输电线路集合保护及其实现

TRANSMISSION LINE AGGREGATE PROTECTION AND ITS IMPLEMENTATION

电力系统和电力市场的发展都要求继电保护尤其是后备保护能更安全地工作。文章提出了集合保护的概念,即在不破坏现有保护独立性的基础上,利用与某保护相关的其它保护和断路器的信息来提高该保护功能和性能的保护方案。研究表明,多智能体技术非常适合于实现集合保护。集合保护能利用各种动作判据实现以下功能:在主保护拒动时加速近后备保护动作;在现有保护失效时直接发控制命令让对应的断路器跳闸以切除故障;断路器失灵时,对于未装设断路器失灵保护的设备能缩短远后备保护的动作时间以及达到类似于断路器失灵保护动作的效果;能区分线路过载与故障,与控制系统一起提前解除过负荷状态。文章还给出了集合保护初步的实现方案。

The developments of both power system and electricity market ask for that the protective relayings, especially back-up protective relayings, can work more securely. The authors present a concept on aggregate protection, i.e., on the basis of keeping the independence of existing protective relayings the presented aggregate protection is such a protection scheme in which other protections' and circuit breakers' information related to a certain protection is used to improve its protective function and performance. Research results show that multi-agent system (MAS) is suitable to implement aggregate protection. In aggregate protection different action criteria are used to implement following functions: accelerating the action of nearby back-up protection to trip out the circuit breaker when miss operation of primary protection occurred; directly sending the control command to make the corresponding circuit breaker tripping out to clear the fault when existing protection became invalid; shortening the action time of remote back-up protection and achieving the effect similar to the action of circuit breaker failure protection for the equipment without circuit breaker failure protection when circuit breaker was in failure; distinguishing transmission line overload from its faults and ahead relieving the overload situation in company with control system. A preliminary scheme to implement aggregate protection is given.