A power converter is provided which does not need both harmonic suppressive filter and buffer reactor. A power converter that injects or absorbs reactive power relative to a three-phase AC system includes a delta connection block 3 that includes power-source circuits 4 in respective phases in delta connection, and each power-source circuit includes plural H-bridge unitary converter blocks 5 connected in series. A winding of an isolation transformer 2 that isolates the three-phase AC system from the delta connection block 3 is inserted on a circuit of the delta connection block 3.
