Traction power supply system photovoltaic energy storage grid connecting device and control method thereof

A traction power supply system, photovoltaic energy storage technology, applied in the direction of circuit devices, photovoltaic power generation, electrical components, etc., can solve the problem of failure to meet the requirements of power quality, the inability to realize reactive power and negative sequence comprehensive compensation of traction power supply system, traction power supply system Instability and other problems, to achieve the effect of stabilizing output power, relieving operating pressure, and improving economy

Active Publication Date: 2017-05-31
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0007] However, the power converter in the existing photovoltaic traction power supply system cannot realize the reactive power and negative sequence comprehensive compensation of the traction power supply system; Requirements for power quality when connected to the grid through the

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  • Traction power supply system photovoltaic energy storage grid connecting device and control method thereof
  • Traction power supply system photovoltaic energy storage grid connecting device and control method thereof
  • Traction power supply system photovoltaic energy storage grid connecting device and control method thereof

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Embodiment Construction

[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described with reference to the accompanying drawings.

[0037] In this embodiment, see figure 1 As shown, the present invention proposes a photovoltaic energy storage grid-connected device for a traction power supply system, including a photovoltaic array 16, a photovoltaic system DC / DC converter 17, an energy storage device 19, an energy storage system bidirectional DC / DC converter 18, and a direct current Support capacitor 15, single-phase four-quadrant converter Ⅰ13, single-phase four-quadrant converter Ⅱ14, single-phase transformer Ⅰ11 and single-phase transformer Ⅱ12;

[0038] One end of the primary side of the single-phase transformer Ⅰ11 and single-phase transformer Ⅱ12 is connected to the busbars 23 and 24 of the two power supply arms of the traction power supply system, and the single-phase transformer Ⅰ11 and single-phase tran...

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Abstract

The invention discloses a traction power supply system photovoltaic energy storage grid connecting device and a control method thereof. The method comprises detecting in real time the bus voltage and the feeder current of two power supply arms, the output power of a photovoltaic system and the charging and discharging power of an energy storage system to dynamically distribute the charging and discharging power set value of the energy storage system; computing the current set values of two four-quadrant converters to equate the internal feeder current of the two power supply arms with the sum of the phase quantity of the current of the four-quadrant converters as well as the phase of synthesized current with the voltage phase of a power system; controlling the charging and discharging power of the energy storage system to follow the set value, control the current of the two four-quadrant converter to follow the set values. Therefore, grid connection of the photovoltaic system and the energy storage system can be achieved, and meanwhile, the aim of reactive negative-sequence comprehensive compensation of a traction power supply system can be achieved.

Description

Technical field [0001] The invention belongs to the technical field of traction power supply, and particularly relates to a photovoltaic energy storage grid-connected device and a control method of a traction power supply system. Background technique [0002] As of 2015, my country’s railway operating mileage is 121,000 kilometers. By 2020, the railway network will reach 150,000 kilometers, and the industry’s annual electricity consumption will reach 40 billion kWh, which is equivalent to consuming 16 billion kilograms of standard coal each year and carbon dioxide emissions. About 40 billion kilograms, sulfur dioxide emissions are about 1.2 billion kilograms, and nitrogen oxides emissions are about 600 million kilograms; of which, more than 60% of power consumption and pollutant emissions are caused by the railway traction power supply system. [0003] Air pollution and energy security issues caused by the energy consumption structure dominated by fossil energy such as coal have wid...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/385H02J3/32Y02E70/30Y02E10/56
Inventor 戴朝华邬明亮陈维荣赵化博邓文丽高岩
Owner SOUTHWEST JIAOTONG UNIV
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