Solar Power Converter Dynamic Voltage Threshold Control
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Solution Overview
Problem
Conventional power converters in solar power systems are limited by a fixed minimum direct-current voltage threshold, leading to wasted generated power when the solar battery's output is below this threshold, as they only operate when the direct-current voltage exceeds this marginally tolerable value, resulting in inefficient use of solar-generated power.
Innovation Solution
An operation control apparatus that includes a voltage detector, a switch-on determination device, a criterion calculator, and an operation determination device to dynamically adjust the operation range of the power converter based on alternating-current power system voltages, allowing the power converter to operate when the direct-current output voltage of the solar battery exceeds a calculated criterion, thereby extending its operational range and utilizing generated power more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed minimum direct-current voltage threshold is used for power converter operation, then the power converter can operate reliably under worst-case conditions, but generated power is wasted when the solar battery output is below this threshold
Solution Approach 1:
The patent applies dynamics by making the minimum operation criterion of the power converter variable rather than fixed. The criterion calculation unit dynamically calculates the minimum operation criterion based on real-time alternating-current voltage values from the voltage detector. This allows the power converter to adapt its operation threshold according to actual system conditions, enabling operation at lower direct-current voltages when the alternating-current voltage is favorable, thereby reducing energy waste while maintaining reliable operation.
Solution Approach 2:
The patent changes the parameter of the minimum operation voltage criterion from a fixed value to a dynamically calculated value. By using the criterion calculation unit to compute the minimum operation criterion based on detected alternating-current voltage, the system transforms the operation threshold into a flexible parameter that adjusts according to system state, allowing the power converter to operate efficiently across a wider range of solar battery output conditions.
2Reliability
If the minimum direct-current voltage criterion is fixed at the worst-case value, then the power converter operates safely, but the operation range is limited and startup time increases
Solution Approach 1:
The system dynamically adjusts the minimum operation criterion based on real-time alternating-current voltage detection. This dynamic adjustment allows the power converter to expand its operation range by operating at lower direct-current voltages when conditions permit, thereby reducing startup time and improving power generation efficiency while maintaining safe operation through continuous monitoring and adaptive threshold adjustment.
Solution Approach 2:
The patent implements feedback by using the voltage detector to continuously monitor alternating-current voltage and feed this information to the criterion calculation unit. This feedback loop enables the system to adjust the minimum operation criterion in real-time, allowing the power converter to optimize its operation range and startup characteristics while ensuring safe operation through continuous system state awareness.
3Device complexity
If a fixed minimum voltage criterion is used, then the control system is simple, but the operation range of the power converter cannot be extended
Solution Approach 1:
The patent introduces dynamics into the control system by implementing a criterion calculation unit that dynamically computes the minimum operation criterion based on detected alternating-current voltage. This dynamic approach extends the power converter's operation range to accommodate varying solar battery output conditions while adding only moderate complexity through the integration of voltage detection and calculation functions.
Solution Approach 2:
The voltage detector serves multiple functions: it detects alternating-current voltage for criterion calculation, monitors system conditions for safe operation, and enables adaptive control. This multi-functionality allows the system to extend the power converter's operation range without proportionally increasing overall system complexity, as the same detection infrastructure supports multiple control objectives.
Data Source
AI summary
An operation control apparatus includes a criterion calculator that obtains an operation criterion for the power converter, based on the voltage detected by the above voltage detector on the side of the alternating-current power system, a direct-current voltage detector that detects a direct-current output voltage of the solar battery, and an operation determination device that compares the direct-current output voltage detected by the direct-current voltage detector with the operation criterion obtained by the criterion calculator, and supplies the power converter with an operation command if the direct-current output voltage is greater than the operation criterion.