Flexible power distribution unit — A novel power electronic transformer development and demonstration for distribution system

Exploiting end-users capability in voltage support by means of power electronic transformer

“…With the development of power electronics, the PETs are new emerging devices used for voltage conversion and energy delivery that regarding their abilities, gain more and more attention. The PETs are a combination of power electronic technology and conventional transformer core used to convert the energy in the distribution system and extend the functions of the conventional power transformer . These emerging devices, in addition to conventional functions of voltage transformation and the electric isolation, at the same time, present many additional features.…”

“…The transformer core size is a function of saturation flux density of the core material and maximum permissible core and winding temperature rise. In addition, the saturation flux density is inversely proportional to working frequency; hence, the working frequency increments will result in core size reduction, leading to reduction in the PET size . The overall efficiency of the PET including the converter loss, ƞ, is defined by Equation :…”

“…The PETs are a combination of power electronic technology and conventional transformer core used to convert the energy in the distribution system and extend the functions of the conventional power transformer. 3 These emerging devices, in addition to conventional functions of voltage transformation and the electric isolation, at the same time, present many additional features. The input current and power factor are controllable, and the high-frequency transformer makes the whole system smaller and lighter.…”

“…The power electronic transformer (PET) incorporates the benefits of power electronic into power transformer. The PET adds many new functions such as harmonic isolation, power factor correction, nodal voltage, and frequency control to traditional power transformer . The utilization of the PET in an active distribution network investigated in Zhou et al It is shown that the PETs have superiority regarding conventional transformers as promising electrical equipment in future power systems.…”

Research on Simplified Model of AC/DC Hybrid Microgrid for Fault Analysis

“…In [7], the typical control strategy for parallel operation was studied to realize the rational distribution of active and reactive power between power electronics transformers operating in parallel. In [8], a new type of power distribution transformer for the power distribution system was proposed, called the flexible power distribution unit, which revealed the energy exchange mechanism between the power grid and the load.…”