Field upgradeable transformer: A fractionally-rated voltage regulator for the distribution system

Kandula, Rajendra Prasad; Chen, Hao; Prasai, Anish; Lambert, Frank; Schatz, Joe; Divan, Deepak

doi:10.1109/ecce.2016.7855116

Cited by 9 publications

(10 citation statements)

References 9 publications

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“…The rating of the converter can be designed to be lower than the rating of the load. On e stage AHSST structure that is studied in [14][15][16][17][18] consists of AC/AC converter that is shown in Figure 3. The AC/AC converter controls the magnitude of the output voltage that is average value of the tap voltage to control primary side voltage of the tap transformer.…”

Section: Active Hybrid Solid State Transformermentioning

confidence: 99%

“…Since the voltage of the 2N tap is used as an input of converter, the voltage applied to the switch, becomes 2N tap so that the use of a high-voltage switch is forced. To overcome this disadvantage, a structure shown in Figure 4 has been studied in which each N tap are used independently [18].…”

Section: Of 15mentioning

confidence: 99%

“…Since the voltage of the 2 is used as an input of converter, the voltage applied to the switch , becomes 2 so that the use of a high-voltage switch is forced. To overcome this disadvantage, a structure shown in Figure 4 has been studied in which each are used independently [18]. This system structure is also composed of an AC/AC converter, but relays are added to select each tap voltage respectively according to boost or buck operation mode.…”

Section: Of 15mentioning

confidence: 99%

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Active Hybrid Solid State Transformer Based on Multi-Level Converter Using SiC MOSFET

Yun

Cho

2018

Energies

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As the types of loads have been diversified and demand has increased, conventional distribution transformers are difficult to maintain the constant voltage against voltage drop along with distance, grid voltage swell/sag, and various loads. Also, it is hard to control the power flow when connecting renewable energy sources. Active hybrid solid state transformer (AHSST) is application to keep the voltage and power quality. AHSST is a system that combines conventional distribution transformer and converter. Accordingly, it can be applied directly to distribution infrastructure and it has both the advantages of solid state transformer (SST) and conventional transformer. AHSST is capable of active voltage and current control and power factor control. It has a simpler structure than SST and it can perform the same performance with the lower rating converter. This paper presents two stage AHSST system based on multi-level converter. The converter is composed of the back-to-back converter using silicon carbide (SiC) metal-oxide semiconductor field effect transistor (MOSFET). Proposed system has a wider voltage and power flow control range, lower filter size, and simpler control sequence than existing AHSST systems. The performance of the proposed system was verified by prototype system experiments.

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Section: Active Hybrid Solid State Transformermentioning

confidence: 99%

Section: Of 15mentioning

confidence: 99%

Section: Of 15mentioning

confidence: 99%

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Active Hybrid Solid State Transformer Based on Multi-Level Converter Using SiC MOSFET

Yun

Cho

2018

Energies

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“…When the electronic module fails, the transformer retains basic passive transformer functionality. The converter is only fractionally-rated (5 kVA for 50 kVA unit), avoids direct fault current and is located near the ground potential to avoid BIL issues [42]. Hence, the converter contributes very little additional weight and loss for the system while achieving wide-range dynamic voltage control.…”

Section: B Flexible Field-upgradable Transformersmentioning

confidence: 99%

Distributed Power Electronics: An Enabler for the Future Grid

Divan¹,

Kandula²

2016

CPSS TPEA

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Rapidly decreasing prices for renewable energy, increasing industrialization and electrification of the global economy, and a worldwide focus on reducing carbon emissions, is causing a reexamination of the power system of the future. A reliance on centralized planning and control, scheduled and dispatched generation, and unidirectional power flows, allowed the design of a robust and scalable power system, that did not require dynamic controls infused into the grid. As a result, the existing grid, the most complex machine built by man, has been the driver of sustained global economic growth for well over a century. Increasing levels of variable and non-dispatchable renewable energy resources mixed into the grid, bidirectional power flows resulting from a dramatic increase in the number of prosumers ('producer + consumer'), are adding complexity, volatility and economic inefficiency to grid operations, making grid control with conventional centralized technologies very challenging. This paper looks at the role that distributed power electronics could play in the grid of the future, allowing a costeffective approach to grid control that can help achieve global objectives of operating with high renewable penetration.

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“…Additionally, the voltage gain is dependent on matching conditions. An MC is implemented on the primary side of a field upgradeable transformer in [12] for voltage control. The MC is responsible for the smooth and continuous character of voltage change, and buck and boost modes are obtained by mechanical switches with a range of ±5%.…”

Section: Introductionmentioning

confidence: 99%

Hybrid distribution transformer based on a bipolar direct AC/AC converter

Kaniewski

2018

IET Electric Power Applications

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Dynamic states in the power grid-deep voltage sags and swells, voltage fluctuation-can cause faults and defects in sensitive loads and in consequence financial losses. This study presents a voltage conditioner based on a direct PWM AC/AC converter with matrix chopper cooperating with a distribution transformer, called a hybrid distribution transformer (HDT). In comparison with other solutions of hybrid and smart distribution transformers, the proposed HDT is characterised by having a simple construction and small number of power electronic switches, a wide range and continuously variable voltage control character, and good dynamic properties, in combination with a high reliability. The study contains a detailed operational description and the experimental test results of a 1 kVA rated power laboratory model. The experimental tests were conducted in a closed control-loop with a peak detector unit in a feedback path, as well as with various types of voltage perturbation with linear and non-linear loads. In addition, some of the properties of the proposed HDT have been compared with other similar hybrid and smart distribution transformers described in the literature.

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Field upgradeable transformer: A fractionally-rated voltage regulator for the distribution system

Cited by 9 publications

References 9 publications

Active Hybrid Solid State Transformer Based on Multi-Level Converter Using SiC MOSFET

Active Hybrid Solid State Transformer Based on Multi-Level Converter Using SiC MOSFET

Distributed Power Electronics: An Enabler for the Future Grid

Hybrid distribution transformer based on a bipolar direct AC/AC converter

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