Method and system capable of optimizing and controlling micro-network energy-storage system

Abstract

The invention belongs to the field of power distribution network scheduling and management, and provides a method and a system capable of optimizing and controlling a micro-network energy-storage system. In full consideration of a distributed power supply and the characteristics of the energy-storage system, through real-time data monitoring for the active power outputted by a photovoltaic power generation system and a wind power generation system as well as the active power of the storage battery terminal voltage and the energy-storage system, combined with user' side requirement response, the requirement for stabilizing power network power and projection data of electricity utilization load, the optimization and control for the energy-storage system are realized, so the requirement of a micro-network system power balance is met, the impact on an external power network from the micro-network system is reduced, safe operation of the whole power network is ensured, the requirement of the micro-network system stabilizing the power network power fluctuation and the requirement of demand side response are met, the operation time of the micro-network system in an insulted inland is greatly prolonged, the service life of the storage battery is prolonged, and the operating stability, compatibility and economical efficiency of the micro-network are improved. Therefore, the invention has better practical significance for the popularization and application of the energy-storage system in the micro network.

Description

technical field [0001] The invention belongs to the field of distribution network dispatching and management, and in particular relates to a method and system for optimally controlling a microgrid energy storage system. Background technique [0002] The current micro-grid energy storage system is not perfect in the control scheme. In the grid-connected operation mode, the real-time data monitoring, power generation and power load prediction are insufficient, which makes it easy to cause grid power fluctuations and impact on the grid; in the 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. The existing microgrid energy storage system has a rationality problem in the control scheme. If the power generated is greater than the load power, the battery energy storage system will reverse. power, which affects the stable operation of the microgrid...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method and system for optimal control of a micro-grid energy storage system, aiming to solve the problem that the micro-grid energy storage system provided by the prior art can easily cause grid power fluctuations in the grid-connected operation mode. The power grid causes impact; in the island operation mode, there are also problems such as the reverse power of the energy storage system, and the discharge current of the battery pack is far greater than the optimal discharge current, which affects the stable operation of the microgrid system, shortens the operating time of the microgrid island, and will The problem of reducing the service life of the battery pack and increasing the investment in system maintenance

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