Abstract: A virtual co-phase power supply system topology suitable for an electrical sectioning device at a sectioning and paralleling post (SP) includes a step-down transformer TR1. A primary winding of the step-down transformer TR1 is electrically connected to a traction feeding section ?2 in a train from a traction feeding section ?1 to the traction feeding section ?2. Each secondary winding is electrically connected to one rectifier separately. DC buses output from the rectifiers are connected in parallel. The other end of the DC bus is electrically connected to a plurality of parallel inverter units. An LC filter is provided on a DC bus between a rectifier unit and the inverter unit, and the LC filter is connected in parallel to an energy storage unit. After filtering through the LC filter, an output end of the inverter unit is electrically connected to a primary winding of a step-up transformer TR2.

Abstract: A modified modulated wave acquisition method includes: obtaining a modulated wave uaba; calculating a difference between the given value iNq* and the actual value iNq of the q-axis component of a grid side current, inputting the result to a proportional integral (PI) controller, and multiplying an output of the PI controller by cos ?t to obtain a modulated wave offset ?uaba; and calculating a difference between the modulated wave uaba and the modulated wave offset ?uaba to obtain a modified modulation wave uaba?, where ?t is a grid voltage phase in a sinusoidal case. The MPC method for a single-phase cascaded H-bridge rectifier includes: obtaining the modified modulated wave uaba?, where the component iNq* is 0; and replacing the modulated wave uaba with the modified modulated wave uaba? to perform MPC for the single-phase cascaded H-bridge rectifier.

Abstract: A virtual co-phase power supply system topology suitable for an electrical sectioning device at a sectioning and paralleling post (SP) includes a step-down transformer TR1. A primary winding of the step-down transformer TR1 is electrically connected to a traction feeding section ?2 in a train from a traction feeding section ?1 to the traction feeding section ?2. Each secondary winding is electrically connected to one rectifier separately. DC buses output from the rectifiers are connected in parallel. The other end of the DC bus is electrically connected to a plurality of parallel inverter units. An LC filter is provided on a DC bus between a rectifier unit and the inverter unit, and the LC filter is connected in parallel to an energy storage unit. After filtering through the LC filter, an output end of the inverter unit is electrically connected to a primary winding of a step-up transformer TR2.

Abstract: A modified modulated wave acquisition method includes: obtaining a modulated wave uaba; calculating a difference between the given value iNq* and the actual value iNq of the q-axis component of a grid side current, inputting the result to a proportional integral (PI) controller, and multiplying an output of the PI controller by cos ?t to obtain a modulated wave offset ?uaba; and calculating a difference between the modulated wave uaba and the modulated wave offset ?uaba to obtain a modified modulation wave uaba?, where ?t is a grid voltage phase in a sinusoidal case. The MPC method for a single-phase cascaded H-bridge rectifier includes: obtaining the modified modulated wave uaba?, where the component iNq* is 0; and replacing the modulated wave uaba with the modified modulated wave uaba? to perform MPC for the single-phase cascaded H-bridge rectifier.