Abstract
With the development of flywheel technology, the speed and the voltage level of flywheel continue to increase. The Z-type self-balancing modular multilevel converter can have a wide frequency range at medium voltage and is suitable for flywheel driving application. However, the voltage and current characteristics of the flywheel and the variable frequency drive still affect capacitor voltage balance in each phase-leg. The new balance of capacitor voltage can be achieved by controlling the circulating current. This paper proposed a control algorithm of the novel Z-type self-balancing modular multilevel converter for flywheel driving applications. Simulation results are presented to validate the theoretical analysis.
Highlights
IntroductionThe distributed energy system is referring to the combination with various integrated or stand-alone modular power generation devices with a capacity of several kW to 50 MW and energy storage systems
Distributed energy system is an advanced model for future energy development
This paper proposes a control algorithm of the novel Z-type modular multilevel converter for flywheel driving applications
Summary
The distributed energy system is referring to the combination with various integrated or stand-alone modular power generation devices with a capacity of several kW to 50 MW and energy storage systems. There are relatively few studies on the application of the medium voltage modular multilevel converter to the flywheel. Reference [10] proposes a novel Z-type modular multilevel converter(ZTMMC) with capacitor voltage self-balancing capability. Due to simple control algorithm and perfect voltage balancing performance, the ZTMMC is a suitable solution for flywheel energy storage system. This paper proposes a control algorithm of the novel Z-type modular multilevel converter for flywheel driving applications. The circulating current can influence the capacitor voltage in each phase-leg. The capacitor voltage balance in each phase-leg is achieved by controlling the circulating current.
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