Variable Spillover Gain Reactive Current Control
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Solution Overview
Problem
Existing two-stage power converters in wind turbine systems face limitations in fully shifting reactive current from the rotor side converter to the line side converter due to the use of static gains, which restricts the spillover of reactive power.
Innovation Solution
A method and system that utilize a variable spillover gain based on the maximum line converter current to determine an adjusted spillover margin, allowing for full spillover of reactive current from the rotor side converter to the line side converter, enabling dynamic control of reactive current output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static gains are used in the control logic, then the control system is simple, but the reactive current spillover to the line converter is incomplete
Solution Approach 1:
The patent applies the dynamics principle by transitioning from static gains to a dynamic spillover gain that varies based on the maximum line converter current. The spillover gain is calculated as the ratio of the actual line converter current capability to its maximum rating, allowing the control system to adaptively optimize reactive current spillover according to real-time operating conditions while maintaining computational simplicity.
2Adaptability or versatility
If the line converter current is limited, then the converter operates safely, but the reactive current spillover is restricted
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the spillover gain based on the line converter's current operating point relative to its maximum rating. When the line converter operates below its maximum current capability, the spillover gain increases to enable greater reactive current transfer. When approaching the current limit, the gain decreases automatically, ensuring safe operation while maximizing reactive power transmission capability at each operating point.
Data Source
AI summary
Systems and methods for controlling reactive current output of a line converter in a power system are provided. In one example embodiment, a method includes receiving a margin signal determined based at least in part on a stator current margin or a rotor current margin. The method includes determining a spillover margin based at least in part on the margin signal. The method includes determining an adjusted spillover margin using a spillover gain. The method includes determining a reactive current command for a line converter based at least in part on the adjusted spillover margin. The method includes controlling the output of the reactive current by the line converter based at least in part on the reactive current command. The spillover gain is variable based at least in part on a maximum line converter current.