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Load virtual synchronous generator system applied to electric vehicle charging pile and control method

A technology of synchronous generator and virtual synchronization, which is applied in the direction of electric vehicle charging technology, electric vehicle, power network operating system integration, etc., can solve the problems of weakened ability of grid voltage disturbance and weakened ability of suppressing grid frequency disturbance, etc., to achieve suppression Transient overcurrent, flexible and diverse operating modes

Inactive Publication Date: 2018-09-28
西安翌飞核能装备股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The ability to suppress power grid frequency disturbances tends to weaken, which can easily cause frequency stability problems
[0004] 2) The ability to suppress grid voltage disturbances tends to weaken, which can easily lead to voltage stability problems

Method used

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  • Load virtual synchronous generator system applied to electric vehicle charging pile and control method
  • Load virtual synchronous generator system applied to electric vehicle charging pile and control method
  • Load virtual synchronous generator system applied to electric vehicle charging pile and control method

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] see figure 1 , using bidirectional DC / DC+bidirectional DC / AC two-stage main circuit topology, specifically refers to: in order to meet the requirements of energy bidirectional flow, DC voltage wide range conversion and charging pile participating in grid frequency and voltage regulation, the pre-stage DC / DC Adopt isolated or non-isolated topology, and the subsequent DC / AC adopts three-level or conventional two-level topology, while the energy of conventional charging piles can only flow in one direction, and the ability to participate in grid frequency regulation is very limited.

[0037] Refer to the following as figure 2 , each link of the present invention is described respectively.

[0038] Based on the DC / AC interface of the charging pile, the rotor motion equation and the electromechanical equation model are respectively established, as follows:

[003...

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Abstract

The invention provides a load virtual synchronous generator system applied to an electric vehicle charging pile and a control method. The charging pile is of a bidirectional DC / DC and bidirectional DC / AC two-stage main circuit topological structure; a virtual synchronous generator control technology is applied to the bidirectional DC / AC interface of the charging pile; a virtual impedance technology is introduced into a rotational coordinate system; and therefore, multi-charging pile parallel operation and reactive power equalization distribution is realized, and at the same time, transient overcurrent in a fault state can be effectively suppressed. With the load virtual synchronous generator system and control method of the invention adopted, on the one hand, the whole charging pile has inertia / damping, primary frequency modulation and reactive power voltage regulation functions and externally exhibits the external characteristics of the virtual synchronous generator, and on the otherhand, the failure of the equalization distribution of reactive power caused by a large-scale charging pile cluster can be effectively avoided; and therefore, the improvement of the voltage and frequency stability of a power grid can be benefitted, and a foundation is laid for the connection of larger-scale charging pile loads. The method is simple and effective, and is conducive to engineering application.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and in particular relates to a load virtual synchronous generator system and a control method applied to electric vehicle charging piles. Background technique [0002] In recent years, my country's electric vehicle industry has developed continuously and rapidly. As an electric load, electric vehicles are not only consumers of electric energy, but also producers of electric energy, and they are more controllable, interactive and active. However, large-scale electric vehicles are connected to the power grid in disorder, and their dynamic response characteristics and static output characteristics are significantly different from those of conventional synchronous generators, which have a greater impact on the operation stability and power supply adequacy of the power grid, mainly as follows: [0003] 1) The ability to suppress the frequency disturbance of the power grid tends to be weakened, wh...

Claims

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Application Information

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IPC IPC(8): H02J3/14H02J3/16H02J3/24H02J3/32B60L11/18
CPCH02J3/14H02J3/16H02J3/24H02J3/32B60L55/00H02J2203/20Y04S20/222Y04S30/12Y04S30/14Y02B70/3225Y02E40/30Y02T90/167
Inventor 阚忠杰阚啸李翔
Owner 西安翌飞核能装备股份有限公司
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