Photovoltaic Voltage Protection Switching for Grid and Appliance Modes
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Solution Overview
Problem
In photovoltaic electric appliance systems, the voltage protection values for grid connection and appliance operation are incompatible, leading to mismatched protection values that affect system performance.
Innovation Solution
A method and device that determine the operation mode of the photovoltaic electric appliance system based on the work states of the photovoltaic power generation module, electric appliance, and grid-connection module, setting different voltage protection ranges for each mode to ensure compatibility and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single voltage protection value is used for both grid connection and appliance operation, then the system structure is simple, but the voltage protection values become incompatible leading to mismatched protection
Solution Approach 1:
The patent implements dynamic switching of voltage protection values based on operation mode. The control unit determines whether the system is in grid-connection mode or appliance operation mode, and dynamically adjusts the voltage protection value accordingly. This resolves the contradiction by making the protection value adaptive rather than fixed, ensuring compatibility for each mode while maintaining a unified control structure.
Solution Approach 2:
The patent changes the voltage protection parameter based on operation mode. Different voltage protection thresholds are set for grid-connection mode versus appliance operation mode. This parameter adjustment ensures that the protection value is appropriate for each specific operational context, resolving the incompatibility issue while keeping the overall system structure relatively simple.
2Reliability
If different voltage protection values are set for grid connection and appliance operation modes, then voltage protection compatibility is achieved, but the control system complexity increases
Solution Approach 1:
The patent merges the voltage protection control for both modes into a single control unit that handles both grid-connection and appliance operation modes. Rather than having separate protection systems, one unified control mechanism determines the operation mode and applies the appropriate protection value. This reduces control system complexity while maintaining voltage protection compatibility through intelligent mode-based adjustment.
Solution Approach 2:
The control unit is designed with multi-functionality, serving both as the mode determination mechanism and the voltage protection controller. It universally handles both grid-connection mode and appliance operation mode protection requirements through a single integrated system, avoiding the need for separate dedicated protection systems for each mode.
3Productivity
If the photovoltaic power generation module generates excess energy for grid feedback, then energy utilization is improved, but voltage fluctuations may occur affecting system stability
Solution Approach 1:
The patent implements feedback control by continuously monitoring the operation mode and voltage conditions. When excess energy is fed to the grid, the system receives feedback about the grid-connection mode and adjusts the voltage protection value accordingly. This feedback mechanism helps maintain system stability during energy feedback operations by applying appropriate voltage protection thresholds that account for grid interaction dynamics.
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
The solution achieves compatibility of voltage protection values, improving system performance by setting appropriate voltage protection ranges for both grid connection and appliance operation modes, ensuring safe and efficient energy usage.
Implementation Method 1
a photovoltaic power generation module, an electric appliance, and a grid-connection module, electric energy generated by the photovoltaic power generation module
Data Source
AI summary
The disclosure provides a photovoltaic electric appliance system and a voltage protection value control method and apparatus thereof, and a controller. The photovoltaic electric appliance system includes: a photovoltaic power generation module, an electric appliance, and a grid-connection module. Said control method comprises-: acquiring the working states of the photovoltaic power generation module, the electric appliance and the grid-connection module; and according to the working states of each, determining an operation mode of the photovoltaic electric appliance system, and setting a voltage protection range of the photovoltaic electric appliance system according to the operation mode. By determining whether the grid-connection module is working, whether the electric appliance is working, and whether the photovoltaic power generation module is working, and by setting voltage protection values respectively for different working modes, the invention achieves the effect of compatibility of protection values and improves the system performance.