Features and Improvements
- Auxiliary Files (SCRIPT and DATA Sections): Added a new script command LoadPTISEQData(filename, version); The filename is the file being opened. Version is an integer representing what version of the SEQ file to open.
- Transient Stability: added VPERHZ1 generator relay model that implements a Volts per Hertz definite time relay model. It has 5 zone (V/Hz and Time) settings, a measurement delay for per unit voltage and per unit speed (Note: model uses speed as a proxy for frequency), and a breaker delay.
- Transient Stability: Modified the meaning of the "rrpwr" rate limit on real current for many renewable energy machine models. Previously this rate limit only applied to real current that was increasing in the positive direction. It will now apply to increasing the ABSOLUTE value of real current instead. Thus if the present real current is negative it will be a negative rate limit and if present real current is positive it will be a positive rate limit. This has become necessary as these machine models are being used for energy storage devices which can initialize real current as a negative value to represent charging. This impacts the models GEWTG, WT3G, WT4G, WT3G2, WT4G1, PV1G, REGC_A, REGC_B and REGC_C. The DER_A model had always been coded in this manner.
- Transient Stability: Fixed a bug with the auto insert DISTRELAY feature. The auto insert feature was incorrectly placing the relay at the opposite end of the line from what the user indicated. This has been fixed.