Enhanced Model of Wind Parks Protection Regarding Fault Ride Through in Distribution Systems with Telecommunication Overcurrent Relays

Fault ride through (FRT), one of the main requirements of the distribution networks, led some generators to be disconnected from the network after a short time. Such incidents in the distribution network with the high penetration of wind plants cause power failure and reduce reliability. To investigate these problems, the FRT requirements of the wind turbine generator are considered part of the objective function of the relay’s coordination. So, when relays are coordinated using optimal settings, the time duration allowed for fault clearing is also considered. This paper presents a method to accelerate relay operation by establishing a telecommunication connection between the relays to prevent the disconnection of wind turbines from the network. This aim is accomplished by transferring the FRT diagram from the voltage-time plane to the current-time plane of each relay, taking into account faults with different resistances. Then the relay diagram and the transferred FRT diagram are compared, and the relay diagram must be placed under the transferred diagram. The fault condition results illustrate that many relays with the new setting improve the FRT capability. For verification, the proposed method has been implemented on IEEE 8-bus and 30-bus ring networks.