Control and Derived Topologies of Parallel Hybrid Converter

Patro, Siba Kumar; Shukla, Anshuman

doi:10.1109/tia.2020.3031554

Cited by 19 publications

(5 citation statements)

References 68 publications

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“…In an urban distribution network, the phase difference among supply areas connected to the SNOP is generally not large, e.g., −15 • ~15 • . Therefore, although the AC voltage of MMC2 is different from Equation (17), it is still close. Equation ( 17) still has the reference value.…”

Section: Characteristic Analysis Of Single-phase Grounding Faultmentioning

confidence: 89%

“…SNOP can be installed in several key locations of the distribution network. Figure 1 shows three typical ways [17]: (1) SNOP1: Connect two feeder lines in the same supply area; (2) SNOP2: Connect two feeder lines in different supply areas; (3) SNOP3: Connect multiple feed lines through multiple converters. This paper takes SNOP2 as an example.…”

Section: System Connection Form and Mathematical Modelmentioning

confidence: 99%

“…Comparing Equations ( 10) and (17), it is obvious that the AC voltage of MMC2 is equal to MMC1 (the fault side), when neglecting some impedance in the zero-sequence circuit loop. It seems that the AC side of MMC2 has a grounding fault in phase C.…”

Section: Characteristic Analysis Of Single-phase Grounding Faultmentioning

confidence: 99%

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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: Characteristic Analysis Of Single-phase Grounding Faultmentioning

confidence: 89%

Section: System Connection Form and Mathematical Modelmentioning

confidence: 99%

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

Xu¹,

Huang²,

Lu³

et al. 2022

Applied Sciences

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“…Eq. (28) shows that the average powers of UPP and LOW CLs combined are equal and opposite to the average power of the MID CL. This means that when moving away from the sweet-spot, according to Eqs.…”

Section: Energy Managementmentioning

confidence: 96%

A Switched Mid-Point Modular Multilevel Converter for HVDC Applications

Hassan

Watson

Tardelli

et al. 2023

IEEE Trans. Power Delivery

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The modular multilevel converter (MMC) has emerged as the industry standard for voltage source converters (VSC) based high voltage direct-current (HVDC) applications since its benefits of scalability, modularity, high efficiency and better output quality outweigh its drawback of large energy storage. However, with a growing number of offshore HVDC installations, the volume and footprint of the converter, which are largely influenced by its energy storage, are becoming increasingly critical. This has led to a rising interest in alternative converter topologies that reduce the energy storage while maintaining the benefits of the MMC. This paper introduces a switched mid-point modular multilevel converter (SMPC), that is able to generate the desired AC-side waveforms with significantly less energy storage (around 50%) than the MMC. The DC-side is free from any distortion that requires additional filtering. Reduced energy storage and the associated reduction in volume is achieved at the expense of requiring more switches and slightly lower efficiency when compared to the MMC. Like many other MMC-style circuits, except when operating at a 'sweet-spot', active control of the energy balance is needed, for which a technique based on second harmonic injection is proposed. The converter operation and the proposed control scheme are verified by simulations for a medium-voltage setup and experimentally on a low-voltage labscale prototype.

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“…Consequently, such reality pushes the enhancement of innovative power electronics converters, where the power quality constraints and the efficiency are topics that are assuming a special preponderance. Therefore, due to the innumerous applications where power converters are used, new topologies and control algorithms are constantly emerging, as presented in [5], [6], and [7]. Among all applications of power converters, a distinct relevance is given to power factor correction (PFC) rectifiers due to power quality concerns.…”

Section: Introductionmentioning

confidence: 99%

A Novel Multilevel Interleaved-Based PFC Rectifier with Modular DC Interfaces

Monteiro

Afonso

2021

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society

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As it has been recognized, mainly over the last decades, PFC rectifiers are more and more fundamental and are increasingly present in several applications in the perspective of limiting power quality problems. In line with this reality, this paper proposes a novel topology of single-phase PFC rectifier. On the AC-side, the proposed PFC rectifier operates with sinusoidal current in phase with the voltage, but, additionally, it presents these very important advantages: Multilevel voltage operation; Interleaved-based current control; Modular design, allowing to establish n DC interfaces on the DC-side. The proposed PFC rectifier is comprehensively detailed, and the validation is carried out with a configuration that allows to have two independent DC interfaces, resulting in an operation with five different voltage levels, and in a current control with a ripple with a frequency that corresponds to four times the value of the switching frequency of each switching device. The validation was carried out addressing the operation of the proposed PFC rectifier in steady-state and transient-state.

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Control and Derived Topologies of Parallel Hybrid Converter

Cited by 19 publications

References 68 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

A Switched Mid-Point Modular Multilevel Converter for HVDC Applications

A Novel Multilevel Interleaved-Based PFC Rectifier with Modular DC Interfaces

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