Method and apparatus for controlling a photovoltaic air conditioning system
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Solution Overview
Problem
Conventional photovoltaic air conditioners are not adaptable to different national grid frequencies, leading to unstable operation and control deviations when used in environments with varying grid parameters.
Innovation Solution
A method and apparatus that detect the grid frequency and calculate control parameters, specifically PI and filter parameters, to match the air conditioner's settings with the local grid frequency, allowing for stable operation across different grid environments without requiring changes to the driver board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photovoltaic air conditioners are controlled based on fixed local grid parameters, then the air conditioner can operate stably in its home market, but it cannot operate stably in other countries with different grid parameters
Solution Approach 1:
The control parameters of the air conditioner are made dynamic by detecting the grid frequency and automatically adjusting the control parameters based on the detected frequency. This allows the system to adapt to different grid environments (50Hz or 60Hz) without requiring manual intervention or hardware changes, resolving the contradiction between operational stability and grid frequency adaptability
Solution Approach 2:
The invention changes the control parameters (such as PWM frequency, switching frequency) based on the detected grid frequency. When the grid frequency is detected as 60Hz instead of the default 50Hz, the system automatically adjusts its control parameters to match the new grid conditions, enabling stable operation across different countries while maintaining adaptability
2Adaptability or versatility
If the control parameters are adjusted to match different grid frequencies, then the adaptability of the air conditioner is improved, but the control precision may deteriorate due to parameter deviations
Solution Approach 1:
The system implements feedback by continuously detecting the grid frequency and using this information to adjust the control parameters. This closed-loop approach ensures that the control parameters remain precisely matched to the actual grid conditions, preventing control deviations and maintaining high control precision while adapting to different grid frequencies
Data Source
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AI summary
A method for controlling a photovoltaic air conditioning system. The method comprises: detecting a grid frequency (101); when the detected grid frequency is not equal to a pre-set frequency, calculating and obtaining a control parameter according to the detected grid frequency (102); and controlling a photovoltaic air conditioning by means of the calculated and obtained control parameter (103). Also disclosed is a photovoltaic air conditioning control device.