The way of charging cable control inside the charging pile

China [CN]

In order to meet the charging performance requirements of electric vehicle power battery, the rectifier inside the charging pile must have good steady-state performance and fast dynamic following characteristics. In addition, the current harmonic distortion rate of the input side should be within the range required by the national grid. Three-phase voltage PWM rectifiers are widely used in the field of rectification inside charging piles for their excellent sinusoidal AC-side current, stable and adjustable DC-side voltage output, and the ability to work at unit power factor.

The control method of three-phase voltage PWM rectifier determines the performance of rectification system. The control scheme of voltage outer loop and current inner loop is simple in structure, but when the AC side inductor is saturated, it has a greater impact on the control system and the voltage outer loop. The nonlinearity of the loop also limits the performance of the control system. Direct power control has been intensively studied by domestic and foreign scholars for its good dynamic response performance and high efficiency. Traditional direct power control uses power hysteresis to select the voltage vector in the switching table, i.e., a switching table needs to control both active and reactive power, the

Technical implementation elements.

To address the shortcomings of the above PWM rectifier control method, the present invention proposes to introduce DC control instead of hysteresis loop control in the control system of a three-phase voltage-based PWM rectifier. In addition, an improved power control algorithm is proposed in the two-phase static coordinate system, which eliminates the decoupling link in the phase-locked loop and the inner-loop current control on the grid side and simplifies the control system. Repetitive control is also incorporated in the control system to reduce the harmonic distortion of the grid-side current and improve the power quality of the rectifier and the steady-state performance of the control system.

To achieve the purpose of the claim

Of course, change the future pattern less the development of the industry in the field of charging, such as more electric vehicle connectors, charging piles and the development of the role of charging cables.

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