A power conversion apparatus, comprising: an enclosure defining an enclosure interior and having a bottom; a plurality of AC electrical connections for connecting external AC power lines to the power conversion apparatus; a first and second DC electrical connections for connecting external DC power lines to the power conversion apparatus; a switching circuit located in the enclosure interior and including: first and second DC nodes individually electrically connected to a corresponding one of the first and second DC electrical connections, a plurality of AC nodes individually electrically coupled with a corresponding one of the AC electrical connections, and a plurality of switching devices (S1-S6) individually operative to selectively couple a corresponding one of the plurality of AC nodes with a corresponding one of the first and second DC nodes according to a corresponding switching control signal; and a filter circuit including: a plurality of inductors individually electrically connected between a corresponding one of the plurality of AC nodes of the switching circuit and a corresponding one of the plurality of AC electrical connections, and a plurality of filter resistors, wherein the plurality of filter resistors are individually connected in parallel with a corresponding one of the plurality of inductors; wherein the enclosure includes a top vertically spaced from and above the bottom of the enclosure, wherein the enclosure defines a single airflow path between the top and the bottom, and wherein the plurality of inductors of the filter circuit are positioned vertically between the switching circuit and the bottom of the enclosure, and characterized in that the switching circuit is positioned vertically between the plurality of inductors of the filter circuit and the plurality of filter resistors, and the plurality of filter resistors are positioned vertically between the switching circuit and the top of the enclosure. an enclosure defining an enclosure interior and having a bottom; a plurality of AC electrical connections for connecting external AC power lines to the power conversion apparatus; a first and second DC electrical connections for connecting external DC power lines to the power conversion apparatus; a switching circuit located in the enclosure interior and including: first and second DC nodes individually electrically connected to a corresponding one of the first and second DC electrical connections, a plurality of AC nodes individually electrically coupled with a corresponding one of the AC electrical connections, and a plurality of switching devices (S1-S6) individually operative to selectively couple a corresponding one of the plurality of AC nodes with a corresponding one of the first and second DC nodes according to a corresponding switching control signal; and first and second DC nodes individually electrically connected to a corresponding one of the first and second DC electrical connections, a plurality of AC nodes individually electrically coupled with a corresponding one of the AC electrical connections, and a plurality of switching devices (S1-S6) individually operative to selectively couple a corresponding one of the plurality of AC nodes with a corresponding one of the first and second DC nodes according to a corresponding switching control signal; and a filter circuit including: a plurality of inductors individually electrically connected between a corresponding one of the plurality of AC nodes of the switching circuit and a corresponding one of the plurality of AC electrical connections, and a plurality of filter resistors, a plurality of inductors individually electrically connected between a corresponding one of the plurality of AC nodes of the switching circuit and a corresponding one of the plurality of AC electrical connections, and a plurality of filter resistors, wherein the enclosure includes a top vertically spaced from and above the bottom of the enclosure, wherein the enclosure defines a single airflow path between the top and the bottom, and wherein the plurality of inductors of the filter circuit are positioned vertically between the switching circuit and the bottom of the enclosure, and characterized in that the switching circuit is positioned vertically between the plurality of inductors of the filter circuit and the plurality of filter resistors, and the plurality of filter resistors are positioned vertically between the switching circuit and the top of the enclosure.