DC Micro-Grid Load Control Using Voltage-Based Communication
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Solution Overview
Problem
DC micro-grid systems face challenges in implementing smart home communication due to inadequate communication facilities, which increases system costs and complicates voltage management.
Innovation Solution
A control method that detects voltage change parameters on the power supply side, analyzes corresponding load control strategies, and dynamically adjusts load operations to manage voltage levels, enabling communication without dedicated communication circuits by utilizing voltage changes for smart device control in DC home systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated communication circuits are installed for smart device communication in DC micro-grid systems, then communication reliability is improved, but system cost and device complexity increase
Solution Approach 1:
The power supply system is designed to perform multiple functions: it not only provides power but also serves as a communication medium through voltage signal modulation. The load devices can both consume power and detect voltage changes to receive communication signals, eliminating the need for separate dedicated communication circuits.
Solution Approach 2:
The patent combines the power supply function and communication function into a single integrated system. The voltage control signals are merged with the power supply voltage, allowing communication data to be transmitted through the same physical medium (power lines) that carries electrical energy, thereby reducing system complexity.
2Reliability
If voltage control is implemented to manage voltage fluctuations in DC micro-grids, then power quality is improved, but control system complexity increases
Solution Approach 1:
The load devices are equipped with self-detection capabilities that allow them to autonomously monitor voltage changes and interpret communication signals without requiring complex external control systems. Each load can independently adjust its operation based on detected voltage variations, simplifying the overall control architecture.
Solution Approach 2:
The system implements feedback mechanisms where load devices detect voltage changes caused by control signals and respond accordingly. This closed-loop feedback enables automatic voltage regulation and communication response without requiring complex centralized control, maintaining power quality while simplifying system architecture.
3Quantity of substance
If voltage change parameters are used for communication signals, then communication cost is reduced, but measurement precision requirements increase
Solution Approach 1:
The patent utilizes changes in voltage parameters (magnitude, presence/absence of voltage) to encode communication signals. By modulating the voltage state to represent binary data (e.g., voltage present = 1, no voltage or different voltage level = 0), the system achieves communication functionality using existing power supply infrastructure without requiring additional communication hardware.
Solution Approach 2:
The patent replaces traditional electromagnetic communication methods (radio frequency, wired communication protocols) with electrical field-based signaling through voltage modulation. This substitution uses the existing electrical power infrastructure as the communication medium, eliminating the need for separate communication hardware and reducing overall system cost.
Data Source
AI summary
The present disclosure relates to a control method, a load and a power grid system. The method includes: detecting (S102) a voltage change parameter on a power supply side; analyzing (S104) a load control strategy corresponding to the voltage change parameter; controlling (S106) an operation of the load according to the load control strategy. The solution solves the problem of inadequate communication facilities in the DC micro-grid, the DC home communication can be completed without or with less dedicated communication circuits, accordingly the system cost is reduced.