Power Control Apparatus Stand-Alone Operation Management
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Solution Overview
Problem
Power control apparatuses for stand-alone operations at consumer sites with distributed power supplies, such as photovoltaic cells, often fail to ensure continuous power supply to load equipment due to variable power output, leading to insufficient power and incorrect operation of the equipment.
Innovation Solution
A power control apparatus with a determination processing unit that assesses whether the supplied power meets the demanded power requirements, suspends the stand-alone operation if it does not, and re-executes the assessment at predetermined intervals or after a predetermined period, stopping the re-execution if the power shortfall persists, while communicating with a power management device to manage specific devices like space heaters or voice output devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stand-alone operation is continuously re-executed when power supply is insufficient, then the system attempts to restore proper operation, but the load equipment may operate unintentionally or incorrectly during power shortages
Solution Approach 1:
The determination processing unit performs preliminary assessment of power supply status before allowing stand-alone operation to proceed. By evaluating whether supplied power meets demanded power requirements in advance, the system prevents unintended equipment operation during power shortages while maintaining reliability when conditions are adequate.
Solution Approach 2:
The system implements a feedback mechanism where the determination processing unit continuously monitors power supply status and provides feedback to control the stand-alone operation. When power supply is insufficient, the feedback signal suspends the operation; when sufficient, it allows resumption, thereby preventing harmful unintended operation while ensuring reliability.
2Speed
If the determination processing unit frequently re-executes the stand-alone operation, then the system responds quickly to power changes, but the operational complexity and determination frequency increase
Solution Approach 1:
The determination processing unit executes determinations at predetermined intervals rather than continuously or excessively frequently. This periodic approach maintains adequate response speed to power changes while simplifying the control logic and reducing operational complexity compared to continuous monitoring and adjustment.
Data Source
AI summary
A power control device is provided at a customer site having a distributed power supply capable of supplying power and load devices and controls a stand-alone operation in which the power supplied from the distributed power supply is converted to AC power and supplied to the load devices. The power control device comprises: a determination processing unit for determining whether or not a power supply supplied from the distributed power supply during the stand-alone operation satisfies a power demand necessary for operating the load devices; and a supply control unit for, when it is determined that the power supply does not satisfy the power demand, intermitting the stand-alone operation. After intermitting the stand-alone operation, the determination processing unit re-executes the stand-alone operation and determines whether the power supply satisfies the power demand or not. When it is consecutively determined predetermined times that the power supply does not satisfy the power demand or when a predetermined period of time has elapsed without determining that the power supply satisfies the power demand after determining that the power supply does not satisfy the power demand, the determination processing unit stops the re-execution.