Voltage balance method between bridge arms of modular multilevel converter based on peak prediction
A modular multi-level, converter technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the uncontrollable dynamic process of overcurrent or overvoltage, bridge arm voltage rebalancing, and balance controller response Slowdown etc.
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[0042] A method for balancing the voltage between bridge arms of a modular multilevel converter based on peak value prediction proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments:
[0043] The present invention proposes a method for balancing voltage between bridge arms of a modular multilevel converter based on peak value prediction, which performs steps 1) to 5) in a loop:
[0044] 1) Collect and obtain the data required for control, including:
[0045] 1-1) Collect the instantaneous value v of the three-phase voltage at the AC port of the converter a , v b , v c , DC port voltage v dc , arm voltage v aucap , v alcap 、vb ucap , v blcap , v cucap , v clcap ;
[0046] 1-2) Obtain the current d-axis position wt from the phase-locked loop;
[0047] 1-3) Obtain d-axis current and q-axis current reference value i from the AC port controller d_r i q_r ;
[0048] 1-4) Obtain the equivalent ca...
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