation results verify the accuracy of the theoretical analysis, as well as the validity of zero-sequence control and MMC topology improvement strategies.

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Section: System Response Characteristics Of Traditional Control Strategymentioning

confidence: 52%

Section: System Response Characteristics Of Traditional Control Strategymentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

AC Fault Ride-Through Strategy of a Transformerless Soft Normally Open Point

Xu¹,

Huang²,

Lu³

et al. 2022

Applied Sciences

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“…However, if an excessively low scaling coefficient is used, the SM capacitor undervoltage protection may be triggered [12], [13]. Several research studies have thus focused on identifying the maximum and the minimum SM capacitor voltages to properly design the scaling coefficient, as seen in grid-tied MMC [11], [14], [15] and in MMC-based motor drive systems [12], [16]. Differing from those systems, the modulation reference of the MMC-based GE can be close to zero, yet the DUT still continues to inject fault current for low-voltage ride through (LVRT), which worsens SM capacitor overvoltage or undervoltage [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Mitigation of Transient Overvoltage and Voltage Imbalance in Submodule Capacitors for MMC-Based Grid Emulators

Li,

Zhao,

Munk-Nielsen

et al. 2023

Preprint

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“…It is preferred in many high-power scenarios, such as high-speed maglev traffic linear motor drive system [1][2][3]. This is due to its advantages such as simple topology, lower ripple and total harmonic distortion of output voltage and current compared to the two-level VSI [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression

Niu

et al. 2022

Sustainability

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The three-level neutral-point clamped voltage source inverter (3L-NPC-VSI) is widely used in the maglev traction systems due to its high output voltage, large output capacity and low output current harmonics. In order to improve the utilization of the DC-bus voltage, an overmodulation strategy is necessary. This paper proposes an improved overmodulation strategy based on the minimum amplitude error method for a 3L-NPC-VSI. Compared with the conventional overmodulation strategy based on the minimum amplitude error method, the utilization of the DC-bus voltage is higher. Meanwhile, a virtual space vector modulation strategy is adopted for inverter neutral-point (NP) voltage balance and common-mode voltage (CMV) suppression. Furthermore, the suppression of leakage current also has been verified. Furthermore, the implementation details of the proposed overmodulation strategy based on minimum amplitude error method is elaborated. The effectiveness of the proposed method is verified by simulation and experimental results.

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Harmonic Optimization Strategy for CPS-PWM Based MMCs Under Submodule Capacitor Voltage Reduction Control

Cited by 13 publications

References 26 publications

AC Fault Ride-Through Strategy of a Transformerless Soft Normally Open Point

AC Fault Ride-Through Strategy of a Transformerless Soft Normally Open Point

Analysis and Mitigation of Transient Overvoltage and Voltage Imbalance in Submodule Capacitors for MMC-Based Grid Emulators

An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression

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