Research on voltage and power balance control for cascaded modular solid-state transformer

Shi, Jimin; Gou, Wei; Yuan, Hao; Zhao, Tiefu; Huang, Alex Q.

doi:10.1109/tpel.2011.2106803

Cited by 332 publications

(124 citation statements)

References 29 publications

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“…Similar double-loop structure has also recently been recommended for DAB converter used in solid-state transformers [24 -26]. Alternatively and much earlier than [24], a single DC-link voltage loop has been used for generating the desired phase shift needed by the DAB converter. Differences between the single-and double-loop structures are well-established in control theory, and hence not further discussed.…”

Section: A Dab Modeling and Controlmentioning

confidence: 99%

“…7 shows the DAB converter regulating the common DClink voltage, and the inverter regulating the overall power flow. PI controllers used with the DAB converter are therefore for removing the outer DC-link voltage error [21] and improving the inner current tracking performance [24]. On the other hand, PI controllers used with the inverter are for removing d-q current or power tracking errors.…”

Section: Control Of Cascaded Convertermentioning

confidence: 99%

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DC-Link Voltage Coordinated-Proportional Control for Cascaded Converter With Zero Steady-State Error and Reduced System Type

Tian

Loh

Deng

et al. 2016

IEEE Trans. Power Electron.

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Abstract-Cascaded converter is formed by connecting two subconverters together, sharing a common intermediate DC-link voltage. Regulation of this DC-link voltage is frequently realized with a Proportional-Integral (PI) controller, whose high gain at DC helps to force a zero steady-state tracking error. Such precise tracking is however at the expense of increasing the system type, caused by the extra pole at the origin introduced by the PI controller. The overall system may hence be tougher to control. To reduce the system type while preserving precise DC-link voltage tracking, this paper proposes a coordinated control scheme for the cascaded converter, which uses only a proportional DC-link voltage regulator. The resulting converter is thus dynamically faster, and when compared with the conventional PI-controlled converter, it is less affected by impedance interaction between its two sub-converters. The proposed scheme can be used with either unidirectional or bidirectional power flow, and has been verified by simulation and experimental results presented in the paper.

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Section: A Dab Modeling and Controlmentioning

confidence: 99%

Section: Control Of Cascaded Convertermentioning

confidence: 99%

DC-Link Voltage Coordinated-Proportional Control for Cascaded Converter With Zero Steady-State Error and Reduced System Type

Tian

Loh

Deng

et al. 2016

IEEE Trans. Power Electron.

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“…With the development of semi-conductor technologies, the cost of power electronic devices will become lower and lower. In the literatures, many topologies and techniques based on the H-Bridge discussed the elimination of the low frequency transformer [53]- [56].…”

Section: Low Size Weight and Costmentioning

confidence: 99%

A Modular Bi-Directional Power Electronic Transformer

Gao¹,

Fan²

2016

Journal of Power Electronics

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This paper presents a topology for a modular power electronic transformer (PET) and a control scheme. The proposed PET consists of a cascaded H-Bridge rectifier on the primary side, a high-frequency DC/DC conversion cell in the center, and a cascaded H-Bridge inverter on the secondary side. It is practical to use PETs in power systems to reduce the cost, weight and size. A detailed analysis of the structure is carried out by using equivalent circuit. An algorithm to control the voltages of each capacitor and to maintain the power flow in the PET is established. The merits are analyzed and verified in theory, including the bi-directional power flow, variable voltage/frequency and high power factor on the primary side. The experimental results validated the propose structure and algorithm.

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“…Several modular isolated bidirectional dc-dc converters have been reported in the literature [3][4][5][6][7][8][9][10][11]. Most of them have been designed for a specific application and some of them have focused on developing control techniques to achieve equal input voltage and output current sharing and improve the dynamic performance.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of a modular isolated bidirectional dc-dc converter for high power applications

Sedaghati¹,

Hosseini

Sabahi³

et al. 2016

Turk J Elec Eng & Comp Sci

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Abstract:A new configuration for modular isolated bidirectional dc-dc converters is presented. The proposed converter has interesting features such as fewer switching devices, bidirectional power flow, and low switching losses. The simple modular structure, high frequency operation, zero voltage switching (ZVS) capability, and fewer switching devices make the extended configuration of the proposed converter suitable for high power applications. The operation principle of the proposed converter is analyzed in steady state, and then ZVS analysis of the converter is presented in detail. A generalized averaging technique, which uses dc and first order terms of Fourier's series of state variables, is applied to model the converter. A small-signal average model is developed to obtain the control-to-output transfer function of the converter. In order to obtain acceptable dynamic response, closed-loop control of the converter using a PID controller is studied. Finally, measurement and simulation results are presented to verify the operation principles of the converter and effectiveness of the PID controller.

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Research on voltage and power balance control for cascaded modular solid-state transformer

Cited by 332 publications

References 29 publications

DC-Link Voltage Coordinated-Proportional Control for Cascaded Converter With Zero Steady-State Error and Reduced System Type

DC-Link Voltage Coordinated-Proportional Control for Cascaded Converter With Zero Steady-State Error and Reduced System Type

A Modular Bi-Directional Power Electronic Transformer

Dynamic analysis of a modular isolated bidirectional dc-dc converter for high power applications

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