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Convergence process of the active power filter using adaptive inverse modeling

According to the law of conversion of energy, the charge of the average dc capacitor voltage of the active power filter can supply the real power flow information. If the average dc capacitor voltage is controlled to be a constant referenced value, it is necessary to drive the required filter compensating current into the supply, hence removing the effects of the load harmonics. The parts of the main circuits including the supply, the loads and the active power filter are defined as a generalized active power filter. A novel algorithm of the plant model and the inverse model are adaptive. It is necessary to know the precision model of the generalized active power filter. The only important point is that the plant model has the same dynamic response with the generalized active power filter. The modeling principle of the proposed active power filter is analyzed. The dynamic diagram of the model is achieved by means of simulation. The minimum and maximum amplitude of the expected mains current is established. The convergence process of the system is analyzed. The experiment results validate the principle analysis.