Research On Intelligent Electronic Devices In Smart Substation Based On ZYNQ Platform

Intelligent Electronic Devices are installed in the bay level,automaticly completing information collection,relay protection,measurement controlling,status controlling and other functions.Intelligent Electronic Devices are important Devices in the substation,reflecting the substation's automation level.Multi-CPU distributed structure has become the mainstream choice of IEDs design.But there are many problems such as difficulty in development,long development period,high number of plugins and components and high failure rate.To solve these problems,we must start from the architecture of IED.The progress of computer technology and chip manufacturing technology have provided solid technical support for the development of IEDs,we have a new direction to overcome the shortcomings of traditional IEDs.Aiming at function integration and communication dispersion of IEDS,the paper provides a bus differential protection IED solution based on ZYNQ platform.First,the EEC 61850 standard is analyzed and the basic functional framework of the IED is obtained.Further,the ZYNQ platform,which integrates dual ARM processing systems and FPGA programmable logic,is selected for IED design.The specific program:The embedded Linux system and the real-time system are built on the dual ARM processing system.The mmslite software package is transplanted in the embedded Linux system which realizes the MMS service,GOOSE/SV function are realized in the real-time system,and the process layer communication is implemented in the FPGA.This section does not cover specific protection functions.Further,the paper designs a bus differential protection IED.Which realizes the sampling value differential logic and bus differential protection for the modeling,the original use of hardware acceleration technology is to build a differential calculation module in FPGA,and differential calculation module is along with time difference method in real-time system to detection TA saturation.In this part,the principle of TA saturation is analyzed,and the simulation of time difference method shows that the difference method has good detection performance of TA saturation.In this paper,the design of IP core is introduced in detail,and the implementation strategy of differential logic state machine is expounded.Hardware acceleration technology brings data interaction between hardware and software data interaction and protection parallel protection execution strategy,t these two aspects were described in detail.Finally,the paper conducted three tests:1)resource occupancy test:that bus differential protection IED system hardware and software used to meet the system constraints.2)Acceleration ratio test:hardware acceleration technology has achieved about 4.8 times speed ratio,significantly improves the efficiency of the difference method,overcomes the serious situation that difference method can not be achieved in software.3)RTDS system closed-loop test:simulates various types of bus fault and TA saturation to test the bus differential protection IED,the results show that IED has good selectivity,reliability and detection of TA saturation performance.The development of intelligent substation IED on ZYNQ platform has brought about the change of device architecture and development mode.The IED's architecture replaces the original multi-board with a single board,reduces the size of the product,the number of components and plug-ins,the failure rate,and improves stability,reliability.IED design processing uses a standard hardware and software development tools,which improves the development consistency,shortens the development cycle.IED becomes easy to implement and maintenance.Tests show that the bus differential protection IED resources to meet the system constraints,the operating condition to meet the national standards.Therefore,the design result of the paper has practical application value.