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A wind-storage bipolar DC microgrid based on a three-level DC-DC converter and its control method

A DC microgrid, DC-DC technology, applied in the direction of collectors, battery circuit devices, AC network load balancing, etc., can solve the problems of low operation efficiency of unipolar DC grids, improve life, reduce busbar-to-ground, etc. voltage, the effect of reducing complexity

Active Publication Date: 2019-09-13
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In order to solve the problem of low operating efficiency of the existing unipolar DC power grid system, the present invention reduces the voltage of the DC microgrid bus to ground, and at the same time meets the requirements of various converters and loads for different voltage levels, making the system safer and more reliable, providing A wind-storage bipolar DC microgrid based on a three-level DC-DC converter and its control method

Method used

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  • A wind-storage bipolar DC microgrid based on a three-level DC-DC converter and its control method
  • A wind-storage bipolar DC microgrid based on a three-level DC-DC converter and its control method
  • A wind-storage bipolar DC microgrid based on a three-level DC-DC converter and its control method

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Embodiment Construction

[0029] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0030] A wind-storage bipolar DC microgrid based on a three-level DC-DC converter, such as figure 1 As shown, it includes wind power unit, energy storage unit, load unit and bipolar DC bus. wind power units, such as figure 2 As shown, it includes wind turbines and wind turbine converters; wind turbines are composed of wind turbines and permanent magnet synchronous generators; wind turbine converters include diode rectifiers and three-level Boost converters; wind turbines are connected to bipolar converters through three-level Boost converters permanent DC bus connection. energy storage unit, such as image 3 As shown, it includes a supercapacitor and a three-level bidirectional DC-DC converter; the supercapacitor is connected to a bipolar DC bus through a three-level bidirectional DC-DC converter. The load unit includes a three-phase DC-AC inverter...

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Abstract

The invention discloses a three-level DC-DC converter-based wind storage bipolar DC microgrid and a control method thereof. The DC microgrid comprises a wind power unit, an energy storage unit, a load unit and a bipolar DC bus. According to an interval-division running method for a bus voltage of the three-level DC-DC converter-based wind storage bipolar DC microgrid, smooth switching among intervals can be achieved by matching wind power characteristic control of the wind power unit, limited power control based on droop characteristic, charge-discharge separation control of the energy unit and load reduction control of the load unit, the bus voltage is adjusted, the system power is balanced, and stable running of the wind storage bipolar DC microgrid is ensured. With the adoption of the bipolar DC microgrid structure, the bus voltage to the ground can be reduced, the system running efficiency is improved, and the requirements of different converters and loads on each voltage class can be met.

Description

technical field [0001] The invention relates to the field of DC microgrid wind power energy storage, in particular to a wind storage bipolar DC microgrid based on a three-level DC-DC converter and a control method thereof, which is suitable for the control of the bipolar DC microgrid. Background technique [0002] In recent years, the country has vigorously implemented the development strategy of the global energy Internet to promote clean energy and green methods to meet power demand. DC microgrids, as a new form of energy grid, have become a research hotspot. Integrating new energy generation units such as wind power and photovoltaics, energy storage units and local loads with DC microgrids can reduce damage to the environment and achieve efficient use of renewable energy, which has attracted widespread attention at home and abroad. [0003] At present, most of the research on DC microgrid focuses on the unipolar DC microgrid structure, that is, the distributed power suppl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/32H02J7/34
CPCH02J3/32H02J3/386H02J7/345Y02E10/76
Inventor 韩肖清王磊陈宇豪杨宇张佰富王祺
Owner TAIYUAN UNIV OF TECH
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