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Voltage Estimation for Diode-Clamped MMC Using Compensated State-Space Model

Modular multilevel converters are wellknown in the energy sector and have significant potential in others, such as electromobility. Generally, their stable operation is at the expense of numerous sensors, communication burdens, and complicated balancing strategies that challenge their expansion to cost driven applications. Hence, the introduction of a sensorless voltage balancing strategy with a simple controller is an attractive objective. Diode clamped MMCs offer a simple yet effective solution by providing a unidirectional balancing path between two modules through a diode, and ideally, the modulation technique should compensate for the lack of bidirectional energy transfer. Hence open loop operation is possible. Although the open loop operation is desirable to reduce costs, good knowledge of the modules voltages for system monitoring and protection functions still appears mandatory. This paper develops a compensated state space model for diode clamped MMCs and integrates it with an optimal estimator to reliably estimate the voltage of all modules without any direct measurement at module terminals. Additionally, the model considers the effect of the diode clamped branches and their balancing effect, resulting in a 30 percent to 50 percent reduction in estimation error compared to the conventional model.

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