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Negative sequence current compensation method and system for traction network single-phase load power supply

A negative-sequence current, single-phase load technology is applied in the field of negative-sequence current compensation and systems for single-phase load power supply in traction grids, and can solve problems such as capacity limitations of photovoltaic inverters and unfavorable operation of high-voltage grids. Achieve the effect of avoiding phase-locked loop and coordinate transformation problems, constant power, and improving power quality

Active Publication Date: 2022-06-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not consider the limitation of photovoltaic inverter capacity
[0003] The traction network is connected to the single-phase vehicle load. Due to the load asymmetry, the high-voltage power grid will generate negative sequence current, which is not conducive to the operation of the high-voltage power grid.

Method used

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  • Negative sequence current compensation method and system for traction network single-phase load power supply

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Embodiment 1

[0038] Negative sequence current compensation method for single-phase load power supply in traction network

[0039] like figure 1 As shown, the conversion between the high-voltage grid and the traction-side medium-voltage grid is realized through the first three-phase V / v transformer 1, and the conversion is the conversion between the three-phase high voltage and the two-phase medium voltage; through the second three-phase The V / v transformer 2 realizes the conversion between the traction side medium-voltage grid and the low-voltage grid, and the conversion is the conversion between two-phase medium-voltage and three-phase low-voltage; the low-voltage grid is connected to a plurality of photovoltaic power generation units 3, The negative sequence current of the high voltage grid is compensated by the photovoltaic power generation unit 3 .

[0040] Taking Y / Y transformer 6 as an example, according to the port voltage and port current transformation theory, it can be deduced t...

Embodiment 2

[0115] Negative sequence current compensation system for single-phase load power supply in traction network

[0116] like figure 1 As shown, a first three-phase V / v transformer 1 is connected between the high-voltage grid and the traction-side medium-voltage grid, and a second three-phase V / v transformer 2 is connected between the traction-side medium-voltage grid and the low-voltage grid; the low-voltage grid is connected to A plurality of photovoltaic power generation units 3 are inserted, and the photovoltaic power generation units 3 can compensate the negative sequence current of the high-voltage power grid.

[0117] like figure 1 , figure 2 As shown, the photovoltaic power generation unit includes a three-phase inverter 4, a current controller 5, a Y / Y transformer 6, and a photovoltaic module 7. The current controller 5 controls the current output of the three-phase inverter 4 to provide high-voltage power grids. Negative sequence current is compensated.

[0118] The...

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Abstract

The invention relates to a negative-sequence current compensation method and system for single-phase load power supply of a traction network, and the method comprises the steps: achieving the conversion between a high-voltage power grid and a traction-side medium-voltage power grid through a first three-phase V / v transformer, and achieving the conversion between a three-phase high voltage and a two-phase medium voltage; conversion between a traction side medium-voltage power grid and a low-voltage power grid is achieved through a second three-phase V / v transformer, and conversion is conversion between two-phase medium voltage and three-phase low voltage; the low-voltage power grid is connected with a plurality of photovoltaic power generation units, and the negative-sequence current of the high-voltage power grid is compensated through the photovoltaic power generation units. According to the invention, the power grid negative-sequence current generated by the single-phase locomotive load can be compensated so as to ensure the current balance of the high-voltage power grid.

Description

technical field [0001] The invention relates to a negative sequence current compensation method and system for power supply of a single-phase load of a traction network. Background technique [0002] The solution based on the dq rotating coordinate system is to map the three-phase instantaneous voltages in the abc coordinate system to the instantaneous voltages in the dq coordinate system, one of its advantages is to separate the zero-sequence components from the abc coordinate system to use less Variables are used to control different objectives, but this method has disadvantages such as complex structure and difficult to set control parameters, and is easily affected by input voltage fluctuations and output current changes. The solution based on the αβ static coordinate system is to transform the instantaneous values ​​of the phase voltage and line current in the abc static coordinate system into the αβ static coordinate system. This method improves the anti-interference a...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/48H02J3/38
CPCH02J3/26H02J3/48H02J3/381H02J2300/24Y02E40/50
Inventor 刘文泉程鹏贾利民
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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