A new hybrid active power filter topology with continuous compensation bandwidth and small active capacity

Shunt hybrid active power filter (HAPF) which consists of both active and passive parts has a lot of attractive points, e.g. suitable for high power and/or high voltage application, cost-effective initial investment and convenient for connection etc. However, popular HAPF configurations are confronted larger active part´s capacity, discontinuous impedance in frequency domain and sensitive to passive filter mistuned, which results in higher cost and unsatisfied harmonic compensation performance respectively. A modified HAPF [3] has, on the other hand, the problem that hard to regulate the DC bus voltage due to its very high fundamental impedance. This paper proposes a new topology with further improvement of passive part and has the advantages of low active capacity, low cost, continuous frequency-domain impedance, satisfied harmonic suppression performance and can regulate DC bus voltage to constant. Detail analysis and simulations verify the effectiveness and feasibility.