Electric vehicle charger harmonic suppression method
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A harmonic suppression and electric vehicle technology, applied in electric vehicles, harmonic reduction devices, battery circuit devices, etc., can solve the problems of unrealized control and harmonic suppression, and achieve no static error tracking, reduce THD, suppress The effect of the effect of the periodic perturbation
Pending Publication Date: 2022-04-08
HENAN IND & TRADE VOCATIONAL COLLEGE
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This invention is aimed at the control and ripple suppression of the output voltage and current of the charger. For the input current of the charger, the grid-side current at the connection with the grid has not been controlled and the harmonic suppression is processed.
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Embodiment 1
[0031] see Figure 1-Figure 5 , the method for suppressing the harmonics of the electric vehicle charger of the present invention uses a repetitive control scheme to realize the harmonic suppression of the electric vehicle charger, comprising the following steps:
[0032] 1) Construct the topological structure of the charger with the single-phase PWM rectification method of the pre-LCL filter, such as figure 1 As shown, compared with the phase-controlled rectifier, the charger based on the PWM rectification structure has the advantages of good harmonic suppression effect and high power factor;
[0033] 2) Establish a mathematical model of a single-phase PWM rectifier charger;
[0034] 3) Analyze the harmonic characteristics in the electric vehicle charger model;
[0035] For the three-phase uncontrollable bridge-type 6-pulse rectifier charger widely used at this stage, taking the grid-side current phase A as an example, Fourier decomposition is performed, where ω is the curr...
Embodiment 2
[0045] see Figure 1-Figure 6 , the method for realizing harmonic suppression of an electric vehicle charger in this embodiment includes the following steps:
[0046] A. Construct the topological structure form of the charger with the single-phase PWM rectification method of the pre-LCL filter;
[0047] Such as figure 1 : LCL structure PWM rectifier charger topology diagram: e a , e b , e c is the three-phase power supply voltage of the grid, the inductance of the grid side and the rectifier side are L g , L, DC side current and load current are respectively i d and i L , u d is the DC side voltage, C is the DC side filter capacitor, C f It is an AC side filter capacitor, and six IGBTs form a three-phase bridge rectifier circuit. Compared with the phase-controlled rectifier, the charger based on the PWM rectification structure has the advantages of good harmonic suppression effect and high power factor.
[0048] B. Establish a mathematical model of a single-phase PWM...
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Abstract
The invention relates to a charger harmonic suppression control method. The invention discloses a harmonic suppression method for a charger of an electric vehicle. The harmonic suppression method comprises the following steps of: 1) constructing a charger topological structure form of a front LCL type filter single-phase PWM (Pulse Width Modulation) rectification mode; 2) establishing a mathematical model of the single-phase PWM rectification charger; 3) analyzing harmonic characteristics in the electric vehicle charger model; 4) analyzing a harmonic suppression method based on a PI current regulator, and establishing a charger system PI control structure; and 5) establishing a PWM rectification charger PIRC composite repetitive controller by adopting an RC and PI current composite control method, optimizing the duty ratio of PWM to suppress the generation of low-order harmonics, and applying the PWM duty ratio to the suppression of the grid-side current harmonics of the charger. The odd harmonic in the grid-side current of the PWM rectification charger can be well inhibited, the open-loop gain of an electric vehicle charger control system is increased, the steady-state and dynamic performance of the charger system is improved, zero-static-error tracking of the grid-side current of the charger is achieved, and the method has a certain promotion effect on popularization and application of electric vehicles.
Description
technical field [0001] The invention relates to the interdisciplinary research of power electronics technology, control science and technology, and belongs to the basic research and application exploration of new technologies in the field of intelligent control. In particular, it relates to a harmonic suppression control method for a charger. Background technique [0002] With the aggravation of energy crisis and environmental pollution, how to use energy efficiently and cleanly and achieve the purpose of environmental protection is related to the national economy, people's livelihood and sustainable development of the country. As a new energy vehicle, electric vehicles are one of the important directions for the development of the automobile industry, and have received strong support and attention from the Chinese government. The current structural form of PWM rectifier + DC / DC converter is the main development trend of the structural form of pure electric vehicle charger ...
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