Solid state transformer with low-voltage ride-through and current unbalance management capabilities

Alepuz, Salvador; González, Francisco; Martin-Arnedo, J.; Martínez, J.A.

doi:10.1109/iecon.2013.6699316

Cited by 20 publications

(16 citation statements)

References 16 publications

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“…The proposed bidirectional SST design is based on the commonly accepted three-stage design [15][16][17][18]: (1) the input voltage at power frequency is first converted into dc voltage by the MV-side three-phase converter working as rectifier; (2) the isolation stage is implemented by means of a dual active bridge (DAB) dc-dc converter, with an intermediate high-frequency transformer that reduces the MV square waveform into a LV square waveform; (3) a low voltage (LV) three-phase dc/ac converter working as inverter provides the output power-frequency ac voltage to LV loads.…”

Section: Sst Configurationmentioning

confidence: 99%

“…The configuration selected for the basic cell is the single-phase DAB converter presented in [13,14], although the present model incorporates some changes in the control strategies and the MV-side design is three-phase, while the configuration used in [13,14] was single-phase. As for the LV side, it is based on the three-phase four-wire configuration and control strategy implemented by the authors in some previous works; see [15,17]. Figure 1a shows the configuration of the converter cell that would be the base of the modular design implemented in this work.…”

Section: Sst Configurationmentioning

confidence: 99%

“…Input stage: The control strategy for any single cell follows the principles used in some previous works, see [15,17]. The input stage is implemented by means of a multilevel converter; see, for instance [13,20].…”

Section: Switching Strategies and Control Descriptionmentioning

confidence: 99%

“…Isolation stage: The amount and direction of the active power flow between primary and secondary of each high-frequency transformer is according to the following expression [25] (see also [15][16][17]):…”

mentioning

confidence: 99%

“…The three-phase four-wire LV converter allows connecting loads and/or generators with either one, two or three phases. A Space Vector Modulation (SVM) PWM switching strategy has been used in the LV-side converter, see Figure 5 and references [15,17,26]. The main task of the LV-side converter controllers is to achieve positive-sequence capacitor voltages (i.e., to have balanced voltages at capacitor terminals) with stable frequency and voltage, independently of the power direction (i.e., load or generation) and the current balance.…”

mentioning

confidence: 99%

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

et al. 2017

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This paper presents a time-domain model of a MV/LV bidirectional solid state transformer (SST). A multilevel converter configuration of the SST MV side is obtained by cascading a single-phase cell made of the series connection of an H bridge and a dual active bridge (dc-dc converter); the aim is to configure a realistic SST design suitable for MV levels. A three-phase four-wire converter has been used for the LV side, allowing the connection of both load/generation. The SST model, including the corresponding controllers, has been built and encapsulated as a custom-made model in the ATP version of the EMTP for application in distribution system studies. Several case studies have been carried out in order to evaluate the behavior of the proposed SST design under different operating conditions and check its impact on power quality.

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Section: Sst Configurationmentioning

confidence: 99%

Section: Sst Configurationmentioning

confidence: 99%

Section: Switching Strategies and Control Descriptionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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

et al. 2017

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Modeling and control of a cascaded multilevel converter‐based electronic power transformer

Huang

Zhang

Mao

et al. 2016

IEEJ Transactions Elec Engng

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Control strategy of a cascaded multilevel converter based electrical power transformer (EPT) in a distribution system with capabilities of low voltage ride-through and unbalanced load current management is investigated in this study. The mathematical model and decoupled control schemes of the system, including a high-voltage side control scheme, an isolation-stage control scheme, and a low-voltage side control scheme, are presented in detail. A dual current control scheme is introduced to control both positive and negative sequence currents for enhancing the low voltage ride-through capability of the high-voltage side cascaded H-bridge converter. Positive, negative, and zero-sequence voltages are controlled for the low voltage side three-phase four-wire converter in the decoupled control scheme, respectively, for unbalanced load current management. A proportional resonant controller (PRC) is utilized to control the zero-sequence voltage, while the root locus method is applied in the PRC design. Three-dimensional space vector pulse width modulation (PWM) switching strategy is then used for the low voltage side converter. Simulation studies were conducted with MATLAB/Simulink to validate the coordinated control strategy.

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Modeling and simulation of a MMC-based solid-state transformer

2017

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This paper presents a model of a bidirectional MV/LV solid-state transformer (SST) for distribution system studies. A modular multilevel converter configuration is used in the MV side of the STT. The LV side uses a three-phase four-wire configuration that can be connected to both load and generation. The model developed for this work has been implemented in MATLAB/Simulink, and its behavior has been tested by carrying out several case studies under different operating conditions. The simulation results support the feasibility of the SST and its advantages in comparison to the conventional transformer. The paper also includes a discussion of the main model limitations and the future work.Postprint (published version

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Solid state transformer with low-voltage ride-through and current unbalance management capabilities

Cited by 20 publications

References 16 publications

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

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

Modeling and control of a cascaded multilevel converter‐based electronic power transformer

Modeling and simulation of a MMC-based solid-state transformer

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