Single-phase energy storage inverter modeling

What is a single phase inverter?

The main idea is that one phase leg is multiplexed so that the inverter can realise not only dc-to-ac conversion but also low-frequency input current ripple reduction. No extra power switches are required, so the inverter can possess the simpler configuration and higher efficiency.

What is a single-stage inverter?

Besides, the equivalence of control strategy and the similarity of circuit component rating are revealed between this single-stage inverter and a conventional two-stage inverter. The single-stage inverter is preferred in the applications which are sensitive to the power switch number and low-frequency input current ripple.

Why is a single-stage inverter model independent of operation mode?

Besides, the ac output port of single-stage inverter is viewed as connecting to an ac current source io when making the modelling and equivalence analysis. The inverter operation mode is not involved in this process at all. Thus this modelling idea is independent of operation mode.

Can a single-stage single-phase inverter achieve DC-AC power conversion?

A current-fed-type single-stage single-phase inverter is investigated. Based on the switch multiplexing technique, it can realise not only dc–ac power conversion but also low-frequency input current ripple reduction with a lower number of power switches.

Does single-stage inverter reduce power switch loss?

However, the switch current stresses of the dc–ac stage of two topologies are almost same, and the single-stage inverter has only half number of switches. Thus the power switch loss of dc–ac leg in single-stage inverter can be greatly reduced; (ii) in the single-stage inverter, the switch loss of dc–ac leg is larger than the one of dc–dc leg.

Does a single-stage inverter have a higher DC bus voltage?

The single-stage inverter has a higher dc bus voltage which may leads to a larger IGBT switching loss. However, the switch current stresses of the dc–ac stage of two topologies are almost same, and the single-stage inverter has only half number of switches.