A charging pile system and its control method

Abstract

The invention discloses a charging pile system and a control method thereof. The working mode of the system is determined through ground voltage frequency detection of the two ends of sub-grids, the power between the sub-grids is regulated by operation of the five modes of a conventional control mode, a self-healing mode, an overload mode, an off-grid mode and a grid-connected mode so as to enhance the stability and the self-healing performance of the grids, the sub-grids of different voltage levels and frequency levels can be compatible and fused and the objective of power information interaction can be achieved. Besides, the mode of parallel connection of multipath circuits is adopted in the system, and the working characteristics between the load power supplies can be controlled in a coordinated way through energy management of the bus voltage. Meanwhile, the system has an electric energy measuring mode and can be used for characteristic switching of the load power supplies, and has the control modes of being compatible with new energy, automatically allocating output power and parallel inputting of multiple types of energy and can maintain the flexibility and the safety in switching.

Description

technical field [0001] The invention relates to the field of charging piles, in particular to a charging pile system and a control method thereof. Background technique [0002] With the deepening of the global energy crisis, the depletion of oil resources and the increasing harm of air pollution and global temperature rise, governments and automobile companies generally recognize that energy saving and emission reduction are the direction of future automobile technology development, and the development of electric vehicles will be The best way to solve these two problems. my country attaches great importance to the development of electric vehicles, and the country has issued a series of standards to support and regulate the development of electric vehicles. In the draft "Energy Conservation and New Energy Vehicle Industry Planning", it is pointed out that pure electric vehicles will be the main strategic orientation. Relevant experts pointed out that there are three major ...

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Problems solved by technology

Relevant experts pointed out that there are three major bottlenecks in the development of pure electric vehicles: one is the lack of standards, the other is the imperfection of supporting policies, and the third is the orderly advancement of infrastructure planning and construction

The Ministry of Finance, the Ministry of Science and Technology, the Ministry of Industry and Information Technology, and the National Development and Reform Commission jointly issued a notice, intending to exempt the restriction policies such as car lottery and traffic restrictions on electric vehicles; it shows that the country has spared no effort in policy support for the promotion of electric vehicles, but the development of the electric vehicle market There are still many difficulties, one of the important reasons is that the construction of convenient charging facilities lags behind, so it is necessary to strengthen the construction of charging facilities

[0003] To this end, the country has begun to build charging piles and install them in various residential areas and public places to provide electric vehicles with relevant infrastructure for charging electric vehicle users; however, the existing traditional charging piles do not have the function of automatically adjusting the output power limit , because the same power grid is generally used in a region, and the same power grid is connected to several sub-grids, but the frequency and voltage of each sub-grid will also change due to different developments in the region, and it is easy to connect sub-grids in parallel The generation of hedging leads to the instability of the power grid, which will affect the quality of charging electric vehicles by the charging piles distributed under each sub-grid; There is a problem of excess; but the quality of the sub-grid in rural areas is poor, the charging effect of electric vehicles is not good, and it is easy to have a bad impact on the life of electric vehicles and batteries; it is impossible to automatically deploy charging piles under the grid at the same time The high power peak value during high power output cannot rationally apply energy, resulting in waste of energy; and there is still insufficient flexibility and safety when switching power loads

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