Multi-frequency power transfer in a smart transformer based distribution grid

Bruske, Sebastian; Carne, Giovanni De; Liserre, Marco

doi:10.1109/iecon.2014.7049153

Cited by 26 publications

(9 citation statements)

References 30 publications

(23 reference statements)

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“…The solid-state transformer (SST) has been applied for traction purpose by ABB, SIEMENS, ALSTOM, due to the advantages of low volume and weight [21][22][23][24]. The smart transformer (ST) [27,28], instead, aims to provide ancillary services to the distribution grid [28][29][30][31][32], more than simply adapting the voltage level from MV to LV grids, like in the SST case. Compared to the HT, the ST is more flexible to offer frequency support, voltage control, reactive power compensation, power flow regulation, power congestion control.…”

Section: Fig 1 Rpgs Configuration With St and Cpt Connected In Parallelmentioning

confidence: 99%

Integration of Large Photovoltaic and Wind System by Means of Smart Transformer

Zhu

Carne

Deng

et al. 2017

IEEE Trans. Ind. Electron.

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Large renewable energy systems (RESs), e.g., photovoltaic (PV) and wind turbine (WT) are connected to grid usually weak, with long lines. This degrades power system stability and reliability. Additionally, the magnetic characteristic of conventional power transformer (CPT) implies a slow dynamic and leads to grid current harmonic too high when wind speed is low and irradiance is weak. This paper proposes a parallel connection of a solid-state transformer-based smart transformer and CPT to not only reduce the power rating but also to support the voltage amplitude and improve the grid current quality. The simulation and experimental results clearly verify the correctness and feasibility of the proposed strategy.

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Section: Fig 1 Rpgs Configuration With St and Cpt Connected In Parallelmentioning

confidence: 99%

Integration of Large Photovoltaic and Wind System by Means of Smart Transformer

Zhu

Carne

Deng

et al. 2017

IEEE Trans. Ind. Electron.

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“…The current controller generates the according inverter output voltage from which the gate signals are calculated by pulse-width modulation (PWM). A more detailed description of MF inverter control is given in [8], [9] for a point-to-point power transfer at an additional frequency in a distribution system. In the following, the instantaneous power of a single-phase inverter in a dualfrequency system is analyzed.…”

Section: Single-phase Inverters In a Dual-frequency Systemmentioning

confidence: 99%

Waveform peak shaping by multi-frequency power transfer in internal, single-phase distribution systems

Bruske

Buticchi

Liserre

2017

2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)

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Abstract-Internal distribution systems such as photovoltaic parks allow to use DC or AC with a frequency different from 50Hz. In this paper is instead proposed to use more than one frequency at the same time. The grid voltage amplitude at the fundamental frequency can be increased while the voltage peak value is kept constant by adding odd harmonics to the voltage waveform. The currents are decreased for the same power level which leads to reduced power converter losses. A further current reduction is achieved if waveform peak shaping is applied to the current waveforms. This paper presents the impact of multi-frequency power transfer on single-phase converters, and verifies the results with analysis and simulations. The impact of harmonic frequencies on cable losses due to the skin effect is taken into consideration in the analysis and effects on protection are discussed.

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“…Unlike the traditional distribution transformer, the "harmonic" frequency signals for power transfer has very limited impact on the ST lifetime, ST losses, and MV grid as well as MV breakers. In [42] and [43], fundamental frequency and third harmonic have been chosen as carrier frequencies in a ST-fed distribution grid to achieve the sophisticated power transfer. The basic control structure is shown in Fig.9, where the voltage control of Fig.7 has been used for LV side DC/AC inverter, while the power control of Fig.3 is used for the grid-interfaced converters of DERs.…”

Section: E Multi-frequency Power Transfermentioning

confidence: 99%

Control and communication in the Smart Transformer-fed grid

Zou

Buticchi

Liserre

2016

2016 IEEE 21st International Conference on Emerging Technologies and Factory Automation (ETFA)

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The Smart Transformer (ST) is a solid-state transformer performing not only a voltage step-down function but also energy and information management. With the help of control and communication technology, the ST can increase hosting capacity of renewable energies and provide ancillary services to utility and customers. To better exploit the potential of a STfed grid, a proper design of architecture, control scenarios and its corresponding communication network has to be done. This paper aims at giving a better understanding of the functionality of the ST-fed grid and of the associated communication challenges.

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Multi-frequency power transfer in a smart transformer based distribution grid

Cited by 26 publications

References 30 publications

Integration of Large Photovoltaic and Wind System by Means of Smart Transformer

Integration of Large Photovoltaic and Wind System by Means of Smart Transformer

Waveform peak shaping by multi-frequency power transfer in internal, single-phase distribution systems

Control and communication in the Smart Transformer-fed grid

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