Inductance separating type integrated vehicle-charging topological and inductive parameter identification method

A technology for on-board charging and inductance parameters, applied in electric vehicle charging technology, charging stations, electric vehicles, etc., can solve the problems of missing inductance parameters, inability to start operation, etc., and achieve the effect of improving voltage quality

Active Publication Date: 2019-05-10
TIANJIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The grid-side three-phase inductance required by the PWM (pulse width modulation) rectification and charging controller of the on-board charging system is not fixed and correspondingly determined, and the inductance parameters required by the PWM rectification are lost in the on-board converter controller and cannot be started. Running the PWM rectifier

Method used

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  • Inductance separating type integrated vehicle-charging topological and inductive parameter identification method

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Embodiment 1

[0037] In order to reduce the power electronic devices for extra high-power charging and make the ground AC charging device integrated with "removal of power electronics", the embodiment of the present invention proposes a three-phase grid-side inductor separated from the charging converter. The topological structure of the on-board charging system, and the identification method for this structure, see figure 1 , the method includes the following steps:

[0038] 101: Integrating the electrical constraints of electric drive and charging, when the output terminals a, b, and c of the electric drive converter of the interface AC motor are switched to the ground three-phase random inductance terminal, and the input and output of the bidirectional DC converter are electrically isolated , the power flow paths under the electric drive and charging modes are combined into one, forming an integrated on-board charging system topology of equal power (charging power can reach electric driv...

Embodiment 2

[0049] Combine below Figure 2-Figure 5 The scheme in Example 1 is further introduced, see the following description for details:

[0050] based on figure 2 In the topological structure of the electric drive system of the electric vehicle shown, the power flow paths of the power battery during external charging and electric drive are independent of each other, and have the redundancy of combining the two power flow paths into one. In the electric drive mode, the power flow of the power battery flows through the bidirectional DC converter and the electric drive converter, and there are electrical constraints on the bidirectional flow of power; in the charging mode, the power flow of the grid flows to the power battery through an external charging device, and there is Electrical constraints of battery side electrical isolation and wide range adjustable terminal voltage.

[0051] Combining the electrical constraints of electric drive and charging, the figure 2 When the outpu...

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Abstract

The invention discloses an inductance separating type integrated vehicle-charging topological and inductive parameter identification method. The method comprises the following steps: when output endsa, b, c of an electrically driven converter of an interface alternating current motor are switched to a ground three-phase random inductor end, and the input and output of a bidirectional direct current converter are electrically isolated, combining power flow paths in the electrically driven and charging modes into one, and forming an equal-power integrated vehicle-charging system topology in which a three-phase network side inductor is separated from a PWM rectifier; after the random inductor is connected into a vehicle integrated charging rectifier, pre-charging a direct current bus capacitor; acquiring a three-phase voltage, current and direct current bus voltage instantaneous information of the network side, according to an instantaneous mathematical model of a three-phase static coordinate system of an uncontrolled rectifier, orderly building an instantaneous voltage loop equation of adjacent two-phase uncontrolled rectifiers; and a controlled rectification stage is based on a three-phase uncontrolled rectification instantaneous voltage loop equation, a controllable rectification stage is based on an integral mathematical model of the three-phase PWM rectifier under a two-phase static coordinate system, respectively performing on-line identification of an initial value and a fluctuation value of the three-phase random inductor by using the curve fitting and a recursive form of a least square method.

Description

technical field [0001] The invention relates to the field of topology and control technology of power electronics technology, in particular to an inductance-separated integrated vehicle charging topology and an inductance parameter identification method. Background technique [0002] With the rapid economic growth and the rapid development of society, the demand and consumption of energy are increasing. At the same time, the per capita car ownership in the world is increasing. The current automobile still uses fossil fuels as the main energy source, and the environmental problems caused by excessive use of fossil energy are becoming more and more serious. New energy vehicles use renewable energy as the power source and can achieve clean and pollution-free operation. They are considered to be one of the new modes of transportation that can effectively alleviate the energy crisis and environmental pollution. [0003] Electric vehicle charging technology is also gaining more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H02M7/06H02M7/217B60L53/22
CPCY02T90/14
Inventor 张云姚川恒宋天宝
Owner TIANJIN UNIV
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