Synchronous time service remote communication island detection method and system
A technology of island detection and remote communication, which is applied in the field of microgrid, can solve problems such as power quality influence and inverter system instability, and achieve the effects of eliminating interference, decoupling influence, and reducing complexity
Inactive Publication Date: 2016-08-17
WUHAN UNIV OF TECH
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Passive island detection has a large detection blind area, so it is generally combined with active island detection to narrow the detection blind area. The active island detection method is carried out by periodically disturbing the output current of the grid-connected inverter. The quality is affected and will cause the inverter system to be unstable
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[0022] The present invention will be further described below in conjunction with specific examples.
[0023] figure 1 It is a structural block diagram of an embodiment of the present invention, which includes a central controller, which obtains a second pulse signal synchronized with the international standard time through satellite timing, and the central controller passes through a zero-crossing detection circuit (such as figure 2 shown) to collect the voltage and frequency signal of the public connection point between the large grid and the microgrid, the central controller collects the output voltage and frequency of the power station through the remote communication network, and the central controller communicates with the grid-connected inverter control unit and the grid-connected inverter control unit through the microgrid management network Microgrid energy storage unit communication. The satellite time service can adopt multiple methods such as the American satellit...
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The invention provides a synchronous time service remote communication type island detection system which comprises a central controller. The central controller obtains a per-second pulse signal synchronous with the international standard time through satellite time service, acquires voltage frequency signals of public connecting points between a large power grid and a micro-power grid, acquires voltage frequency output by a power station through a remote communication network and is communicated with a grid-connected inverter control unit and a micro-power grid energy storage unit through a micro-power grid management network. Different from other active island detection methods, periodic disturbance is not required to be kept constantly, disturbance is exerted only under the condition of a suspected island, and accordingly the synchronous time service remote communication type island detection system has small influence on the electric energy quality.
Description
technical field [0001] The invention belongs to the technical field of micro-grids, and in particular relates to a synchronous time service remote communication island detection method and system. Background technique [0002] China is currently facing serious dual pressures on energy supply and greenhouse gas emissions. China must complete energy transformation in the next 20 to 30 years, and the development of renewable energy is the only way out for the sustainable development of China's energy and environment. [0003] Traditional islanding detection technologies are divided into passive islanding detection and active islanding detection. Common passive islanding detection methods include: detecting whether the amplitude, frequency or phase of the common point voltage exceeds the normal range; detecting whether the harmonic change of the common point exceeds the normal range. Passive island detection has a large detection blind area, so it is generally combined with ac...
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IPC IPC(8): G01R31/00
Inventor 刘芙蓉朱思瑞曹前陈伟朱国荣张东华黄建煌徐冰溶朱科俊范敏毅周小龙
Owner WUHAN UNIV OF TECH