Development of a High Frequency/Power Three-Port SST Suitable for Solar PV/Battery Interface

ÖZDEMİR Ş., ALTIN N., El Shafei A., Nasiri A.

38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023, Florida, United States Of America, 19 - 23 March 2023, vol.2023-March, pp.2313-2320 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 2023-March
  • Doi Number: 10.1109/apec43580.2023.10131450
  • City: Florida
  • Country: United States Of America
  • Page Numbers: pp.2313-2320
  • Keywords: High frequency, high power, multi-port, solid state transformer, three-port
  • Gazi University Affiliated: Yes

Abstract

In this paper, a three-port Solid State Transformer (SST) is proposed to integrate solar PV and battery in a grid-tie arrangement. Unlike other SSTs, the proposed system has three active ports that are connected via H-bridge inverters allowing bidirectional power flow. Each port is galvanically isolated and power sharing action is achieved by a single high frequency transformer. Different power flow profiles can easily be achieved. The system offers reduced size, weight and cost. However, the transformer design and power control is more complicated in terms of parasitic capacitance, leakage inductance, winding placement and three-way power control. The transformer design steps, control structure, design process, simulation and experimental results are provided for a 100 kW SST system.