The demand for high voltage, high power, high precision and high dynamic 3AC-voltage sources is increasing constantly. One application that gets more and more important in recent years and demands such voltage sources is e.g. Power-Hardware-in-the-Loop (PHIL) Emulation. In this paper a new power converter topology called "Parallel Hybrid Converter" or PHC is presented and a corresponding control scheme is derived. This new converter has a terminal behavior similar to a MMC or MMPMC but compared to them the PHC features significantly reduced costs and a significantly improved power density.
Low-and medium voltage power converters for grid applications require bulky and expensive LCL-filters in order to meet the harmonic limits defined by the grid code. This paper presents a novel hybrid converter topology with smaller passive components, composed of a high power main converter with an integrated low power active filter. The presented coupled control strategies for a current-source and a voltage-source topology enable the immediate mitigation of the switching frequency current ripple, significantly decreasing the total harmonic distortion (THD) of the output current to below 0.5 % and thereby eliminating the need for a passive LCL-filter. Compared to LCL-filter based converter systems, a reduction of the inductive component expenditure of up to 50 % is achievable even for a very low active filter to main converter power rating ratio of 10 %. The outstanding harmonic performance and reduced passive component demand of the hybrid converter allow increased power density and efficiency as well as lower costs of low-and medium voltage power converters.
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