Active filter system and air conditioning device
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Solution Overview
Problem
Existing active filter systems face inefficiencies when multiple devices are equally responsible for output, as they operate at low-efficiency points due to being designed for maximum current capacity, leading to increased possibility of low-efficiency operation.
Innovation Solution
The active filter system dynamically adjusts the total capacity of operating devices based on compensating current magnitude, using combinations of active filter devices with different capacities to minimize the number of operating devices and optimize efficiency, with controllers determining the optimal combination and timing for maximum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple active filter devices are equally responsible for output, then the system can provide sufficient compensating current capacity, but the devices operate at low-efficiency points due to being designed for maximum current capacity
Solution Approach 1:
The patent implements dynamic operation mode switching that adapts the system configuration based on real-time compensating current requirements. The controller dynamically selects between series connection mode (for high capacity needs) and parallel connection mode (for efficiency optimization), allowing the system to transition from static equal-load distribution to dynamic optimized distribution based on actual power demands
Solution Approach 2:
The system changes operational parameters by switching between different connection configurations (series/parallel) and operation modes (first/second modes). This parameter change allows the same physical devices to operate at different efficiency points depending on the magnitude of compensating current required, resolving the contradiction between capacity and efficiency
2Reliability
If multiple active filter devices operate in parallel with equal load distribution, then the system achieves redundancy and reliability, but the number of operating devices increases continuous losses
Solution Approach 1:
The system applies partial action by having only the necessary number of active filter devices operate at any given time based on compensating current requirements. Instead of keeping all devices continuously active for maximum redundancy, the controller activates only the minimum required devices, reducing continuous losses while maintaining sufficient reliability for the current operational demands
3Power
If active filter devices are designed for maximum current capacity, then they can handle peak compensating current demands, but they operate at low-efficiency points during normal operation
Solution Approach 1:
The system dynamically adjusts its operational configuration based on real-time power demands. During peak compensating current demands, devices operate in series connection mode to provide maximum capacity. During normal operation, the system switches to parallel connection mode with optimized load distribution, allowing devices to operate at their most efficient points while still having the capability to handle peak demands when needed
Data Source
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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.