Power Converter Vector Scaling for Overload Management
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Solution Overview
Problem
Conventional power converter systems face challenges in maintaining terminal voltage within the DC bus voltage limit while ensuring maximal power and power factor control, especially during overload conditions, which compromises the ability to regulate AC currents and power factor.
Innovation Solution
A converter control system comprising a current magnitude determination module, power factor correction module, and power factor adjustment module generates a switching vector to adjust the power factor and manage overload conditions, ensuring the voltage magnitude remains below the DC bus voltage limit by scaling the switching vector and adjusting the angle to maximize power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the switching vector voltage magnitude is increased to provide maximal power output, then the power output is improved, but the terminal voltage exceeds the DC bus voltage limit causing regulation failure
Solution Approach 1:
The patent applies dynamics by making the switching vector angle adjustable and adaptive. The control system dynamically adjusts the switching vector angle based on the terminal voltage and DC bus voltage relationship, allowing the system to operate at maximum power when conditions permit and automatically adjust when voltage limits are approached, resolving the contradiction between maximal power output and voltage regulation reliability
Solution Approach 2:
The patent changes the parameter of switching vector angle to resolve the contradiction. By adjusting this angle parameter, the system can control the terminal voltage magnitude relative to the DC bus voltage limit while maintaining maximal power output capability, enabling the system to operate at the boundary of voltage limits without exceeding them
2Reliability
If the switching vector is scaled down to maintain terminal voltage within the DC bus voltage limit, then the voltage regulation is improved, but the power output is reduced
Solution Approach 1:
The system dynamically adjusts the switching vector angle based on real-time voltage conditions. When terminal voltage approaches the DC bus voltage limit, the angle is adjusted to scale the voltage appropriately, and when headroom exists, the angle allows for maximal power output, thus resolving the contradiction between voltage regulation and power output
3Power
If the output current is increased to meet larger DC load demands, then the power output is improved, but the terminal voltage may exceed the DC bus voltage limit
Solution Approach 1:
The patent employs feedback by continuously monitoring the terminal voltage and comparing it to the DC bus voltage limit. Based on this feedback, the control system adjusts the switching vector angle to ensure that power output increases with load demand while terminal voltage remains within acceptable limits, resolving the contradiction between meeting load demands and maintaining voltage compliance
Data Source
AI summary
A power converter control system and method is provided to maximize the power output of the converter where an overload condition is present. A controller calculates a command voltage and command power factor. The command voltage and command power factor are used to generate a switching vector. Where the voltage associated with a switching vector exceeds an output voltage limit of the converter, a power factor adjustment is generated.