DC Power Supply Controller Reduces Battery Cycling
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Solution Overview
Problem
Conventional DC power supply systems with both AC and DC loads face increased charging and discharging cycles of storage batteries due to the interaction between AC and DC load power consumption, leading to inefficient battery management and potential discharge issues.
Innovation Solution
A DC power supply system with a controller that manages power distribution between a solar power generation device, a secondary battery, and a DC-AC converter, prioritizing power from the power system to the DC load when the solar power is insufficient, thereby reducing the frequency of battery charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the conventional control method considering only AC load deviation is used, then the control is simple, but the number of charging/discharging cycles of the storage battery increases
Solution Approach 1:
The power supply system is segmented into independent AC load control and DC load control pathways. The controller separately calculates power deviations for AC loads and DC loads, allowing independent optimization of each pathway without interfering with the other, thereby reducing unnecessary battery cycling while maintaining control simplicity.
Solution Approach 2:
The controller acts as an intermediary that introduces a power system supply detection mechanism. It detects whether the power system can supply power to the DC load and uses this information to mediate between solar power, battery power, and grid power, preventing unnecessary battery discharge when grid power is available.
2Device complexity
If the conventional control method is used, then the control logic is simple, but the storage battery may be discharged even when DC load power consumption does not change abruptly
Solution Approach 1:
The controller performs preliminary detection of power system supply capability before deciding to discharge the battery. By checking whether the power system can supply power to the DC load in advance, the system prevents unnecessary battery discharge and ensures battery reliability when DC load power consumption changes abruptly.
Solution Approach 2:
The control system implements feedback by continuously monitoring the power system's supply capability and adjusting battery discharge decisions accordingly. This feedback mechanism ensures that the battery is only discharged when truly necessary, improving discharge reliability while keeping control logic manageable.
3Device complexity
If the conventional control method is used, then the system structure is simple, but the power supply paths are not optimized leading to increased battery cycling
Solution Approach 1:
The system dynamically adjusts power supply paths based on real-time conditions. The controller detects power system supply capability and dynamically selects between solar power, battery power, and grid power for DC loads, optimizing the power supply path dynamically without requiring complex system restructuring.
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
This solution effectively reduces the number of battery charging and discharging cycles, ensuring reliable power supply and extending battery life by optimizing power distribution and usage based on load demands.
Implementation Method 1
a solar power generation device and a storage battery exist
Implementation Method 2
a secondary battery configured to supply electric power to the DC bus line
Implementation Method 3
a DC-AC converter connected between the DC bus line and an AC power system for converting a DC output supplied from the DC bus line into an alternating current or converting an AC power supplied from the power system into a direct current
Data Source
AI summary
A DC power supply system that limits the number of times of charging/discharging of the storage battery when a DC load is connected to a DC bus line. The system includes a DC bus line connectable to a DC load; a power generation device for supplying electric power to the DC bus line; a secondary battery for supplying electric power to the DC bus line; a DC-AC converter connected between the DC bus line and an AC power system; and a controller that controls power supply from the power generation device, the secondary battery, and the DC-AC converter to the DC bus line, and when the power supply of the power generation device cannot satisfy a power supply request of the DC load, the controller controls the DC-AC converter to supply electric power in preference to the secondary battery from the power system.