Wind-light storage combined dispatching method and system used for distributed microgrid island operation

Abstract

The invention belongs to the field of distribution network dispatching and managing, which provides a wind-light storage combined dispatching method and system used for distributed microgrid island operation. According to collected real-time data as well as photovoltaics and fan power generation and power load prediction data obtained by calculation, the total output power of photovoltaics and fan and a load and energy storage inverter system are coordinated and controlled to satisfy the requirement of system power balancing; the energy storage and the load of the photovoltaics, a fan and a storage cell are considered in a coordinating mode; a control signal is emitted to cause each inverter to output active power required by a microgrid system to achieve the optimal energy use ratio; therefore, the microgrid system can integrate the power generation and power consumption situations between three systems of a fan system, a photovoltaic system and an energy storage system and load so as to coordinate each subsystem to effectively operate; when an external grid is detected to restore to be normal, the microgrid system is switched to a grid-connected operation mode according to a grid-connected and island mode switching control strategy, and the economy and the stability of the microgrid system in the island mode can be improved.

Description

technical field [0001] The invention belongs to the field of dispatching and management of distribution networks, and in particular relates to a method and system for joint dispatching of wind, wind and storage in isolated island operation of distributed microgrids. Background technique [0002] A micro-grid system consisting of photovoltaic power generation system, wind power generation system, battery energy storage and loads. The power generated by the photovoltaic power generation system and wind power generation system is greatly affected by the weather, which will cause differences in the power supply and power load of the micro-grid system. balance. When the microgrid is in island operation mode, the battery energy storage system is the voltage reference source during operation, and the frequency and voltage of the microgrid are controlled to keep constant. If the generated power is greater than the load power, it will cause the reverse power of the battery energy sto...

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Problems solved by technology

[0004] The present invention provides a method and system for combined scheduling of wind, solar and storage in distributed microgrid isolated island operation, aiming to solve the problem that the control method of the existing microgrid system in the isolated island operation mode is relatively simple, and only the active power balance of the microgrid is considered , there is no in-depth study of microgrid system optimization control and economic scheduling, it is difficult to meet the needs of microgrid operation in the island operation mode, and the maintenance investment of the system is relatively large

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