Device and method for automatically loading anti-islanding protection test system

Abstract

The invention provides a device and method for automatically loading an anti-islanding protection test system. The device comprises a data acquisition unit, a data processing unit and a RLC load adjusting unit, wherein the data acquisition unit, the data processing unit and the RLC load adjusting unit are sequentially connected. The RLC load adjusting unit respectively controls a load switch K1, a network side switch K2 and a combination switching switch of the RLC load adjusting unit through output signals. The corresponding automatic loading method is used for detecting the output power of a photovoltaic system on line and in real time, RLC loads are rapidly, automatically and accurately adjusted, resonance of three-phase independent alternating current electric equipment is generated, and the testing process is convenient to conduct, fast and accurate.

Description

technical field [0001] The invention relates to a loading device in the field of photovoltaic power generation systems, in particular to an automatic loading device for a grid-connected photovoltaic system anti-islanding protection test system and a method thereof. Background technique [0002] At present, in the field of photovoltaic power generation system testing, the main method used by the anti-islanding protection capability test device is: connect the anti-islanding protection capability test device to the outlet of the photovoltaic power station, and measure the current output active power and reactive power of the photovoltaic power station through a power test instrument. Power, the tester calculates the resistance, capacitance, and inductance capacity that the detection device needs to input according to the output power of the photovoltaic power plant under test and related parameters, and then manually adjusts the resistance, capacitance, and inductance load acco...

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Problems solved by technology

This detection method mainly has the following disadvantages: (1) The output power of the photovoltaic power station is affected by the irradiance, and the output power has random fluctuations. There is a certain error between the manual adjustment of the RLC load and the output power of the current photovoltaic system, especially in When the irradiance fluctuates greatly, the error is more obvious

(2) The manual switching of the RLC load has a delay and cannot track the output power of the photovoltaic power plant in real time, and the accuracy of the system test is low

(3) Manual switching of RLC loads, the process is cumbersome and the test cycle is prolonged

(4) It takes a long time to adjust the RLC load, and the test efficiency is low, which brings a certain instantaneous

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