A method and system for improving microgrid operation reliability

A micro-grid and reliability technology, applied in the direction of climate sustainability, photovoltaic power generation, wind power generation, etc., can solve the problems of harsh working conditions, high maintenance costs, large space occupation, etc., to ensure stable establishment and long service life , space saving effect

CN105515019BActive Publication Date: 2018-03-09DUNSHI MAGNETIC ENERGY TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-03-09

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Abstract

The invention relates to a method and a system for increasing micro-grid operation reliability, which belong to the technical field of micro-grid power supply. The technical solution is as follows: after being connected in series with a photovoltaic inverter (2), a photovoltaic array (1) is connected with a micro-grid alternating-current bus (9), and after being connected in series with a wind turbine converter (4), a wind turbine generator (3) is connected with the micro-grid alternating-current bus (9); after being connected in series with a first energy storage converter (6), a storage battery pack (5) is connected with the micro-grid alternating-current bus (9), and after being connected in series with a second energy storage converter (8), a flywheel energy storage system (7) is connected with the micro-grid alternating-current bus (9); the micro-grid alternating-current bus (9) is connected with a micro-grid load (11). The invention has the following beneficial effects: the method and the system not only can carry out good smooth control to maintain the stability of micro-grid voltage frequency when the randomly fluctuating power of the output side of a distributed power supply fluctuates, but also can provide instantaneous power support in the process that a micro-grid is switched from grid connection to grid disconnection, thus realizing the smooth transition of the micro-grid from grid connection to grid disconnection and uninterrupted power supply for the micro-grid load.
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Description

technical field

[0001] The invention relates to a method and system for improving the operation reliability of a microgrid, belonging to the technical field of microgrid power supply. Background technique

[0002] At present, the micro-grid system composed of distributed power sources such as wind energy and solar energy and energy storage devices is developing rapidly. However, wind energy and solar energy are seriously affected by natural factors, and they will appear random, volatile, and intermittent. The instantaneous power fluctuation is large, and the large power fluctuation will lead to the fluctuation of the voltage and power of the microgrid, and the power quality is poor, which will affect the normal operation of important loads. At present, the country welcomes, supports and serves distributed photovoltaic power generation. When a large number of distributed power sources are connected to the micro-grid system, the resulting voltage and power fluctuations are mor...

Examples

specific Embodiment approach

[0037] Refer to attached figure 1 The photovoltaic power generation system composed of photovoltaic array 1 and photovoltaic inverter 2 and the wind power generation system composed of wind turbine 3 and wind turbine converter 4 together constitute the distributed power supply inside the microgrid system, which is responsible for providing electric energy to the microgrid. The battery pack 5 cooperates with its energy storage converter-6. On the one hand, it is responsible for providing or absorbing power when the distributed power source fluctuates for a long time, such as continuous cloudy or strong sunlight, to achieve balance with the load power; on the other hand Responsible for providing voltage and frequency support to the microgrid system as the main power supply during the grid-connected to off-grid switching process. The flywheel energy storage system 7 cooperates with the energy storage converter 2 8, and has the following two functions: on the one hand, it is respo...