Power Storage System Mode Switching for Load Response
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Solution Overview
Problem
Existing power storage systems struggle to quickly respond to changes in power consumption by loads, often taking too long to adjust output voltage to meet demand, especially when operating in maximum power point tracking (MPPT) control mode.
Innovation Solution
A power storage system that includes a power converting unit capable of operating in both MPPT and voltage control modes, with an integrated controller determining the control mode based on changes in power consumption or DC link voltage, allowing for rapid adjustment of the boosting ratio to meet load demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power converting unit operates in MPPT control mode to maximize power generation, then power generation efficiency is improved, but the response time to changes in load power consumption increases
Solution Approach 1:
The system dynamically switches between MPPT control mode and voltage control mode based on the rate of change of load power consumption. When the change exceeds a reference threshold, the system transitions to voltage control mode for rapid response; when the change is within the threshold, it operates in MPPT mode for maximum power generation efficiency.
Solution Approach 2:
The control strategy changes the operating parameters of the power converting unit by switching between two distinct control modes. In MPPT mode, the system optimizes for maximum power extraction; in voltage control mode, it prioritizes rapid voltage adjustment. The reference value for power consumption change determines when to switch between these parameter sets.
2Speed
If the boosting ratio is adjusted rapidly to meet changing load demands, then the response speed is improved, but the power generation efficiency decreases
Solution Approach 1:
The system employs dynamic mode switching where the control strategy adapts to the situation. During rapid load changes exceeding the reference threshold, voltage control mode enables fast response by adjusting the boosting ratio. During stable conditions within the threshold, MPPT mode maintains optimal power generation efficiency.
Solution Approach 2:
The controller continuously monitors the change in power consumption and periodically switches between control modes based on whether the change exceeds the reference value. This periodic assessment ensures the system operates in the optimal mode at each decision point, balancing speed and efficiency requirements.
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 system efficiently adjusts to changes in power consumption by switching between MPPT and voltage control modes, ensuring timely supply of power to loads, reducing the time taken to reach target voltages and improving power generation efficiency.
Implementation Method 1
a power converting unit for converting power generated by the power generation system into power having a DC link voltage
Implementation Method 2
an inverter for converting the DC link voltage into an alternating current (AC) voltage appropriate for the grid
Data Source
AI summary
A power storage system and a method of controlling the same include supplying power to a load by connecting a power generation system and a grid. The system includes a power converting unit that operates in one of at least two control modes including a maximum power point tracking control mode in which the power generation system is controlled to generate maximum power and a voltage control mode in which a boosting ratio is adjusted according to a change in the amount of power consumed by a load. The system also includes a direct current (DC)/DC converter for converting an output voltage of the power converting unit into a DC link voltage, an inverter for converting the DC link voltage into an alternating current (AC) voltage appropriate for the grid, and a central controller for controlling operations of the power converting unit, the DC/DC converter, and the inverter.