A novel multiport, multivoltage level photovoltaic-energy storage DC distribution network topology

With the gradual maturity and popularization of DC distribution network technology, there is an increasing demand for DC distribution networks with multi-voltage level configurations in various power system applications. Traditional DC converter technology is limited to providing only one output voltage level, making it challenging to satisfy the intricate needs of DC distribution networks that require multiple voltage levels. In this paper, a new multi-port photovoltaic-energy storage DC distribution network topology for multi-voltage levels is proposed, i.e., using multi-winding transformers and two AC power input ports to construct AC power buses with multiple voltage levels, and forming DC buses with different voltage levels of 0V, 750V, 1500V, and 2250V on the DC side through AC/DC converter units. Simultaneously, the suggested structure incorporates energy storage batteries and solar panels, which are connected to the DC bus using DC/DC converter technology. This setup offers dynamic energy support and the ability to regulate the distribution network.