Micro-grid flexible grid-connected control method based on integrated control on common connecting point position

Abstract

The invention discloses a micro-grid flexible grid-connected control method based on integrated control on a common connecting point position. An energy storage system and an SSTS are arranged at the position of a PCC, reactive power is sent to the power distribution grid by utilizing complete micro grid and power distribution grid electric quantity information which can be acquired at the common connecting point position of a micro grid and a power distribution network and stored energy provided at the position when voltage sag of the power distribution network occurs, excessive reactive power is consumed during voltage swell, and voltage instability degree is relieved. By means of a solid changeover switch, the micro-grid connection and disconnection switching speed and accuracy are improved. Accordingly, multi-micro-source micro-grid can be friendly connected to the power distribution network in a minimum connection mode and meanwhile has the capacity of assisting the power distribution network to ride through a voltage sag fault.

Description

Technical field [0001] The invention relates to a flexible grid-connected control method of microgrid based on integrated control at public connection points, which is a technology based on integrated control of energy storage and solid-state switches at public connection points to enable microgrid to be connected to the grid with minimum access A microgrid control method that is connected to the distribution network and can feed back the distribution network according to the reverse support algorithm is a technology for distributed energy to be flexibly connected to the distribution network in the form of a microgrid. Background technique [0002] Microgrid is an emerging energy transmission mode that increases the penetration rate of renewable energy and distributed energy in the energy supply system. Its composition includes different types of distributed power, energy storage systems, load user terminals, and related measurement and control. , Protection device, as an advance...

AI Technical Summary

Problems solved by technology

[0008] Purpose of the invention: In order to overcome defects such as extended response time, lack of flexibility, and poor portability in the prior art, the present invention provides a flexible grid-connected control method for microgrids based on integrated control at public connection points. Redefine an integrated control device that integrates an energy storage system and a solid-state switch, and flexibly connects distributed energy to the distribution network in the form of a microgrid. It does not depend on EMS and communication, and only uses energy storage and solid-state switching at the PCC. Switch coordination, refined management of the microgrid and the whole process of off-grid operation, so that the microgrid can be connected to the distribution network with the minimum access technology, and the microgrid can also assist the distribution network to overcome voltage sags and swells

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