Architectures Synthesizing Method for Medium-Voltage Photovoltaic Power Electronic Systems

Numerous architectures for medium-voltage power electronic systems are investigated. To find out the architectures suitable for the medium-voltage photovoltaic power electronic systems, this paper gives a systematic study on medium-voltage power electronic systems (MVPESs) architectures for large-scale PV plants. A synthesis method of MVPESs is firstly introduced. It is composed of two steps. First, the power conversion chains are synthesized by traversing all possible designs of the multi-stage converters. Based on the power conversion chains, topologies are obtained by cascade connection or parallel connection. A data structure representing the MVPESs is also introduced that can help to synthesize the MVPESs using computer. The advantages and disadvantages of these MVPESs are also discussed. Two typical MVPES architectures are compared with efficiency and cost.