Abstract
Correct and fast detection of a micro-grid (MG) islanding is essential to the MG since operation, control, and protection of the MG depend on its operating mode i.e., an interconnected mode or islanding mode. This study describes the design, evaluation and implementation of an islanding detection method for an MG, which includes a natural gas-fired generator, a doubly fed induction generator type wind generator, a photovoltaic generator, and some associated local loads. The proposed method is based on the instantaneous active and reactive powers at the point of common coupling (PCC) of the MG. During the islanding mode, the instantaneous active and reactive powers at the PCC are constants, which depend on the voltage of the PCC and the impedance of the dedicated line. The performance of the proposed method is verified under various scenarios including islanding conditions for the different outputs of the MG, and fault conditions by varying the position, type, inception angle and resistance of the fault, using the PSCAD/EMTDC simulator. This paper also concludes by implementing proposed method into a TMS320C6701 digital signal processor. The results indicate that the proposed method successfully detects islanding for the MG in islanding conditions, and remains stable in fault conditions.
Highlights
Distributed generations (DGs) are small-scale power generations, which are considered to be a promising approach as a solution of economic and environmental issues for conventional power systems [1,2,3]
This paper proposes an islanding detection method for the MG based on the instantaneous active and reactive power delivered from the MG to the dedicated line
It can be concluded that the proposed islanding detection method can remain stable in fault component of the fault current
Summary
Distributed generations (DGs) are small-scale power generations, which are considered to be a promising approach as a solution of economic and environmental issues for conventional power systems [1,2,3]. Even when the connection between the MG and the distribution networks of the grid is broken, the MG can open the circuit breakers at the MG side, and maintain the balance of generation and consumption by regulating the output of DGs or shedding some loads in the MG, which is referred to as islanding operations of the MG [7,8]. The active methods, which are used to maintain a small amount of distortion of the current wave put into the point of common coupling (PCC), regulate the output of the MG and monitor the system response [17,18] The active methods, such as the active frequency drift and the reactive export error detector, can detect the islanding inception of an MG with a small non-detection zone. This paper concludes by implementing the proposed method into a TMS320C6701 digital signal processor (DSP)
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