Steady-State Simulation Methods of Closed-Loop Power Converter Systems—A Systematic Solution Procedure

While a host of analysis techniques exist to perform steady-state analysis of open-loop converter systems, solutions for close-loop converter systems are distinctly more challenging to obtain. Analysis is done either via computationally intensive time-domain simulation or through reliance on a disconnected collection of published iteration techniques. Moreover, most of these iteration techniques deal with a system containing only one or two converters. This is not adequate to deal with a smart grid or microgrid system, which consists of multiple (more than two) converters. This paper proposes a generalized and systematic solution procedure to obtain the steady state of a system containing multiple closed-loop power converters, in a computationally efficient manner. The solution procedure consists of a general five step approach that can easily be applied to a wide variety of power converter systems. It is shown that numerous previously proposed methods may be viewed as specific implementations of the generalized systematic procedure. A new solution approach, suitable for analysis of tightly coupled multiconverter networks, is developed based on the generalized solution procedure. Results of the new approach are validated against PSCAD/EMTDC simulations for a representative multiconverter network.