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Variable Rounding Level Control Method for Modular Multilevel Converters
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DOI：10.1109/TPEL.2020.3020941.png)
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摘要
En 中文
This article proposes a new control method for modular multilevel converter (MMC), which is based on a modification of the conventional nearest level control (NLC) scheme implemented by a model predictive control (MPC) technique. Applying the proposed method, the simplicity of the NLC is maintained while the current control ability in terms of both phase current and circulating current is enhanced by the MPC technique. A proper rounding function is used for each arm of the MMC instead of the conventional nearest integer function. The rounding function is determined by evaluating a cost function within the frame of MPC. To validate the proposed technique, a three-phase MMC prototype is employed. The conventional NLC-based control approach of MMC is also evaluated for comparative purposes. Results show that the proposed method exhibits excellent current-regulating ability. Compared with the conventional control scheme, the overall performance is improved without significantly increasing the computational burden or adding relevant complexity to the control system design.
Keyword:
Voltage control
Modulation
Capacitors
Switches
Level control
Current control
Indexes
Circulating current
model predictive control (MPC)
modular multilevel converters (MMC)
nearest level control (NLC)
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期刊
IF:
6.5
论文数:
1.7W
被引数:
8.3W
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