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May 08,2026
1.What is 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, meaning harmonics are generated in the circuit. Harmonic frequencies are integer multiples of the fundamental frequency. As proven by the French math...
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May 25,2026
1. Introduction Three-phase unbalance is a prevalent power quality issue in low-voltage distribution systems, mainly caused by dispersed single-phase loads, charging piles and residential electricity consumption. Two mainstream solutions are widely used in the industry: mechanical relay phase-switching balancers and IGBT-based active compensation devices (SVG/APF/Active Load Balancer). This articl...
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Jun 18,2026
Choose the right one, not the most expensive one. This principle also applies to reactive power compensation. In the power industry's reactive power compensation process, the selection of high-voltage reactive power compensation equipment has always been crucial. Today, we'll discuss the applicable scope of high-voltage reactive power compensation equipment. In the context of reactive power compen...
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Jun 23,2026
Understanding Four-Quadrant Reactive Power Compensation Controller The four-quadrant reactive power compensation controller solves this pain point with full-range PQ vector detection. It accurately distinguishes four operating modes: grid supply with inductive loads, grid supply with capacitive loads, on-site power generation with inductive reactive power, and grid feedback with capacitive reactiv...
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Jul 03,2026
Many charging station operators have a question: when charging piles are charging normally, the power factor is perfectly within the standard range, and there are no problems even without capacitor banks or SVG. However, when the station is newly built, there is little traffic, or there is no one charging at night, the power factor inexplicably exceeds the standard, resulting in power factor adjus...
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