A function-based approach for modelling multi-module PWM DC–DC distributed converter systems

Author： Mansoor Khan Muhammad Zhi-Ming Wu

ISSN： 1362-3060

Source： International Journal of Electronics, Vol.89, Iss.2, 2002-02, pp. : 171-190

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Abstract

Large signal modelling of distributed converter systems is complicated by the fact that the number of switch combinations involved in circuit operation forces it to assume many different topologies. This paper proposes a simple sampled-data technique for modelling distributed DC–DC PWM converter systems (DCS). The model obtained is nonlinear and can be linearized for analysis and design of DCS. The notion of time-lifted system introduced in the sampled-data control system has been adopted to represent the system in a more compact and appropriate form, and each converter module is represented as a continuous-time lifted system. As the input and output of DC–DC converters vary slowly, a suitable model for the distributed power system model can be obtained in terms of the finite-order input/output approximation. A parallel converter system composed of two buck converters has been taken example to demonstrate the validity of the proposed model.