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Modular multilevel converter (MMC) has attracted great attention in the high voltage direct current (HVDC) transmission systems. Redundant submodules (SMs) are usually set to enhance the reliability of MMC. However, if some SMs break down, the arm energy is unbalanced and fundamental fluctuation appears in the DC current. This paper proposes an arm energy rebalancing control scheme to suppress the...
The great number of power modules (PMs) imposes great computational challenge on the voltage balancing of modular multilevel converter (MMC) as the sorting of the PM capacitor voltages is usually adopted. This paper presents a distributed control method for PM capacitor voltage balancing in MMC. With this method, all PMs in one arm are grouped and the sorting algorithm of the voltage balancing in...
The high-capacity modular multilevel converter (MMC) is becoming the most popular type of voltage-source converters for high voltage direct current (HVDC) transmission. However, the nonlinearity of the loss characteristics of the switching devices and the complexity of the switching patterns impose great challenge on the loss modeling of MMC. The present methods still have some flaws in modulation...
Modular multilevel converter (MMC) is a promising circuit topology in the field of high-voltage direct current transmission (HVDC) systems. To enhance the reliability of the MMC in this field, the popular method is the addition of redundant submodules (SMs). However, the MMC will become unbalanced when some SMs fails and the performance will be deteriorated, especially when the number of the failed...
For the modular multilevel converter (MMC) connected with the grid is the most important application. In this paper, an equivalent model of the MMC in the dq synchronous reference is deduced. Different from traditional converter, this model indicates both the inductance and the equivalent capacitance in the ac side would influence the system control. In order to simplify the control to the input currents,...
Smart energy router (SER), also called as power electronics transformer (PET) or solid state transformer (SST), will serve as a critical component in the next-generation electric power system. Taking advantage of modular multilevel converter (MMC) and input series output parallel (ISOP) topologies, new type of smart energy router has been developed. Presented architecture using two stages with AC/DC...
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