阅读说明：本技术 一种10kV中压直挂式电动汽车充电站系统 (10kV medium-voltage direct-hanging electric vehicle charging station system ) 是由 范建华 徐鹏飞 李健勋 王庆园 李鸿儒 张建 李伟 吴雪梅 卢峰 林志超 程艳艳 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种10kV中压直挂式电动汽车充电站系统。该系统包括10kV电动汽车充电站前级和DC/DC电动汽车充电桩,10kV电动汽车充电站前级输入端直接连接10kV电网,其输出端连接DC/DC电动汽车充电桩,DC/DC电动汽车充电桩输出端连接电动汽车给电动汽车充电。具有谐波含量低、高低压故障隔离、易于维护、能量双向传送等优势。本发明可组建智能微网,可调可控,实现能量路由、有序充电,减小对电网的冲击。(The invention discloses a 10kV medium-voltage direct-hanging type electric vehicle charging station system. The system comprises a 10kV electric vehicle charging station front stage and a DC/DC electric vehicle charging pile, wherein the input end of the 10kV electric vehicle charging station front stage is directly connected with a 10kV power grid, the output end of the 10kV electric vehicle charging pile is connected with the DC/DC electric vehicle charging pile, and the output end of the DC/DC electric vehicle charging pile is connected with the electric vehicle charging pile. The method has the advantages of low harmonic content, high-low voltage fault isolation, easiness in maintenance, bidirectional energy transmission and the like. The invention can construct an intelligent microgrid, is adjustable and controllable, realizes energy routing and ordered charging, and reduces the impact on the power grid.)

1. The utility model provides a 10kV middling pressure hanging electric automobile charging station system that directly, its characterized in that fills electric pile including 10kV electric automobile charging station preceding stage and DC/DC electric automobile, and 10kV electric automobile charging station preceding stage input lug connection 10kV electric wire netting, DC/DC electric automobile fills electric pile is connected to its output, and DC/DC electric automobile fills electric pile output and connects electric automobile and charge for electric automobile.

2. The 10kV medium-voltage direct-hanging electric vehicle charging station system according to claim 1, wherein the 10kV medium-voltage direct-hanging electric vehicle charging station system is free of a power frequency transformer; the passive device is subverted into an intelligent controllable active device and is used for realizing self-detection, self-diagnosis, self-protection and self-recovery of the whole machine; a cascade H-bridge topology is adopted for solving the problem of insufficient voltage resistance of a single power electronic device (IGBT).

3. The 10kV medium-voltage direct-hanging electric vehicle charging station system according to claim 1, wherein a two-stage lightning protection design is adopted for the relay protection device of the 10kV medium-voltage direct-hanging electric vehicle charging station system; the power module N-2 is designed in a redundant mode, and a redundant mode is seamlessly switched; monitoring the online insulation of key devices; the double isolation is safer, the state of the whole system is sensed, and the state maintenance is changed from the timing maintenance.

4. The 10kV medium-voltage direct-hanging type electric vehicle charging station system according to claim 1, wherein the 10kV medium-voltage direct-hanging type electric vehicle charging station system provides a flexible direct-current interface for accessing new energy such as energy storage, photovoltaic and wind power, the new energy is consumed on the spot, and the utilization efficiency of the new energy is improved; the intelligent micro-grid system can be conveniently established by matching with an energy storage battery and an EMS system, the functions can be flexibly configured in specific occasions (such as high-speed service areas) and the utilization rate of an energy storage power station is improved.

5. The system of claim 1, wherein the 10kV medium voltage direct-hanging electric vehicle charging station system comprises:

the intelligent speed regulation fan system intelligently regulates speed, and the fan wheel patrols the work;

the power module unit is in modular design, is installed in a drawer mode, and is inserted and pulled out of a contact finger;

safety protection measures, condensation prevention and humidity control;

the low-loss standby mode is adopted, the power is partially dormant when the standby mode is adopted, and the standby power consumption is less than 500W;

the anti-collision design is adopted, and when the equipment is impacted or inclined by 15 degrees, the power is automatically cut off;

the design of preventing soaking, when the machine case suffers from the water logging, the power is automatically cut off.

Technical Field

The invention relates to the field of charging station design, in particular to a 10kV medium-voltage direct-hanging type electric vehicle charging station system.

Background

A10 kV medium-voltage direct-hanging electric vehicle charging station system is mainly applied to a design scheme of an electric vehicle charging station. The 10kV medium-voltage direct-hanging type electric vehicle charging station is a novel intelligent charging station which realizes voltage transformation and energy transfer in a power system based on a power electronic transformation technology and an electromagnetic induction principle, and can also realize a plurality of functions such as reactive compensation, harmonic wave treatment, power grid interconnection, new energy grid connection, hot plug and the like compared with the traditional charging station.

