Dynamic Modeling and Closed-Loop Control of a Solid-State Transformer (SST) Based on Series Resonant Converter (SRC)

Bhawal, Shekhar; Chakraborty, Surja Sekhar; Hatua, Kamalesh

doi:10.1109/jestpe.2021.3088238

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…Control Hierarchical Architecture Description [26] Presence None None [27] Presence None None [28] None None Presence [29] None None Presence [30] Presence None Presence [31] Presence None Partially presence (without a balancing control) Unlike [26,27], Ref. [28] presents a control hierarchical architecture.…”

Section: Communication Structure Descriptionmentioning

confidence: 99%

“…Similarly, Ref. [29] shows a control hierarchical architecture. The control process of [27] is presented in detail compared to [28].…”

Section: Communication Structure Descriptionmentioning

confidence: 99%

“…However, Ref. [29] also required an explanation of the communication structure and the control sequence. Refs.…”

Section: Communication Structure Descriptionmentioning

confidence: 99%

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A Study on the Distributed-Control Architecture of a DSP-Based Solid-State Transformer System with Implementation

Ju,

Choi,

Lee

2023

Energies

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This article proposes a Distributed-control Architecture (D-CA) and an operation sequence with start-up strategies for a Digital Signal Processor (DSP)-based Solid-State Transformer (SST). Although various control techniques for SSTs have been reported in earlier studies, there is still a lack of research covering comprehensive content, including hierarchical control architectures and operation sequences with start-ups considering the implementation of DSPs. Therefore, this article addresses the following factors of SST. First, the D-CA is described for the design of the hierarchy between control boards. With the D-CA, because sub-boards are in charge of their corresponding DC-link voltage balancing control individually, the computational burden on the master board can be reduced. Second, the operation sequence of the SST system is explained based on the SST with D-CA. The step of DC-link voltage balance is considered throughout the entire operation sequence for safe driving. Furthermore, the PWM start-up strategies for a Cascade H-bridge Multilevel (CHM) converter and Dual Active Bridge (DAB) converter are proposed to prevent switching pulse errors caused by DSP operating characteristics. These start-up strategies reduce the current surges. The validity of the proposed D-CA and operation sequence with start-up strategies are verified by experimental results.

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Section: Communication Structure Descriptionmentioning

confidence: 99%

“…Similarly, Ref. [29] shows a control hierarchical architecture. The control process of [27] is presented in detail compared to [28].…”

Section: Communication Structure Descriptionmentioning

confidence: 99%

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A Study on the Distributed-Control Architecture of a DSP-Based Solid-State Transformer System with Implementation

Ju,

Choi,

Lee

2023

Energies

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Improved linear active disturbance rejection control for double active bridge series resonant converter with high voltage gain

Li,

Zhan,

Yang

et al. 2024

Circuit Theory & Apps

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The double active bridge series resonant converter (DABSRC) has become a research hotspot in both scientific and engineering fields due to its high efficiency and high voltage gain characteristics demonstrated in energy storage systems and smart grid systems. In this paper, an improved linear active disturbance rejection control (LADRC) algorithm is proposed to improve the dynamic response performance of the DABSRC. Compared to the existing LADRC algorithms, the primary enhancements of the proposed LADRC involve optimizing the feedback control law and the introduction of error proportion in the linear extended state observer (LESO). These modifications effectively reduced the estimation error of perturbation of the LESO and consequently enhanced the stability and dynamic response performance of the converter. In the paper, simulations and experiments are conducted to investigate the performances of a DABSRC by using three different control strategies, that is, the PI controller, the traditional LADRC, and the improved LADRC proposed in this paper. The experimental results proved the feasibility and correctness of the improved LADRC strategy. The proposed algorithm is not only applicable to the DABSRC but also suitable for other converters to improve the dynamic response performance.

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DC fault analysis of solid‐state transformer using circuit equivalent

Kamble,

Chaturvedi,

Borghate

et al. 2024

Circuit Theory & Apps

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The use of power converters in modern power systems is making the system more active. To enhance the future power grid's reliability, efficiency, interactivity, and security, digital controllers and power electronic circuits are being employed. One critical component of the power system is the 50‐Hz transformer, which is currently robust. However, there is growing interest in solid‐state transformers (SSTs) or power electronic transformers (PETs) as potential alternatives to conventional transformers. These alternatives are particularly relevant for the future grid, which will have a high penetration of renewable energy sources, electric vehicles, and nonlinear loads. To analyze the impact of faults in the power network, it is necessary to establish an accurate circuit model for SSTs, which has not been adequately addressed in the existing literature. This research paper proposes an averaged representation of SSTs and compares the results of switched and averaged models under varying load conditions for the designed SST. Additionally, an equivalent circuit model is developed for DC fault analysis using transformation techniques and a transformer analogy to shift parameters to the DC fault location. The proposed circuit equivalent model is compared with the switched model, offering accurate and efficient results for a pole‐to‐pole and pole‐to‐ground DC fault.

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Dynamic Modeling and Closed-Loop Control of a Solid-State Transformer (SST) Based on Series Resonant Converter (SRC)

Cited by 9 publications

References 27 publications

A Study on the Distributed-Control Architecture of a DSP-Based Solid-State Transformer System with Implementation

A Study on the Distributed-Control Architecture of a DSP-Based Solid-State Transformer System with Implementation

Improved linear active disturbance rejection control for double active bridge series resonant converter with high voltage gain

DC fault analysis of solid‐state transformer using circuit equivalent

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