Parallel Power Source Synchronization for Seamless AC Switching
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Solution Overview
Problem
Existing electrical power source devices face challenges in smoothly switching between external power sources and internal power storage units, leading to fluctuations in power supply to operating units.
Innovation Solution
An electrical power source device with parallel first and second electrical power storage units, each equipped with a conversion unit that converts DC power to AC, and a control unit that synchronizes the frequencies and phases of AC voltages from these units to ensure seamless power transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection/disconnection unit switches from disconnected state to connected state, then the electrical power storage units can supply power to the operating unit, but the electrical power supplied to the operating unit undergoes changes causing instability
Solution Approach 1:
The control unit performs preliminary synchronization of frequency and phase between the first and second electrical power conversion units before the connection/disconnection unit switches from disconnected to connected state. This preliminary action ensures that when parallel connection occurs, the electrical power supplied to the operating unit remains stable without sudden changes or fluctuations.
2Power
If multiple electrical power conversion units operate in parallel, then the power supply capacity increases, but the control complexity increases due to frequency and phase synchronization requirements
Solution Approach 1:
The control unit continuously monitors the frequency and phase of the electrical power from the first and second electrical power conversion units and dynamically adjusts their operation to maintain synchronization. This feedback mechanism enables multiple power conversion units to operate in parallel with increased power capacity while the control system automatically manages the complexity of frequency and phase coordination.
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 solution suppresses changes in electrical power supplied to the operating unit during source switching, maintaining a stable power supply and preventing reverse power flow, thus enhancing operational reliability and efficiency.
Implementation Method 1
the first electrical power conversion unit converts a direct current electrical power supplied from the first electrical power storage unit into an alternating current electrical power
Implementation Method 2
the second electrical power conversion unit converts a direct current electrical power supplied from the second electrical power storage unit into an alternating current electrical power
Implementation Method 3
the control unit controls the first electrical power conversion unit and the second electrical power conversion unit to perform a control so that first state quantities correlated with frequencies of alternating current voltages output from the first electrical power conversion unit and the second electrical power conversion unit are made to coincide with each other, and further, second state quantities correlated with phases of the alternating current voltages are made to coincide with each other
Data Source
AI summary
A power source device and a control method therefor execute control in which, when an interrupter switches from a blocked state to a connected state, a first state amount, which correlates to the frequency of A/C voltage out-put to the interrupter, from each of a first converter and a second converter match each other, and a second state amount correlating to the phase of the A/C voltage therefrom match each other.