EMTP Model of a Bidirectional Cascaded Multilevel Solid State Transformer for Distribution System Studies

Martin-Arnedo, J.; González-Molina, F.; Martínez-Velasco, Juan A.; Adabi, M. Ebrahim

doi:10.3390/en10040521

Cited by 9 publications

(8 citation statements)

References 30 publications

(72 reference statements)

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“…In recent years, many feasible control strategies have been proposed to balance CHBR dc-link voltage [19][20][21][22][23][24][25][26], which can be classified into two categories. The first category refers to adopting advanced modulation techniques to balance CHBR dc-link voltage.…”

Section: Literature Reviewmentioning

confidence: 99%

“…It seems to many scholars that closed loop control is preferable to the first category. As mentioned in [22,23], the closed loop regulation of an active duty cycle of all H-bridges can lead to the balance of CHBR dc-link voltage. The voltage-balancing controller (VBC) proposed in [24,25] aims to balance CHBR dc-link voltage by using closed loop control to modify the active duty cycle of any N-1 CHBR module.…”

Section: Literature Reviewmentioning

confidence: 99%

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A Novel Control Strategy for DC-Link Voltage Balance and Reactive Power Equilibrium of a Single-Phase Cascaded H-Bridge Rectifier

Luo

Huang

et al. 2018

Energies

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The dc-link voltage balance and reactive power equilibrium of the cascaded H-bridge rectifier (CHBR) are the prerequisites for the safe and stable operation of the system. However, the conventional PI (Proportional-Integral) control strategy only puts emphasis on the CHBR dc-link voltage balance without taking into account its reactive power equilibrium under capacitive and inductive working conditions. For this reason, this paper has proposed a novel control strategy for the CHBR that can not only balance dc-link voltage, but also achieve reactive power equilibrium and eliminate the coupling effect between the voltage-balancing controller (VBC) and original system controller (OSC). The control strategy can achieve dc-link voltage balance and the reactive power equilibrium of the CHBR through modifying the active duty cycle by closed loop control, and adjusting the reactive duty cycle relatively according to the modifiable amount of the active duty cycle. Moreover, the strategy can eliminate the coupling effect between the VBC and OSC by the open loop control modification of the active and reactive duty cycle of any H-bridge module in CHBR. Simulations and experiments have shown that the proposed control strategy is feasible and effective in performing the CHBR dc-link voltage balance and reactive power equilibrium under all working conditions and load variations.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

A Novel Control Strategy for DC-Link Voltage Balance and Reactive Power Equilibrium of a Single-Phase Cascaded H-Bridge Rectifier

Luo

Huang

et al. 2018

Energies

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“…Nevertheless, using full rated converters, usually located after or before the DT as a standalone device, yields high losses for switching and conduction as well as requiring high maintenance. In order to bridge this research gap, several works have been published in the literature proposing to perform VAr compensation [18][19][20], voltage regulation [21,22], or even both [23,24] using reduced ratings for the SSS. In particular, the so-called hybrid distribution transformer (HT) [25][26][27], which consists of using an embedded fractional rated converter partially attached to the windings of the DT, has been widely used [19,20,23,24,28].…”

Section: Introductionmentioning

confidence: 99%

Control Configurations for Reactive Power Compensation at the Secondary Side of the Low Voltage Substation by Using Hybrid Transformer

et al. 2021

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The high penetration of new device technologies, such as Electric Vehicles (EV), and Distributed Generation (DG) in Distribution Networks (DNs) has risen new consumption requirements. In this context, it becomes crucial to implement a flexible, functional and fast responsive management of the voltage level and Reactive Power (RP) in the DN. The latest improvements in the Solid State Switches (SSS) field demonstrate they can be used as a Power Electronic (PE) converter. In particular, they have been shown to be capable of operating synchronously with transformers, making the Hybrid Distribution Transformer (HT) concept a potential and cost-effective solution to various DN control issues. In this paper, a HT-based approach consisting of augmenting the conventional Low Voltage (LV) transformer with a fractionally rated PE converter for regulating and controlling the RP in the last mile of the DN is proposed. In this way, it is expected to meet the demand of the future DN from an efficiency, controllability and volume perspective. The proposed approach is implemented using a back-to-back converter. In addition, a power transfer control topology is used to implement the proposed control of the RP injection that controls the voltage level at the Direct Current (DC) link. The proposed approach has been demonstrated in different load scenarios using the Piecewise Linear Electrical Circuit Simulation (PLECS) tool. The simulation results show that the proposed approach can compensate the loads with their need from RP instead of feeding them from the transmission grid at the primary side of the Distribution Transformer (DT). In this way, the proposed approach is able to decrease the transferred amount of RP in the transmission lines.

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“…Høidalen, Norway). The proposed reclosing scheme was implemented using EMTP/MODELS [24,25]. The sampling frequency was 120 samples/cycle.…”

Section: System Model and Implementation Of The Proposed Methodsmentioning

confidence: 99%

New Adaptive Reclosing Technique in Unbalanced Distribution System

Seo¹

2017

Energies

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Abstract:The conventional reclosing of a distribution system is performed after a fixed dead time. However, it may lead to the increased outage time due to delayed reclosing. To solve this problem, this paper proposes a new adaptive reclosing scheme. The electrostatic induction is analyzed under at during-fault and post-fault conditions. Based on this analysis, the method to judge the fault clearance using the load current is proposed. The reclosing is adaptively performed after fault clearance. The distribution system and reclosing scheme are modelled by the electromagnetic transient program (EMTP). The various simulations according to the unbalanced ratio and various fault conditions are performed and analyzed. The superiority of the proposed scheme is verified by comparing with the conventional reclosing method.

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EMTP Model of a Bidirectional Cascaded Multilevel Solid State Transformer for Distribution System Studies

Cited by 9 publications

References 30 publications

A Novel Control Strategy for DC-Link Voltage Balance and Reactive Power Equilibrium of a Single-Phase Cascaded H-Bridge Rectifier

A Novel Control Strategy for DC-Link Voltage Balance and Reactive Power Equilibrium of a Single-Phase Cascaded H-Bridge Rectifier

Control Configurations for Reactive Power Compensation at the Secondary Side of the Low Voltage Substation by Using Hybrid Transformer

New Adaptive Reclosing Technique in Unbalanced Distribution System

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