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Establishment method of microgrid frequency, active power and time three-variable coordinate system

A technology of micro-grid and coordinate system, applied in the field of micro-grid management, to reduce the complexity of operation, improve the rational distribution of power generation equipment output, and meet the development requirements

Inactive Publication Date: 2017-03-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Claims
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  • Establishment method of microgrid frequency, active power and time three-variable coordinate system
  • Establishment method of microgrid frequency, active power and time three-variable coordinate system

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Embodiment Construction

[0020] According to Article 35 of the "Power Supply Business Rules", the allowable deviation of the frequency under normal operation of the power system is: plus or minus 0.2Hz for those with an installed capacity above 300kW; for those with an installed capacity below 300kW: 0.5Hz; when the power system is under abnormal conditions, the allowable deviation of power supply shall not exceed 1.0 Hz. Generally, the installed capacity of micro-grid is small, basically below 300kW, so the allowable frequency fluctuation is 0.5 Hz. Then the lowest lower limit of the frequency is set at 49.5 Hz, and the highest upper limit is 50.5 Hz.

[0021] If the frequency fluctuates greatly, it will have adverse effects on users, power plants, and power systems.

[0022] 1. Impact on users: The change of frequency will cause the change of motor speed, which will affect the product quality. Radar, electronic computer, etc. will not be able to operate due to the low frequency;

[0023] 2. I...

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Abstract

The invention relates to a method for building a three-variable (frequency, active power and time) coordinate system for a miniature power grid. The active power emitted by the miniature power grid serves as abscissa, and two lines perpendicular to the abscissa are made and respectively serve as an upper limit value and a lower limit value of the active power. The frequency of the miniature power grid serves as ordinate, and two lines perpendicular to the ordinate are made and respectively serve as an upper limit value and a lower limit value of the frequency. Four lines enables the coordinate system to be divided into nine regions, and time serves as vertical coordinate. Moreover, adjustment measures for entering into each region are set. The method improves the stability of frequency to maximum degree, and enables the power output of power generation equipment to be distributed reasonably. The method meets the requirements for active power management of the power grid, and meets the demands for the safe operation of electrical equipment. Compared with the prior art, the method reduces the operation complexity, guarantees the qualified frequency, is more intelligent, and meets the development requirements of an intelligent power grid better.

Description

technical field [0001] The invention relates to a micro-grid management technology, in particular to a method for establishing a three-variable coordinate system of the micro-grid frequency, active power and time. Background technique [0002] Micro-grid (Micro-Grid), also translated as micro-grid, is a new type of network structure, which is a system unit composed of a group of micro-power sources, loads, energy storage systems and control devices. Microgrid is an autonomous system capable of self-control, protection and management, which can be connected to the external grid or run in isolation. Microgrid is a concept relative to the traditional large power grid. It refers to a network composed of multiple distributed power sources and their related loads according to a certain topology, and is connected to the conventional power grid through static switches. [0003] The development and extension of microgrids can fully promote the large-scale access of distributed power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
CPCY02P80/14
Inventor 程启明黄山褚思远张强杨小龙张海清
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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