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Jun 24,2026
When a sinusoidal voltage is applied to a non-linear circuit, both the resulting current and the voltage waveform become non-sinusoidal. Through Fourier series decomposition of these non-sinusoidal waves, the component with a frequency equal to the power system frequency is identified as the fundamental wave, while components with frequencies higher than the fundamental are termed harmonics. A vas...
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Jul 01,2026
APF and SVG are two important devices used in power systems to improve power quality. We frequently encounter them in our work; what are the differences between them, and what are their functions? 1.What is APF? The Active Power Filter (APF) is a specialized device for mitigating power harmonics, developed using modern power electronics and digital signal processing technology based on high-speed ...
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Jul 16,2026
In industrial production, enterprises often face two major challenges: fluctuating production efficiency and persistently high electricity costs. Most of the time, managers attribute these problems to aging equipment and improper operation by personnel, overlooking a hidden killer lurking in the power system—harmonics. As "electrical pollution" in the power system, harmonics not only directly incr...
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Jul 20,2026
How Active Power Filters Improve Power Quality in Solar PV Systems As the global adoption of photovoltaic (PV) systems continues to accelerate, maintaining excellent power quality has become just as important as generating clean energy. While solar power offers significant environmental and economic benefits, integrating large-scale PV systems into modern electrical grids also introduces new techn...
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Jul 30,2026
I. Generation of Harmonics In power systems, the fundamental cause of harmonics is the presence of non-linear loads. When current flows through a load and does not maintain a linear relationship with the applied voltage, a non-sinusoidal current is formed, resulting in the generation of harmonics within the circuit. Due to the switching operations of semiconductor thyristors and the non-linear cha...
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Aug 13,2026
1.Why is reactive power compensation necessary? Reactive power is by no means useless power. In AC power supply systems, inductors and capacitors serve as essential loads. Ferromagnetic loads—such as electric motors and transformers—cannot function without inductive reactive power for excitation; meanwhile, long-distance transmission lines possess inherent capacitive characteristics, effectively a...
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Aug 19,2026
In power quality management, different voltage levels often require different harmonic mitigation strategies. In low-voltage systems, Active Harmonic Filters (AHFs) are widely used because they offer flexible and precise harmonic compensation. However, when it comes to medium- and high-voltage power systems, passive Filter Capacitor (FC) systems remain a more common and practical solution. So, why...
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