Regenerative energy recovery system based on flywheel energy storage and inverter feedback and control method

Abstract

The invention relates to the technical field of urban rail transit regenerative energy recovery, in particular to a regenerative energy recovery system based on flywheel energy storage and inverter feedback, the system comprises at least one inverter feedback module, at least one flywheel energy storage feedback module, a detection module and a voltage sensor. The inverter feedback module and theflywheel energy storage feedback module in the system work in coordination with each other, and the regenerative energy is mainly fed back by the inverter, the regenerative energy is fully utilized, and the problem of the electric energy reverse transmission is solved; In addition, the flywheel energy storage feedback module does not need to be configured according to the maximum absorbed power demand, and the overall economy and energy saving effect of the system are better than the single inverter feedback and flywheel energy storage feedback. The control method of the system provided by theinvention decouples the inverter feedback module and the flywheel energy storage feedback module in control, does not need to rely on mutual communication, reduces the complexity of system control, has expansibility, and is convenient for construction and operation and maintenance.

Description

technical field [0001] The invention relates to the technical field of urban rail transit regenerative energy recovery, in particular to a regenerative energy recovery system and control method based on flywheel energy storage and inverter feedback. Background technique [0002] Electricity accounts for about 30-40% of the operating costs of rail transit such as subways. At present, rail trains generally adopt variable voltage and variable frequency (VVVF) transmission mode. When the train brakes, the electric energy can be fed back to the traction grid for use by other trains. This part of the regenerative braking energy is very considerable. In some traction grids, regenerative braking The energy accounts for about 30% of the total electric energy of train traction, and has great energy-saving space. [0003] Commonly used regenerative braking energy absorption methods mainly include the following technologies: resistive energy consumption type, supercapacitor energy stor...

AI Technical Summary

Problems solved by technology

This type of device partially utilizes the regenerative braking energy of the train, which has a certain energy-saving effect, but is limited by the load capacity of the low-voltage side or the load capacity of the medium-voltage side, the regenerative electric energy cannot be fully utilized, and it is possible to send power backward to the grid, affecting Relay Protection and Power Quality of Power Supply System

[0008] In order to solve the problem of recovery and utilization of regenerative braking energy in rail transit, it is difficult to achieve the best technical performance and economic indicators at the same time only by a single product

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