Synchronization method for parallel-connection operation control of multiple energy storing devices of microgrid

Abstract

The invention discloses a synchronization method for parallel-connection operation control of multiple energy storing devices of a microgrid. The method includes a control policy for microgrid transference from connected network to isolated network, a control policy for microgrid transference from isolated network to connected network and a microgrid isolated-network operation control policy so that a problem of asynchronization of the multiple energy storing devices in transference from connected network to off-network and from off-network to connected network, a ring current problem brought up because differences of the energy storing devices in voltage amplitude and phase angle in operation of the microgrid isolated network and a current balance problem of the energy storing devices in the operation of the microgrid isolated network to be solved effectively so that stability of the microgrid isolated network in operation is improved. In the synchronization method, energy-storing system control is effectively simplified in the operation of the microgrid isolated network through transference of closed-loop points so that the control policies have great universality, practicality and application prospect.

Description

technical field [0001] The invention belongs to the field of power systems, and more specifically relates to a micro-grid control technology including distributed power sources, which is applicable to the parallel operation control technology of multiple energy storage devices. Background technique [0002] With the development of distributed energy generation technology, microgrid has been proposed as an organizational form that can make full use of the potential of distributed energy. A microgrid is a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices. The microgrid constitutes a controllable unit, which can realize self-control, protection and energy management, and can effectively coordinate the relationship between distributed power sources and large power grids, and realize the rapid development of power grids. [0003] The microgrid i...

AI Technical Summary

Problems solved by technology

However, how to coordinate multiple sets of energy storage devices to operate off-grid at the same time (synchronous operation) is still a bottleneck of energy storage technology

When the microgrid is running in isolation, if multiple sets of energy storage devices cannot operate synchronously, it will affect the stability of the microgrid operation, and seriously cause the microgrid to collapse.

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