Expansion Area Of ​​law And Its Application In Power System Analysis Software Application Development

With the expansion of electrical power system, transient stability assessment (ISA) is becoming more and more important. Transient simulation based on step-by-step (SBS) integration cannot meet the requirement of quantitative stability information. Though, the direct transient stability methods based on transient energy functions (TEF) can provide quantitative measures of stability such as stability margin and critical clear time, the poor precision caused by the approximation of transient energy functions is fatal.The extended equal area criterion (EEAC) method for power system stability developed from static EEAC (SEEAC) method, via dynamical EEAC (DEEAC) method, to integrated EEAC (IEEAC) method which integrates EEAC with transient simulation based on SBS method. IEEAC method combines the advantages of both EEAC method and SBS method. On the one hand, this method inherited EEAC's fast merit and has the ability to provide quantitative measures. On the other hand, SBS ensures EEAC method's precision, and provides the modeling capabilities of conventional time domain simulation. Therefore, EEAC method is becoming the dominant method for transient quantitative assessment gradually.Power system analysis software package (PSASP) has a good module for transient simulation in time domain. Based on this module, a program for transient quantitative assessment using EEAC method was accomplished. Stability margin, critical clear time, generator boundary active power and boundary load can be obtained using this program. Also SEEAC was added into PSASP for fast scanning of transient stability.This method has been applied to WEPRI-36 power system and the realistic 89-generator 413-bus Shandong (China) power system. The results show that the method meets the requirement of quantitative transient assessment in the projects.