Pipeline type pump turbine capable of improving micro-grid power supply electric energy quality

The invention discloses a pipeline type pump turbine capable of improving the power supply electric energy quality of a micro-grid, belongs to the field of hydroelectric generation, and aims to solve the problem of frequency fluctuation in the micro-grid caused by the fact that water flows to an impeller of the pump turbine through a turn. Comprising a high-pressure section, a rotating part assembly, an impeller cavity section and a low-pressure section, the high-pressure section comprises an outer pressure-bearing piece and an inner pressure-bearing piece which are coaxially connected in a sleeved mode, and an annular flow channel is formed between the inner pressure-bearing piece and the outer pressure-bearing piece. The high-pressure section, the impeller cavity section and the low-pressure section are sequentially connected rightwards, the high-pressure section comprises an outer pressure-bearing part and an inner pressure-bearing part which are coaxially connected in a sleeved mode, the outer pressure-be