Power grid oscillation starting device and oscillation starting control method

Abstract

The invention relates to a power grid oscillation starting device and an oscillation starting control method. The device comprises an oscillation starting loop, a first alternating current interface,a second alternating current interface and a high-precision measuring system. The method comprises the following steps of changing impedance and / or current accessed to a power supply object through the oscillation starting loop, and simultaneously causing system oscillation or resonance to construct system conditions for a stable boundary test of the power supply object; and measuring, calculatingand displaying the oscillation boundary value of the power supply object by using the high-precision measuring system. The technology of the power grid oscillation starting device and the oscillationstarting control method can simulate strong and weak power grids and cause system oscillation, is used for testing the reaction of a distributed power supply and a micro-grid in a oscillation starting system, further obtains the adapting capability to the strong and weak power grids and the self-stability boundary condition, and is vital to improving the adaptability and the stability of the tested equipment and reducing the oscillation of a power system with multi-power electronic access.

Description

technical field [0001] The invention relates to the field of distributed power supply and micro-grid network access detection, in particular to a power grid vibration starting device and a vibration starting control method. Background technique [0002] With the rapid development of distributed power generation, distributed energy storage, and micro-grids, relevant standards such as test requirements and methods for connecting to the grid have been issued. Among the detection functions, power frequency withstand voltage test, fault recovery grid-connected test, grid-connected and off-grid switching test, switching power control function test, anti-islanding protection function test, power quality test and reactive power control are routine tests; DC component test, Low voltage ride through test, voltage abnormal response test and frequency abnormal response test are unconventional tests. [0003] On the other hand, after the high-density distributed power is connected to th...

AI Technical Summary

Problems solved by technology

For conventional test items, power frequency withstand voltage tester, leakage current tester, power analyzer, power quality tester, power grid simulator, load disturbance and other devices can meet the requirements, but the test environment built by the above testing equipment cannot reproduce complex Due to problems such as oscillation and resonance under working conditions, it is impossible to test the boundary of oscillation or divergent instability of the equipment under test or the system under test

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