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Aiming at the problem of five-level modulation strategy, which is numerous and difficult to be unified, a general modulation strategy based on phase-disposition is proposed. The proposed method is unified with the different modulation strategy by adding zero-sequence voltage on the modulated wave or changing the phase of staking carrier. To verify its correctness, using the proposed method to achieve...
A multiterminal Energy Interconnection System Based on MMC was developed, which connected active sub-modules, DC grids and AC grids. However, the power imbalance of the active sub-modules exists in this system, for example, inconsistent maximum power points of the PV panels will lead to system power loss. In order to solve the problem, this paper first presents a power control scheme between the three-terminals,...
Owing to their capability to reduce switching losses, discontinuous pulse-width modulations (DPWMs) have been widely discussed in the last decades. However, when using the classical DPWMs in three-level (3L) converters, neutral-point (NP) voltage balancing may not be efficiently achieved, because the reference signals are clamped and saturated at regular intervals, and consequently it is difficult...
This paper adopts a parallel system where two three-level neutral-point-clamped (NPC) inverters connect both ac and dc sides directly considering compact size, low cost, simplicity and easy expandability. But there is a potential zero-sequence circulating current (ZSCC), when the space-vector modulation method is used in the non-isolated system, then a control strategy for the ZSCC is present. The...
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