Active Filter Load Detection for Multi-Device Harmonic Suppression
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Solution Overview
Problem
Existing active filters in air conditioners are insufficient in addressing harmonic currents generated by other load devices connected to the same power system, requiring a solution that can effectively reduce harmonic currents and correct power factors without increasing the capacity of the active filter.
Innovation Solution
A device with a built-in active filter that operates based on load information detected from the AC power source, using a controller to manage current output and correct power factors, even when other load devices with harmonic currents are connected, by incorporating a phase modification unit to control reactive power and power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an active filter is provided in an air conditioner to prevent harmonic current, then the harmonic current of the air conditioner is reduced, but it cannot address harmonic currents from other load devices connected to the same power system
Solution Approach 1:
The active filter is designed to perform multiple functions: it suppresses harmonic currents not only from the air conditioner itself but also from other load devices connected to the same power system. The controller detects load information from external devices and adjusts the active filter's output accordingly, enabling one device to serve multiple purposes in harmonic suppression and power factor correction across the entire power system.
2Object-affected harmful factors
If the active filter capacity is increased to correct power factor and reduce harmonic currents from multiple devices, then the effectiveness improves, but the device complexity and cost increase
Solution Approach 1:
The active filter operates dynamically by continuously detecting load information from external devices and adjusting its output current in real-time. The controller modifies the active filter's behavior based on the detected harmonic content and power factor conditions, allowing a single active filter of fixed capacity to effectively handle variable loads from multiple devices without requiring oversizing.
Solution Approach 2:
The system incorporates a feedback mechanism where the controller detects load information from external devices and uses this information to adjust the active filter's output. This closed-loop control enables the active filter to respond adaptively to changing conditions in the power system, optimizing its performance for power factor correction and harmonic suppression based on actual measured parameters.
Data Source
AI summary
In a device with a built-in active filter, the device incorporating an active filter therein and being connected to an AC power source, the active filter operates based on a value detected by a load information detection unit detecting load information on an AC power source outside the device with a built-in active filter.