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A Multilevel Railway Power Regulator and Its Passive Nonlinear Control Method

A power conditioner, passive control technology, applied in the output power conversion device, reducing/preventing power oscillation, converting AC power input to AC power output, etc. question

Inactive Publication Date: 2017-05-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in fact, since the cascaded RPC is a nonlinear and multivariable system, it is difficult to obtain a good dynamic effect by using the traditional linear control method, and it is difficult to achieve precise control

Method used

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  • A Multilevel Railway Power Regulator and Its Passive Nonlinear Control Method
  • A Multilevel Railway Power Regulator and Its Passive Nonlinear Control Method
  • A Multilevel Railway Power Regulator and Its Passive Nonlinear Control Method

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Embodiment Construction

[0044] like figure 1 As shown, the MMC type direct railway power conditioner of an embodiment of the present invention is made up of four sides; Each side is made up of an H-bridge chain and a filter inductor; The H-bridge chain is formed by the cascade connection of a plurality of H-bridge units; The four points of intersection are divided into two groups according to the diagonal, and the two groups of points of intersection are respectively connected to the two traction power supply arms through the isolation transformer. The device uses multi-level cascaded converters to form a quadrilateral single-phase AC-AC converter, without a DC link in the middle, and can directly realize bidirectional conversion and flow of power, and at the same time can compensate the reactive power generated by the locomotive load of the traction power supply arm . Therefore, the device saves two bulky step-down transformers by adopting the multi-level cascade conversion technology, and only nee...

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Abstract

The invention discloses a non-linear passive control method for a multi-level railway power regulator. The power regulator is composed of a modularized, multi-level cascaded H-bridge and four filter inductors, which can be output from a Scott transformer. Terminals are connected directly, eliminating the need for an isolation transformer. This structure can be used in medium and high voltage occasions, especially for railway traction systems. A nonlinear control based on passive theory is adopted, which can perform fast current tracking control, maintain the stability and balance of the DC side voltage, and effectively improve the control performance of the system. The compensator can realize bidirectional conversion and flow of power, effectively reduce the negative sequence and harmonic components in the grid current, thereby improving the running performance of the locomotive and reducing the impact on the grid is of great significance.

Description

technical field [0001] The invention relates to the field of power quality control of railway traction systems, in particular to an MRPC type direct railway power compensator and a control method thereof. Background technique [0002] Electrified railways are playing an increasingly important role in the development of modern society, and high-speed railways will surely be the main direction of future railway development. Railway traction system equipment works in medium and high voltage applications. Due to the limitation of the capacity of power electronic semiconductor devices, thyristor semi-controlled devices are mostly used; thyristors are phase-controlled devices, and a large number of semi-controlled devices connected to the power grid will bring harmonic pollution to the power grid. The power factor of the power supply system is reduced, and the utilization rate of electric energy is low. In recent years, with the further development and expansion of the high-speed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02M5/293
CPCH02J3/24H02M5/293H02M5/2932
Inventor 马伏军闵俊徐千鸣何志兴丁红旗
Owner HUNAN UNIV
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