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Control method and system for AC-DC converter of charging pile

A technology of AC-DC and control method, which is applied in current collector, charging/discharging current/voltage regulation, electric vehicle, etc. It can solve problems such as detection current, distortion, and grid pollution that cannot be detected without error, and achieve fast adjustment speed, The effect of reducing the harmonic frequency and requiring low accuracy of device parameters

Inactive Publication Date: 2018-10-09
GUANGXI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, due to the defects of instantaneous current control itself, it is impossible to detect and track the current signal on the AC side without error during the inverter process. When the current signal crosses zero, the current will be distorted, which will cause a large amount of output current when feeding power to the grid. The second harmonic pollution grid

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  • Control method and system for AC-DC converter of charging pile
  • Control method and system for AC-DC converter of charging pile
  • Control method and system for AC-DC converter of charging pile

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] The embodiment of the present invention discloses a control method and system for AC-DC converters of charging piles, referring to figure 1 As shown, the circuit of the bidirectional AC-DC converter in the electric vehicle charging pile based on V2G technology selects a single-phase full-bridge circuit with electric energy feedback. Since the converter uses full-control switching components to modulate and control the pulse width, the system can have be...

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Abstract

The invention discloses a control method and a control system for an AC-DC converter of a charging pile, adopting double-loop control of current and voltage in direct current control and improvement thereof, wherein the outer loop is a PI-controlled voltage outer loop, and the inner loop is an improved PI-controlled quasi-PR-controlled current inner loop. By adopting the improved design method ofquasi-PR current loop, the accuracy of tracking current is greatly improved, and the current tracking ability of the system itself and the adaptability to different working environments are strengthened, which is very practical.

Description

technical field [0001] The present invention relates to the technical field of charging piles, and more specifically relates to a control method and system for AC-DC converters of charging piles. Background technique [0002] At present, the commonly used charging pile control technology is a control method based on DC current control technology, but it still has the disadvantage of second harmonic pollution to the power grid while realizing the bidirectional flow of energy. Shifting peaks and valleys of the power grid will help, and will also increase the harmonics of the power grid itself. [0003] There are currently many solutions for this deficiency, among which the most efficient is the control technology based on instantaneous current. The application of instantaneous current control is that the outer loop principle compares the output voltage value of the DC side with the initial command value and then passes through the PI regulator to maintain the stability of the...

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Application Information

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IPC IPC(8): H02J7/00H02J3/32H02J3/01B60L11/18
CPCB60L55/00H02J3/01H02J3/32H02J7/00H02J7/007Y02E40/40Y02T10/70Y02T10/72
Inventor 刘胜永崔志鹏
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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