Sector Name:Power Delivery & Utilization - Transmission
Document Type:Technical Results
This Product is publicly available
The influx of variable generation technologies, particularly wind generation, into the bulk transmission grid in the U.S. and internationally has been significant over the past decade. This trend will most likely continue in light of national (in other countries) and state renewable portfolio standards. Thus, there is at present a need for generic, standard and publicly available models for variable generation technologies for the purpose of power system planning studies. EPRI has been a key participant and contributor in several industry wide efforts aiming to fulfill this need. These groups include the Western Electricity Coordinating Council (WECC) Renewable Energy Modeling Task Force, the North American Electric Reliability Corporation (NERC) Integration of Variable Generation Task Force, the IEEE Dynamic Performance of Wind Generation Working Group and the International Electrotechnical Commission TC 88 WG27, a working group on wind generation model development.
In collaboration with these groups EPRI has been contributing to the industry wide effort for the development of public and generic models of the steady-state and dynamic performance of variable generation technologies for power system analysis.
EPRI's participation and active engagement in these broader industry efforts to help develop and validate planning models for variable generation technologies is critical to ensuring that the end results of the research are well vetted and so that the models that are developed are accepted industry-wide and are incorporated into the major commercial power system simulation programs. In this way, the value to the EPRI members from this research is maximized while the models bring value to the industry and public at large.
One of the challenges hitherto, with advancing the generic wind turbine generator models, has been model validation and access to measured turbine data. A key contribution of EPRI to the industry efforts to obtain validated models has been that since it is a non-profit and independent research organization, we have been able to put into place none-disclosure agreements with several of the key turbine manufacturers and thus get access to such data and be able to test the models for validity in emulating the time-domain stability behavior of the actual equipment across a range of different vendors. Also, through this process we have been able to suggest some changes to the model structures to make them more generic and thus able to emulate behavior across a wider range of possible designs. It is extremely important to emphasize that the models discussed here are for the purpose of large interconnected power system stability simulations. The models are relatively simple, are intended to capture basic stability type phenomena and do not represent any actual equipment design. In this respect, this is no different than standard models used for a wide range of other power equipment in commercial stability simulation software.
This report documents three things associated with this research effort:
1. A summary of the ongoing efforts to develop generic and publicly available models for variable generation.
2. The results of EPRI's efforts to perform model validation using the concept of measured field data for model validation.
3. To concisely document the future work needed to continually improve the models and model validation procedures.
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