Active frequency drift island detection method and equipment
An active frequency offset and islanding detection technology, applied in the field of electric power industry, can solve problems such as damage to power maintenance personnel or power equipment, disconnection of connection ports, etc., to achieve fast detection speed, ensure detection time, and improve the effect of interference waveforms
Inactive Publication Date: 2020-11-27
STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology
However, when the distributed power supply system is connected to the surrounding loads for grid-connected operation, there are certain risks. One of them is that the connection port between the distributed system and the main network is disconnected due to an emergency, and the distributed The power generation system does not detect this phenomenon in time, but continues to supply power to local users. This mode of operation is called islanding operation
This unplanned island operation will cause great harm to power maintenance personnel or power equipment
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[0053] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the relationship between hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are implemented by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.
[0054] The block diagrams shown in the drawings are merely functional entities and do not necessarily have to correspond to physically sepa...
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The invention provides an active frequency drift island detection method and equipment. The method comprises the steps of obtaining an input current signal, and transmitting a disturbance signal to apreset period of the input current signal; sending a feedback signal transmitted by a phase-locked loop to a logic AND module; sending the input signal and the feedback signal to an AFD algorithm module by the logic AND module sends, processing the signals by the AFD algorithm module, and transmitting the signals to an active frequency drift island detection module for detection processing; and outputting and displaying a detection result. According to the method, the interference waveform of the AFD method is improved from the aspect of reducing the detection time and harmonic distortion. Anisland detection simulation model is established in a Matlab / Simulink environment by adopting a detection scheme of an improved active frequency drift method. On the premise of ensuring the detectiontime, the scheme can effectively reduce the detection blind area and harmonic distortion, and has obvious advantages.
Description
technical field [0001] The invention relates to the technical field of electric power industry, in particular to an active frequency offset islanding detection method and equipment. Background technique [0002] At present, in the world, due to the technological progress of the power industry and the gradual depletion of earth resources, as well as the aggravation of environmental pollution and the rapid growth of people's demand for electricity, people are paying more and more attention to the research of renewable energy. Distributed power generation technology has attracted widespread attention from all over the world due to its environmental protection, economy, and flexibility, and has become a hot spot in power technology research and development. [0003] Among distributed power generation technologies, wind power and photovoltaic power generation are generally considered to be the most important power sources, and the research and development of power supply technolo...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 王政魏延彬王东华李秀红焦平洋闫凯张培杰王睿曹昊王衍梁孟喆王烁尘隋明阳李岩刘志伟
Owner STATE GRID SHANDONG ELECTRIC POWER