A Comprehensive Harmonic Analysis and Control Strategy for Improved Input Power Quality in a Cascaded Modular Solid State Transformer

Gorla, Naga Brahmendra Yadav; Kolluri, Sandeep; Chai, Merlin; Panda, Sanjib Kumar

doi:10.1109/tpel.2018.2873201

Cited by 50 publications

(7 citation statements)

References 43 publications

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“…It is necessary to balance the DC bus voltages, either voltage balance control in stage 1 or power balance control in stage 2. In Reference 111, the condition of CMSST input power quality in the presence of voltage and power balance control methods is investigated. The results show that the implementation of voltage balance controllers in stage 1 introduces additional switching harmonics other than the inevitable switching harmonics of multilevel rectifiers.…”

Section: Solid‐state Transformer Applicationsmentioning

confidence: 99%

Solid‐state transformers: An overview of the concept, topology, and its applications in the smart grid

Shadfar

Pashakolaei

Foroud

2021

Int Trans Electr Energ Syst

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The development of power systems and the move to smart grid have increased the need for new technologies. In this regard, solid-state transformers have been proposed as a suitable alternative to conventional transformers. Solidstate transformers are among the equipment based on power electronic converters that in addition to better performance than conventional transformers provide a variety of other services. In this article, the concept and types of solid-state transformer topologies and configurations and their applications, especially in smart grid, are investigated. Studies show that the various characteristics of solid-state transformers have led to much consideration as potential transformers in smart grid applications, the integration of distributed generation sources, modern traction systems, and so on.

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Section: Solid‐state Transformer Applicationsmentioning

confidence: 99%

Solid‐state transformers: An overview of the concept, topology, and its applications in the smart grid

Shadfar

Pashakolaei

Foroud

2021

Int Trans Electr Energ Syst

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“…Grid-connected converter is usually intended to perform the control of the grid current, the total DC-link voltage control and the DC-link voltage balancing control [18], [20], [21]. For this purpose, the typical control scheme has three control loops as shown in Fig.…”

Section: Conventional Dc-link Voltage Balancing Algorithmmentioning

confidence: 99%

DC-Link Voltage Balancing Modulation for Cascaded H-Bridge Converters

Tcai

Liserre

2021

IEEE Access

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Cascaded H-Bridge (CHB) converters have been widely employed in various applications, providing the advantages of modularity and multilevel voltage output. However, technically the CHB converters require isolated DC-link buses, which need to be regulated individually. In this context, a control scheme for the CHB converters features the voltage balancing algorithm. The voltage balancing control is typically performed by PI controller, where its control capability is limited by linear modulation region. In this work, the modulation based voltage balancing algorithm is proposed, which extends the balancing control capability and improves the dynamic performance. The proposed method is theoretically analyzed and validated through the simulation and experimental results. INDEX TERMS Multilevel converter, Cascaded-H bridge converter, DC-link voltage balancing, Modulation.

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“…The SSTs not only do not transmit the unbalanced currents from the low‐voltage output loads but also can improve the voltage unbalance condition of the medium‐voltage (MV) grid by injecting a proper negative sequence (ns) current. In other words, The SSTs can improve the voltage unbalance factor (VUF) of a point of common coupling (PCC) in the MV grids like an active filter [13]. The voltage unbalance conditions or the ns current injection create unbalanced currents in the different phases of the SST first stage converters, which lead to some problems.…”

Section: Introductionmentioning

confidence: 99%

Flexible control for power‐sharing in the CHB‐based SST under voltage unbalance conditions

Babaei

Ghandehari

2021

IET Power Electronics

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Solid-state transformers (SSTs) have flexible capabilities to improve the power quality issues. These improvements impose disturbances into the SST converters that require proper control algorithms. In this paper, the problems of the unequal active power flow in different phases of the SST due to the grid voltage unbalance conditions and the negative sequence current injection are discussed, and an effective method is proposed to equally sharing the active powers between the SST clusters by creating an optimum zero sequence current. Based on the power dependencies, an analytical vector for the zero-sequence current is proposed, which can equally share the power among the SST clusters and balance the HVDC-link voltages. Also, the proposed control strategy by using PIR controllers can achieve the zero-sequence current based on a direct current control method. The provided equal power-sharing among the clusters is kept in the considerable unbalanced voltage of the grid and prevents the SST outage during faults. The simulation and experimental results confirm the proposed control method to equalise the power-sharing among the SST clusters and voltage equalisation of the HVDC-links while the SST tries to improve the grid voltage unbalance and in the fault conditions of the grid.

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A Comprehensive Harmonic Analysis and Control Strategy for Improved Input Power Quality in a Cascaded Modular Solid State Transformer

Cited by 50 publications

References 43 publications

Solid‐state transformers: An overview of the concept, topology, and its applications in the smart grid

Solid‐state transformers: An overview of the concept, topology, and its applications in the smart grid

DC-Link Voltage Balancing Modulation for Cascaded H-Bridge Converters

Flexible control for power‐sharing in the CHB‐based SST under voltage unbalance conditions

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