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With the development of Enclosed Electric Vehicle, the power grid can bear a lot of load
- Aug 29, 2018 -

One of the hottest topics in recent years has been electric cars.

All kinds of electric vehicles, whether imported, joint venture or domestic, are emerging in a new field.

However, if you think about it, there may be many more powerful and better ways to achieve the realization of new energy vehicles and electric modes, which is better than electric mode. Is the large-scale development of electric vehicle projects environmentally friendly or costly?


In terms of data, China sold 578,000 new energy passenger vehicles in 2017, up more than 72 percent year-on-year, accounting for 49 percent of global sales.

There is no doubt that the number of new energy vehicles, especially electric vehicles, will grow rapidly in the coming period, which is bound to have a great impact on the power grid.

So what should the grid do in the age of electric vehicles?


On July 12, the natural resources defense council (NRDC) and its Chinese energy research institute co., LTD. Jointly issued "the electric car development impact on the distribution network and benefit analysis report, senior policy analyst at the NRDC jinheng beauty introduced the main content of the report, the expert is" car - pile - net "interactive mode expressed own view.


"The report mainly studies the impact of charging infrastructure on the power grid from three aspects: the impact on the overall power grid, the impact on the distribution network, and the impact on the power supply service," jin said.




(electricity characteristics of various charging infrastructure)


Impact on the overall grid.

In the case of out-of-order charging, the state grid corporation's operating regional peak load increased by 13.61 million kw and 153 million kw by 2020 and 2030.

In terms of sub-regions, accelerated development regions accounted for the largest proportion, over 62% and 58%.

According to the sub-facility, the dispersed special charging piles account for the largest proportion, about 68% and 75%.


Impact on distribution network.

The accumulative charging of electric vehicles may cause load stress in local areas, and the overlapping charging time of electric vehicles or charging behavior during peak load will increase the burden of distribution network.


On the one hand, the existing public power distribution network and user-side power distribution facilities did not take ev charging demand into consideration when they were built in that year, and the development of ev led to the need of capacity increase and transformation of local power distribution network in some regions.

On the other hand, the large power and non-linear load equipment of ev charging facilities, which is distributed and distributed, will generate high harmonic current and impact voltage, and there are problems such as users' private cable and flying-wire charging, which bring great challenges to power grid company's distribution side management.


Impact on power service.

First of all, a large number of individual users have small capacity of "scattered newspaper installation", which sharply increases the workload of expanding service of power grid companies, and puts forward higher requirements for the service system of power grid companies.

Secondly, the fair disposal of some existing public power capacity may be unfair to "latecomers".

Finally, there will be a large number of problems of "switching power supply" or managing multiple power users on the same site, which will increase the complexity of marketing services.


The average battery capacity of a pure electric vehicle is 41 degrees, with an average of 10 degrees per day in the summer.

In other words, the power required to fill a pure electric car every day is roughly equal to that of four air conditioners.

According to the current static statistics, the total power generation of our country is still enough, but our demand and use of electricity are extremely unbalanced, especially when the urban power grid is under heavy load in the extreme weather for a long time.

Under the current technical conditions, slow charging of pure electric vehicles takes about 6-8 hours, and the long time load occupied by slow charging is the most likely factor to lead to power failure due to insufficient power load of the grid.


At present, the state has given great policy support to the development of new energy vehicles, which has led many automobile manufacturers and new forces of automobile manufacturing to invest in the research and development of new energy vehicles.

According to incomplete statistics, the planned capacity of local investment in new energy vehicles has exceeded 7.8 million.

However, while vigorously developing new energy vehicles, we should always keep in mind the original intention of developing new energy vehicles, in order to truly save energy, reduce emissions and reduce environmental pollution.


To prepare for a rainy day, relevant government departments should consider more about the demand of new energy vehicles on the grid load when making policies;

New energy vehicle manufacturers should actively develop charging technologies that are less time-consuming and more efficient and less reliant on the power grid.

Power suppliers will also need to develop better transmission networks and technologies to meet increasing demand