Method for eliminating parallel dilution effect of multiple inverters and island detecting method

An island detection and inverter technology, applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve the problems that the disturbance cannot be synchronized, the detection effect is not obvious, etc., and achieve the effect of reducing misjudgment

Active Publication Date: 2019-10-22
YANGZHOU UNIV
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Problems solved by technology

Although some disturbance methods can effectively detect isolated islands under the condition of a single unit connected to the grid, in the case of multi-unit parallel connection, the mutual infl...

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  • Method for eliminating parallel dilution effect of multiple inverters and island detecting method
  • Method for eliminating parallel dilution effect of multiple inverters and island detecting method
  • Method for eliminating parallel dilution effect of multiple inverters and island detecting method

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with specific embodiments and principles.

[0027]In the case of not being separated from the large power grid, the inverter generally adopts the control method of unity power factor during grid-connected operation, that is, the current and voltage maintain the same phase; when islanding occurs, the total load at this time can be regarded as RLC parallel connection , while the voltage and current phase difference on the RLC load is determined by the impedance angle φ of the RLC load load Determined; when the RLC parameters are constant, the impedance angle is determined by the frequency, that is: when φ load When it is not 0, the current and voltage will not be in the same phase. Therefore, the inverter will adjust the control voltage in order to achieve a power factor of 1, and at this time the power factor is determined by φ load decision, and the inverter control voltage cannot change the power...

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Abstract

The invention discloses a method for eliminating a parallel dilution effect of multiple inverters and an island detecting method in the field of electrical equipment and electrical engineering. A timeof outputting a phase angle zero-crossing point of a phase-locked loop is used as a starting position of disturbance of multiple parallel inverters within each period to realize synchronous disturbance of multiple parallel inverters; after synchronous disturbance, directions of voltage frequency deviations of common points become consistent; voltages obtained by the parallel inverters are from common points at one same bus and after convergence of the phase-locked loop, the obtained disturbance phases are same. According to the invention, the island detecting method with phase disturbance isimproved to find out a phase-locked-loop-based island detecting method capable of realizing synchronous disturbance of multiple inverters and being easy to extract the disturbance amount, so that theisland detecting method is perfected.

Description

technical field [0001] The invention relates to a plurality of inverters connected in parallel, in particular to a method for eliminating the dilution effect of parallel connection of a plurality of inverters. Background technique [0002] With the increase of distributed power grid-connected capacity, the power supply system will cause some serious problems due to the interruption of power supply of the large power grid. Among them, the island effect is a problem that cannot be ignored. When the distributed generation system is in an island operation state, if it cannot be detected and removed in time, it will seriously threaten the personal safety of maintenance personnel, affect the power quality and even damage the power supply equipment. Therefore, the distributed generation system based on grid-connected inverters requires the islanding detection function. [0003] The current island detection technology is divided into three categories: local passive method, local ac...

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Application Information

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IPC IPC(8): G01R31/00G01R31/08H02J3/38
CPCG01R31/00G01R31/086G01R31/088H02J3/38H02J3/388
Inventor 史旺旺徐靖雨
Owner YANGZHOU UNIV
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