Conventional electric vehicle charging stations are generally of the following construction: the power frequency transformer changes 10kV alternating current into 380V alternating current, and then the 380V alternating current is converted into direct current voltage required by the automobile through AC/DC + DC/DC for charging. In order to reduce the reactive and harmonic interference of the charging station to the power grid, reactive compensation equipment and harmonic suppression equipment are needed. And when the new energy and the energy storage equipment are required to be accessed in the charging station, the direct current provided by the new energy and the energy storage equipment is required to be inverted into alternating current. The defects of low conversion efficiency, large standby and no-load loss, high equipment cost, high construction cost, high maintenance cost and the like are brought.

Disclosure of Invention

In order to solve the problems, the invention provides a 10kV medium-voltage direct-hanging type electric vehicle charging station system.

The invention provides the following technical scheme:

the utility model provides a 10kV middling pressure hanging electric automobile charging station system that directly, its characterized in that fills electric pile including 10kV electric automobile charging station preceding stage and DC/DC electric automobile, and 10kV electric automobile charging station preceding stage input lug connection 10kV electric wire netting, DC/DC electric automobile fills electric pile is connected to its output, and DC/DC electric automobile fills electric pile output and connects electric automobile and charge for electric automobile.

Preferably, the system does not have a power frequency transformer; the passive device is an intelligent controllable active device and is used for realizing self-detection, self-diagnosis, self-protection and self-recovery of the whole machine; a cascade H-bridge topology is adopted for solving the problem of insufficient voltage resistance of a single power electronic device (IGBT).

Preferably, the relay protection device of the system adopts a two-stage lightning protection design; the power module N-2 is designed in a redundant mode, and a redundant mode is seamlessly switched; monitoring the online insulation of key devices; the double isolation is safer, the state of the whole system is sensed, and the state maintenance is changed from the timing maintenance.

Preferably, the system provides a flexible direct current interface for accessing new energy such as energy storage, photovoltaic, wind power and the like, the new energy is consumed on the spot, and the utilization efficiency of the new energy is improved; the intelligent micro-grid system can be conveniently established by matching with an energy storage battery and an EMS system, the functions can be flexibly configured in specific occasions (such as high-speed service areas) and the utilization rate of an energy storage power station is improved.

Preferably, the system comprises: the intelligent speed regulation fan system intelligently regulates speed, and the fan wheel patrols the work; the power module unit is in modular design, is installed in a drawer mode, and is inserted and pulled out of a contact finger; safety protection measures, condensation prevention and humidity control; the low-loss standby mode is adopted, the power is partially dormant when the standby mode is adopted, and the standby power consumption is less than 500W; the anti-collision design is adopted, and when the equipment is impacted or inclined by 15 degrees, the power is automatically cut off; the design of preventing soaking, when the machine case suffers from the water logging, the power is automatically cut off.

Compared with the prior art, the invention has the beneficial effects that: and the energy routing topology is adopted, so that the size and the weight of the whole machine are reduced, and the functions of self-detection, self-diagnosis, self-protection, self-recovery and the like of the whole machine are realized. Safe and reliable, and the state perception of the whole system is changed from 'timing maintenance' to 'state maintenance'. High efficiency, greatly reducing operator capital recovery time. An intelligent microgrid can be built, and the intelligent microgrid is adjustable and controllable, so that energy routing and ordered charging are realized, and the impact on a power grid is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

Fig. 1 is a topological structure diagram of a 10kV medium-voltage direct-hanging charging station;

FIG. 2 is an appearance structure diagram of a 10kV medium-voltage direct-hanging charging station;

fig. 3 is a design diagram of a scheme of a 10kV medium-voltage direct-hanging charging station.

Detailed Description

Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings.

The invention provides a 10kV medium-voltage direct-hanging type electric vehicle charging station system which can be used in the field of design of 10kV medium-voltage direct-hanging charging stations and has the advantages of low harmonic content, high-low voltage fault isolation, easiness in maintenance, energy bidirectional transmission and the like.

The topology structure diagram of the 10kV medium-voltage direct-hanging charging station applied by the invention is shown in fig. 1, the appearance structure diagram is shown in fig. 2, the scheme design diagram is shown in fig. 3, and the scheme in fig. 3 comprises the following steps:

the utility model provides a 10kV middling pressure hanging electric automobile charging station system that directly, its characterized in that fills electric pile including 10kV electric automobile charging station preceding stage and DC/DC electric automobile, and 10kV electric automobile charging station preceding stage input lug connection 10kV electric wire netting, DC/DC electric automobile fills electric pile is connected to its output, and DC/DC electric automobile fills electric pile output and connects electric automobile and charge for electric automobile.

