Interactive distance protection simulation for computer relay evaluation and studies.

摘要

Protection systems are critical power system components, and their behavior often determines the response of a power system to certain faults. Thus it is important to study the response of a protection system under various kinds of conditions. A comprehensive evaluation of a protection system can be carried out using sophisticated test equipment such as digital simulators. Although relay testing using digital simulators is the most attractive laboratory method to test individual relays, it still has certain constraints such as the limited number of relays which can be tested simultaneously, extended length of time required to carry out tests, and the need for costly amplifiers and interfacing equipment.; Combined computer simulation of power systems and protective relays, on the other hand, provides a good supplement to the relay performance evaluation. Protection system simulation can be used as a valuable preliminary step for overall relay design performance testing. This approach allows complex, multi-terminal coordinated relaying system simulations.; In this dissertation, a novel relay simulation scheme is presented to allow closed-loop power systems and protective relaying systems interaction simulation. The interaction between power systems and protective relays is accomplished through an "interaction buffer". This approach allows the relay models to be implemented in any high level language or powerful software package. The new relay simulation approach provides an optimized interaction between power systems and protective relays. The simulation can be run in either single-step or multiple-step mode automatically according to the power system simulation stage. Therefore, less simulation time is required. These new features make the relay simulation more flexible and efficient.