Inverter Power System Feedback Control for Voltage Dip Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inverter power supply systems face instability and increased size and cost due to rapid voltage dips when load power consumption increases, as existing methods to mitigate these issues, such as increasing capacitance or improving rectifier response speed, are inefficient and costly.
Innovation Solution
The system incorporates a feedback circuit that detects excessive alternating current voltage and uses a feedforward current to adjust the direct current voltage output, compensating for the reference value of the alternating current to stabilize the system without requiring increased capacitance, thereby reducing system size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitance of the direct current bus is increased to reduce voltage dip amplitude and restore voltage faster, then stability of the inverter power supply system is improved, but size and manufacturing cost of the system increase
Solution Approach 1:
The control device performs preliminary action by detecting load power consumption changes and adjusting the rectifier's direct current voltage output in advance before the voltage dip fully develops. This proactive control prevents excessive voltage dips without requiring increased capacitance, thereby maintaining system stability while avoiding increased size.
2Reliability
If response speed of the rectifier is increased to reduce voltage dip recovery time, then stability of the inverter power supply system is improved, but manufacturing cost increases
Solution Approach 1:
The control device implements feedback control by continuously detecting the direct current bus voltage and load power consumption, then adjusting the rectifier's output voltage based on this feedback. This closed-loop control achieves fast voltage recovery and system stability without requiring expensive hardware modifications to increase rectifier response speed.
Solution Approach 2:
The invention replaces physical hardware modifications (such as increasing capacitance or using faster rectifier components) with a control-based solution. The control device uses detection and signal processing to achieve voltage stabilization, substituting mechanical/electrical hardware improvements with intelligent control algorithms.
3Object-affected harmful factors
If capacitance of the direct current bus is increased to prevent excessive quick voltage dip, then voltage dip amplitude is reduced, but manufacturing cost of the inverter power supply system increases
Solution Approach 1:
The control device changes operating parameters dynamically by adjusting the rectifier's direct current voltage output based on detected load conditions. Instead of using fixed large capacitance to handle all voltage dip scenarios, the system adaptively modifies voltage parameters to prevent excessive dips, reducing the need for oversized capacitive components.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides an inverter power supply system. The inverter power supply system includes an inverter circuit and a feedback circuit, where the inverter circuit is configured to convert a first alternating current voltage into a second alternating current voltage, and convert a first alternating current into a second alternating current; the feedback circuit determines whether a value of the second alternating current voltage exceeds a preset threshold; and when the value of the second alternating current voltage exceeds the preset threshold, the feedback circuit acquires a feedback current, compensates for a reference value of the first alternating current according to the feedback current, generates a control signal according to a reference value, after compensation, of the first alternating current, and outputs the control signal to the inverter circuit to adjust the value of the second alternating current voltage.