Solar pump system and method for controlling solar pump system
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Solution Overview
Problem
Conventional solar pump systems require additional sensors for accurate voltage and current detection, increasing costs and potentially deteriorating control properties, especially under rapid changes in solar radiation.
Innovation Solution
A solar pump system that uses a controller to maintain a constant DC link voltage by adjusting the output frequency of AC power based on comparisons with reference levels, eliminating the need for additional sensors and stabilizing the water pump operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors are used for accurate voltage and current detection, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The inverter utilizes its own internal operational parameters (DC link voltage, output current, switching frequency) to calculate and detect the solar module's voltage and current without requiring external sensors. The controller performs self-measurement by leveraging existing system data, eliminating the need for additional detection devices while maintaining accurate measurement capability
Solution Approach 2:
The patent introduces a calculation-based intermediary approach where the inverter's controller computes solar module parameters through mathematical relationships using readily available internal measurements. This intermediary calculation method replaces direct physical sensing with indirect computational detection, reducing hardware requirements while preserving measurement accuracy
2Use of energy by moving object
If MPPT control is implemented to track maximum power, then energy generation is improved, but control complexity increases under rapid solar radiation changes
Solution Approach 1:
The system implements continuous feedback control where the controller monitors DC link voltage and output current in real-time, compares actual power extraction with maximum power point references, and dynamically adjusts the inverter's operating parameters. This closed-loop feedback mechanism enables accurate MPPT tracking while adapting to rapid solar radiation changes through iterative correction
Solution Approach 2:
The control system dynamically adjusts the inverter's switching frequency and duty cycle based on real-time solar radiation conditions and load requirements. By making the control parameters adaptive and time-varying rather than fixed, the system maintains optimal power extraction efficiency across changing environmental conditions without requiring overly complex predetermined control algorithms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient energy use and prevents frequent stoppages or changes in the water pump's operation state, maximizing energy generation while avoiding low voltage and high voltage issues, thus reducing energy loss and extending the system's operational lifespan.
Implementation Method 1
a solar module configured to generate DC power from sunlight
Data Source
AI summary
A solar pump system comprises a solar module configured to generate DC power from sunlight, a water pump, an inverter configured to convert the DC power into AC power in order to drive the water pump, and a controller configured to generate a control signal for controlling an output frequency of the AC power. The controller compares the DC link voltage with a first reference level, adjusts the output frequency of the AC power, if the DC link voltage is greater than the first reference level, and determines the output frequency to prevent the DC link voltage from being equal to or less than a second reference level, if the DC link voltage is less than the first reference level.