SCE Inertia Reduction Study

Project: Research project

Project Details


SCE Inertia Reduction Study SCE Inertia Reduction Study Growing environmental concerns and attempts to reduce dependency on fossil fuel energy resources are bringing renewable energy resources to the generation portfolio of electric power utilities. Among the various renewable resources, wind and solar power are assumed to have the most favorable technical and economical prospects. Within the several wind generation technologies, variable speed wind turbines utilizing doubly fed induction generators (DFIGs), and also generators with full converter interface ( IEEE Types 3 and 4 wind generators) are becoming prominent installations. The power electronic converter at the heart of Type 3 and 4 wind generators effectively decouple the inertia of the generators from the system. Hence, with the increased penetration of Type 3 an 4 wind generators, the effective inertia of the system will be reduced and system dynamic performance following a disturbance could be significantly affected. In order to meet its mandated renewable generation goals, Southern California Edison (SCE) is bringing large amounts of wind generation from remote desert areas into the bulk system (500 kV network). Also, it is planned to connect significant amounts of solar PV energy resources in San Bernardino area (eastern territory of SCE service). The increase in the penetration of renewable resources, with effectively low inertia facilities, will cause a change in the system dynamics. Furthermore, for environmental reasons, old and inefficient gas fired generating facilities in the coastal area that are close to LA basin load center are expected to retire, which adds to the reduction of the system inertia. In order to better understand these changes in the system dynamic behavior, adequate studies need to be conducted to assess the possible negative impact and solutions. The problem of reduction in system inertia due to the Type 3 and 4 wind generators has been the subject of a recent study published by PSERC [1]. This scope of work proposes further investigation of the subject and extension of the results to SCE system under the conditions described above. The study will evaluate the SCE system areas described in the PSERC report, namely: Impact of Increased DFIG Penetration on Small-Signal and Transient Stability, Impact of Increased DFIG Penetration on Frequency Response and Stability, and Impact of Increased DFIG Penetration on Voltage Response and Stability. In addition to lack of inertia that the type 3 and 4 wind-turbine generators bring to the system; this scope proposes also to study the impact in the reduction of the SCE system inertia due to the possible retirement of the current coastal synchronous generators. It will also evaluate the possible use of these existing synchronous generators as synchronous condensers to prevent reduction in the system inertia and compromise SCE system security.
Effective start/end date10/15/1012/31/11


  • INDUSTRY: Domestic Company: $164,807.00


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