Power Quality Compensation System with Dynamic Current Threshold Control
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Solution Overview
Problem
Conventional power quality compensation systems frequently experience over-voltage and over-current protection issues due to peak current processing limitations, leading to unreliable operation and shutdowns when dealing with nonlinear loads.
Innovation Solution
A power quality compensation system with enhanced peak current processing units and dynamic current threshold adjustment, which includes multiple peak current processing units and a current threshold adjustment mechanism to manage DC bus voltage and current thresholds dynamically, preventing frequent over-voltage and over-current protection measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the active power instruction of the bus voltage loop is increased, then power quality compensation capability is improved, but the output current exceeds the preset current threshold and over-current protection is frequently triggered
Solution Approach 1:
The patent implements dynamic current threshold adjustment through the current threshold adjustment unit, which modifies current thresholds in real-time based on voltage loop control signals and system operating conditions. This dynamic adjustment allows the system to increase active power instruction for improved compensation capability while adapting current thresholds to prevent over-current protection triggers, ensuring continuous operation.
Data Source
AI summary
A power quality compensation system has the functions of controlling the bus voltage and the current peak value. A first instruction current under control of a first peak current processing unit is lower than or equal to a first current threshold value. A second peak current processing unit outputs a second PWM driving signal according to a sampled current and a second current threshold value. A third peak current processing unit outputs a third PWM driving signal according to the sampled current and a third current threshold value. A conversion unit is operated according to the PWM driving signals. Moreover, the first current threshold value is adjusted in real time according to the comparing result of the sample current and the first current threshold value and the comparing result of the real DC bus voltage and the reference DC bus voltage.