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Modular multilevel converters (MMCs) become popular in high-voltage dc transmission systems; however, their applications in medium-voltage (MV) motor drives are still limited due to the technical challenge of low-frequency voltage fluctuation. This paper proposes a new solution to address this problem. Full-bridge submodules (SMs) are used in the place of half-bridge SMs in the MMC to significantly...
In the microgrid, the capacitive element such as compensation capacitor may resonance with the line inductance in harmonic frequency, furthermore serious harmonic resonance may endanger the system. In this paper, resonance mode analysis (RMA) method is used to analysis the harmonic resonance in the microgrid. To suppress the amplified of harmonic current near resonance frequency, an improved current...
A control method named Active Harmonic Resistance (AHR) using repetitive control technique is proposed to suppress the resonance between the power capacitor and system inductance in power distribution network. Firstly, this paper explains the theory of AHR and its low voltage tracking precision. Secondly, the parameters design and stability analysis of repetitive controller applied in the voltage...
Modular multilevel converters (MMC) are intensively researched and developed in high power, high/medium voltage applications. However, the interaction between switching action and fundamental-frequency pulsation in capacitor voltage of submodules will induce 2nd-order and other even-harmonic harmonics in circulating current. These harmonic currents will introduce extra power loss, increase current...
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