Conversion of PSS®E Models into RSCAD Models: Lessons Learned

The use of real time digital simulation of large power systems is widely spreading due to its high precision result and increasing computing capability. However, in many cases, especially when large power system networks are to be modeled, the interconnection data and parameter data are available in files which are used as input to simulation programs. Most transmission utilities use dynamic studies using PSS (R) E, PSLF or similar type of tools. Since most of the system data are available in PSS (R) E data format, it will be easier to develop an electromagnetic transient model if those data files can be used without putting much effort. Considering the benefit in huge savings in time, RTDS (R) Technologies Inc. has developed a conversion routine to generate transient model of power system network using the data files available in PSS (R) E. This paper discusses the conversion process and uses two test cases to verify the accuracy of the conversion tool. IEEE 39 bus test system and a notional 311 bus system were used for this purpose. Both steady state and transient test results of PSS (R) E and RSCAD model are then compared with each other. This paper also discusses the limitations and challenges of the conversion process, as well as potential solutions. In essence, this study evaluates the accuracy of model conversion from PSS (R) E to RSCAD for large power systems and highlights the lessons learned from the whole exercise.