| 引用本文: | 苏永智,潘贞存,刘志清,王浩.基于WMAN的馈线快速保护实时性研究[J].电力自动化设备,2008,(10): |
| .Real-time performance of fast feeder protection based on WMAN[J].Electric Power Automation Equipment,2008,(10): |
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| 摘要: |
| 利用纵联保护原理可以很好地解决馈线间多开关的保护定值配合问题,实用的关键是保护通信的成本.馈线快速保护对通信的实时性要求相对较低,因此可以考虑采用低成本但实时性较差的无线通信技术.提出一种宽带无线城域网(WMAN)技术的实现方案,重点对该通信方案的延时进行了分析.研究表明,通过完善网络协议,可以满足馈线快速保护的实时性要求.该方案通信的延时主要是无线网络物理层和媒体访问控制(MAC)层延时.其中,物理层延时比较确定,选择合适的标准帧长就可以满足要求:MAC层延时具有很大的不确定性,主要是带宽申请和服务调度的延时,但如果建立专门的带宽申请时隙,并将保护信息作为最高优先级服务,其延时也可以控制在较短时间.仿真计算结果证明该方案总延时在100 ms之内. |
| 关键词: 无线城域网 馈线 保护 延时 |
| DOI： |
| 分类号:TM773 |
| 基金项目: |
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| Real-time performance of fast feeder protection based on WMAN |
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SU Yongzhi PAN Zhencun LIU Zhiqing WANG Hao
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| Abstract: |
| Protective settings of multi -switch feeder can be well coordinated using pilot protection principle and the key of its application is the cost of protection communication. As the requirement of fast feeder protection for real - time performance is low,the wireless communication technology with lower cost is considered. A communication scheme with WMAN (Wireless Metropolitan Area Networks) is proposed and its time-delay is analyzed in detail. Analysis shows its real-time performance,with improved WMAN networks protocol,meets the requirement of fast feeder protection. The time-delay mainly lies in the physical layer and MAC layer of WMAN. The delay in physical layer is nearly fixed and can be easily controlled by selecting a standard short frame. The delay in MAC layer is uncertain because of data link setup and data service dispatch. This can be solved by setting aside a special timeslot for protection connection to apply bandwidth and by awarding top priority to protection data service flow. Simulation shows that the whole time - delay is within 100 ms. |
| Key words: wireless metropolitan area networks,feeder,protection,delay |
