Power source quality management system and air conditioner
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Solution Overview
Problem
Existing power source quality management systems are inadequate in addressing harmonic currents generated by multiple devices connected to the electric power system, leading to insufficient countermeasures and suboptimal power factor improvement.
Innovation Solution
A power source quality management system comprising load devices, harmonic generation devices, current sources, and controllers that control harmonic currents and power factors to improve overall system quality by distributing compensation currents among multiple current sources, ensuring they operate within their maximum output capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single current source is used to compensate harmonic currents, then the device complexity is reduced, but the power source quality improvement is insufficient when multiple harmonic generation devices are connected
Solution Approach 1:
The patent divides the single current source into multiple current sources (first current source and second current source), where each current source is assigned to compensate harmonic currents from specific harmonic generation devices. This segmentation allows each current source to operate within its capacity while collectively improving power source quality for the entire system.
2Loss of energy
If the power source power factor is improved, then energy efficiency increases, but the input power factor of connection devices may deteriorate
Solution Approach 1:
The patent applies different control strategies to different connection devices based on their individual characteristics. The first connection device operates with a leading input power factor while the second connection device operates with a lagging input power factor, allowing each device to maintain optimal local power factor characteristics while the overall system achieves improved energy efficiency.
3Adaptability or versatility
If multiple harmonic generation devices are connected to the power source, then system functionality increases, but harmonic current generation increases
Solution Approach 1:
The patent segments the compensation function by assigning specific current sources to specific harmonic generation devices. The first current source compensates harmonics from the first harmonic generation device, and the second current source compensates harmonics from the second harmonic generation device, enabling effective harmonic current reduction while maintaining system functionality.
Solution Approach 2:
The controllers continuously monitor the harmonic currents generated by each harmonic generation device and adjust the compensation current from the respective current sources in real-time. This feedback mechanism ensures that harmonic currents are effectively counteracted while maintaining optimal power source quality.
Data Source
AI summary
A controller performs a first control for controlling the power source power factor or a power source harmonic of the harmonic current such that an input power factor of at least one of a plurality of connection devices changes in a direction preceding the power source power factor in a case where the power source power factor changes in a lagging direction, and performs a second control for controlling the power source power factor or the power source harmonic such that the input power factor of at least one of the connection devices changes in a direction lagging behind the power source power factor in a case where the power source power factor changes in a leading direction.