I. Introduction
With the advent of renewable energy resources, the trend of using distributed generation (DG) has substantially increased. The conventional distribution networks are gradually moving towards active distribution networks. These systems intrinsically have many uncertainties, including load, generation, and incidence of contingencies [1]–[2]. These uncertainties may introduce risks, thereby, impeding the safe operation of the network. The aim of risk assessment is to evaluate the probable consequence of the unwanted events on a pre-selected system index. This index can be line overload, low voltage, or any other suitable quantity which is affected by the undesirable event. This index is commonly known as a risk index or risk evaluation indicator [3]. In short, risk in a power system is comprised of the possibility and severity of unwanted events. This idea was first suggested by The International Council on Large Electric Systems (CIGRE) [4].