Parallel connected three phase inverters based on modular design and distributed control

This paper investigates the characteristics of parallel connected three phase inverters based on modular design and distributed control. Every inverter module has a local hardware manager and the whole system has a central application manager. The hardware managers and application manager are connected together by the optical fiber to build a fiber ring net structure. The fiber ring net can achieve high communication rate and synchronous drive signals in different local controllers. Application manager will decide the number of operating modules and every inverter module can run or stop dynamically. The system structure and system model vary with the number of operating modules. The controller in application manager should be designed based on every possible model. In other words, the controller should adapt to the worst situation. In this converter, current sharing performance is good with no current sharing method used. A prototype is made to verify the design and analysis.