Overcurrent protection method for smart grid with distributed power access
A distributed power supply and smart grid technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problems of system voltage and frequency deviation, voltage fluctuation, flicker, etc. The effect of current protection
Active Publication Date: 2018-04-03
山东新帅克能源科技有限公司
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Problems solved by technology
At the same time, after the distributed power supply is connected to the network, it may cause problems such as system voltage and frequency deviation, voltage fluctuation and flicker, which will affect the power quality of the system.
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[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0034] like figure 1 As shown, the circuit principle diagram of the smart grid containing distributed power access of the present invention is given, figure 2 The equivalent circuit diagram of the smart grid with distributed power access when the point F in the line L2 fails is given, combined with figure 1 and figure 2 The overcurrent protection method of the smart grid containing distributed power access of the present invention is given, which is realized by the following steps:
[0035] a). Circuit simplification and parameter setting. The circuit system is provided with lines L1, L2 and L3 in sequence. The distributed power supply DG is connected between L1 and L2. The equivalent electromotive force and impedance of the circuit system are E S ,Z S , the equivalent electromotive force and impedance of the distributed power supply DG are E DG ...
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The invention discloses an over-current protection method of a smart power grid containing distributed power connection. The over-current protection method includes the following steps that a, circuit simplification and parameter setting are performed; b, a setting value of a section I of a protector 1 is calculated; c, the fault resistance of a circuit L2 is calculated; d, EDG and ZDG are gained; e, short-circuit currents flowing through the protector 1 are gained; f, a setting value of a section II of the protector 1 is gained; g, a setting value of a section I of a protector 2 is gained, and over-current protection is achieved according to the gained setting value of the section I of the protector 1, the gained setting value of the section II of the protector 1 and the gained setting value of the section I of the protector 2. Shunting of a distributed power DG and action of the distributed power DG serving as a power supply are considered, the setting value of the section I of the protector 1, the setting value of the section II of the protector 1 and the setting value of the section I of the protector 2 are calculated again, and therefore over-current protection is effectively achieved for the smart power grid.
Description
technical field [0001] The present invention relates to an overcurrent protection method, and more specifically, relates to an overcurrent protection method for a smart grid connected to a distributed power supply. Background technique [0002] my country attaches great importance to the construction of smart grid. State Grid has announced the development plan of "smart grid", and formulated the strategic goal of "smart grid" in my country, that is, to develop and build a strong smart grid. The so-called smart grid refers to a new type of grid that uses advanced technology to improve the performance of the power system in terms of energy conversion efficiency, power utilization, power supply quality, and reliability. It is based on an integrated, high-speed two-way communication network. Through advanced The application of sensing and measurement technology, advanced equipment technology, advanced control method and advanced decision support system technology realizes the r...
Claims
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IPC IPC(8): H02H7/26H02H3/00
CPCH02H3/006H02H7/26
Inventor 张纪同李玉恒安百盈
Owner 山东新帅克能源科技有限公司