Abstract
Soft Open Point (SOP) is a power electronic device installed in place of normally open points in electrical distribution networks. This paper investigates the dynamic performance of a medium voltage (MV) distribution network with a connected SOP, under grid side AC faults. Use of sequence networks was extended to include SOP, such that conventional fault analysis technique can be used on a distribution network with SOP. A Fault-Index was defined using symmetrical components of voltages measured at the grid connection point of the SOP. The network performance was investigated under a line-to-ground, a line-to-line and a three-phase fault. The behaviour of the network was analysed under different control schemes and various operating scenarios of the SOP. Furthermore, the dependence of the sequence voltages and currents on the SOP set points was investigated. Simulations were carried out on an 11kV generic UK distribution network model developed in PSCAD/EMTDC. Results show that the convectional fault analysis technique is applicable on a network with SOP, regardless of the SOP control mode. The Fault-Index, defined based on the local voltage measurements, was effective in detecting the presence of an AC fault in the MV distribution network. In addition, the need for a non-current based detection method is illustrated.
Highlights
In medium voltage (MV) distribution networks, power electronic devices have been increasingly deployed due to their applications in integrating distributed energy resources (DER) [1]
Soft Open Point (SOP) is a power electronic device installed in place of normally open points in electrical distribution networks
This paper investigates the dynamic performance of a medium voltage (MV) distribution network with a connected SOP, under grid side AC faults
Summary
In medium voltage (MV) distribution networks, power electronic devices have been increasingly deployed due to their applications in integrating distributed energy resources (DER) [1]. Applications of power electronic devices such as electronic on-load tap changers, solid state fault current limiters and Soft Open Points (SOPs) are mainly under investigation [2,3]. SOP is a power electronic device installed in place of a normally open or normally closed point in a distribution network [4,5]. Authors of paper [4] proposed a method to determine the optimal installation sites and capacities of SOPs under normal operating conditions. Existing literature mostly describes the behaviour and benefits of SOP under the normal network operation and the post fault scenarios. A method was developed to detect faults in a distribution network with SOP, using sequence voltage measurements at the grid connection point of the SOP. The dependence of the sequence voltages and currents on the SOP set points was investigated
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