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Different from the traditional converter transformer and ac passive filtering method, this paper presents a new converter transformer and a corresponding inductive filtering method for HVDC systems. Based on this, characteristic parameters of the new converter transformer are studied in detail by theoretical analysis, simulation, calculation, and experimental verification. By deducing voltage relation,...
Zero-sequence harmonics caused by nonlinear loads usually result in high voltage distortion levels throughout the facility, neutral conductor overloading, motor heating, transformer heating, increased losses, and excessive harmonic injection onto the utility supply system. This paper presents a novel method to eliminate zero-sequence harmonics by using Zero-sequence Resister Block (ZRB) and Zig-Zag...
In this paper, a novel principle of a power quality conditioner based on controllable impedance is proposed for high voltage AC power distribution systems application. A linear transformer is employed to act as controllable impedance under the control of power electronic inverter. On the one hand, the transformer can always exhibit nearly zero impedance to harmonic current. Thus, the harmonic current...
This paper presents a novel method to suppress neutral harmonic currents in three-phase four-wire power systems. The significant advantages include low cost, high reliability, good effectiveness, free of LC resonance and flexible installation location. Furthermore, under unbalanced loading, only harmonics in the neutral current are suppressed while the fundamental currents are not affected. In the...
In the paper, a novel practical series hybrid active power filter based on the fundamental magnetic flux compensation of the series transformer is proposed. The power filter adopts the combined structure of a shunt passive filter and a series active filter by placing a series transformer's primary winding between power utility and harmonic-producing loads. The secondary winding of the transformer...
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