Microgrid new energy hybrid energy storage system

Abstract

The invention discloses a microgrid new energy hybrid energy storage system. The system comprises a new energy power generation subsystem, an energy storage subsystem, an energy conversion subsystem and a power distribution subsystem, wherein the new energy power generation subsystem comprises tie lines connected with each power supply loop. The system also comprises a disturbance detection moduleand a reactive power compensation module. The power output end of the new energy power generation subsystem is connected with the input ends of the tie lines through the disturbance detection module;front-end network nodes are arranged at the output ends of the tie lines; middle-end network nodes are arranged at the input end and the output end of the reactive compensation module respectively. The energy storage subsystem comprises capacitors with a number equal to the number of the power supply loops, wherein each capacitor is connected with a switching device, each switching device is provided with a rear-end network node, and the new energy power generation subsystem selects a corresponding reactive power compensation module to establish connection with the energy storage subsystem based on a detection result of the disturbance detection module. According to the system, power generation and load fluctuation can be stabilized on the basis of low cost, and the stable operation of amicrogrid is kept.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a micro-grid new energy hybrid energy storage system. Background technique [0002] Microgrid, also known as microgrid, refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection devices, etc. Microgrid is a system that can realize self-control, protection and management. autonomous system. As a complete power system, it relies on its own management and control for energy supply, and realizes functions such as power balance control, system operation optimization, fault detection and protection, and power quality management. The proposal of the microgrid aims to realize the flexible and efficient application of distributed power, solve the grid-connection problem of a large number and various forms of distributed power, and realize the large-scale acc...

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Problems solved by technology

However, these distributed power sources have a certain degree of randomness in power generation. Therefore, energy storage devices are required to stabilize power generation and load fluctuations and maintain stable operation of the microgrid through charging and discharging. Generation and Load Fluctuations

Although it can be alleviated by a large-capacity energy storage device, blindly increasing the capacity of the energy storage device also means a substantial increase in its manufacturing cost and maintenance cost

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