Storage and charging integrated power system

Abstract

A power system includes a power generation system; an energy storage system which is provided with a super capacitor bank and a lithium battery device based on echelon utilization; a load system which is provided with a direct current quick charge interface; and an energy management system, wherein the energy storage system and the load system are respectively connected with the power generation system through a direct-current power transmission bus; the lithium battery device is connected to the direct-current power transmission bus through a first bidirectional direct-current chopper, and the super capacitor bank is connected to the direct-current power transmission bus through a second bidirectional direct-current chopper; the direct-current fast charging interface is connected to the direct-current power transmission bus through a load-side direct-current chopper; and the direct-current power transmission bus is connected to a main power grid through a power grid interaction device. According to the invention, by utilizing the renewable power generation resources and matching with the energy storage system composed of a decommissioned battery and a super capacitor, the power of a suburban charging station can be improved on the premise that the capacity of the existing power grid does not need to be expanded, and the popularization of new energy fast charging devices is promoted.

Description

Technical field [0001] The invention belongs to the technical field of power electronic control, and generally relates to a power system capable of generating electricity and supplying power, its ancillary equipment and a control method. The invention specifically relates to a hybrid power network system based on a complementary power generation system of decommissioned rechargeable batteries, supercapacitors and renewable energy and a control method thereof. Background technique [0002] Low-carbon green industries and technologies such as renewable energy power generation, energy storage and new energy vehicles have been vigorously developed in recent years. [0003] However, there are still many technical problems in the current development of the new energy industry. For example, for the new energy vehicle industry, the problems are: first, the charging time of electric vehicles is too long, as long as 4-12 hours in slow charging conditions, which is completely inconsis...

AI Technical Summary

Problems solved by technology

For example, for the new energy vehicle industry, the problem lies in: first, the charging time of electric vehicles is too long, and it can take up to 4-12 hours under the condition of slow charging, which does not meet the needs of long-distance travel at all; Charging will bring severe challenges to the existing grid capacity. In extreme cases, it will lead to grid overload, frequency drop, and even a power outage of the entire grid. Third, new energy power generation can increase the capacity of the grid, but its intermittent, Volatility has brought huge interference to the power grid; fourth, lithium-ion batteries have high energy density and are good media for energy storage systems, but there are also disadvantages such as low power density and high price

In addition, the lithium batteries used in electric vehicles have a service life of only 4-8 years and must be replaced after that. How to deal with a large number of these decommissioned power batteries is also a thorny problem faced by human beings.

[0004] For the booming new energy vehicle market, the development of a multi-functional system based on "power generation + energy storage + charging" has increasingly become the focus of industry research. However, there are still many defects and bottlenecks in the current technology, including at least the following points: 1. The occasions where fast charging is most needed for long-distance travel are inter-city suburbs or expressway service areas on national trunk lines. These areas are far away from residential areas, with wide sites and rich tourism resources, but insufficient power infrastructure facilities; second, single The advanced lithium battery energy storage system can meet the needs of high energy and long-term storage of electricity, but the high-frequency fluctuations of the new energy power generation system will cause frequent charging and discharging of the battery, resulting in a rapid shortening of the service life of the lithium battery; third, the brand new Lithium batteries, especially ternary lithium batteries, are expensive

Images