Research and Engineering Practice of Wide area Protection and Control Systems

Abstract

Wide area protection (WAP) system is a control and protection system based on power grid information through network communication. WAP can determine fault location and clear fault selectively and quickly, then analysis the effect of power system stability after fault components disconnection and take appropriate control measures. WAP consists of master and slave station. With wide area information, WAP can solve the setting and matching difficulty of protective relaying, and can shorter the delay time of back-up protection. WAP also can improve the level of power system security and stability operation, and coordinate protective relaying and stability control. Obtain real-time wide area information reliably and accurately is the key point to build WAP. The reliability of network, synchronization accuracy, and the efficiency of communication protocols are key technologies of WAP. Full use of wide area information to get smarter, more reliable and more adaptable control strategy that coordinated protective relaying and stability control is the core contents of WAP. This paper summarizes the theory and engineering problems countered in the process of WAP research and application, and introduces the solutions or ideas. This paper brings out several urgent problems to be solved in order to promote WAP technology, and gives outlook of key issues in the implementation WAP at smart substation.