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Power stabilizing method and device for micro-grid system grid-connected node

A technology for adjusting power and nodes, which is applied in the direction of single-network parallel feeding arrangement, reducing/preventing power oscillation, sustainable manufacturing/processing, etc., can solve the problems of poor power stabilization effect, less frequency coverage, and low frequency, etc., to achieve Improve stability and reliability, prevent power grid impact, and improve the effect of power quality

Active Publication Date: 2015-03-04
EAST GRP CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no system-level power stabilization method for power fluctuations of grid-connected nodes, only based on the dispatched power P 0 Controlling the power of the grid-connected nodes of the microgrid system will have the effect of power stabilization. However, the main purpose of this control of the power of the grid-connected nodes is power control, not power fluctuation stabilization, and the frequency is low. slow
Therefore, the existing power stabilization method covers few frequencies, and the effect of power stabilization is relatively poor.

Method used

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Embodiment Construction

[0018] The invention will be described in detail below in conjunction with specific embodiments.

[0019] The first thing to explain is that the microgrid system is equipped with an intelligent gateway circuit breaker to collect the real-time power of the grid-connected nodes of the microgrid system.

[0020] The method for power stabilization of the grid-connected nodes of the microgrid system in this embodiment mainly includes the following three steps:

[0021] Low frequency smoothing step. When the microgrid system receives a new scheduling instruction from the large power grid system, it calculates the average power of the grid-connected nodes of the microgrid system in the previous 5 minutes according to the data collected by the smart gateway circuit breaker, and then uses the The average power and the scheduling power P in the new scheduling instruction 0 Make a difference to get the difference ΔP, the difference ΔP is used as the input of the PI regulator, and the o...

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Abstract

The invention discloses a power stabilizing method for a micro-grid system grid-connected node, and relates to the technical field of power control of the micro-grid system grid-connected nodes. According to the method, a functional module framework is built, a computer system is controlled by a computer program command, and the computer program command is stored in a readable storage medium of a computer. The method mainly includes a low-frequency stabilizing step, a medium-frequency stabilizing step and a power adjusting step. Power fluctuation of the grid-connected node is stabilized through a PI adjuster by a low-frequency stabilizing algorithm to obtain low-frequency adjusting overall power Pd, and a peak load shaving function is achieved. In the medium-frequency stabilizing step, medium-frequency adjusting overall power Pz is obtained by an improved secondary frequency modulation algorithm, the frequency of executing the medium-frequency stabilizing step is higher than that of executing the low-frequency stabilizing step, and the power of each inverter is adjusted according to the Pd and the Pz in the power adjusting step, so that power fluctuation of the grid-connected node is stabilized.

Description

technical field [0001] The invention relates to the technical field of power control of grid-connected nodes of a micro-grid system, and specifically relates to a method for power stabilization of grid-connected nodes of a micro-grid system. The method is completed by establishing a functional module framework and controlling a computer system by computer program instructions. These Computer program instructions are stored on a computer readable storage medium. Background technique [0002] Micro-grid system refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices and related loads. It is an autonomous system that can realize self-control, protection and management. , which can run in parallel with the large power grid or in isolation. The microgrid system is an important part of the smart grid. [0003] When the micro-grid system and the large power grid are connected to the grid, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCY02P80/14H02J3/24H02J3/46
Inventor 郭蕾施永苏建徽徐海波
Owner EAST GRP CO LTD
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