An asynchronous compensation voltage equalization device and control method for a vehicle-mounted supercapacitor

Abstract

The invention discloses an asynchronous compensation pressure equalization device for a vehicle-mounted super capacitor, and a control method. The device comprises a DC (Direct Current) / AC (Alternating Current) unit, a synchronous rectification unit, a super capacitance block unit, a voltage and current collection unit and a control unit. The control method comprises the following steps that: thecontrol unit establishes the state space model of each super capacitor unit and a corresponding slip form observer model, and on the basis of data measured offline and data collected by the voltage and current collection unit in real, the slip form observer is adopted to estimate the internal voltage value of each super capacitor unit; the control unit judges whether voltage balance needs to be carried out or not according to the internal voltage value of each super capacitor unit and a voltage threshold value, a corresponding controlled quantity is output to the synchronous rectification unit, the state of a driving switch in the synchronous rectification unit is controlled to control the corresponding super capacitor units to charge and discharge so as to realize voltage balance. The device has the advantages of good voltage balance effect and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of pantograph-catenary rail transit energy storage, and relates to an asynchronous compensation voltage equalization device and a control method for a vehicle-mounted supercapacitor. Background technique [0002] Supercapacitor is a new green energy storage element, which has the incomparable advantages of traditional energy storage elements such as high energy density, large discharge current and long service life. It is widely used in many fields such as grid energy storage, new energy vehicles and rail transit. . Energy storage urban rail uses supercapacitors as its sole power source, which can not only avoid the safety and cost problems caused by erecting traction grids, but also improve the efficiency of energy recycling during braking. The voltage of the supercapacitor unit is low. In order to meet the demand for energy storage capacity, a large number of monomers must be used in series and parallel c...

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Problems solved by technology

[0004] The invention aims to solve the problem that the voltage imbalance of the supercapacitor energy storage system in urban rail transit seriously affects the energy storage efficiency and service life of the supercapacitor, and proposes an asynchronous compensation voltage equalization device and control method for a vehicle-mounted supercapacitor, which has a good equalization effect ,efficient

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