A Phase Capacitance Voltage Control Method Applied to Modular Multilevel Converter
A modular multi-level, capacitive voltage technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of increasing system burden, restricting design, and not considering sub-module capacitive voltage fluctuations and other issues, to achieve the effects of suppressing adverse effects, improving stability, and reducing computational burden
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[0038] The present invention is described in further detail below in conjunction with accompanying drawing:
[0039] refer to figure 1 and figure 2 , the phase capacitance voltage control method applied to the modular multilevel converter of the present invention comprises the following steps:
[0040] 1) Obtain the sub-module capacitor voltage and u in the converter phase ∑ , and then the sub-module capacitor voltage in the converter phase and u ∑ With voltage command value 2U dc For comparison, where U dc is the DC bus voltage, and the DC error signal u is obtained error ;
[0041] 2) The DC error signal u error Perform low-pass filtering through a low-pass filter to remove the harmonic components and noise, and obtain the filtered DC error signal u error,LPF ;
[0042] 3) The filtered DC error signal u error,LPF Send it to the proportional-integral controller, and send the output signal of the proportional-integral controller to the pole compensator, and then use...
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