Invention Reference Number
This invention presents a method for accurately measuring grid voltage and current to enhance grid protection and control (P&C) systems. In power grids rich in converter interfaced resources (CIRs), parameters fluctuate, particularly during faults. The proposed method uses a moving horizon estimation (MHE) technique to estimate grid line parameters and voltages. By utilizing a black-box model to represent CIR dynamics and easily accessible measurements of output current and voltage at the point of common coupling, the method effectively estimates grid impedance and voltage under both normal and faulty conditions, improving P&C system performance.
Description
This invention offers a solution to the critical need for accurate measurements of grid voltage and current, which are essential for the optimal functioning of grid protection and control (P&C) systems. Given the dynamic nature of grid parameters, especially in power networks rich in converter interfaced resources (CIRs), the proposed method accurately estimates grid impedance and voltage. The approach uses outputs from a black-box model of CIRs and voltage measurements at the point of common coupling to support the P&C systems during normal operation and faults. By providing reliable estimations, this invention aims to prevent maloperations of P&C systems, ensuring improved grid stability and safety.
Benefits
- Noise reduction: The MHE algorithm effectively mitigates challenges from noisy measurements, providing reliable data for system operation.
- Accurate estimations: It precisely estimates grid impedance, voltage, and current, enhancing decision-making in P&C systems.
- Fast dynamic response: The method preserves rapid dynamic measurements during faults, ensuring timely responses from P&C systems.
- Improved fault management: Accurate estimations enable informed actions during pre-, post-, and fault conditions, enhancing the security of CIR-rich power grids.
- Cost function minimization: The observer minimizes a cost function while respecting constraints, extracting accurate states and parameters efficiently.
- Online estimation capability: Supports real-time estimations, critical for maintaining stability and effective control in dynamic power networks.
- Enhanced security: Improved accuracy and responsiveness contribute to a more secure and reliable operation of power systems.
Applications/ Industries
- Microgrid control
- Grid-connected converters
- Renewable energy sources
- Transmission systems etc.
Contact
To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.
