This paper presents a decentralized control algorithm for interleaved converters for high reliability application. In previous literature, a master control provides information on the system configuration in order to generate the different carriers. The whole premise of the proposed algorithm is that each module only communicates with its two immediate neighbors which reduce communication latency. Using only the neighbors proper interleaving of the carriers and balancing the converter leg currents is achieved. Carriers from each converter automatically adjust their phase, as modules are added or removed dynamically. Such implementation offers a completely decentralized control which makes it fully modular. Results of the controller are presented using a real-time simulator.

This paper proposes a method to analyse stability of multi-rate system. Multi-rate systems are used to simulate different part of the circuit with different sampling rate. This allows to reduce computational burden of stiff system; by choosing the most appropriate time-step according to the time constant of the phenomena studied. Traditionally, stability of discrete system is done by studying the eigenvalues of the system which can only uses a single sampling time and therefore cannot be applied to multi-rate systems. Many examples, where simulation is done with multiple rate, can be found in literature with no proof of stability other than simulation results. In this paper, multi-rate system are first represented as non-linear system using a single time-step and their stability is then demonstrated using Lyapunov's theorem. The proposed method is supported by a numerical example.