A New High-Frequency AC Link Three-Phase Four-Wire Power Electronic Transformer

Ai-juan, Jin; Hang-tian, Li; Li, Shaolong

doi:10.1109/iciea.2006.257354

Cited by 21 publications

(4 citation statements)

References 3 publications

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“…Adding intelligent features to transformers are under development [2]. Less attention is paid to the areas of the circuit topologies [3,4]. Sabahi et al [5] proposed a new modular flexible power electronic transformer (FPET).…”

Section: Introductionmentioning

confidence: 99%

Application of SRF Algorithm and SVPDM Concept in Power Electronic Transformer

Prakash

Kumar

2014

Lecture Notes in Electrical Engineering

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Increasing power demand, carbon emission from fossil fuel based generation, depletion of resources, unreliability of power system, poor power quality, low energy efficiency, high transmission losses are the driving factors to move towards smart grid. Smart grid is the integration of electrical grid with information and communication technology and comprises of several micro grid. The micro grids are integrated with main utility grid at point of common coupling using transformers. Such transformer should be of small size for indoor substations. The transformers should have features like bidirectional power flow, real and reactive power flow control and power quality control. Power electronic transformers (PET) are best suited for this application. This paper deals with matrix converter based power electronic transformer which has three phase matrix converter, STATCOM, bilateral converter, dc link capacitor, and voltage source inverter. The main problems of matrix converter based transformers are low input power factor and harmonics. Input power factor and input current harmonic problems are rectified by adding a STATCOM at the input side of matrix converter. Novel space vector based pulse density modulation is designed to obtain harmonic free output voltage in output side of PET. Additionally, the proposed PET performs typical functions and has advantages such as voltage regulation, voltage sag and swell elimination and voltage flicker mitigation. In addition, it has other benefits such as bidirectional power flow, light weight, low volume and no toxic dielectric coolants. Performance of the proposed power electronic transformer is validated by simulation studies.

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Section: Introductionmentioning

confidence: 99%

Application of SRF Algorithm and SVPDM Concept in Power Electronic Transformer

Prakash

Kumar

2014

Lecture Notes in Electrical Engineering

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“…This not only increases the cost of the system, but also its practicality is limited by the adjustment accuracy. Aijuan adopted a three-dimensional space vector PWM (3D-SVPWM) control strategy to maintain low harmonic distortion of the output voltage under a variable unbalanced load [14]. However, the concept of three-dimensional space vector is introduced into this method, which is more complex in both control and implementation method.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Pulse Width Modulation Strategy of a High-Frequency Link Three-Phase Four-Leg Matrix Converter Based on Compensation Theory

Wang

Pan

et al. 2019

Applied Sciences

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A high-frequency link (HFL) three-phase four-leg matrix converter (MC) can output three-phase balanced voltage for unbalanced load conditions. It is an inverter with great development potential. This paper presents a hybrid pulse width modulation (HPWM) strategy for a four-wire matrix converter based on the fourth bridge leg compensation method. Firstly, the rear-stage topology of a high-frequency link three-phase four-leg matrix converter is decoupled into two sets of ordinary three-phase four-wire inverters. Then the compensation strategy is applied to separate the fourth bridge leg from the coupling of the ordinary inverter and realize its independent control. Under the theory of compensation, the fourth bridge leg plays a role in compensating the deviation of the neutral point potential when the load is unbalanced, the fourth bridge leg does not need to work when the load is balanced. Finally, the fourth bridge leg modulation wave obtained by the compensation method is combined with the front three bridge leg modulation waves to perform the coupling control using the hybrid pulse width modulation strategy. It has changed the problem that the previous hybrid pulse width modulation strategy cannot be directly applied to the four-wire matrix converter. This strategy is simple to control, without adding any auxiliary commutation detection circuitry, can effectively solve the inherent commutation problem in the bidirectional switch tube of the four-wire matrix converter. It simplifies the complexity of the system, reduced control cost, and high switching loss caused by high switching frequency. The fast adjustment function of compensation strategy makes the dynamic response performance of system under load fluctuation state more prominent, the harmonic distortion rate is smaller. The perfect combination of two strategies allows the high-frequency link three-phase four-leg matrix converter with any form of load to give full play to its structural advantages. The related work verifies the feasibility and effectiveness of the modulation method and control logic.

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“…The previous researches show that PETs have a great capacity to receive much more attention due to their merits such as high frequency link transformation and flexible regulation of the voltage and power. Although many studies have been conducted on application and control of PET in power systems [1]- [8], less attention is paid to the areas of the circuit topologies [7] and [8]. The topology of PET can be developed in such a way to achieve mult iport electrical system that converts variable input waveform to the desired output waveform.…”

mentioning

confidence: 99%

Modeling of Modular Based Flexible Power Electronic Transformer

2015

IJAERD

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-In this paper, a new topology proposes power electronic transformer. The power electronic transformer is a solid state transformer which replace conventional transformer. The conventional transformer has a many disadvantages such as heavy weight, large size, require toxic dielectric coolant, voltage drop under load, sensitivity to harmonics. These disadvantages are becoming compulsory for power quality improvement.To overcome the disadvantages power electronics transformer is good option for reduce it. Power electronic transformer provides a fundamentally different and more complete approach in transformer desine by using power electronics on primary and secondary side of transformer. It has a bidirectional power flow capability and voltage regulation. The main feature of this PET is the independent operation of modules each of which contains one port. Each port can be considered as input or output, because bidirectional power flow is provided. The modules are connected to common dc link that facilitates to energy transfer among modules as well as port.

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A New High-Frequency AC Link Three-Phase Four-Wire Power Electronic Transformer

Cited by 21 publications

References 3 publications

Application of SRF Algorithm and SVPDM Concept in Power Electronic Transformer

Application of SRF Algorithm and SVPDM Concept in Power Electronic Transformer

Hybrid Pulse Width Modulation Strategy of a High-Frequency Link Three-Phase Four-Leg Matrix Converter Based on Compensation Theory

Modeling of Modular Based Flexible Power Electronic Transformer

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