Portable Energy Storage Inverter Control for Overload Start-Up
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Solution Overview
Problem
Conventional portable electric energy storage systems face issues where loads exceeding the rated power of the inverter trigger immediate overload protection, leading to unsafe and inefficient operation.
Innovation Solution
A portable electric energy storage system with a power detector, comparators, and actuators that regulate the inverter's output power to prevent overload, allowing for safe and efficient operation of external AC loads by reducing instantaneous current impact and gradually adjusting power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inverter directly starts overload protection when a load exceeding rated power is connected, then the inverter is protected from damage, but the load cannot be used and instantaneous current impact is excessively high
Solution Approach 1:
The system performs preliminary detection of load power before full power delivery. The power detector detects present power Pt of the connected load, and the first comparator compares it with rated power Pe before the inverter commits to full power output, allowing preventive measures to be taken before damage occurs
Solution Approach 2:
The inverter's output power is dynamically adjusted based on real-time load detection. When overload is detected, the first actuator regulates output power to first preset power P1, and the second actuator gradually increases it to second preset power P2, creating a dynamic response rather than static protection
2Reliability
If the inverter directly starts overload protection when a load exceeding rated power is connected, then the inverter is protected from damage, but instantaneous current impact on the inverter is excessively high
Solution Approach 1:
The system cushions the instantaneous current impact by introducing a gradual power increase mechanism. When overload is detected, the inverter first outputs at first preset power P1, then the second actuator gradually increases power to second preset power P2 over time, preventing sudden current shocks to the inverter
Solution Approach 2:
The power detection and comparison actions are performed beforehand before full power delivery. The system detects present power Pt, compares it with rated power Pe, and takes preventive action by regulating to preset power P1 before the harmful instantaneous current impact can occur
3Productivity
If the inverter gradually increases output power to match load demand, then load operating efficiency is improved, but the control system complexity increases
Solution Approach 1:
The power regulation process is segmented into distinct stages: detection phase (power detector), comparison phase (comparators), first regulation phase (first actuator to P1), and second regulation phase (second actuator to P2). This segmentation makes the complex control process manageable and modular
Solution Approach 2:
The first and second preset powers P1 and P2 serve as intermediary power levels between the rated power Pe and full load power. These intermediary stages mediate the transition, allowing gradual power increase while maintaining simple control logic at each stage
Data Source
AI summary
A portable electric energy storage system and a power regulation method thereof are provided. The portable electric energy storage system includes a housing, and an inverter and an energy storage battery disposed in the housing, and further includes: a power detector configured to detect a present power Pt of a connected load; a first comparator configured to compare the present power Pt with a rated power Pe of the inverter; a first actuator configured to regulate an output power of the inverter to a first preset power P1 if the present power Pt is greater than the rated power Pe of the inverter; and a second actuator configured to gradually regulate the output power of the inverter to a second preset power P2 after the connected load is driven to start operation or operate for a period of time; or determine whether to stop driving output of the load.