Abstract
Conventional Magnetic Transformers are key components in a distribution system as it performs several functions like voltage transformation and isolation. However due to increase in penetration of renewable energies into distribution system, existing conventional transformers are expected to be replaced by a solid-state transformer (SST) which offers several advantages as reported in literature. SST can also be used to connect AC or DC grids because it can be operated at a much higher frequency and voltage which results in reduction in the size of conventional transformers as size of transformer is inversely proportional to frequency. In this paper, design and analysis of a 3-phase PWM Inverter using half - bridge topology for 11kV/381V, 100kVA solid-state transformer (SST) is presented for power distribution system application. The mathematical model of SST is developed using analytical calculations and then implemented in MATLAB simulation program. Finally it is implemented in hardware in a laboratory for a half-bridge topology. The main system has been virtually created in order to actualize the conversion from DC to AC.
Highlights
Exiting distribution system is changing its dynamics due to advancement of power electronics and integration of renewable energies into existing conventional grid [1]
Solid State Transformer, which is a power electronics-based transformer (PET), is taken as one of the advanced technologies for Future Renewable Electric Energy Distribution and Management (FREEDM) Systems Center coupled with main research topics in power electronics field [2]
Mathematical analysis of Fig-7 reveals that using Full Bridge (FB) topology at pulse width modulation (PWM) inverter and full bridge (FB) at low frequency(LF) inverter, in analysis for research, the output voltage of PWM inverter comes to 10.253kV with 6x bridges configuration utilizing 24 transistors as switching devices
Summary
Exiting distribution system is changing its dynamics due to advancement of power electronics and integration of renewable energies into existing conventional grid [1]. Three stage SST block diagram is illustrated in Fig-1 In this illustration, a DC-DC converter stage in a medium frequency transformer isolated scenario, facilitates for provision of the galvanic isolation with a dc bus, but it plays a promising role in ascertaining the overall system efficiency and effectiveness with the power density. From operation point of view, as per calculation subsequently, the rectifier interfaced with the 11-kV-electric utility grid is utilized to facilitate the function of power factor correction whilst converting 11kV ac into 15kVdc. The DC–DC converter being a focal and main stage of SST, establishes galvanic isolation with high frequency while converting 15kVdc at its input to 450-V dc at output. In this paper a design and analysis of a 3-phase PWM Inverter using half–bridge topology for 11kV/381V, 100kVA solid-state transformer (SST) is presented for power distribution system application. Fig-4 illustrates an overview of centralized power network highlighting its transmission and distribution/circulation in our scenario [35]
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