Power System Time Delay Compensation via Phase Shift
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Solution Overview
Problem
Time delays in remote feedback signals destabilize power system control, particularly in electric power transmission networks, due to the length of communication channels and potential stochastic nature of total time delays, which can lead to system instability and potential blackouts.
Innovation Solution
A method and controller that determine and compensate for time delays in remote feedback signals by converting them into phase shifts, calculating compensation angles, constructing Nyquist diagrams, and applying a preferred compensation angle to shift oscillatory modes, utilizing a global clock for continuous synchronization and estimation of time delays, without requiring additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If remote feedback signals are used in power system control, then the control range and system performance are improved, but time delays in communication channels cause system instability
Solution Approach 1:
The patent applies preliminary action by estimating the time delay in the feedback path before it fully impacts system stability. The controller proactively compensates for the anticipated delay by adjusting the phase of control signals based on predicted delay characteristics, rather than waiting for instability to manifest. This advance compensation maintains system stability while preserving the benefits of remote feedback control.
Solution Approach 2:
The patent changes the phase parameter of control signals to compensate for time delays. By dynamically adjusting the phase angle of feedback signals based on estimated delay values, the system transforms the harmful effect of time delay into a manageable parameter adjustment, maintaining stability while using remote feedback for extended control capability.
2Reliability
If transfer limits are imposed on transmission interfaces to handle bottlenecks, then system security is improved, but more costly power production must be connected while less costly production is disconnected
Solution Approach 1:
The patent implements feedback mechanisms that continuously monitor system conditions and adjust control parameters in real-time. By using feedback from remote measurements, the system can dynamically optimize power flow within transfer limits, ensuring system security is maintained while minimizing the impact on power production costs through intelligent, adaptive control decisions.
Solution Approach 2:
The patent applies dynamics by making transfer limits and control parameters adaptive rather than static. The system dynamically adjusts operational parameters based on real-time conditions, allowing it to operate at the boundaries of transfer limits when conditions permit, thereby reducing the need to permanently disconnect cost-effective generation while maintaining security requirements.
3Reliability
If time delay compensation is implemented in power system control, then system stability is improved, but the complexity of control algorithms increases
Solution Approach 1:
The patent applies self-service by implementing adaptive time delay estimation and compensation that automatically adjusts to changing system conditions without requiring manual intervention or complex external calibration. The control algorithm estimates delay parameters and compensates for them autonomously, maintaining stability while keeping the complexity manageable through self-adjusting mechanisms rather than fixed complex compensation schemes.
Data Source
AI summary
A method and controller are provided for the compensation of time delays in remote feedback signals in power system control. The method includes converting the time delay into a phase shift and calculating four compensation angles from the phase shift. The optimal compensation angle is determined and applied to the remote feedback signals. A technique of equipping a controller with a global clock is also disclosed.