Micro-grid system and seamless grid connection/disconnection switching method for energy storage converters

An energy storage converter and seamless switching technology, applied in the field of microgrid, can solve the problem of not being able to meet the capacity requirements of the microgrid system

Inactive Publication Date: 2015-04-29
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing energy storage converter grid-connected / off-grid seamless switching technology only takes a single energy storage converter as the research object, but with the continuous expansion of the capacity of the micro-grid system, a single energy storage converter can no longer meet the requirements Capacity requirements of the microgrid system

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  • Micro-grid system and seamless grid connection/disconnection switching method for energy storage converters
  • Micro-grid system and seamless grid connection/disconnection switching method for energy storage converters

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] see figure 1 , the embodiment of the present invention discloses a microgrid system to realize seamless switching between grid-connected and off-grid converters on the premise of meeting the capacity requirements of the microgrid system, including: participating in parallel networking A plurality of energy storage converters 10, a controlled switch 20 connected to the microgrid bus and AC bus, and a host controller connected to the controlled switch 20 ...

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Abstract

The invention discloses a micro-grid system and a seamless grid connection / disconnection switching method for energy storage converters. The micro-grid system comprises a plurality of energy storage converters participating in parallel connection networking, a controlled switch for connecting a micro-grid bus with an alternating-current bus, and a host controller in communication connection with the controlled switch and the energy storage converters participating in parallel connection networking. The host controller is used for controlling the energy storage converters participating in parallel connection networking to perform V / F control synchronously and controlling the controlled switch to be disconnected when detecting grid outages or faults, and controlling the energy storage converters participating in parallel connection networking to perform P / Q control synchronously and controlling the controlled switch to be connected when detecting grid power restoration, so that seamless grid connection / disconnection switching of the energy storage converters is achieved on the premise of meeting micro-grid system capacity requirements.

Description

technical field [0001] The invention relates to the technical field of micro-grids, and more specifically, to a method for seamless switching of grid-connected / off-grid systems and energy storage converters. Background technique [0002] The microgrid system is a small power generation and distribution system that integrates distributed generator sets, load and energy management systems. Energy storage converters are usually added to the microgrid system. When the power grid is powered off or faulty, the energy storage converters are switched from P / Q control (active / reactive power control) to V / F control (voltage / frequency control) ), to carry out off-grid independent inverter operation; after the grid receives power, the energy storage converter is switched from V / F control to P / Q control, and performs grid-connected charging and discharging operation. Since the energy storage converter can operate both grid-connected and off-grid, it is hoped that it can seamlessly switc...

Claims

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Application Information

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IPC IPC(8): H02J3/32
CPCH02J3/32Y02E70/30Y02P80/14
Inventor 曹伟余勇张长信朱信捷刘洋孙德亮
Owner SUNGROW POWER SUPPLY CO LTD
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