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Electric vehicle charging equipment based on load virtual synchronous machine technology and control method

A virtual synchronous machine and electric vehicle technology, applied in the field of electrical engineering, can solve problems such as lack of system inertia, voltage stability of renewable energy power systems, and reduction of rotational inertia

Inactive Publication Date: 2020-04-07
CHINA ELECTRIC POWER RES INST
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Provide a solution to the problem of lack of system inertia in the new generation power system
[0006] (2) To a certain extent, solve the problems of voltage stability, wind and light abandonment, moment of inertia reduction, and weak grid connection problems in renewable energy power systems

Method used

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  • Electric vehicle charging equipment based on load virtual synchronous machine technology and control method
  • Electric vehicle charging equipment based on load virtual synchronous machine technology and control method
  • Electric vehicle charging equipment based on load virtual synchronous machine technology and control method

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Embodiment Construction

[0138] In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

[0139] Aiming at the problem that traditional charging piles cannot participate in grid regulation, the present invention proposes an electric vehicle charging equipment based on load virtual synchronous machine technology, which makes electric vehicle charging equipment abnormal in grid frequency / voltage, active power / reactive power through load virtual synchronous machine technology In order to cope with the dynamic adjustment of the power grid, corresponding responses should be made.

[0140] The charging circuit of the load virtual synchronous machine electric vehicle charging equipment adopts a two-pole converter circuit; the two-pole converter circuit includes an active digital Vienna rectifier and a digital full-bridge LLC resonant converter. The active digital Vienna rectifier is a...

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Abstract

The invention discloses electric vehicle charging equipment based on a load virtual synchronous machine technology and a control method. A charging circuit of the electric vehicle charging equipment is a two-stage converter circuit; the two-stage converter circuit comprises an active digital Vienna rectifier and a digital full-bridge LLC resonant converter. Controlling the active digital Vienna rectifier in the electric vehicle charging equipment comprises the following steps: obtaining a given value of active power through PI control based on a direct current side voltage and a reference value of the direct current side voltage; controlling the given value of the active power by an active control loop, a reactive control loop and a voltage and current double-closed loop to obtain a reference instruction value of a current inner loop; comparing the reference instruction value of the current inner loop with the feedback current value of an inductor, and then generating a voltage modulation wave signal through a proportional link; and modulating the voltage modulation wave signal to generate a PWM signal to drive the on-off of a switching tube. According to the invention, the electric vehicle charging equipment follows the fluctuation of the direct-current side voltage.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to an electric vehicle charging equipment and a control method based on load virtual synchronous machine technology. Background technique [0002] The existing power system has the following three defects: First, it is estimated that 90% of the power in the new generation of power systems will be used after power electronic conversion, and an increasing proportion of power electronic equipment will be connected to power system, leading to the diversification of power conversion interface devices and the trend of strong nonlinear load, and at the same time causing the lack of system inertia, which makes the safety and stability of large power grids face huge challenges; second, with the development of renewable energy distributed power generation technology With continuous development, a large amount of renewable energy is connected to the power system. Compared with traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L53/62B60L50/53
CPCB60L50/53B60L53/62Y02T10/70Y02T10/7072Y02T10/72Y02T10/92Y02T90/12
Inventor 周珊吕志鹏吴鸣孙丽敬宋振浩刘国宇
Owner CHINA ELECTRIC POWER RES INST
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