ABSTRACT

Islanding condition means the case of feeding the loads from any distributed generator (DG) with a complete disconnection of the utility grid at the point of common coupling. The main technical issue in DG integration with the primary grid is the islanding condition. Hence, islanding must be detected using an appropriate anti-islanding technique which is needed to be faster in terms of time detection and accuracy. This paper illustrates the phenomenon of islanding and the passive methods which are used for preventing it. The main contribution of this paper is to detect this phenomenon as fast and accurately as possible using the technique of rate of change of power (ROCOP) based on the terminal voltage (TV) (ROCOP-TV) of the Photovoltaic (PV) inverter. The results of the proposed technique have been studied through extensive simulations using the MATLAB/Simulink platform. The ROCOP-TV technique results are compared with various types of passive detection relays after synchronization between the grid side and PV side. Furthermore, the proposed technique was not only able to detect islanding at the instance of its occurrence but also can distinguish between islanding and regular grid faults. The simulation results illustrate the proposed scheme’s effectiveness and flexibility based on the MATLAB/Simulink platform.

摘要

孤岛状态是指在共用耦合点完全断开电网的情况下，从任何分布式发电机（DG）馈入负载的情况。DG与主电网集成的主要技术问题是孤岛状态。因此，必须使用适当的防孤岛技术来检测孤岛，该技术需要在时间检测和准确性方面更快。本文阐述了孤岛现象以及用于防止孤岛现象的被动方法。本文的主要贡献是使用基于光伏（PV）逆变器的端电压（TV）（ROCOP-TV）的功率变化率（ROCOP）技术尽可能快，准确地检测到这种现象。使用MATLAB / Simulink平台通过广泛的仿真研究了所提出技术的结果。在电网侧和光伏侧之间同步之后，将ROCOP-TV技术的结果与各种类型的无源检测继电器进行比较。此外，所提出的技术不仅能够在发生孤岛的情况下对其进行检测，而且能够区分孤岛和常规电网故障。仿真结果说明了该方案在MATLAB / Simulink平台上的有效性和灵活性。所提出的技术不仅能够在发生孤岛时对其进行检测，而且能够区分孤岛和规则的网格断层。仿真结果说明了该方案在MATLAB / Simulink平台上的有效性和灵活性。所提出的技术不仅能够在发生孤岛时对其进行检测，而且能够区分孤岛和规则的网格断层。仿真结果说明了该方案在MATLAB / Simulink平台上的有效性和灵活性。