Inverter Grid Connection Control Using Nonlinear Power Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inverter control methods in new energy power supply systems are complex, costly, and prone to control errors due to the linear relationship between output voltage and frequency, leading to fluctuations at the grid connection point, which can endanger device safety and increase energy loss.
Innovation Solution
A power supply system and grid connection control method utilizing a power station collection module and an inverter collection control circuit to adjust output power, incorporating a power adjustment module and signal determining unit to determine reactive and active power adjustments based on nonlinear relationships between voltage and frequency, enabling precise control of the inverter output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional linear control method is used between output voltage and reactive power, then control implementation is straightforward, but control precision is poor and control errors are large
Solution Approach 1:
The patent changes the control parameter relationship from linear to nonlinear. Specifically, it establishes a nonlinear relationship between output voltage amplitude and reactive power, and between output frequency and active power, replacing the conventional linear control method. This nonlinear parameter transformation improves control precision while maintaining reasonable implementation complexity through dedicated calculation modules.
2Ease of operation
If detection point voltage and frequency are used for control, then control implementation is simple, but control errors increase due to difference from grid connection point parameters
Solution Approach 1:
The patent implements a feedback mechanism where the actual grid connection point voltage and frequency are continuously monitored, and the inverter output is adjusted based on the difference between detected parameters and target parameters. This closed-loop feedback ensures that control actions are based on accurate grid connection point conditions rather than intermediate detection points.
Solution Approach 2:
The patent introduces a control system as an intermediary between the inverter and the grid connection point. This intermediary processes the relationship between inverter output parameters and grid connection point parameters, calculating the required inverter output based on actual grid conditions, thereby eliminating the error introduced by using detection point parameters directly.
3Adaptability or versatility
If impedance of load or unstable power generation is present, then power supply flexibility is improved, but voltage and frequency fluctuations increase endangering device safety
Solution Approach 1:
The patent implements dynamic control where the inverter continuously adjusts its output power based on real-time grid connection point voltage and frequency conditions. The control system dynamically calculates the required active and reactive power output to counteract fluctuations caused by load impedance changes or unstable power generation, thereby maintaining device safety while accommodating flexible power supply conditions.
Data Source
AI summary
A power supply system and a grid connection control method. The power supply system includes a power supply, an inverter, a transformer, a power station collection module, and an inverter collection control circuit. The inverter collection control circuit is configured to obtain an amplitude value and a frequency of an output voltage of the inverter, obtain an inverter power adjustment signal based on the amplitude value and the frequency of the output voltage, and control, based on the power station power adjustment signal and the inverter power adjustment signal, the inverter to output a target output power. Additionally, an output power of the inverter may be adjusted by using the power station collection module and the inverter collection control circuit. A structure is simple, and a control method is simple. This improves control precision and adjustment efficiency, reduces control time, and reduces control costs.