DC Load Voltage Response Control for Stable Microgrid Operation
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Solution Overview
Problem
In DC microgrid systems, the passive unified response mode of DC loads to voltage changes leads to high frequency of DC voltage fluctuations, causing instability and incompatibility with certain DC appliances, such as a DC washing machine during power reduction.
Innovation Solution
A DC load response control method and apparatus that monitors utilization voltage, categorizes loads based on startup characteristics, and adjusts operations according to predefined voltage ranges and load types, allowing for dynamic power adjustments, operation waiting states, and intermittent operation to stabilize power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DC loads respond passively and uniformly to voltage changes, then the system implementation is simple, but the voltage fluctuation frequency increases causing instability
Solution Approach 1:
The patent segments DC loads into different categories (adjustable power loads, transferable power loads, and fixed power loads) based on their startup operation characteristics. This segmentation allows different control strategies to be applied to different load types, reducing overall voltage fluctuation frequency while maintaining manageable system complexity through standardized categorization.
Solution Approach 2:
The patent implements dynamic response control where loads adjust their operation based on real-time voltage conditions. Adjustable power loads modify their power consumption dynamically, transferable power loads shift their operation timing, and fixed power loads operate intermittently. This dynamic behavior reduces voltage fluctuation frequency while maintaining system stability.
2Stability of the object's composition
If DC loads adjust power dynamically to respond to voltage changes, then voltage stability improves, but device complexity increases
Solution Approach 1:
The patent changes operational parameters of DC loads based on voltage conditions. Adjustable power loads change their power consumption parameter, transferable power loads change their operation timing parameter, and fixed power loads change their operational state parameter. These parameter changes achieve voltage stability while maintaining relatively simple control logic for each load type.
3Ease of operation
If all DC loads respond uniformly to voltage changes, then control implementation is easy, but compatibility with certain DC appliances is poor
Solution Approach 1:
The patent applies different control strategies to different load types based on their specific characteristics. Adjustable power loads use power adjustment control, transferable power loads use timing shift control, and fixed power loads use intermittent operation control. This localized approach improves appliance compatibility while maintaining ease of operation through standardized control methods for each category.
Data Source
AI summary
The present disclosure relates to the technical field of smart home, and provides a direct current load response control method and device, and a direct current electric appliance. The direct current load response control method of the present disclosure comprises: monitoring a utilization voltage of a direct current load; determining whether the utilization voltage is within a response interval; and controlling the operation of the direct current load according to the determination result and the type of the direct current load.