Microinverter Input Power Control via Battery Charging Feedback
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Solution Overview
Problem
Current methods for adjusting input power of microinverters in photovoltaic systems fail to accurately and effectively control input power, leading to potential malfunctions or damage due to exceeding rated power limits, which are influenced by factors like light intensity and temperature.
Innovation Solution
A method for adjusting input power of a microinverter through a photovoltaic energy storage system, involving a photovoltaic assembly, energy storage device, and microinverter, where charging parameters of the energy storage device are dynamically adjusted based on a mapping relationship between the power difference and preset intervals to ensure the input power of the microinverter aligns with a target value, using a controller to obtain and compare electrical energy information and adjust charging parameters until the power difference is within a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the microinverter operates at rated power limits to maximize energy conversion, then productivity is improved, but reliability deteriorates due to potential malfunctions or damage when input power exceeds rated power range
Solution Approach 1:
The system continuously monitors the actual input power of the microinverter and compares it with the target input power. Based on the power difference, the energy storage device dynamically adjusts its charging parameters (charging current or power) to provide feedback control, ensuring the microinverter operates within the rated power range while maximizing energy conversion.
Solution Approach 2:
The energy storage device changes its charging parameters (current or power) based on the calculated power difference between actual and target input power. By dynamically adjusting these parameters within different power difference intervals, the system maintains the microinverter input power within the rated range, resolving the contradiction between productivity and reliability.
2Power
If the input power of the microinverter is increased to meet higher energy demands, then power output is improved, but manufacturing precision deteriorates as it becomes difficult to accurately control and maintain the exact target power level
Solution Approach 1:
The system calculates the power difference between actual and target input power and uses this feedback to dynamically adjust the charging parameters of the energy storage device. This closed-loop control mechanism enables precise power control, maintaining accuracy even when operating at higher power levels to meet increased energy demands.
Solution Approach 2:
The energy storage device dynamically adjusts its charging parameters in real-time based on the power difference and predetermined intervals. This dynamic adjustment capability allows the system to maintain precise power control across varying operating conditions, resolving the contradiction between power output and control accuracy.
3Adaptability or versatility
If the photovoltaic panel output power is allowed to fluctuate freely according to environmental conditions, then adaptability is improved, but stability deteriorates causing unstable microinverter input power
Solution Approach 1:
The system monitors fluctuations in photovoltaic panel output power and uses feedback control to adjust the energy storage device's charging parameters. This maintains stable microinverter input power while allowing the system to adapt to environmental changes, as the energy storage device compensates for power fluctuations by adjusting its charging current or power.
Solution Approach 2:
The energy storage device acts as an intermediary between the photovoltaic panel and the microinverter. It buffers the fluctuations from the photovoltaic panel while maintaining stable power output to the microinverter, thus preserving both adaptability to environmental conditions and stability of input power.
4Device complexity
If simple power adjustment methods are used to reduce system complexity, then device complexity is reduced, but measurement precision deteriorates leading to inaccurate input power control
Solution Approach 1:
The system employs feedback control by continuously calculating the power difference between actual and target input power and using this information to adjust the energy storage device's charging parameters. This relatively simple feedback mechanism achieves high measurement precision and accurate power control without requiring complex adjustment mechanisms.
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 precise adjustment of input power, improving energy conversion efficiency and system stability by ensuring the microinverter operates within safe power limits, enhancing reliability and flexibility.
Implementation Method 1
a photovoltaic panel connected to separately connect to the microinverter and the energy storage device
Data Source
AI summary
Disclosed are a method for adjusting input power of a microinverter, a controller, and/or a photovoltaic energy storage system. A photovoltaic assembly may be connected to an energy storage device and a microinverter. In response to the received charging command including target input power of the microinverter, aspects described herein relate to obtaining an output voltage of a photovoltaic panel, an input current of the microinverter, and charging parameters of the energy storage device, then determining input power of the microinverter based on the input current of the microinverter and the output voltage of the photovoltaic panel. Then, aspects described herein may adjust charging parameters of the energy storage device until an absolute value of power difference between the input power and the target input power of the microinverter may be less than or equal to a preset power difference threshold.