Combined passive filter for electrified railway

Abstract

The utility model relates to the field of traction power supply systems, in particular to a combined passive filter for an electrified railway. A first capacitor and a first inductor form a first circuit; the third capacitor and the second circuit form a second circuit; the sub-circuit comprises a second capacitor, a second inductor and a second resistor, the second capacitor is serially connected with the second inductor, and the serially connected circuit is parallelly connected with the second resistor; the first circuit and the second circuit form a parallel circuit, one end of the parallel circuit is connected to the traction network, and the other end of the parallel circuit is connected with the first resistor in series. According to the utility model, part of passive devices can be shared through the combined passive filter, so that the filtering effect is achieved, the cost is saved, and the occupied area and the maintenance work are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to traction power supply system field especially relates to a kind of electrified railway combined passive filter. BACKGROUND

[0002] With the rapid development of electrified railway, the railway system continuously improves the requirement of power quality. Electrified railway obtains energy from power grid through traction power supply system, however, with the wide application of power electronic technology, especially the use of high-power frequency converter, rectifier and other equipment, a large amount of harmonic pollution is inevitably generated in railway power supply system. These harmonics not only affect the stability of power supply system, but also interfere with the operation of railway equipment, leading to premature aging of equipment, frequent failure, and even affecting the normal operation of train. In order to effectively control these harmonic interference and ensure the stability of power quality, installing filter becomes an indispensable technical means in electrified railway system. Filter can reduce harmonics, smooth current waveform and improve power quality and system operation efficiency in the power supply system of electrified railway. At the same time, with the improvement of national requirements on power quality and environmental protection, installing filter has become an important measure to comply with the specifications of power industry and ensure the safe operation of railway. Therefore, the effect and feasibility of researching and applying filter technology in electrified railway have become a key field in current electrified railway research, which has important academic and practical significance. SUMMARY

[0003] The utility model aims at providing a kind of electrified railway combined passive filter.

[0004] The technical scheme for realizing the utility model aims at providing a kind of electrified railway combined passive filter.

[0005] A kind of electrified railway combined passive filter, including single tuning filter and C type filter;The tuning frequency of the single tuning filter is 150Hz.

[0006] The single tuning filter includes first capacitor, first inductor and first resistor connected in series;Wherein first capacitor, first inductor form a circuit;

[0007] The C type filter includes third capacitor, filter subcircuit, first resistor connected in series;Wherein third capacitor, second circuit form a circuit;Wherein filter subcircuit includes second capacitor, second inductor, second resistor, second capacitor and second inductor are connected in series, and the circuit connected in series is connected in parallel with second resistor;The ratio of first resistor and second resistor is 30.

[0008] The first circuit and the second circuit form a parallel circuit, one end of the parallel circuit is connected to traction network, the other end is connected in series with the first resistor, and the other end of the first resistor is grounded.

[0009] The first resistor is shared by the single-tuned filter and the C-type filter.

[0010] The utility model discloses beneficial effect lies in, through combination formula passive filter can share partial passive device, reach filter effect's while can save the cost, reduce the floor area and maintenance work. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the schematic diagram of electrified railway combination formula passive filter. DETAILED DESCRIPTION

[0012] The utility model is further explained below in connection with the drawings and specific embodiment.

[0013] As Figure 1 Shown, a kind of electrified railway combination formula passive filter, including single-tuned filter and C-type filter;The tuning frequency of the single-tuned filter is 150Hz.

[0014] The single-tuned filter includes first capacitor C1, first inductor L1 and first resistor R1 in series connection in turn;Wherein first capacitor C1, first inductor L1 constitute circuit No.

[0015] The C-type filter includes third capacitor C3, filter subcircuit, first resistor R1 in series connection in turn;Wherein third capacitor C3, circuit No. 2 constitute circuit No. 2;Wherein filter subcircuit includes second capacitor C2, second inductor L2, second resistor R2, second capacitor C2 is connected in series with second inductor L2, the circuit of series connection is connected in parallel with second resistor R2;

[0016] The ratio of first resistor R1 and second resistor R2 is 30.

[0017] Circuit No. and circuit No. 2 constitute parallel circuit, and one end of parallel circuit is connected to traction network, the other end is connected with first resistor R1 in series, and the other end of first resistor R1 is grounded.

Claims

1. A combined passive filter for electrified railways, characterized in that, The single-tuned filter and the C-type filter are connected in parallel, one end of the parallel circuit is connected to the traction network, and the other end shares a resistor, and the resistor is grounded. The single-tuned filter comprises a first capacitor (C1), a first inductor (L1) and a first resistor (R1) connected in series; wherein the first capacitor (C1) and the first inductor (L1) form a first circuit. The C-type filter comprises a third capacitor (C3), a filter sub-circuit and the first resistor (R1) connected in series; wherein the third capacitor (C3) and the second circuit form a second circuit. The first circuit and the second circuit form a parallel circuit, one end of the parallel circuit is connected to the traction network, and the other end is connected in series with the first resistor (R1), and the other end of the first resistor (R1) is grounded.

2. A combined passive filter for electrified railways according to claim 1, characterized in that, The filter sub-circuit comprises a second capacitor (C2), a second inductor (L2) and a second resistor (R2), the second capacitor (C2) and the second inductor (L2) are connected in series, and the series circuit is connected in parallel with the second resistor (R2).

3. A combined passive filter for electrified railways according to claim 2, characterized in that, The ratio of the first resistor (R1) to the second resistor (R2) is 30.

4. The combined passive filter for electrified railway according to claim 1, characterized in that, The tuning frequency of the single-tuned filter is 150 Hz.

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