1. CIGRE WG C4.503 – Numerical techniques for the computation of power systems, from steady- state to switching transients WG Composition:  Jean Mahseredjian (Convener), Polytechnique, Montreal  Secretary Bhupesh Gajera, ABB, UK  Total of 28 members 16 countries: Australia, Brazil, Canada, Denmark, France, Ireland, Japan, Mexico, Netherlands, Portugal, Spain, South Korea, Sweden, Switzerland, UK, US WG Timeline:  Start Date: May 2011  Expected Date for Submitting Final Report to SC Chairman: May 2016

2. CIGRE WG C4.503 – Numerical techniques for the computation of power systems, from steady- state to switching transients Highlights of Recent Activity:  Brief list of most recent meetings/activities (e.g. WG presentations at conferences and symposia) The last official meeting was held in Paris during CIGRE 2014 We have established several important benchmarks (Very large effort) – For traditional power system analysis: IEEE39 and new large realistic grid – All generator controls for IEEE39 have been upgraded – For wind integration: small system, large systems, combination of Type III and Type IV wind generators – For GMD studies – For PMU with EMTP – For a distribution system (IEEE390) The progress and coordination with members has been much slower. The problem is not simple and requires meticulous verification and maintenance of test cases. The test cases are complex. Using various software packages is complicated for the verification of results. Organizations are promising to deliver work, but it often takes too much time. I will now change the approach and simply prepare the report and circulate for comments.

3. Future Activity:  A meeting should be planned in November 2015  Start to finalize the descriptions of benchmarks and report Other Items:  The task of this group is complex and requires time to complete. I am trying to increase the contributions of members and availability. The task is important and I will work hard to complete. CIGRE WG C4.503 – Numerical techniques for the computation of power systems, from steady- state to switching transients