CPC H02M 7/53871 (2013.01) [H02M 1/0009 (2021.05); H02M 1/14 (2013.01); H02M 7/53873 (2013.01)] | 18 Claims |
1. A control method of a DC-AC inverter system, comprising:
receiving, by a state observer, a DC link voltage at a current sampling time and a filter-capacitor-voltage actual value at the current sampling time;
outputting, by the state observer, a filter-capacitor-current estimation value at a next sampling time according to the DC link voltage at the current sampling time and the filter-capacitor-voltage actual value at the current sampling time, wherein the filter-capacitor-current estimation value at the next sampling time is an average current value without ripple;
receiving, by an inductor current calculator, a filter-inductor-current actual value at the current sampling time;
outputting, by the inductor current calculator, a filter-inductor-current estimation value at the next sampling time according to the DC link voltage at the current sampling time and the filter-inductor-current actual value at the current sampling time;
comparing the filter-inductor-current estimation value at the next sampling time with the filter-capacitor-current estimation value at the next sampling time to obtain a load current estimation value at the next sampling time;
outputting, by an inductor voltage estimator, a filter-inductor-voltage estimation value at the next sampling time according to the load current estimation value at the next sampling time; and
performing a feed-forward control according to the filter-inductor-voltage estimation value at the next sampling time.
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