Power source quality management system and air conditioning apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air conditioning systems face challenges in managing power source quality, particularly when power source quality improvement devices like active filters fail, leading to increased power-source currents and electric powers that can exceed the capacity of power receiving facilities, potentially causing damage and burnout.
Innovation Solution
A power source quality management system that includes a load apparatus, a power source quality improvement unit (such as an active filter or PWM converter), a failure determination unit, and an operation limiting unit. The system limits the operation of the load apparatus when a failure is detected, ensuring that power-source currents and electric powers do not exceed maximum values, thereby preventing overload and damage to facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power source quality improvement device fails, then the compressor operation can continue, but the power-source current and electric power may exceed the capacity of power receiving facilities, causing damage and burnout
Solution Approach 1:
The control device continuously monitors the operation state of the power source quality improvement device and provides feedback to adjust the compressor operation. When a failure is detected, the control device receives a notification and automatically limits the compressor operation to prevent power overload, creating a closed-loop control system that responds to changing conditions.
Solution Approach 2:
The system dynamically adjusts the compressor operation based on the operational status of the power source quality improvement device. The control device changes the operating parameters of the compressor in real-time according to whether the power source quality improvement device is functioning normally or has failed, making the system adaptable to different operational states.
2Device complexity
If the power source quality improvement device is removed or fails, then system complexity is reduced, but power-source harmonic increases and power factor deteriorates
Solution Approach 1:
The control device is pre-programmed with knowledge of the power source quality improvement device's function and failure modes. When a failure is detected, the control device immediately implements pre-planned control strategies to limit compressor operation and prevent harmful effects, acting in advance to mitigate potential damage before it occurs.
3Reliability
If the compressor operation is limited when power source quality improvement device fails, then power receiving facilities are protected, but the cooling or heating capacity is reduced
Solution Approach 1:
The control device implements partial operation limitation of the compressor rather than complete shutdown. By adjusting the compressor operation to a reduced but non-zero level, the system provides sufficient protection to power receiving facilities while maintaining a baseline level of cooling or heating capacity, avoiding excessive restriction of productivity.
Data Source
AI summary
A power conversion device (3) is supplied with an electric power from an alternating current power source (1). An active filter device (2), which is a power source quality improvement unit, improves a quality of the alternating current power source (1). A controller (37) limits an operation of the power conversion device (3) so that any one of a power-source electric power, a power-source current, and a power-source harmonic obtained when a failure detection unit (4) detects a failure of the active filter device (2) becomes less than or equal to a maximum value of a corresponding one of the power-source electric power, the power-source current, and the power-source harmonic, the maximum value being obtained when no failure has occurred in the active filter device (2).