IGBT Inverter Power Factor Adjustment at Distributed Generation
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Solution Overview
Problem
Conventional methods for adjusting the power factor in AC power distribution grids are limited to constant adjustments at central locations, failing to optimize power factor at individual customer sites, leading to inefficiencies due to variations in inductive and capacitive elements and lack of real-time adjustments.
Innovation Solution
A method and system that utilize a distributed power source to generate or store DC power, convert it to AC, and adjust the power factor by an IGBT inverter based on calculated or measured AC power factors from the grid, allowing for periodic matching of the power factor to optimize energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional passive devices (capacitors and inductors) are used to adjust power factor at central substations or end user sites, then power factor adjustment is achieved, but the adjustment is constant and cannot adapt to real-time variations in grid conditions and customer load requirements
Solution Approach 1:
The patent applies dynamics by transitioning from static passive power factor adjustment devices to a dynamic inverter-based system that continuously monitors grid conditions and actively adjusts power factor in real-time. The inverter dynamically modifies its output to match changing load requirements and grid conditions, resolving the contradiction between adaptability and complexity through intelligent control.
Solution Approach 2:
The system implements feedback by continuously measuring actual power factor at the customer site and comparing it with target values. The controller uses this feedback information to adjust the inverter's operation, creating a closed-loop control system that automatically adapts to changing conditions without requiring complex manual intervention.
2Productivity
If distributed power generation units are deployed to adjust power factor at customer sites, then real-time power factor optimization is achieved, but the system complexity and control requirements increase
Solution Approach 1:
The inverter is designed with multi-functionality, serving both as a power conversion device and a power factor correction device. By integrating these functions into a single unit, the system achieves improved energy distribution efficiency without proportionally increasing overall system complexity, as the inverter performs multiple roles simultaneously.
Solution Approach 2:
The system implements self-service through autonomous operation where the inverter automatically monitors its own performance and the grid conditions, then adjusts its output without external intervention. The controller autonomously calculates required adjustments and implements them, reducing the need for complex external control infrastructure.
3Measurement precision
If constant power factor adjustment is applied at central substations, then grid-wide power factor management is achieved, but local variations in power factor at individual customer sites cannot be optimized
Solution Approach 1:
The patent applies segmentation by dividing the power factor management function from the central substation level down to individual customer sites. Each customer site independently measures and manages its own power factor, allowing precise local optimization without requiring complex centralized coordination of multiple local conditions.
Solution Approach 2:
The inverter acts as an intermediary device at the customer site that locally measures power factor conditions and implements corrections. This intermediary approach enables precise local measurement and adjustment without requiring direct complex intervention from central substation equipment, simplifying the overall monitoring architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables dynamic adjustment of power factors at customer sites, improving energy distribution efficiency by matching the power factor to the grid's requirements, reducing transmission inefficiencies and optimizing both real and reactive power usage.
Implementation Method 1
converting the DC power to an alternating current (AC) power at the customer location... determining a power factor for the conversion of DC power to AC power... and the conversion of the DC power to the AC power sets the power factor for the AC power to match the determined power factor
Data Source
AI summary
A method to add locally generated real and reactive power to a power distribution grid including: generating or storing direct current (DC) power by distributed power source; converting the DC power to an alternating current (AC) power; calculating or measuring a power factor of the AC power provided from the distribution grid; determining a power factor for the conversion of DC power to AC power based on the power factor for the AC from the distribution grid, and the conversion of the DC power to the AC power sets the power factor for the AC power to conform to the determined power factor.