Residential Power Storage Voltage-Current Control
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Solution Overview
Problem
Residential electric power storage systems face challenges due to the high cost and short lifetime of electric power storage devices, especially when subjected to high discharging currents, and there is a lack of effective solutions for integrating these systems with solar photovoltaic power generation systems to optimize cost benefits.
Innovation Solution
A residential electric power storage system that includes an electric power generation device, a distribution line, a voltage sensor, a current sensor, and a controller to adjust power through a power converter, implementing current control when voltage is low and voltage control when voltage is high, to manage the charging and discharging of the electric power storage device and extend its lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the discharging current is increased to meet daytime power demand, then the power supply capability is improved, but the lifetime of the electric power storage device is shortened
Solution Approach 1:
The patent implements dynamic control of charging and discharging operations based on real-time voltage conditions. The controller adjusts the power converter operation dynamically: performing current control when voltage is below threshold and voltage control when voltage exceeds threshold, thereby optimizing the discharge rate according to system state and extending device lifetime while maintaining power supply capability
Solution Approach 2:
The patent changes operational parameters (control mode, current threshold, voltage threshold) based on system conditions. By switching between current control and voltage control modes and adjusting command values according to voltage levels, the system optimizes the discharge characteristics to balance power output and device longevity
2Reliability
If the electric power storage device is used for long periods to achieve leveled load benefits, then the economic advantage is improved, but the device requires replacement which increases cost
Solution Approach 1:
The patent employs feedback control by continuously monitoring voltage and current levels, and adjusting the power converter operation accordingly. The controller uses voltage threshold comparisons and current measurements to dynamically modify charging/discharging rates, ensuring optimal operation that extends device lifetime and maintains economic benefits over long periods
3Productivity
If the system integrates solar photovoltaic power generation to reduce costs, then the overall operation rate is improved, but the control complexity increases
Solution Approach 1:
The patent makes the power converter multi-functional by enabling it to operate in different control modes (current control and voltage control) and to handle both charging from solar power and discharging to meet demand. This universal design allows the same device to perform multiple functions, integrating solar photovoltaic power generation without requiring separate dedicated equipment, thereby reducing overall system complexity
Data Source
AI summary
A residential electric power storage system includes a lead-in wire, a distribution line, an electric power storage device, a voltage sensor sensing a voltage of the lead-in wire, a current sensor sensing a current charged to the electric power storage device through the distribution line and an electric power adjustment unit adjusting electric power charged to the electric power storage device through the distribution line; and a controller controlling the electric power adjustment unit. If the lead-in wire has voltage smaller than a threshold voltage, the controller controls the electric power adjustment unit to match the current that is charged to the electric power storage device to a command value to provide current control, whereas if the lead-in wire has voltage larger than the threshold voltage, the controller controls the electric power adjustment unit to match the voltage of the lead-in wire to a command value to provide voltage control.