PLL Regulator Synchronization via Dynamic Gain Scaling
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Solution Overview
Problem
Power generation systems face challenges in quickly regaining synchronization with the grid voltage during grid and system events due to the responsiveness of phase-locked loop (PLL) regulators, leading to undesirable system performance.
Innovation Solution
A method and system that determine a phase angle error and calculate a scaling factor to reduce current commands and dynamically adjust the proportional gain constant within the PLL regulator, allowing for faster synchronization and improved stability during grid events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PLL regulator operates with standard control parameters during grid events, then the system maintains stability, but the time required to regain synchronization with the grid voltage increases
Solution Approach 1:
The patent applies dynamics by making the proportional gain constant dynamic rather than fixed. The controller adjusts the proportional gain constant based on the magnitude of the phase angle error detected during grid events. When significant phase angle errors occur, the controller increases the proportional gain constant to accelerate PLL response and synchronization recovery, while maintaining system stability through adaptive parameter adjustment.
Solution Approach 2:
The patent implements parameter changes by modifying the proportional gain constant in the PLL regulator based on operating conditions. The controller monitors phase angle errors and dynamically adjusts the proportional gain constant to optimize PLL performance during different grid event scenarios, enabling faster synchronization recovery without compromising system reliability.
2Loss of time
If the proportional gain constant is increased to speed up PLL response, then synchronization recovery time decreases, but system stability during normal operation may be compromised
Solution Approach 1:
The patent resolves this contradiction through dynamic adjustment of the proportional gain constant. Rather than using a permanently high gain value, the controller dynamically modulates the proportional gain constant based on real-time phase angle error measurements. This allows the system to achieve fast synchronization recovery during disturbances while maintaining optimal stability characteristics during normal operation.
Solution Approach 2:
The patent employs feedback mechanisms where the controller continuously monitors phase angle errors from the PLL regulator and uses this information to adjust the proportional gain constant. This closed-loop feedback approach ensures that aggressive control actions (high proportional gain) are applied only when necessary during grid events, while normal operating conditions use moderate gain values to maintain system stability.
Data Source
AI summary
In one aspect, a method for controlling a power generation system may generally include determining a phase angle error associated with the power generation system, determining a scaling factor based on the phase angle error, generating a current command for controlling the operation of a power convertor of the power generation system and applying the scaling factor to the current command such that the current command is reduced when the phase angle error exceeds a predetermined error threshold.