Which condition contributes favorably to the calculation of CPS1?

CPS1, or Control Performance Standard 1, is a metric used to evaluate an area's control performance in maintaining system frequency. It is heavily influenced by the Actual Control Error (ACE), which balances generation and load within a power system. In essence, a lower ACE indicates better performance.

When considering high frequency conditions, a negative ACE implies that the system is over-supplied with generation, which effectively means that the system is doing well in terms of maintaining the balance between supply and demand. Therefore, this situation reflects positively in the calculation of CPS1. A negative ACE, especially under conditions of high frequency, signifies that the system has sufficient resources to manage its load effectively, contributing to performance that is above compliance requirements.

The other choices highlight conditions that either do not assist in maintaining adequacy in generation or are neutral. Positive ACE when frequency is high suggests an undersupply situation, worsening system control performance. Neutral ACE values indicate stability but do not reflect improvements or efficiencies in the balancing process. Positive ACE at low frequency suggests that generation cannot keep up with the load, resulting in poor performance assessment under CPS1 metrics.