Method and device for controlling photovoltaic air conditioning system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional photovoltaic air conditioners are unable to operate stably in different national grids due to fixed grid-connected driving control parameters, leading to control deviations, poor system response, and oscillations caused by mismatched filter and PI control parameters.
Innovation Solution
A method and apparatus that detect the grid frequency and calculate adaptive control parameters, including PI and filter parameters, based on the detected frequency to match the local grid conditions, allowing the air conditioner to adjust its operation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed grid-connected driving control parameters are used, then the air conditioner can operate stably in the preset grid environment (50 Hz), but it cannot operate stably in other national grids with different frequencies
Solution Approach 1:
The patent implements dynamic adjustment of control parameters based on detected grid frequency. The system transitions from fixed parameters to dynamically adaptive parameters that change according to the actual grid frequency, enabling stable operation across different national grids while maintaining reliability in the preset 50 Hz environment
Solution Approach 2:
The patent changes the control parameters (PI parameters and filter parameters) based on the detected grid frequency. By calculating and adjusting these parameters according to the actual frequency, the system achieves adaptability to different grids while preserving stable operation in the original 50 Hz grid
2Ease of manufacture
If control parameters are fixed for 50 Hz grid, then the system is simple to manufacture and control, but control deviations occur when operating in grids with different frequencies
Solution Approach 1:
The patent pre-calculates control parameters for multiple grid frequencies and stores them for quick retrieval and adjustment. This preliminary preparation allows the system to maintain ease of manufacture while achieving high control accuracy across different frequencies by selecting pre-optimized parameters
Solution Approach 2:
The patent implements a feedback mechanism where the system detects the actual grid frequency and adjusts control parameters accordingly. This closed-loop feedback ensures high measurement precision and control accuracy in different grids while maintaining relatively simple manufacturing through automated parameter adjustment
3Ease of manufacture
If the air conditioner is designed for a specific grid frequency, then production costs are lower, but the application range is limited to that specific grid environment
Solution Approach 1:
The patent makes the air conditioner universal by enabling it to operate in multiple grid frequency environments through parameter adjustment. The system maintains a single design for manufacturing while achieving multi-functionality across different national grids, thereby expanding application range without proportionally increasing production costs
Solution Approach 2:
The patent uses parameter changes to achieve universality. By adjusting control parameters based on detected grid frequency, the system can adapt to different national grids without requiring multiple hardware designs, thus expanding application range while keeping production costs relatively low
Data Source
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.