HVDC Setpoint Determination for Voltage Stability
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Solution Overview
Problem
Current HVDC control systems are inefficient and slow to respond to voltage instability and unplanned events in power systems, as they rely on manual operator intervention and do not consider the overall power system performance, leading to potential system breakdowns due to fast load dynamics.
Innovation Solution
A method for determining setpoint parameters for an HVDC link in parallel with an AC transmission corridor using equivalent models to quickly calculate and adjust active and reactive power transfer values, allowing for fast response to changing conditions and mitigating voltage instability, involving obtaining measurements, determining power deficits and surpluses, and simulating line trips to optimize setpoint parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If manual operator intervention is used to change setpoints, then operational simplicity is maintained, but response speed to voltage instability and unplanned events is too slow
Solution Approach 1:
The control system automatically determines setpoint parameters by itself without manual operator intervention. The setpoint determiner continuously monitors power system conditions and autonomously calculates optimal setpoints for HVDC links, enabling the system to serve itself in real-time decision-making.
Solution Approach 2:
The system uses real-time measurements from phasor measurement units and power flow data to continuously feedback on system conditions. This feedback loop enables automatic adjustment of setpoints based on current voltage stability and power transfer conditions, eliminating the delay inherent in manual monitoring and adjustment.
2Adaptability or versatility
If setpoints are kept constant or changed manually on a slow time-scale, then control simplicity is maintained, but ability to respond to fast load dynamics and voltage instability is insufficient
Solution Approach 1:
The setpoint parameters are transformed from static, manually-adjusted values into dynamic, continuously-updated parameters. The system calculates setpoints in real-time based on current operating conditions, enabling the HVDC control to adapt rapidly to changing load dynamics and voltage stability requirements.
Solution Approach 2:
The system performs preliminary calculations of optimal setpoints based on anticipated operating conditions and power flow requirements. By proactively determining setpoints before voltage instability occurs, the system can prevent rather than merely react to problems.
3Reliability
If off-line calculation is used for transfer limits, then conservative safety margins are achieved, but network performance and capacity are limited
Solution Approach 1:
The system dynamically changes the transfer limit parameters based on real-time operating conditions rather than using fixed, conservative off-line calculated values. By adjusting setpoint parameters according to actual voltage stability margins and power flow conditions, the system can safely operate at higher capacities when conditions permit.
Solution Approach 2:
The patent replaces the static, mechanical approach of off-line calculation with a dynamic, computational approach using real-time measurements and automated algorithms. This substitution enables the system to continuously optimize transfer limits based on actual system state rather than predetermined conservative margins.
4Ease of operation
If conventional control with constant setpoints is used, then system simplicity is maintained, but voltage stability and overall power system performance are not optimized
Solution Approach 1:
The control system automatically optimizes voltage stability and power transfer performance without requiring operator expertise in complex stability analysis. The setpoint determiner performs the sophisticated calculations and adjustments autonomously, making advanced voltage stability control as easy to operate as constant setpoint control.
Data Source
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AI summary
It is presented a method for determining setpoint parameters for controlling a HVDC link (10) provided in parallel with a transmission corridor (11) comprising at least one AC line (12a, 12b). The comprises the steps of: obtaining a first set of measurements of a first end of the transmission corridor; obtaining a second set of measurements of a second end of the transmission corridor; determining which one of a first area (5a), connected to the first end of the transmission corridor, and a second area (5b), connected to the second end of the transmission corridor, that has a deficit of active power and which one of the first area and the second area of the transmission corridor that has a surplus of active power; determining a model equivalent, based on a corridor equivalent of the transmission corridor and a generator equivalent of the area operating predominately as a generator; and determining setpoint parameters for the HVDC link based on the model equivalent.