Abstract
This paper proposes a new smart under frequency load shedding (UFLS) scheme, based on Takagi-Sugeno (TS) fuzzy inference system and flexible load priority. The proposed scheme consists of two parts. First part consists of fuzzy load shed amount estimation module (FLSAEM) which uses TS-fuzzy to estimate the amount of load shed and sends its value to accurate load shedding module (ALSM) to perform accurate load shedding using flexible load priority. The performance of the proposed scheme is tested for intentional islanding case and increment of sudden load in the system. Moreover, the response of the proposed scheme is compared with adaptive UFLS scheme to highlight its advantages. The simulation results show that the proposed UFLS scheme provides the accurate load shedding due to advantage of flexible priority whereas adaptive UFLS scheme due to fixed load priority does not succeed to achieve accurate load shedding.
Highlights
The global apprehension on environmental security and deregulation in the power industry has make it inevitable to utilize the DG resources for the production of electrical energy [1]
This research has proposed a new smart under frequency load shedding (UFLS) scheme to enable successfully the intentional islanding operation of distribution system connected with distributed generation
The proposed UFLS scheme was mainly consisted of fuzzy load shed amount estimation module (FLSAEM) and accurate load shedding module (ALSM)
Summary
The global apprehension on environmental security and deregulation in the power industry has make it inevitable to utilize the DG resources for the production of electrical energy [1]. In case of islanding event, these DGs are disconnected from the grid to avoid any severe consequences. Islanding condition is a phenomenon in which distribution system is isolated from grid due to severe fault; yet continue to be supplied from the distributed generation unit connected to distribution system [2]-[4]. Due to the aforementioned severe consequences of islanding, it is recommended by the IEEE Std 1547 [5], and IEEE Std 929 [6] to disconnect the DG within 2 seconds from the distribution network. If DG is isolated from the distribution network its full capacity will not be utilized
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