Dynamic Switchable Active Front End for Harmonic Mitigation
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Solution Overview
Problem
Oil rigs face challenges with harmonic currents generated by AC drive loads, which distort voltage and risk equipment failure, and existing Active Front End (AFE) and Active Harmonic Filter (AHF) systems can interact negatively, leading to over-voltage and system instability.
Innovation Solution
A Dynamic Switchable Active Front End (DSAFE)/Dynamic Switchable Active Harmonic Filtering (DSAHF) System integrates a processor-controlled Dynamic Switchable AHF and AFE, allowing the system to switch between AFE and AHF modes to manage harmonic currents and provide active filtering, using a shared hardware platform to optimize power distribution and reduce harmonic distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If AFE and AHF systems are used together to manage harmonic currents, then harmonic filtering capability is improved, but system instability and over-voltage risks increase due to negative interactions between the systems
Solution Approach 1:
The patent combines AFE and AHF systems into a single integrated platform where both functions share common hardware resources including DC bus capacitors, switching devices, and control circuitry. This merging eliminates the negative interactions between separate systems while maintaining both active front-end conversion and harmonic filtering capabilities, resolving the stability issue caused by system interactions
Solution Approach 2:
The integrated system is designed to perform multiple functions using shared components. The same DC bus capacitors serve both AFE voltage regulation and AHF harmonic compensation functions. The switching devices and control architecture universally support both operational modes, allowing the system to adaptively switch between AFE-only, AHF-only, or combined modes based on real-time power quality requirements
2Object-generated harmful factors
If separate AFE and AHF systems are deployed, then harmonic filtering and power conversion functions are provided, but device complexity and cost increase
Solution Approach 1:
The patent integrates AFE and AHF systems into a unified platform that shares common hardware infrastructure. The DC bus capacitors, switching devices (IGBTs/MOSFETs), and control processors are shared between both functions, eliminating redundant components and reducing overall system complexity while maintaining full AFE and AHF functionality
Solution Approach 2:
The system employs universal components that can operate in multiple roles. The DC bus capacitors universally provide both voltage smoothing for AFE and energy storage for AHF compensation. The control system universally manages both AFE power conversion and AHF harmonic injection, allowing a single system to replace what would traditionally require separate dedicated systems
Data Source
AI summary
A System and Method for a Dynamic Switchable Active Front End—Dynamic Switchable Active Harmonic Filtering System is disclosed.