Intelligent-microgrid-based wind power generation system

Abstract

The invention disclosed an intelligent-microgrid-based wind power generation system comprising a plurality of wind power generation units arranged in parallel and an energy-storage bidirectional converter having an electric energy input terminal and an energy storage input terminal. All wind power generation units are electrically connected with an energy storage input terminal of the energy-storage bidirectional converter; the electric energy input terminal is connected with an energy storage system for storing the electric energy; and the wind power generation units are connected with the energy storage input terminal by an energy storage line. Besides, PCS power controllers for outputting starting voltages stably in a balancing mode and detecting initial operation powers of the wind power generation units are connected to the energy storage line of the wind power generation units and the energy storage input terminal. According to the invention, the system can be started independently by be separated from the power grid; defects of randomness and intermittency of the distributed power supply can be effectively overcome; distributed power supply access can be realized; fluctuation of the smoothing system can be adjusted in real time; the balance of power generation and load inside the grid can be maintained; and the voltage and frequency stability is guaranteed.

Description

technical field [0001] The invention relates to the technical field of natural energy power generation, in particular to a wind power generation system based on an intelligent microgrid. Background technique [0002] Smart microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices. It is an autonomous system capable of self-control, protection and management. It can run in parallel with the external power grid or in isolation. From a micro perspective, a microgrid can be regarded as a small power system, which has complete power generation, transmission and distribution functions, and can achieve local power balance and energy optimization. The essential difference between it and a distributed power generation system with loads is that It has grid-connected and independent operation capabilities. [0003] As we all know, wind ...

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Problems solved by technology

[0005] In view of the deficiencies in the existing technology, the technical problem to be solved by the present invention is to provide a simple structure, which can be started independently from the power grid, effectively overcome the shortcomings of randomness and intermittency of distributed power sources, and solve the access problem of distributed power sources , adjust and smooth system fluctuations in real time, maintain the balance of power generation and load within the network, and ensure voltage and frequency stability. The safety requirements of the power system; when the micro-grid operates independently, it can use the energy storage link and the control and protection link to maintain its own stable operation of the wind power generation system based on the smart micro-grid

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