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Wind, photovoltaic and storage-integrated micro-grid capable of being operated in a grid-connected manner

A micro-grid, wind-solar storage technology, applied in wind power generation, photovoltaic power generation, AC network circuits, etc., can solve problems such as unfavorable system voltage stability and difficulty in power grid operation.

Active Publication Date: 2015-06-24
STATE GRID CORP OF CHINA +3
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Problems solved by technology

At the same time, since the wind turbine is an asynchronous machine, if it is not controlled, it needs to absorb a certain amount of reactive power while generating active power, and does not use the voltage stability of the system
When the wind power penetration rate is low, these effects are not obvious. With the increase of the wind power penetration rate, the impact of wind energy on the power system gradually increases. difficulty

Method used

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  • Wind, photovoltaic and storage-integrated micro-grid capable of being operated in a grid-connected manner
  • Wind, photovoltaic and storage-integrated micro-grid capable of being operated in a grid-connected manner
  • Wind, photovoltaic and storage-integrated micro-grid capable of being operated in a grid-connected manner

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Embodiment Construction

[0048] figure 1 It shows a wind-solar-storage integrated microgrid 10 of the present invention that can be operated in parallel with the grid. The microgrid 10 includes: wind power generation equipment 14, photovoltaic power generation equipment 12, energy storage system 13, SVG equipment 18, DC bus, AC / DC bidirectional converter module 1 16 for connecting and isolating the DC bus with the large power grid 20, AC / DC bidirectional converter module 2 15 for connecting photovoltaic power generation equipment 12 and DC bus, load 17 and monitoring in the microgrid device 11.

[0049] see figure 1 , the energy storage system 13 includes a battery module 131 and a bidirectional DC / DC converter 132 connected to the above-mentioned DC bus.

[0050] The monitoring device 11 includes: a photovoltaic power generation equipment monitoring module 114, used for real-time monitoring of the photovoltaic power generation equipment 12 in the battery energy storage system 10, and predicting the...

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Abstract

A wind, photovoltaic and storage-integrated micro-grid capable of being operated in a grid-connected manner has the advantages that the micro-grid can predict the power generation power of wind-photovoltaic power generation equipment in the micro-grid and the load change in the micro-grid, track grid connection point voltage information of large power grids, acquire large power grid scheduling instructions in real time, detect storage battery module battery capacity in real time, set energy accumulation system discharge intervals, perform optimized management on the energy of an energy accumulation system on the basis of an SOC hierarchical control strategy, correct the charging and discharging power of the energy accumulation system in real time, optimize the working performance of the energy accumulation system, make and implement most appropriate control strategies, guarantee that a power generation system participates in large power grid voltage adjusting according to the requirements of the large power grids during grid connection, and guarantee voltage stability during grid-connected operation.

Description

Technical field [0001] The invention relates to a wind-solar-storage-integrated micro-grid capable of grid-connected operation. Background technique [0002] The energy and environmental crisis has become an important issue affecting the sustainable development of human beings, and the utilization of clean and renewable energy is the fundamental way to solve this problem. With the maturity of wind power generation, photovoltaic power generation, wave power generation and other renewable energy power generation technologies, more and more renewable energy microgrids are connected to the power grid in a distributed manner to meet people's daily production and living electricity needs. [0003] As a supplement to the ultra-high voltage, long-distance, and large-grid power supply mode, the micro-grid based on wind power and photovoltaic power generation represents a new development direction of the power system. The driving force of wind turbines is wind energy. Due to the inte...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/32H02J3/383H02J3/386Y02E10/56Y02E10/76Y02P80/14
Inventor 许驰
Owner STATE GRID CORP OF CHINA
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