The system has no power frequency transformer; the passive device is an intelligent controllable active device and is used for realizing self-detection, self-diagnosis, self-protection and self-recovery of the whole machine; a cascade H-bridge topology is adopted for solving the problem of insufficient voltage resistance of a single power electronic device (IGBT).

The relay protection device of the system adopts a two-stage lightning protection design; the power module N-2 is designed in a redundant mode, and a redundant mode is seamlessly switched; monitoring the online insulation of key devices; the double isolation is safer, the state of the whole system is sensed, and the state maintenance is changed from the timing maintenance.

The system provides a flexible direct current interface for accessing new energy such as energy storage, photovoltaic, wind power and the like, the new energy is consumed on the spot, and the utilization efficiency of the new energy is improved; the intelligent micro-grid system can be conveniently established by matching with an energy storage battery and an EMS system, the functions can be flexibly configured in specific occasions (such as high-speed service areas) and the utilization rate of an energy storage power station is improved.

The system comprises: the intelligent speed regulation fan system intelligently regulates speed, and the fan wheel patrols the work; the power module unit is in modular design, is installed in a drawer mode, and is inserted and pulled out of a contact finger; safety protection measures, condensation prevention and humidity control; the low-loss standby mode is adopted, the power is partially dormant when the standby mode is adopted, and the standby power consumption is less than 500W; the anti-collision design is adopted, and when the equipment is impacted or inclined by 15 degrees, the power is automatically cut off; the design of preventing soaking, when the machine case suffers from the water logging, the power is automatically cut off.

The system has no power frequency transformer in the aspect of energy routing topology, and the size and the weight of the whole machine are reduced; the passive device is subverted into an intelligent controllable active device, so that the functions of self-detection, self-diagnosis, self-protection, self-recovery and the like of the whole machine are realized; the cascade H-bridge topology is adopted to solve the problem of insufficient voltage resistance of a single power electronic device (IGBT), and the topology is mature and applied to products such as direct-current power transmission and distribution, high-voltage SVG (scalable vector graphics), high-voltage frequency converter and the like.

The safety and reliability are high, the relay protection device is complete and reliable, and the two-stage lightning protection design is adopted; the power module N-2 is designed in a redundant mode, and a redundant mode is seamlessly switched; an AFDD chip is developed autonomously, and key devices are subjected to online insulation monitoring; the double isolation is safer, the state of the whole system is sensed, and the state maintenance is changed from the timing maintenance.

In the aspect of high efficiency, the conversion efficiency of the 10kV direct-hanging charging station can reach more than 95.5 percent, the capital recovery time of operators is greatly shortened, and the investment return rate is improved.

In the aspect of high power density, no power frequency transformer is used, and the volume of the whole machine is reduced; the design of a standardized container occupies less land and is convenient to install; a high-frequency transformer is designed autonomously, so that the power density is improved; the mature heat dissipation air channel design improves the heat dissipation efficiency; the power density is 2-3 times that of the conventional charging station solution.

In the aspect of power grid friendliness, 25-level modulation technology can achieve THD less than 2% under half load, which is far lower than the national standard requirement; an intelligent microgrid can be built, and the intelligent microgrid is adjustable and controllable, so that energy routing and ordered charging are realized, and the impact on a power grid is reduced; the low voltage ride through function is realized; the reactive power compensation and harmonic suppression device has the functions of active reactive power compensation and harmonic suppression, and can realize 13-order internal harmonic suppression.

The energy routing is convenient for new energy access. A flexible direct current interface is provided, and access of new energy resources such as photovoltaic, wind power, energy storage and the like is facilitated; the new energy can be consumed on the spot without multi-stage conversion, and the utilization efficiency of the new energy can be improved; an intelligent micro-grid system can be conveniently constructed, energy routing is realized, and the defects of intermittent new energy, poor volatility, poor controllability and the like are overcome; the functions are flexibly configured on specific occasions (such as high-speed service areas and the like), and the utilization rate of the charging station is improved.

The flexible charging stack is designed to withstand voltage of 1700V of a power device, and can flexibly meet power expansion and voltage class upgrading (1000V platform); the voltage output range is 50V-750V, the constant power range is 400-750V, and the device is suitable for more vehicle types; the system has the advantages of small volume, no parking space occupation, man-machine interaction interface, simplicity, attractiveness and multiple payment modes; the anti-collision device has an anti-collision design, and when the equipment is impacted or inclined by 15 degrees, the power is automatically cut off; when the case is immersed in water, the power is automatically cut off.

The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention is similar to the above basic scheme, and it is obvious to those skilled in the art that the design of various modified models, formulas and parameters according to the guidance of the present invention does not require creative labor. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.