DC Power Supply Voltage Control for Long-Distance Bus Stability
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Solution Overview
Problem
In outdoor DC power supply systems where multiple bases with power supply converters are connected in an n-to-n relationship, current and voltage oscillations occur, leading to unstable power supply when power is transmitted over long distances, such as up to 4 km.
Innovation Solution
A control device is implemented to manage the DC power supply system by acquiring information about the bus between the power supply devices and the load, determining whether to execute voltage control based on this information and a threshold value, and adjusting the voltage of at least one power supply device to stabilize the power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If power is transmitted over long distances in outdoor DC power supply systems, then the power supply range is extended, but voltage and current oscillations occur leading to unstable power supply
Solution Approach 1:
The control device continuously monitors the bus voltage in the second base and compares it with a reference voltage. When the monitored voltage deviates from the reference, the control device adjusts the output voltage of power supply devices in the first base accordingly, creating a closed-loop feedback control system that stabilizes power supply over long distances
Solution Approach 2:
The system dynamically changes the output voltage parameter of power supply devices based on the monitored bus voltage conditions. By adjusting the voltage output of power supply devices in response to changing system conditions, the control device maintains stable power supply despite long transmission distances
2Adaptability or versatility
If multiple bases are connected in n-to-n relationship for bidirectional power supply, then power supply flexibility is improved, but current and voltage oscillations occur
Solution Approach 1:
The control device implements feedback control by monitoring the bus voltage in the second base and adjusting the output voltage of power supply devices in the first base. This feedback mechanism coordinates the operation of multiple bases in the n-to-n configuration, preventing oscillations while maintaining bidirectional power supply flexibility
Solution Approach 2:
The control device works to maintain equal potential conditions across the connected bases by adjusting power supply outputs. By coordinating the voltage levels between multiple bases through control, the system achieves stable operation while preserving the adaptability of bidirectional power supply
Data Source
AI summary
There is provided a control apparatus that executes control for a DC power supply system in which a plurality of bases including at least a first base including a first power supply device and a second base including a second power supply device and a load device are connected by electrical supply lines, the control apparatus including: an information acquisition unit that acquires information about a bus between the second power supply device and the load device; a determination unit that determines whether to execute voltage control in the DC power supply system, based on the information and a threshold value; and a control unit that executes voltage control on at least one of the first power supply device and the second power supply device in a case where the determination unit determines to execute the control.