Cascade utilization energy storage system with power capable of inputting power step by step

Abstract

The invention discloses an echelon utilization energy storage system capable of inputting power step by step, and aims to solve a problem that an existing echelon battery is unstable due to the difference between a new battery and an old battery in the aspects of discharge rate, self reliability, battery consistency and the like. A current power grid working state is judged, the power demand quantity of a power grid bus in a future time period is predicted, the high-power demand quantity is reported to a monitoring device and compared with a preset power threshold value, so directivity judgment of power is made, and according to the judgment result, a control instruction is sent to control an operation state and the power direction of each power conversion sub-device in the multi-stage power conversion device, and the input number of the power conversion sub-devices is flexibly controlled, so the output power of the power converter is controlled, and the effect of step-by-step input is achieved; and problems of over-high discharge rate, over-high temperature, poor consistency and the like caused by quality difference of the batteries are avoided.

Description

technical field [0001] The invention belongs to the technical field of energy power supply, in particular to a cascade utilization energy storage system in which power can be input step by step. Background technique [0002] In the general direction of global green and low-carbon transformation, my country has continuously increased its independent contribution and actively adopted more powerful policies and measures. Increasing the proportion of renewable energy such as wind power and photovoltaics, actively developing new energy vehicles, and vigorously developing the energy storage industry are undoubtedly effective means and ways to accomplish this task. With the continuous development of the new energy industry, the cascade utilization of energy storage batteries has a large room for development, both in terms of technology and cost control. [0003] However, there is no obvious difference between the energy storage system for cascade utilization batteries and the ener...

AI Technical Summary

Problems solved by technology

[0003] However, there is no obvious difference between the energy storage system for cascade utilization batteries and the energy storage system for new batteries in terms of control strategy and main structure.

In terms of peak-valley arbitrage, backup power, virtual capacity expansion, etc., the two energy storage systems using old and new batteries have good performance, but it must be noted that echelon batteries have good performance in terms of discharge rate, self-reliability, and battery consistency. Significant difference compared to new battery

Images