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Substation Automation and Control
Published in Ramesh Bansal, Power System Protection in Smart Grid Environment, 2019
Adeyemi Charles Adewole, Raynitchka Tzoneva
The parallel redundancy protocol (PRP) is a redundancy protocol designed to provide Ethernet network availability for a single point of failure using static redundancy. The operating principle of the PRP is based on the use of dual independent parallel (redundant) networks (LAN A and LAN B) in which Ethernet frames are duplicated and sent simultaneously over two separate networks. The IEC 62439-3 Clause 4 [18] defines the specifications for the PRP, and mostly finds application in star-topology networks in the substation environment.
Substation Integration and Automation
Published in John D. McDonald, Electric Power Substations Engineering, 2017
Like HSR, PRP is described in the IEC 62439 standard. It also offers a very high level of redundancy. However, unlike HSR, PRP does not eliminate the need for switches. Instead, PRP solves the redundancy puzzle by creating a second parallel network of switches. When a device sends a message, it sends out a packet on both networks. The switched network transfers the message to the designated receiving device and the destination device then accepts the first packet to arrive and discards the duplicate on arrival.
Reliability Evaluation of IEC 61850 Process Bus Architecture for Protection Function
Published in Electric Power Components and Systems, 2018
The process bus is the communication network between bay level and process level in the IEC 61850 based digital substation [1]. The bay level devices such as protection and control devices or intelligent electronic devices (IEDs) require the digital interface of process level to communicate with the primary devices in switchyard [2]. According to IEC 61850-5, process bus network redundancy needs to be approached not on a basis of failover times at all but on the basis of a seamless redundancy concept with no failover time at all [3]. Since conventional redundancy protocols cannot guarantee a zero or near-zero frame loss upon network failure occurrence, the high availability redundancy protocols such as parallel redundancy protocol (PRP) and high availability seamless ring (HSR) specified in IEC 62439 [4] have been recommended in the second edition of IEC 61850-9-2 part to enhance the reliability of process bus. However, the process-bus-based protection system usually comprises more electronic devices than the conventional one, which may have a dramatic impact on system reliability [5]. Therefore, it is still important to perform the reliability evaluation of process-bus-based protection system quantitatively [6].