Photovoltaic Air Conditioner Frequency Control Under Inverter Heat
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Solution Overview
Problem
Traditional air conditioner control methods are not applicable to photovoltaic air conditioners, leading to equipment damage and affected heating or cooling effects due to improper frequency limitation and reduction control.
Innovation Solution
A photovoltaic air conditioner control method that detects grid-side inverter module temperature and current in real time, determining intervals to perform frequency limitation and reduction control, using preset flag bits to adjust compressor frequency and prevent damage from excessive power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional air conditioner control methods are used to detect input voltage and current, then the control method is simple, but it cannot prevent equipment damage and maintain stable operation in photovoltaic air conditioners where power generation exceeds tolerance range
Solution Approach 1:
The patent introduces temperature and current dual-parameter detection as an intermediary mechanism between the photovoltaic power generation system and the compressor control system. By detecting both temperature (of inverter module and compressor) and current, the system achieves more reliable equipment operation protection than traditional voltage-current detection alone
Solution Approach 2:
The patent changes the detection parameters from traditional voltage-current only to temperature-current dual-parameter detection. Specifically, it detects inverter module temperature, compressor temperature, and grid-side current, then uses these parameters to dynamically adjust compressor frequency through multiple threshold levels, achieving better reliability
2Reliability
If frequency limitation and reduction control is implemented to prevent equipment damage, then equipment reliability improves, but heating or cooling effects are affected due to repeated frequency adjustments
Solution Approach 1:
The patent segments the frequency control into multiple distinct levels based on temperature and current thresholds: normal operation mode, frequency limitation mode (first threshold level), and frequency reduction mode (second threshold level). This segmentation allows the system to apply appropriate control strength for each situation, protecting equipment while minimizing impact on heating/cooling efficiency
Solution Approach 2:
The patent implements dynamic frequency adjustment where the compressor frequency is not fixed but dynamically changed based on real-time temperature and current conditions. The system can switch between normal operation, frequency limitation, and frequency reduction modes, and can recover to normal operation when conditions improve, making the protection adaptive rather than static
3Speed
If real-time detection of temperature and current is performed to enable rapid frequency adjustment, then equipment protection response speed improves, but control system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-setting multiple temperature thresholds (first temperature threshold, second temperature threshold) and current thresholds before operation. When detection values reach these pre-set thresholds, the system immediately triggers the corresponding frequency control action without requiring complex real-time calculation, achieving rapid response through advance preparation
Data Source
AI summary
A photovoltaic air conditioner control method and apparatus and a photovoltaic air conditioner. The method includes: detecting in real time the grid-connected side inverter module temperature and the grid-connected side current of a photovoltaic air conditioner; determining the interval in which the grid-connected inverter module temperature is located and the interval in which the grid-connected side current is located; and, on the basis of the determining results, performing frequency-limiting and frequency-reduction control of the photovoltaic air conditioner.