Controllable Grid Interface
Engineers have developed a cross-cutting approach to evaluating grid integration using the Controllable Grid Interface (CGI) that provides grid operators with the performance information they need for a fraction of the time and cost it would take to validate a turbine in the field.
NREL's 7-megavolt amperes CGI system can reduce certification time and costs while providing system engineers with a better understanding of how wind turbines, photovoltaic inverters, and energy storage systems react to disturbances on the electric power system.
- The first validation facility in the United States that has fault simulation capabilities
- Allows manufacturers and system operators to certify renewable systems in a controlled environment
- Fully integrated with two dynamometers, turbines in the field, and to a matrix of electronic and mechanical storage devices
- Validates wind turbines offline from the grid
- Verifies compliance with standards
- Previously recorded data from various power systems or from data generated by models allows for accurately-produced inertial and primary frequency response controls validation
Learn more about the CGI.
Engineers at the NWTC have the ability to connect the CGI to a number of facilities, including the 5- and 2.5-MW dynamometers, grid integration research pads, individual or multiple MW field-research wind turbines, and the Energy Systems Integration Facility. These connections allow for the following capabilities:
- Balanced and unbalanced over- and undervoltage fault ride-through evaluations
- Frequency response assessments
- Continuous operation under unbalanced voltage conditions
- Grid condition simulation (strong and weak)
- Reactive power, power factor, and voltage control validation
- Protection system assessment (over- and undervoltage and frequency limits)
- Islanding operation
- Subsynchronous resonance conditions
- 50-Hz evaluations.