Abstract
To solve the problem of incompatibility and mutual repulsion between a distribution network (DN) and distributed generation (DG), this paper first analyzes the conflicts between current feeder automation (FA) and doubly-fed induction generation (DFIG). Then, a DFIG coordination control strategy compatible with FA is proposed to cause the DFIG operating continuously during fault isolation and power supply recovery. The strategy consists of three aspects: (1) a DFIG islanding active synchronization control technology to support islanding and distant presynchronization control; (2) DFIG senses the status of circuit breakers/tie-switch through generic object oriented substation event (GOOSE) messages to achieve rapid switch of control modes and distant synchronization; (3) tie-switch senses the status of DFIG through GOOSE messages for closing. Finally, the effectiveness of the strategy is validated by multiple sound and detailed time-domain simulation cases. This study indicates future possible development trends and provides a simple and effective strategy for researches in the field of smart grid DN–DG compatibility.
Highlights
Distributed generation (DG) is characterized by flexible installation, convenient power supply, and environmental protection
Whether ∆ f is larger or smaller, positive or negative, whether Pe changes significantly or insignificantly, the time required from the whole process of grid-connection to islanding and islanding to grid-connection is within tens of seconds, indicating that the distribution network (DN)–doubly-fed induction generation (DFIG) coordination strategy proposed in this paper can reduce the DFIG islanding to a short process, which makes it fundamentally different from the traditional long-term islanding
Under the support of generic object oriented substation event (GOOSE) communication technology, a DFIG coordination control strategy compatible with feeder automation (FA) is proposed in this paper, and simulated in details under various scenarios
Summary
Distributed generation (DG) is characterized by flexible installation, convenient power supply, and environmental protection. Some improved protection strategies based on relay protection technology, adaptive protection, the optimization of protection settings, and modification of the fault current level has been proposed successively [6,12], trying to accurately detect, locate, and isolate the faults when the DG is grid-connected or islanded, but there are shortcomings and limitations These strategies are to solve the problem of coordination between the protection devices, the dynamic changes in the operation modes between the distribution system and DG are not considered, and a DN–DG coordination mechanism is not provided, so it is likely to lead to islanding instability, islanding’s failure to be incorporated into the DN, or even destruction of the existing distribution system and DG.
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