Offline operation control method suitable for user-side microgrid

An off-grid operation and control method technology, applied in the field of power grid, can solve the problems of difficulty in large-scale popularization and application, less research on off-grid operation, and high requirements for controller coordination, so as to ensure power quality, efficient and reliable coordinated control, and avoid frequent effect of action

Active Publication Date: 2015-10-21
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

After searching the existing technical literature, it was found that (a microgrid system and energy control method for grid-connected and off-grid operation, Chinese Patent No.: 201310618109.7) proposed a control method for off-grid operation, which passed detection The SOC (State of Charge, state of charge) of the battery controls the supercapacitor to correct the charge and discharge state of

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  • Offline operation control method suitable for user-side microgrid
  • Offline operation control method suitable for user-side microgrid
  • Offline operation control method suitable for user-side microgrid

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[0035] The present invention will be further described in detail below in conjunction with the embodiments and the drawings.

[0036] figure 1 It is the main process of the off-grid operation control method suitable for the user-side microgrid, let ΔP=∑P pv +∑P bat -∑P loss -∑P load That is, the sum of the output of the photovoltaic power generation system and the energy storage minus the load power and the active power loss of the user-side microgrid, and enters the process of inputting load, reducing output and increasing output by judging the size of ΔP, and setting parameters reasonably to achieve multiple off-grid operations The "hysteresis control" of power supply coordination avoids frequent actions of the control system. When the energy storage system, photovoltaic power generation system, and load regulation cannot guarantee the internal power balance of the microgrid, so that the voltage or frequency is abnormal, enter the voltage stability control or frequency stabi...

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Abstract

The invention discloses an offline operation control method suitable for a user-side microgrid. Research is carried out on an offline operation mode in the microgrid, a microgrid coordination control strategy of a layered structure is employed, the layered structure comprises a local control layer and a centralized control layer, and the method is applied to coordination control between multiple power sources and loads under multiple operation conditions. According to the invention, under the condition that the quality of electric energy is guaranteed, by full use of the generating advantages of various micro power sources, the micro power sources of multiple types in the user side microgrid can be coordinated and controlled efficiently and reliably so that the requirements of the mcirogrid for energy balance and output are met. The method is simple and practical, the voltage and the frequency inside the microgrid are enabled to be stable, safe operation of important loads is guaranteed, at the same time, the output of a photovoltaic power generation system is fully utilized, and the utilization rate of regenerative energy is improved.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method for controlling off-grid operation of a microgrid. Background technique [0002] With the gradual depletion of fossil energy and the increasing environmental pollution, the development and utilization of clean energy and renewable energy has become an inevitable choice. Renewable energy such as solar energy and wind energy has been rapidly developed and widely used in the world. At the same time, with the rapid development of industrial civilization, the demand for electricity is increasing day by day, and the scale of traditional power grids continues to expand. Ultra-high voltage and long-distance centralized power transmission methods are facing more and more challenges. Based on the above background, Distributed Generation (Distributed Power Generation) Generation, DG) technology has been widely concerned and valued by researchers at home and abroad. The develop...

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCY02E10/56
Inventor 杨苹许志荣尹旭宋嗣博
Owner SOUTH CHINA UNIV OF TECH
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