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This utility model discloses a PTFE membrane fixing structure for irregular roof support cylinders. The PTFE membrane fixing structure is fixed to the steel structure roof or the steel structure support cylinder and is fixedly connected to the PTFE membrane. The PTFE membrane fixing structure includes a first PTFE membrane fixing component for fixing the connection position between the steel structure roof and the steel structure support cylinder, a second PTFE membrane fixing component for fixing adjacent PTFE membranes, and a third PTFE membrane fixing component for fixing the PTFE membrane at the bottom of the steel structure support cylinder. The arrangement of the first, second, and third PTFE membrane fixing components ensures that the PTFE membrane can be fixed at different positions on the steel structure support cylinder, as well as at the connection position between the steel structure roof and the steel structure support cylinder. This ensures that each PTFE membrane can adhere to the steel structure support cylinder or the connection point between the steel structure roof and the steel structure support cylinder, and that each PTFE membrane can exhibit the advantages and effects of the membrane material on curved surfaces, arcs, and curved surfaces.

The present invention discloses a STATCOM system and a control method for a cascaded H-bridge without electrolytic capacitors, belonging to the field of power electronic control. The system comprises: a three-phase power grid, a three-phase reactive load, a filtering inductor and a three-phase cascaded N double-Buck multiplexed H-bridge, N≥2; the double-Buck multiplexed H-bridge comprises: four fully controlled switch tubes S1-S4, two decoupling inductors L r1 and L r2 , three film capacitors C r1 , C r2 and C d ; said C r1 Passing by L r1 Connected to the midpoint of the first bridge arm of the H bridge to form the first bidirectional Buck circuit. This bidirectional Buck circuit and the first bridge arm of the H bridge realize switch tube multiplexing. r2 Passing by L r2 The second bidirectional Buck circuit is connected to the midpoint of the second bridge arm of the H bridge, and the bidirectional Buck circuit and the second bridge arm of the H bridge realize switch tube multiplexing; the system as a whole adopts a star connection. The present invention utilizes multiplexed active power decoupling technology to eliminate the double frequency fluctuation of the H bridge DC side voltage, realizes the replacement of electrolytic capacitors with film capacitors, and improves the power density and reliability of the device.