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This paper proposes chain circuit active power filter for high voltage high power applications. The system configuration and its control methods are given in detail in this paper. Finally, a prototype APF, rated at 10KV/1MVA based on cascaded 23 rd -level cascaded inverter is described and the proposed method is implemented with a digital signal processors control system. The simulation and experimental waveforms show that good filtering characteristics and fast responses of the APF are achieved and the each capacitor voltage is also controlled and balanced by using the proposed control circuits, which can also be used in high voltage high power applications of more than 23 rd -level cascaded inverter for active power filters.