研究目的

To address the state-of-the-art challenges of transmission switching (TS) by studying the benefits of corrective switching using authentic Independent System Operator of New England (ISO-NE) data and software, focusing on both N?1 and N?1?1 reliability applications.

研究成果

The study evaluates corrective switching in the context of ISO-NE markets. The corrective actions are considered in the market model so fewer preventative actions are required to maintain reliability. Adaptive corrective switching is shown to improve the market surplus in all 25 of the real-time market cases studied, in most cases reducing the cost of congestion by half or more compared to removing contingency constraints altogether. The long-run benefit is more modest because the ISO-NE system is infrequently congested: the yearly benefit of corrective switching adoption, for N-1 reliability application, falls between $200 thousand and $600 thousand. A larger benefit is expected to come from updating interface limit calculations for N-1-1 reliability. The potential benefit for interface limits may be several million dollars per year due to decreasing local reliability commitments in the DAM.

研究不足

1. Transient stability is maintained as we do not perform stability analysis for corrective switching. Corrective switching after an initial contingency can be seen as an N-1-1 event. 2. The identified switching action can be implemented in a timely manner (within minutes) to limit temporary overloads above thermal limits. 3. The new dispatch in the study periods does not adversely affect other periods.