A Doubly-Fed Induction Generator Adaptive Control Strategy and Coordination Technology Compatible with Feeder Automation

Abstract

The extensive connection of distributed generation (DG) with the distribution network (DN) is one of the core features of a smart grid, but in case of a large number, it may result in problems concerning the DN-DG compatibility during fault isolation and service restoration, for which no efficient and economic solutions have been developed. This paper proposes a doubly-fed induction generator (DFIG) adaptive control strategy (ACS) and a coordination technology to be compatible with the typical feeder automation (FA) protection logics in the ring distribution system. First of all, an ACS simulating the inertia/damping characteristics and excitation principles of synchronous generators is developed to achieve seamless switching between DFIG grid-connection/island modes, and make distant synchronization possible. Next, a technology coordinating the DFIG islands controlled by ACS and the remote tie-switches based on local inspection of synchronization conditions for closing is developed to achieve the safety grid-connection of DFIG islands in the absence of DN-DG communication. At the last, a detailed simulation scenario with a ring DN accessed by five DFIGs is used to validate the effectiveness of ACS and coordination technology compatible with FA in various faults scenes.

Doubly-Fed Induction Generator Coordination Control Strategy Compatible with Feeder Automation

“…Electronics 2020, 9, 18 3 of 18 technical route and final goals of smart grid will surely and gradually break through those restrictions to achieve the smart integration of DG and DN [24,27]. In the past decades, the doubly-fed induction generator (DFIG) was at a leading position in the market.…”

“…It should be noted that in case of a fault, the current active DN is conservative in two points in the DN-DG coordination: (1) the DN-side control is mainly to temporarily eliminate the "DG", a protection strategy under the traditional DN concept; (2) the DG-side control focuses on the DG and for the purpose of "self-protection" without consideration to the installation environment, and in a deficiency of ideas on technology docking and integration. The current standards and operation guides on the DG integrating into the DN are based on the existing technology level, while the technical route and final goals of smart grid will surely and gradually break through those restrictions to achieve the smart integration of DG and DN [24,27]. In the past decades, the doubly-fed induction generator (DFIG) was at a leading position in the market.…”

Optimal Control of a Doubly Fed Induction Generator of a Wind Turbine in Island Grid Operation

“…[4] and their cooperation during a failure was presented in ref. [10]. An adaptive control strategy was described in the application in a DFIG generator.…”

Improved PR Control Strategy for an LCL Three-Phase Grid-Connected Inverter Based on Active Damping

“…Theoretically, the PR controller has infinite gain at the specific frequency, but the PR controller has poor adaptability to grid frequency fluctuations, so quasi-proportional resonant controllers are widely used [31,32]. The QPR controller has strong adaptability to grid frequency fluctuations, but the gain at the fundamental frequency is limited, so it can only approximately realize error-free tracking [33,34]. In addition, there are hysteresis control, repetitive control, and H ∞ control, but their control performance is not significantly better than that of PI, PR, and QPR controllers [28].…”