Two-stage bidirectional converter fractional order control method based on V2G

Abstract

The invention discloses a two-stage bidirectional converter fractional order control method based on V2G, and the method comprises the steps: carrying out the small signal modeling of a two-stage integrated topological structure, so as to obtain a small signal model of the two-stage integrated topological structure; performing fractional order control on the small signal model so as to control two stages of the two-stage integrated topological structure at the same time; and performing joint optimization on control parameters of the fractional order controller by using a particle swarm algorithm, and optimizing two-stage parameters at the same time. Fractional order control is adopted, fractional order PI retains the characteristics of simple structure and high robustness of an integer PI controller, an adjustable parameter is added, and the control performance of the system is further improved. Control parameter joint optimization is adopted, system deviations of the front stage and the rear stage of the converter and index requirements of the front stage, the rear stage and an interbus are considered, and consistency and stability of the system are guaranteed.

Description

technical field [0001] The present invention relates to the technical field of V2G, in particular to an integrated topology structure of a two-stage bidirectional converter, a V2G-based two-stage bidirectional converter and a fractional-order control method for a V2G-based two-stage bidirectional converter. Background technique [0002] In real life, the efficiency of the grid is not high. Because electric energy has the characteristics that it cannot be stored in large quantities, a large part of the capacity will be vacant during power generation. Daily fluctuations in load demand and the need for voltage and frequency regulation on the grid also contribute to the above problems. Urban and rural electricity consumption has time fluctuations such as peak periods and trough periods, as well as spatial unreasonableness such as unbalanced electricity demand and uneven electricity load. [0003] During peak electricity usage hours, the grid is often overloaded, with demand ex...

AI Technical Summary

Problems solved by technology

[0009] (1) Single full-bridge topology is adopted, and the turn-on and turn-off of the switch tube are controlled by hard switches, which affects the efficiency of the power processing unit in high-power applications and increases the difficulty of heat dissipation

[0010] (2) Although the resonant DC / DC bidirectional AC / DC converter can realize zero-voltage (ZVS) soft switching in the full load range, the introduction of components such as inductors and capacitors will increase the quality of the power supply, and the control implementation is more complicated

[0011] (3) The two-stage design of the bidirectional AC / DC converter occupies a large space, which affects the vehicle application of the converter, and also increases the production cost

[0012] (4) Control methods such as neural network PID / PI, hysteresis voltage control, and single closed-loop PID / PI control are adopted. These methods have their own characteristics, but it is difficult to have good steady-state output, fast dynamic response, and good robustness.

Images