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Power quality comprehensive compensation system of electric railway and control method thereof

A technology for electrified railways and power quality, applied in reactive power compensation, reactive power adjustment/elimination/compensation, AC network to reduce harmonics/ripples, etc., can solve the large demand for RPC capacity, large engineering design, and cost High-level problems, to achieve the effect of fast response speed, device cost reduction, and capacity reduction

Inactive Publication Date: 2010-05-19
HUNAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

RPC can comprehensively control power quality problems such as negative sequence, harmonics and reactive power of electrified railways, but the demand for RPC capacity is too large, which brings great difficulty to engineering design and high cost
In the prior art, there is a thyristor-controlled switching capacitor TSC, which can adjust large-capacity reactive power step by step, and the cost is low

Method used

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  • Power quality comprehensive compensation system of electric railway and control method thereof
  • Power quality comprehensive compensation system of electric railway and control method thereof
  • Power quality comprehensive compensation system of electric railway and control method thereof

Examples

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Embodiment Construction

[0049] see figure 1 , is the structure diagram of the railway static power regulator RPC, including two converters in a back-to-back structure sharing a DC side capacitor C, whose output reactance is connected to the two power supply arms of the traction network through a step-down transformer, and controlled by the two converters It can realize the two-way flow of power, and can realize the comprehensive compensation of negative sequence, harmonic and reactive power, but the capacity requirement is relatively large.

[0050] see figure 2 , is the structural diagram of the integrated power quality compensation system for electrified railways, including an active device railway static power regulator RPC and two sets of thyristor control capacitors TSC. Two groups of thyristor controlled capacitors TSC are respectively composed of capacitor group C a1 ,...C an and another capacitor bank C b1 ,...C bn constitute, capacitor bank C a1 ,...C an Installed under the single-ph...

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Abstract

The invention discloses a power quality comprehensive compensation system of an electric railway and a control method thereof. The system comprises a railway static power controller RPC and two sets of thyristor switched capacitors TSC. The thyristor switched capacitors bear a large proportion of reactive power compensation, RPC performs active power compensation, harmonic suppression and a remained small proportion of reactive power compensation for two power supply arms, therefore, the capacity of RPC is effectively reduced, and negative sequence, harmonic and reactive comprehensive compensation are realized. The control method comprises a cooperative control policy of RPC and TSC, reference current detection based on reactive separation, a reactive power distribution method and an RPC control method. The power quality comprehensive compensation system of the electric railway greatly improves the power quality of the electric railway with low cost, and the corresponding control method effectively coordinates the operation of RPC and TSC and ensures that the system has good compensation performance and favorable application prospect.

Description

technical field [0001] The invention relates to an electrified railway power quality comprehensive compensation system and a control method thereof. Background technique [0002] The electric locomotive load in the electrified railway has the characteristics of nonlinearity, 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 supply quality of the power users around the railway. Therefore, effective control measures must be taken for power quality problems such as negative sequence, harmonics and reactive power of electrified railways. [0003] For the reactive power and harmonic problems of electrified railways, passive filters are generally used to filter specific order harmonics and provide reactive power compensation with fixed capacity. However, passive filters can only control harmonics of a specific order, and have the disadvantage of ...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01H02J3/26
CPCY02E40/50Y02E40/30Y02E40/40
Inventor 罗安吴传平王刚徐先勇马伏军孙娟张寅
Owner HUNAN UNIV
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