Large-scale distributed flexible wind and light storage, charging and discharging commercial power alternating current and direct current hybrid system based on energy cloud interconnection and control system

Abstract

The invention discloses a large-scale distributed flexible wind and light storage, charging and discharging commercial power AC / DC hybrid system and control system based on energy cloud interconnection. The system comprises a multi-megawatt battery energy storage converter and a wind and light storage integrated system which are complementary, a transformer-free high-voltage direct-hanging battery energy storage power conversion system, an AC micro-grid and a DC micro-grid. High voltage and high power are achieved, the voltage and the power are automatically adjustable, the intelligent power grid and the optical storage are bidirectionally complementary in charging and discharging, and uninterrupted power supply is achieved.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution of the smart grid of the Internet of Things, and relates to a large-scale distributed flexible wind-solar storage charging and discharging mains AC-DC hybrid system and control system based on energy cloud interconnection. Background technique [0002] With the in-depth development of the dual-carbon process, the DC distribution network is strongly returning to the large power grid, and renewable energy storage types such as distributed optical storage charging and discharging are ushering in a rapid development period. The normal power distribution system of the future. Photovoltaic storage charging and discharging system has become a research hotspot to improve the friendliness of photovoltaic system and adjust the power quality of power grid, and to evaluate large-scale distributed flexible photoelectric storage charging and discharging system based on the dual carbo...

AI Technical Summary

Problems solved by technology

The above method also needs to refer to the sector information where the space vector is located in each sampling period, and involves a lot of resources and massive calculations to obtain the frequency, phase and amplitude of each phase, which makes the system more complex and cannot meet the requirements of access The conditions of the smart grid and the Internet of Things, access to the smart grid and the Internet of Things loads and electrical equipment cannot perform high-precision power metering and carbon neutral evaluation

The existing SVM vector control converters have high power consumption, frequency offset, low inverter efficiency and low precision, and cannot meet the needs of smart grids, optical storage charging and discharging systems connected to smart grids, electric energy metering, and real-time evaluation of carbon neutrality. Spectrum leakage and grid rot effect, phase shift and frequency band aliasing cannot be avoided, and cannot be used for estimation of harmonic and interharmonic frequencies

The existing technology cannot measure electric energy bidirectionally. Electric energy metering of different rights of smart grid, inverter, energy storage, converter, charging pile, building users, and different industrial equipment

[0008] The existing solar (wind) storage charging and discharging system is container-type, and the development of high voltage, ultra-high power, and a variety of battery hybrid energy storage solar (wind) storage charging and discharging systems is a hot spot in the future trend. The fluctuation of the DC bus affects the life and stability of the energy storage system

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