Power Factor Control System Dynamic Target Adjustment
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Solution Overview
Problem
Current demand control systems for power-consuming apparatuses do not effectively address the decrease in power-source power factor, leading to increased electricity charges and potential penalties, as they fail to optimize the power-factor control efficiently.
Innovation Solution
A power-source power factor control system that dynamically adjusts the operation state of load apparatuses based on real-time power-source power factor measurements, using a variable target value to optimize the power factor while minimizing changes in operation capability, thereby improving and stabilizing the power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If demand control is performed based on amount of power only, then power consumption is reduced, but power-source power factor deteriorates
Solution Approach 1:
The system changes the control parameter from amount of power only to a composite parameter that includes both amount of power and power-source power factor. The demand control signal is generated based on both parameters, allowing simultaneous optimization of power consumption and power factor by adjusting load operation states according to the combined demand index.
2Reliability
If load apparatus operation capability is actively changed to optimize power factor, then power-source power factor is improved, but operation capability of load apparatus deteriorates
Solution Approach 1:
The system dynamically adjusts the target value of power-source power factor based on the current operational state of load apparatuses. Instead of fixed power factor targets, the system modifies targets in real-time to balance power factor improvement with minimal impact on load operation capability, using dynamic weighting between power factor and operation capability.
Solution Approach 2:
The system applies partial action by selectively adjusting only certain load apparatuses or certain operational parameters of loads rather than uniformly reducing all load capabilities. This allows power factor optimization through targeted adjustments while maintaining overall operation capability.
3Ease of operation
If fixed target value of power-source power factor is used, then control simplicity is maintained, but adaptability to varying power factor conditions deteriorates
Solution Approach 1:
The system transitions from static fixed target values to dynamic target values that automatically adapt to varying power factor conditions. The target value is calculated based on current power factor measurements and load characteristics, providing both simplicity through automated calculation and adaptability to changing conditions.
Solution Approach 2:
The system implements feedback mechanisms where actual power factor measurements are continuously monitored and used to adjust the target value. This closed-loop control provides adaptability to varying conditions while maintaining ease of operation through automated feedback-based target adjustment.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(f)
AI summary
A load apparatus (1, 2) is connected to an AC power source (3) and is supplied with power from the AC power source (3). An operation state control unit (1c, 2c) controls, based on a target value about a power-source quality including either a power-source power factor of the AC power source (3) or a power-source harmonic of the AC power source (3) and on a present power-source quality, an operation state of the load apparatus (1,2).