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According to the demand of harmonic suppression and reactive power compensation for large-power electrical ac/dc converter systems, this paper proposes a new auto-inductive harmonic-suppression (AIHS) transformer and a corresponding inductive filtering technology, analyzes its harmonic model constructed by the transformer windings and the full-tuned circuit under the specific harmonic frequencies,...
DC bias is the problem that must be faced in the course of the design of the converter transformer for the high-voltage direct current (HVDC) transmission system, especially the new converter transformer that has the unique wiring scheme. This paper will theoretically analyze the basic cause of the dc bias of the new converter, and then according to the real no-load characteristic of the new converter...
This paper presents a new voltage source inductive filtering converter (VSIFC) for HVDC-light transmission system, which is mainly composed of the inductive filtering (IF) transformer and the related full-tuned (FT) branches with the commutating function for the self-commutated converter. This paper concerns on the technical feasibility on the application of VSIFC in HVDC-Light systems. Firstly, two...
Based on the wiring scheme and the operating principle of the inductive filtering converter transformer (IFCT), this paper analyzes the effect of harmonic on the converter transformer, and establishes the harmonic losses model for the traditional converter transformer (TCT) and the IFCT, respectively. Furthermore, according to the IEC61378-2 standard and the superposition principle, the harmonics...
The auto-compensation and harmonic shielding converter transformer, namely the new converter transformer, adopts the prolonged delta wiring in the secondary winding, and there is a tap between the common winding and the prolonged winding, which is connected with the inductive filters. Compared with the traditional converter transformer, the electrical connection in the new converter transformer is...
Aiming at shortcomings such as long test time, low-accuracy exiting in traditional direct current resistance measurement of winding, step response dynamic measurement method is put forward in this paper. Zero status response is obtained and linearized after step input is loaded on winding and direct current resistance is calculated using least square fitting. This method is realized on LabVIEW software...
The mechanical faults of a transformer are predicted with monitoring its vibration, which is a new technology put forward recently for condition based monitoring of transformers. The key technology of vibration method is how to identify the effective features of the vibration signal. Here, a new self-adapting time-frequency analysis method - local wave method which is developed from the empirical...
In this paper, an industry rectifier system based on the new rectifier transformer is introduced. In this new system, the continuously adjustable reactive power compensation and harmonic suppression are realized at the third winding of the new rectifier transformer. Based on this, the unique main circuit topological structure of the new system is analyzed, and then the main circuit parameters are...
The new converter transformer, that is the auto-compensation and harmonic-shielding converter transformer, adopts the self-coupling wiring for the secondary windings, and there is a tap at the linking point of the coupling windings, which is connected with the inductive filters. Compared with the traditional converter transformer, the electromagnetic transient state of the new converter transformer...
Compared with the traditional converter transformer, the auto-compensation and harmonic shielding converter transformer, namely, the new converter transformer, has a unique connection. In general, the difficult branches that only contain solitary voltage source sometimes appears in the mathematical modeling for the transformer, but the traditional nodal equations of the transformer are unable to be...
In the traditional AC/DC transmission system, to reduce the effect of harmonics to the AC system produced by the converter, filters and reactive power compensating equipments are installed in the primary side. This article presents a novel converter transformer and harmonic suppression scheme- filter commutated converter (FCC), which can greatly restrain the harmonic current from flowing into the...
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