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Control method for diesel and stored energy coordination of intelligent micro-grid

A control method and micro-grid technology, applied in the direction of electrical components, circuit devices, emergency power supply arrangements, etc., to achieve the effect of improving the utilization rate of new energy, operating economy, and improving safety and stability

Active Publication Date: 2013-02-06
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

[0008] In order to solve the problem of steady-state control of the microgrid in the prior art, the present invention proposes a control method for smart microgrid diesel-storage coordination, which solves the problems of energy storage function positioning and diesel-storage control strategy and improves the utilization rate and economical efficiency of new energy in the microgrid. sex

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  • Control method for diesel and stored energy coordination of intelligent micro-grid
  • Control method for diesel and stored energy coordination of intelligent micro-grid
  • Control method for diesel and stored energy coordination of intelligent micro-grid

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specific Embodiment approach

[0027] figure 2 It is the control process of the non-switching mode of diesel storage, which is mainly divided into two stages, one is the energy storage charging stage, and the other is the energy storage discharging stage, according to figure 2 , the specific implementation method is as follows when the diesel storage does not switch mode:

[0028] The first step is to judge the net load and the minimum output of the diesel engine (ie P 30%柴发 ), if the net load is greater than the minimum output of the diesel engine, it indicates that the load is relatively large. It is only necessary to control the output power of the diesel engine to be equal to the size of the net load, and the charging power of the energy storage is zero. In the actual operation process, the diesel engine has a constant frequency Constant voltage control feature, the power will be automatically balanced. If it is judged that the net load is less than the minimum output of the diesel engine, it indica...

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Abstract

The invention belongs to the technical field of an intelligent micro-grid for an electric power system, and relates to a control method for diesel and stored energy coordination of the intelligent micro-grid. Diesel and stored energy coordination is controlled in two modes. In the first mode, diesel and stored energy do not switch with each other, a diesel power generator serves as a main power supply of the system, and the stored energy functions in a PQ manner. In the second mode, the diesel and the stored energy switch, the stored energy functions in the PQ manner when the diesel power generator serves as the main power supply; when the stored energy charges to be the upper limit of SOC(super capacitor state of charge), the main power supply is switched from the diesel power generator into a stored energy system, then the stored energy functions in a VF manner; and when the stored energy discharges to be the lower limit of the SOC, the main power supply is switched into the diesel power generator from the stored energy system. By the control method, problems about steady-state control of the micro-grid are solved, new-energy utilization rate and running economic effect can be improved effectively, and safety and stability of the micro-grid in running are improved.

Description

technical field [0001] The invention belongs to the technical field of smart micro-grids in power systems, and in particular relates to a control method for diesel-storage coordination in smart micro-grids. Background technique [0002] As smart grid technology continues to gain popularity, distributed power supply technology and micro-grid technology have developed rapidly, and micro-grid has therefore become an important supplement and part of the distribution network and plays an important role in user terminals. The so-called micro-grid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices. Managed autonomous systems. Microgrids are usually composed of distributed power generation (wind, solar, diesel generators, gas turbines, etc.) Due to the high price, the energy storage system usually has limited installed capacity, and it ...

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Application Information

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IPC IPC(8): H02J9/08
Inventor 王科陈柔伊雷金勇陆志刚董旭柱段卫国金小明张乐平付超史丹
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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