Neural fuzzy stability control system of electric automobile charger and control method

A stability control and neuro-fuzzy technology, applied in electric vehicle charging technology, electric vehicles, charging stations, etc., can solve problems such as charging voltage instability, prolonging battery life, resource waste, etc., to reduce overshoot and Fluctuation, improving power conversion efficiency, and solving the effect of power loss

Active Publication Date: 2019-05-10
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, this type of circuit has high harmonic content, low power factor, and low efficiency and stability of electric energy conversion during charging.
The power conversion efficiency of the charger is not high, so that a considerable part of the electric energy is not fully utilized; the charging voltage

Method used

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  • Neural fuzzy stability control system of electric automobile charger and control method
  • Neural fuzzy stability control system of electric automobile charger and control method
  • Neural fuzzy stability control system of electric automobile charger and control method

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Embodiment Construction

[0026] See the accompanying drawings in the manual Figure 1-Figure 5 , an electric vehicle battery charger output voltage stabilization control technology based on neuro-fuzzy PID control, which is characterized by combining phase-shifting full-bridge ZVS technology and neuro-fuzzy PID control in the design of electric vehicle battery chargers to improve Charger electric energy conversion efficiency, stable charging voltage. The specific implementation steps are:

[0027] Step 1, design the block diagram of the control system, such as figure 1 shown. The specific implementation is completed by steps 2 and 3.

[0028] Step 2, design a fuzzy PID controller based on a phase-shifted full-bridge ZVS DC-DC circuit. The design process of fuzzy PID controller is as follows: figure 2 shown.

[0029] The fuzzy controller collects the output voltage of the circuit in real time and compares it with the ideal output voltage, and inputs the deviation E and the deviation change rate...

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Abstract

The invention relates to a neural fuzzy stability control system of an electric automobile charger and a control method. Compared with a traditional full-bridge type DC-DC conversion circuit, a phase-shifted full-bridge ZVS DC-DC conversion technique adds a resonance inductor and a resonance capacitor element to a circuit, resonance of the resonance inductor and a capacitor is used, four power switch tubes of a full-bridge circuit work in a zero-voltage turn-on and turn-off soft switching state, so that the problem of high-frequency switching power consumption is solved, and electric energy conversion efficiency is improved. A neural fuzzy PID control technique combines neural network control and fuzzy PID control, robustness is good according to fluctuation of circuit parameters, and meanwhile, adaption to the characteristic of object time varying nonlinearity can be achieved. By the adoption of the two techniques, the overshoot and fluctuation of circuit output voltage can be reduced, the circuit response rate is increased, external disturbance is restrained, and circuit stability is improved.

Description

technical field [0001] The invention relates to improving the electric energy conversion efficiency and output voltage stability of an electric vehicle battery charger during charging, in particular to a neuro-fuzzy stability control system and a control method for an electric vehicle charger. Background technique [0002] During the development of electric vehicles, the power supply capacity of electric vehicle battery packs greatly restricts the development of electric vehicles. It can be said that the power supply level of batteries largely determines the performance of electric vehicles. It is very important to seek an efficient, stable, fast and safe charging technology for charging the power supply battery pack to improve the performance of electric vehicles in an all-round way. The commonly used electric vehicle battery charging technology uses controllable rectification technology, such as BUCK-BOOST circuit, half-bridge / full-bridge DC conversion circuit, isolated fo...

Claims

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Application Information

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IPC IPC(8): B60L53/66
CPCY02T90/16Y02T10/7072Y02T10/70Y02T90/12
Inventor 刘雁黄强宁飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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