Improvement of CPS in High-Proportion New-Energy Power System and Practical Application

With the integration of high-penetration new energy, the increasing disparities in power source structures across interconnected power system control areas have become prominent. In some control areas, the growing share of new energy and reduced conventional generation units lead to higher frequency regulation demands but diminished control capabilities. The traditional control performance standard (CPS) under tie-line power and frequency bias control (TBC) mode defines evaluation thresholds using frequency deviation coefficients, but fails to account for the impact of the actual power source structures in different control areas. This inadequacy becomes increasingly evident in the new-energy-dominated power systems. This study first analyzes the assumptions and principles of existing CPS, revealing its limitations in high-proportion new-energy systems. Subsequently, the concept of inherent area control error (ACE) standard deviation is proposed to determine evaluation thresholds, forming an improved CPS methodology. Finally, the case studies show that the refined approach ensures greater fairness and rationality compared with the original CPS.