High Dynamics Control for MMC Based on Exact Discrete-Time Model with Experimental Validation - 2017


Because of the complexity of the system, the management of the modular multilevel converter (MMC) constitutes an intense research activity. The stored energy inside the MMC presents a new degree of freedom, which can be exploited to produce ancillary services (oscillation damping for example). So as to do therefore, the response time of the energy loop must be as fast as possible. However, when a cascaded approach is employed to regulate the structure, this purpose can't be achieved without fast inner loops. This paper presents a novel inner loops controller so as to obtain a high response dynamic. These controllers are developed primarily based on actual discrete-time models obtained from an analytic calculation of exponential of matrices. A pole placement methodology using feedback management has been chosen to derive their management laws. For stability matters, a pole location analysis is used to set appropriately the controller parameters, that are the sampling amount and the controller gains. After validation with offline simulations and so as to point out the advantages of the proposed controllers compared to the present solutions, experimental tests are performed using a real small-scale MMC.

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