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Power quality comprehensive control method and device for electric railway traction power supply system

A traction power supply system and power quality technology, applied in the direction of circuit devices, power network operating system integration, harmonic reduction devices, etc., can solve the problems of harmonic amplification, large footprint, large investment, etc., to suppress negative sequence components , the effect of suppressing voltage flicker

Active Publication Date: 2012-12-19
SOUTHEAST UNIV
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Problems solved by technology

However, due to the randomness of the load of electrified railways, the compensation effect is not ideal, and the passive filter can only control the harmonics of a specific order, and has the disadvantage of easily resonating with the grid impedance to cause harmonic amplification
Active filters can dynamically suppress the harmonics of electrified railways, but cannot eliminate the negative sequence current in electrified railways
If SVC compensators such as TCR are used, the unbalance of the power supply system can be effectively improved and the negative sequence current can be reduced. However, TCR itself will generate a large number of harmonics during operation, and a large-capacity filter must be used to filter out the electric iron itself. harmonics and harmonics generated by TCR, the equipment occupies a large area and the corresponding investment is large

Method used

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  • Power quality comprehensive control method and device for electric railway traction power supply system
  • Power quality comprehensive control method and device for electric railway traction power supply system
  • Power quality comprehensive control method and device for electric railway traction power supply system

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Embodiment Construction

[0037] The technical solution proposed by the present invention, such as figure 1 As shown, it includes: a passive filter composed of a third-order filter 1 and a second-order high-pass filter 2, which is used to provide reactive power for electrified railway electric locomotives and filter out harmonic currents generated by electric locomotives, Passive filters are connected in parallel on the 10kV bus; a set of voltage source converter devices 3 with energy storage battery packs as compensation devices are used to generate voltages with controllable amplitude, phase and frequency, which is equivalent to a voltage source. Parallel to the 10kV bus through a phase reactor.

[0038] Such as figure 2 As shown, the voltage source converter in the above compensation device is a three-phase cascaded H-bridge structure, in which each phase is composed of a single-phase chain H-bridge converter 4 of N chain links, so that all chain links finally The synthesized output voltage harmonics...

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Abstract

The invention relates to a power quality comprehensive control method and a power quality comprehensive control device for an electric railway traction power supply system, which belong to the field of electric railway power supply. The power quality comprehensive control device comprises a passive filter consisting of a trinary filter and a second-order high-pass filter and a set of voltage source converter with an energy-storage battery, wherein the voltage source converter with energy storage is connected with a 10kV bus in parallel through a phase reactor and the passive filter and then connected with a 110kV power network through a power transformer. The method and the device can compensate for power factors of the electric railway power supply system and solve the power quality problems of three-phase imbalance, harmonic wave, voltage fluctuation, flickering and the like at the same time. Moreover, the method and the device give full play to the advantages of simple configuration and low cost of the passive filter and the advantages of small occupied area and low loss of the voltage source converter, so that the whole device has the optimal technology index and economic performance.

Description

Technical field [0001] The invention relates to a method and device for comprehensive control of power quality for electric railway traction power supply system, in particular to provide a reactive power compensation for electrified railways; control of active power; and control of negative sequence, harmonics, and voltage fluctuations A control device for comprehensive management of power quality such as flicker, belongs to the field of electrified railway power supply. Background technique [0002] The electric locomotive load in the electrified railway has the characteristics of non-linearity, low power factor and three-phase imbalance, which not only seriously affects the power quality of the electrified railway traction power supply system itself, but also affects the power quality of the surrounding power users along the railway. Therefore, effective measures must be taken to deal with power quality problems such as negative sequence, harmonics, flicker and reactive power o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01H02J9/06
CPCY02E40/30Y02B70/30Y02E40/40Y04S20/20
Inventor 赵剑锋王书征林梦涵
Owner SOUTHEAST UNIV
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