Grid Current Distortion Suppression Based on Harmonic Voltage Feedforward for Grid-Forming Inverters
Abstract
:1. Introduction
2. Mechanism of GFM Grid Current Distortion Under Distorted Grid Conditions
3. Proposed Scheme for Improving Grid Current Quality Control
3.1. Analysis of Harmonic Current Suppression Principles
3.2. Harmonic Extraction Method Based on Fundamental Component Subtraction
3.3. Design of Feedforward Coefficient
3.4. Stability Analysis
4. Simulation Results and Discussion
4.1. Harmonic Suppression Under Mixed Harmonic Scenarios
4.2. Harmonic Suppression Under Unbalanced Grid Voltage Conditions
4.3. Harmonic Suppression Under Dynamic Load Changes and Harmonic Transients Conditions
4.4. Comparative Analysis with the Conventional Feedforward Control Method
5. Conclusions and Future Work
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Method | Characteristics | Advantages | Disadvantages |
---|---|---|---|
Virtual Impedance [12] | Reshapes loop gain to improve stability | Enhances weak-grid stability | Limited effectiveness in suppressing harmonic currents |
Dual-Sequence Control [13] | Suppresses negative-sequence voltage components | Effective under unbalanced grids | Does not address harmonic current distortion |
Unified Droop Control [14] | Distributes harmonic currents based on unit capacities | Improves PCC voltage quality | Complex implementation, limited focus on current quality |
Auxiliary Current Loop [15] | Limits overcurrent during faults using low-pass filters | Prevents overcurrent during faults | Limited applicability to harmonic suppression in normal operation |
Auxiliary Harmonic Elimination Unit [16] | Cancels ripple components via symmetric current generation | Reduces harmonic distortion | Untested for GFM architectures |
Parameter | Numerical Value |
---|---|
Internal Resistance of Grid-Side Line Rg/Ω | 2 |
Equivalent Inductance of Grid-Side Line Lg/mH | 5 |
Internal Resistance of Filtering Inductor Rf/Ω | 0.01 |
Filtering Inductance Lf/mH | 1.5 |
Filtering Capacitor Cf/µF | 20 |
Grid Voltage Ug/V | 220 |
DC Voltage Udc/V | 800 |
Switching Frequency fs/kHz | 20 |
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Liu, B.; Yu, B.; Zheng, F. Grid Current Distortion Suppression Based on Harmonic Voltage Feedforward for Grid-Forming Inverters. Electronics 2025, 14, 839. https://doi.org/10.3390/electronics14050839
Liu B, Yu B, Zheng F. Grid Current Distortion Suppression Based on Harmonic Voltage Feedforward for Grid-Forming Inverters. Electronics. 2025; 14(5):839. https://doi.org/10.3390/electronics14050839
Chicago/Turabian StyleLiu, Baojin, Bing Yu, and Feng Zheng. 2025. "Grid Current Distortion Suppression Based on Harmonic Voltage Feedforward for Grid-Forming Inverters" Electronics 14, no. 5: 839. https://doi.org/10.3390/electronics14050839
APA StyleLiu, B., Yu, B., & Zheng, F. (2025). Grid Current Distortion Suppression Based on Harmonic Voltage Feedforward for Grid-Forming Inverters. Electronics, 14(5), 839. https://doi.org/10.3390/electronics14050839