Method for simultaneously realizing low-voltage ride through and island detection

A low-voltage ride-through and island detection technology, applied in the direction of fault location, single-network parallel feeding arrangement, etc., can solve the problems of detection blind spots and long detection time, achieve good real-time performance, improve detection time, and achieve simple effects

Active Publication Date: 2016-01-27
XUJI GRP +2
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Problems solved by technology

[0005] The purpose of the present invention is to provide a power disturbance method suitable for low-voltage ride-through and islanding detection in power generation systems, so as to solve the problem of detection blind spots and relatively short detection time when passive detection methods are used to realize low-voltage ride-through and islanding detection in the prior art. long question

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  • Method for simultaneously realizing low-voltage ride through and island detection
  • Method for simultaneously realizing low-voltage ride through and island detection
  • Method for simultaneously realizing low-voltage ride through and island detection

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Embodiment Construction

[0027] The present invention will be described in further detail below with reference to the accompanying drawings.

[0028] as attached figure 1 Shown is the flow chart of low voltage ride-through and islanding detection. First, the phase voltages on the outlet side of the system are sampled. Then the three-phase phase-locked loop calculates the instantaneous amplitude and instantaneous frequency of the voltage at the outlet side of the system according to the sampled value. The process of calculating the instantaneous amplitude and instantaneous frequency of the output side voltage of the power generation system through the three-phase phase-locked loop is as follows:

[0029] like figure 2 As shown, it is a positive and negative sequence decoupling phase-locked loop circuit. The phase-locked loop (DSOGI-PLL) based on the biquad-order generalized integrator detects the grid voltage, and after the three-phase voltage is abc / αβ transformed, the αβ component of grid voltag...

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Abstract

The invention relates to a method for simultaneously realizing low-voltage ride through and island detection. The method comprises the following steps in order: step one, sampling a network voltage at the outlet of a generation system to acquire an instant amplitude and instant frequency information of the network voltage; step two, determining whether the generation system is in a normal state; step three, judging that the generation system is in an abnormal state in the step two, the generation system emitting a certain amount of reactive current according to the voltage drop range of the network instant voltage so as to realize the low-voltage ride through; step four, disturbing the generation system through the reactive current produced in the step three so as to further determine whether the system is in an island state, if so, halting the system; step five, repeating above steps, guaranteeing the low-voltage ride through and the island detection when the electric network is in fault. Through the adoption of the detection method provided by the invention, the low-voltage ride through and the island detection can be simultaneously finished through a simple efficiency disturbance method, the method is good in real-time, and the structure based on the method is simple to realize.

Description

technical field [0001] The invention belongs to the field of new energy distributed power generation, and in particular relates to a power disturbance method suitable for low voltage ride-through and islanding detection of a distributed power generation system. Background technique [0002] With the improvement of new energy grid-connected power generation technology and the increasing environmental problems, the number of new energy grid-connected power generation systems has grown rapidly. In order to ensure the safety of the power grid, countries around the world have formulated many strict grid-connection rules, and low voltage ride-through (LVRT) and islanding detection are two of the main aspects. Low voltage ride-through means that when the voltage of the new energy power generation system grid connection point drops, the new energy power generation system can remain connected to the grid and provide a certain amount of reactive power to the grid to support grid recov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G01R31/08
Inventor 李献伟高峰赵成功马聪谢卫华毋炳鑫王毅翟登辉
Owner XUJI GRP
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