Active filter device, air conditioning device, and air conditioning system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air conditioning systems and connected loads generate harmonic currents, which are not adequately addressed by current technologies, and there is a need to improve the fundamental power factor to reduce facility capacity and energy consumption.
Innovation Solution
An active filter device connected to a power converter, comprising a current source and a controller that generates compensation currents to reduce harmonic currents and improve the fundamental power factor, with the ability to superimpose currents to optimize performance based on available capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If only the harmonic current from the air conditioner is dealt with, then the harmonic current from the air conditioner is reduced, but the harmonic current from other devices connected to the electric power system is not addressed
Solution Approach 1:
The active filter device is designed to perform multiple functions: it compensates for harmonic currents from the air conditioner itself and simultaneously compensates for harmonic currents from other devices connected to the electric power system. The controller determines compensation currents based on the excess current capacity, enabling the device to adaptively handle multiple sources of harmonic distortion without requiring separate devices for each source.
2Object-generated harmful factors
If the active filter device uses its full current capacity for compensating harmonic current in the air conditioner, then the harmonic current from the air conditioner is effectively reduced, but the device cannot provide compensation for other devices on the distribution board
Solution Approach 1:
The controller dynamically adjusts the distribution of current capacity between compensating for harmonic currents in the air conditioner and compensating for harmonic currents from other devices on the distribution board. Based on the calculated excess current capacity (Cap - i1), the controller determines the second compensation portion (i2) that can be allocated to other devices, enabling flexible and adaptive resource allocation that maximizes overall compensation effectiveness.
3Reliability
If the fundamental power factor is not improved, then the existing facility capacity can be maintained, but facility capacity and energy consumption remain higher than necessary
Solution Approach 1:
The active filter device simultaneously addresses multiple power quality issues: it compensates for harmonic currents and improves the fundamental power factor. By generating compensation currents that address both harmonic distortion and reactive power components, the device achieves dual benefits of reducing harmonic distortion and improving power factor, thereby reducing facility capacity requirements and energy consumption without requiring separate devices.
Data Source
AI summary
A current source capable of generating a current of a first compensation portion for either or both reducing a harmonic current in an air conditioner or improving a fundamental power factor in the air conditioner is provided. If an excess of the current source is larger than a second compensation portion for either or both reducing a harmonic current in a power receiving path of a distribution board or improving a fundamental power factor in the power receiving path of the distribution board, a current obtained through superimposition of a current of a second compensation component and a current of the first compensation component is generated in the current source.