Power Management Apparatus for Renewable Energy Load Protection
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Solution Overview
Problem
Existing renewable energy generation systems face challenges in managing power dispatch based on load conditions, leading to increased difficulty and potential harm to system reliability, and lack protection for loads during abnormal operations.
Innovation Solution
A power management apparatus connected to renewable energy generation, AC utility, and load systems, featuring a power conversion unit, sensing units, and a switch unit controlled by a control unit to manage power flow and disconnect AC utility from the load during abnormal conditions, allowing for grid-connection or stand-alone operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electricity generation is determined according to maximum output power of renewable energy apparatuses for dispatching power, then power generation capacity is maximized, but difficulty of power dispatching increases and system reliability deteriorates
Solution Approach 1:
The patent implements dynamic power dispatching that adapts to real-time load conditions rather than operating at fixed maximum output. The control unit adjusts the operating point of renewable energy apparatuses based on actual demand, enabling the system to transition between grid-connected and stand-alone modes dynamically. This resolves the contradiction by making power generation flexible rather than static, maintaining reliability while optimizing productivity.
Solution Approach 2:
The patent employs feedback mechanisms where the control unit continuously monitors load conditions and adjusts power dispatching accordingly. Sensors detect system state parameters and feed this information back to the control unit, which then modifies the operating mode (grid-connected or stand-alone) and power output levels. This closed-loop control ensures reliable operation by responding to actual system conditions rather than operating at predetermined maximum capacity.
2Device complexity
If renewable energy generation system operates without additional switch unit and sensing units, then device complexity is reduced, but ability to protect load during abnormal operation is lost
Solution Approach 1:
The patent introduces a switch unit as an intermediary component between the renewable energy apparatus and the load. This switch unit, controlled by the control unit, acts as a protective mediator that can disconnect the load from abnormal conditions (such as grid failures or system anomalies) while maintaining normal operation during standard conditions. The switch unit adds minimal complexity but provides crucial protection functionality by isolating the load from harmful factors.
Solution Approach 2:
The patent implements preliminary protective actions through the switch unit and sensing units that detect abnormal conditions before they can harm the load. The control unit is pre-programmed with protection strategies that automatically activate when sensors detect critical parameters, disconnecting the load in advance before damage can occur. This preliminary action approach maintains simplicity while ensuring load protection through automated safety 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
The solution enables smart power management by determining output power based on ambient conditions, providing high availability and quality of power supply, and increasing system reliability by disconnecting AC utility from the load during abnormalities, thus protecting the load and optimizing energy usage.
Implementation Method 1
a power conversion unit (402), a first sensing unit (404), a second sensing unit (410), a switch unit (406), and a control unit (408). The power conversion unit (402) converts output power generated from the renewable energy generation apparatus (10)
Data Source
AI summary
A power management apparatus and a method of operating the same are disclosed. The power management apparatus includes a power conversion unit, a first sensing unit, a second sensing unit, a switch unit, and a control unit. The power conversion unit converts output power generated from at least one renewable energy generation apparatus. The first sensing unit is provided to sense a first current and a first voltage and the second sensing unit is provided to sense a second current and a second voltage. The control unit acquires an output power generated from the renewable energy generation apparatus and acquires a feedback power to an AC utility according to the currents and the voltages when the control unit turns on the switch unit.