A power management system for intelligent power distribution of electric vehicle charging piles and charging piles equipped with the system

Abstract

The invention discloses a power management system for intelligent power distribution of electric vehicle charging piles, which includes a monitoring server (1), a data acquisition module (2), a three-phase circuit sharing power supply distribution module (3), a mobile handheld terminal (4) and The charging pile (5); the three-phase circuit sharing power distribution module (3) includes the power gating switch controller (7) and the three-phase circuit gating switch (6); at the same time, the power supply connection is reasonably adjusted according to the load conditions of each phase power supply A certain phase of the power supply can achieve a balanced load, so that the time-sharing charging power supply for charging can provide more loads for the charging pile, and protect the technical effect of the power supply, thereby improving the working stability of the charging pile.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to a power management system applied to intelligent power distribution of electric vehicle charging piles. Background technique [0002] In recent years, with the rapid development of my country's economy, there are more and more cars in big cities, and more and more exhaust gas is produced by burning petroleum products by fuel vehicles, which leads to more and more serious air pollution. For this reason, the government began to guide people to develop new energy vehicles with electric vehicles as the main means of transportation. [0003] It is against the background of this mission that new energy vehicles appear, including hybrid new energy vehicles and pure electric vehicles. Since pure electric vehicles only use the electric energy of the battery as the energy for driving the vehicle, they will not There is no exhaust gas, so it will not pollute the air, whic...

AI Technical Summary

Problems solved by technology

At the same time, the unbalanced three-phase load may cause serious consequences of burning the transformer: due to the unbalanced phase current of the heavy load is too large (increased by 3 times), and the overload is too much, it may cause overheating of the winding and transformer oil

The overheating of the winding will accelerate the aging of the insulation; the overheating of the transformer oil will cause the deterioration of the oil quality, rapidly reduce the insulation performance of the transformer, and reduce the service life of the transformer (every time the temperature rises by 8°C, the service life will be reduced by half), or even burn the winding.

[0006] In addition, the unbalanced operation of the three-phase load will cause the zero-sequence current of the transformer to be too large, and the temperature rise of local metal parts will increase: the transformer under the unbalanced operation of the three-phase load will inevitably generate zero-sequence current, and the existence of zero-sequence current inside the transformer , will generate zero-sequence magnetic flux in the iron core, and these zero-sequence magnetic flux will form a loop in the oil tank wall of the transformer or other metal components

However, when the distribution transformer is designed, these metal components are not considered as magnetic components, and the hysteresis and eddy current loss caused by this will make these components heat up, resulting in an abnormal increase in the temperature of the local metal parts of the transformer, which will lead to transformer operation accidents in severe cases.

[0007] At the same time, for high-voltage lines, this will increase the loss of high-voltage lines, increase the number of high-voltage line trips, and reduce the service life of switchgear: the unbalanced three-phase load of the low-voltage power grid may cause excessive current in a high-voltage phase, resulting in high-voltage line overcurrent tripping and power failure , causing large-scale power outages, and frequent tripping of switchgear in substations will reduce service life

In addition, the power supply enterprises directly manage households, and the loss of the low-voltage power grid will be large, which will reduce the economic benefits of the power supply enterprises, and even cause the power supply enterprises to operate at a loss

The agricultural electrician contracted the line loss, the line loss was high, the agricultural electrician bonus was withheld, and even the wages were not paid, which will inevitably affect the mood of the agricultural electrician, ranging from negative work to work, and serious crimes in order to get money

Transformer burnout, line burnout, and switchgear burnout, on the one hand, increase the power supply cost of the power supply company, on the other hand, power outages for maintenance, purchase and replacement cause long-term power outages and less power supply, which not only reduces the economic benefits of power supply companies, but also affects The reputation of the power supply company

For users, unbalanced three-phase loads and one or two phases are abnormally heavy, which will increase the voltage drop in the line, reduce power quality, and affect the use of electrical appliances by users.

Transformer burnout, line burnout, and switchgear burnout will affect the power supply of users, causing inconvenience at the slightest level, and causing relatively large economic losses, such as the death of farmed animals and plants caused by power outages, or penalties for failure to supply goods according to the contract, etc.

The blown neutral line may also cause a large number of low-voltage electrical appliances to be burned.

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