What is the rule of the Vdc regulation in a shunt active filter

Published: 13/10/2019
What is the rule of the Vdc regulation in a shunt active filter
Source: ELECTRONICS.STACKEXCHANGE.COM

I understood very well the principals of harmonics identification in an shunt active filter ( PQ theory : Akagi & al for example), but what i don't understand is why do we care about regulating and maintaining the DC link capacitor voltage ? In a paper they quoted : the active power flowing into the active filter needs to be controlled. If the active power flowing into the filter can be con-

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