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Parallel mixed power filter for electrified railway

A technology for power filters and electrified railways, applied in electrical components, electric traction, active power filtering, etc., can solve the problems of large capacity of active power filters, negative sequence current generation, low power factor, etc., and achieve control mode Simple and reliable, prevents resonance, and suppresses effects

Inactive Publication Date: 2007-09-05
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are three main problems: large harmonic current, low power factor, and negative sequence current
However, due to the large capacity and high cost of the active power filter used alone, it has not been applied in China at present.

Method used

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  • Parallel mixed power filter for electrified railway
  • Parallel mixed power filter for electrified railway
  • Parallel mixed power filter for electrified railway

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Embodiment Construction

[0015] The parallel hybrid power filter for electrified railway and its working principle of the present invention will be further described in detail in conjunction with the accompanying drawings and embodiments.

[0016] In the present invention, firstly, the original passive filter with fixed frequency deviation is transformed into a purely tuned LC filter circuit and an additional inductance L a in series, and then control the active power filter APF as a current source, with the additional inductance L a Parallel connection together form a hybrid filter system. In this type of parallel hybrid power filter for electric railways, since the APF capacity of the active power filter is very small, it is less than 1% of the harmonic source capacity (the fundamental reactive current all flows into the additional Inductance L a , does not flow through the active filter), so it will not increase a lot of cost, but it can greatly improve the filtering effect of the original passive...

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Abstract

The parallel mixed power filter for electrified railway includes pure tuning passive LC filter Zf, additional inductor La, active power filter APF and coupling transformer. By means of composite control mode, the active power filter APF is controlled as controlled current source and connected serially with the passive filter Zf via the parallel combination of the coupling transformer and the additional inductor La to constitute parallel mixed filter system, which is connected to power network via breaker or thyristor. The system may be installed in drawn transformer station or inside locomotive to inhibit the influence of 'background harmonic' to passive filter in electrified railway without resonance between the passive filter and the power network impedance.

Description

technical field [0001] The invention relates to a hybrid power filter, and further relates to a parallel hybrid power filter for electrified railways. Background technique [0002] At present, power frequency AC rectifier electric locomotives (so-called AC-DC drive locomotives) are widely used in my country. There are three main problems: large harmonic current, low power factor, and negative sequence current. The current focus issue is harmonics. [0003] In order to solve the harmonic problem of electric locomotives, there are two basic ideas: one is to install compensation devices, and the other is to modify the locomotive so that it does not generate harmonics and has a power factor of 1. At present, the latter idea has been implemented in some countries, but it is almost impossible to transform the AC locomotives in operation. Aiming at the harmonic problems generated by a large number of electric locomotives in operation in my country at pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18H02M1/12B60L9/00
CPCY02E40/22H02J3/1842B60L9/005B60L2200/26Y02E40/20
Inventor 王跃王兆安杨君段勇符志平滑亚瀚
Owner XI AN JIAOTONG UNIV
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