An Improved Circulating Current Injection Method for Modular Multilevel Converters in Variable-Speed Drives

Control of Wind Energy Conversion Systems Based on the Modular Multilevel Matrix Converter

“…To implement (23) the positive and negative components of the currents are estimated using the Delay Signal Cancellation (DSC) method proposed in [18]. Finally, using (23) and the control system shown in Fig. 5, the current references * , * , * and * are obtained and regulated using Resonant Controllers.…”

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

“…In a recent paper a control algorithm to partially mitigate the capacitor voltage oscillations [17] was proposed. Although a reduction of the required circulating currents was achieved with the method reported, only simulation results were used to validate the proposed methodology for drive applications.…”

“…Although a reduction of the required circulating currents was achieved with the method reported, only simulation results were used to validate the proposed methodology for drive applications. The experimental results provided in [17] were obtained using a passive RL load, considering operation only in the low speed mode. Moreover the mitigation signals are calculated off-line and lack the necessary adaptation capability to compensate for possible changes in the operating point of the drive [16].…”

Super Capacitor Energy Storage Based MMC for Energy Harvesting in Mine Hoist Application

“…However, AC drive-based MMCs are only suitable for industrial fans, pumps and other applications of small speed range close to the rated value. In order to solve the low-frequency torque ripple issues of conventional MMC motor drive systems, many scholars have component injection and pulse optimization [16][17][18][19]. However, the above method does not fundamentally eliminate the limitations of MMC variable frequency-speed regulation control.…”