Back-to-back MVDC link for distribution system active connection: A network study

Chiandone, Massimiliano; Sulligoi, Giorgio; Milano, Federico; Piccoli, Gabriele; Mania, P.

doi:10.1109/icrera.2014.7016536

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…Table I summarizes the parameters of the 16 MVA direct MMC used as a power-flow controller between two three-phase feeders of 11 kV and 50Hz. The nominal voltage of each arm was selected to allow operation at the worst condition, which is when the systems have a phase shift ∆θ = 60 • , causing some arms to have to provide a maximum voltage of 18 kV between lines, as is calculated in (10).…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Several power converter topologies can be used for powerflow-control in 11 kV feeders, as the back-to-back twolevel inverter, the back-to-back modular multilevel converter (MMC) or the Direct MMC. The conventional two-level inverter is the most mature technology but requires IGBTs connected in series, has high switching power losses, generates a high Total Harmonic Distortion (THD), and does not have fault tolerant operation [10]. The MMC is a promising technology for HVDC transmission, presents high efficiency, fault tolerant operation and low THD, but it has a big footprint, high cost and has not been applied in distribution networks, so a more in-depth study is required [11]- [15].…”

Section: Introductionmentioning

confidence: 99%

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Direct Modular Multilevel Converter With Six Branches for Flexible Distribution Networks

Pereda

Green

2016

IEEE Trans. Power Delivery

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This paper presents a complete analysis of a direct ac-to-ac modular multilevel converter (direct MMC) applied in medium voltage distribution networks through the soft-openpoint concept. The direct MMC is capable of bidirectional power flow between two feeders at any power factor, even when the feeders have different nominal voltages and operate with a phase shift angle or unbalanced voltages. The converter has six branches, each one composed of full H-bridges cells connected in series to generate a multilevel voltage waveform, to share the blocking voltage of the power switches and to have fault tolerant operation.This paper presents a suitable control scheme and provides a discussion about the capabilities and limitations of the converter, the capacitor voltage balance control, the efficiency and the power loss mitigation at various operation points. Simulation results and power loss calculations are presented for a threephase 11 kV 16 MVA direct MMC with 10 H-bridge cells per branch. The direct MMC is simulated in a distribution network to demonstrate the features of the converter and control under various operation conditions, including grid faults. Index Terms-Direct power conversion, AC-AC power converters, matrix modular multilevel converters, soft open point (SOPs), power-flow controller, grid connected converters.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct Modular Multilevel Converter With Six Branches for Flexible Distribution Networks

Pereda

Green

2016

IEEE Trans. Power Delivery

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“…On the other hand, Modular Multilevel Converter topologies have been proposed for MV and HV applications such as HVDC transmission, fractional frequency transmission systems [11], [12] and MV motor drives since they have high modularity, reliability and efficiency [13]. The use of MMC in distribution networks is scarce and implemented as B2B-MMC to connect feeders of the same voltage [14] or as hexverter in direct ac-ac configuration [15]. Both converters are promising and can deal with faults and unbalance voltages.…”

Section: Introductionmentioning

confidence: 99%

Modular Multilevel Matrix Converter as Solid State Transformer for Medium and High Voltage AC Substations

Bravo

Pereda

Merlin

et al. 2022

IEEE Trans. Power Delivery

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The use of power converters as solid state transformers is an attractive solution to modernize the power network, but this solution has not been fully addressed for MV and HV substations. This paper presents a customized and simple control for the Modular Multilevel Matrix Converter (M3C), specially conceived for its operation on synchronous ports, which is the case of AC substations. The control allows bidirectional power transfer, generation/absorption of reactive power and provisions of ancillary services. The converter is compared to the back-toback Modular Multilevel Converter (B2B-MMC) where the key performance indicators to carry out the comparison are power efficiency, number of semiconductor devices, passive components required, footprint, voltage cell balance, fault blocking capability and stress of components. The simulation results show the features, performance and attractiveness of the M3C topology in a 33/11 kV, 16 MW substation under different operating conditions, including grid faults and dynamic operation. The M3C presents similar efficiency and performance than the B2B-MMC, but it uses fewer semiconductor devices, passive components and total cell capacitor energy than the B2B-MMC, reducing cost and footprint. The experimental results show the performance of the M3C under less ideal conditions including a substation transformer saturation and power step response.

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“…Further research work is needed for other OPF algorithms with an AC network model. A supplementary damping controller for a UPFC had been proposed in [8].…”

Section: Introductionmentioning

confidence: 99%

Active and Reactive Power Control in Transmission Line with PSO Optimized PI controlled Five Level UPFC

Jayachandra¹,

Das²

2022

IJRASET

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In this paper, particle swarm optimization (PSO) optimized PI controlled five level UPFC is proposed for a double circuit transmission line. To enhance UPFC performance, a different approach is considered here. It uses simplified power system models to derive the decoupled power controllers, but detailed modeling of the UPFC power converters improves their ride-through capability. This paper introduces decoupled linear UPFC power controllers to obtain the reference ac voltages and currents for the two back-to-back-connected three-phase five-level NPC converters that enforce active and reactive power control in the transmission line. This paper proposes three main contributions to increase the dc-link voltage steadiness of multilevel UPFCs under line faults: 1) decoupled active and reactive linear power controllers; 2) real-time PWM generation; and 3) balancing of dc capacitor voltages. The MATLAB/SIMULINK model for the proposed circuit with PSO-optimized PI controlled five level UPFC is shown here with the results.

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Back-to-back MVDC link for distribution system active connection: A network study

Cited by 8 publications

References 24 publications

Direct Modular Multilevel Converter With Six Branches for Flexible Distribution Networks

Direct Modular Multilevel Converter With Six Branches for Flexible Distribution Networks

Modular Multilevel Matrix Converter as Solid State Transformer for Medium and High Voltage AC Substations

Active and Reactive Power Control in Transmission Line with PSO Optimized PI controlled Five Level UPFC

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