Active filter system and air conditioning device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active filter devices face inefficiencies when operating at low output levels due to their design for maximum current, leading to suboptimal performance when multiple devices share the load.
Innovation Solution
An active filter system with multiple active filter devices of varying capacities, where the number and combination of operating devices adjust based on the magnitude of the compensating current to maximize efficiency and minimize the number of active devices in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple active filter devices are used to share the load, then the system can handle larger compensating currents, but the efficiency of individual devices decreases when operating at low output levels
Solution Approach 1:
The system dynamically selects and switches between different combinations of active filter devices based on the magnitude of compensating current. When current demand is low, fewer devices operate at high efficiency points; when current demand is high, more devices are activated. This dynamic reconfiguration resolves the contradiction by adapting the operating state to match the load requirements.
Solution Approach 2:
The system changes the operating parameters by selecting different device combinations according to compensating current magnitude. Each device is operated within its optimal efficiency range by adjusting which devices are active, rather than forcing all devices to operate uniformly. This parameter optimization maintains high efficiency across varying load conditions.
2Stability of the object's composition
If all active filter devices operate equally to share the load, then the system achieves balanced operation, but the overall system efficiency decreases due to devices operating at low-efficiency points
Solution Approach 1:
The system segments the active filter devices into different operational groups based on capacity and operating conditions. Instead of uniform operation, devices are selectively activated in segments according to the compensating current magnitude, allowing each active device to operate at its optimal efficiency point while collectively meeting the total load requirement.
Solution Approach 2:
The system introduces asymmetric operation where different numbers and combinations of devices are activated depending on load conditions. This asymmetric approach optimizes efficiency by matching the operational configuration to the specific compensating current magnitude, rather than maintaining symmetric equal-sharing operation.
3Power
If the number of operating active filter devices is increased, then the system can provide larger compensating current, but the cost and complexity of the system increases
Solution Approach 1:
The system dynamically adjusts the number of active devices based on the magnitude of compensating current. When large compensating current is required, more devices are activated; when smaller current is sufficient, fewer devices operate. This dynamic scaling reduces complexity during low-demand periods while maintaining the capability to handle high-power requirements when needed.
Data Source
AI summary
A plurality of active filter devices (41, 42, 43) that each have an output connected to a harmonic-generating load device (2) and are capable of generating a compensating current for performing at least one of reduction of a harmonic current of the harmonic-generating load device (2) and improvement of the power factor of the fundamental wave are provided. The plurality of active filter devices (41, 42, 43) provide two or more types of capacities, and the number and combination of operating active filter devices among the active filter devices (41, 42, 43) change in accordance with the magnitude of the compensating current.