Programmable trouble power simulator

Abstract

The invention discloses a programmable trouble power simulator which is characterized in that the programmable trouble power simulator consists of an incoming line reactor, an LC (inductor-capacitor) filter, a direct-current bus capacitor, a voltage hall sensor, a current hall sensor, a rectification-side current transformer, an inversion-side current transformer and a direct-current voltage limiting protection circuit. An upper computer sends driving signal commands to a DSP (Digital Signal Processor) to control the work of a rectification-side current transformer and an inversion-side current transformer respectively. The programmable trouble power simulator can realize the simulation of various power grid failures such as symmetrical and unsymmetrical power grid voltage sag, unbalance three-phase circuits, harmonic distortion, frequency shift, phase angle hopping, voltage fluctuation and the like, and the parameters such as the voltage sag amplitude, the phase number, the unbalance three-phase circuit degree, harmonic times and proportion, the frequency shifting amplitude and direction, the phase angle changing size and property, voltage fluctuation trends and the failure lasting time and the like all can be adjusted flexibly. The programmable trouble power simulator can be used as a testing device for researching a wind power generation system and examining the delivery performance, or is used as a trouble power device for testing the performance of other grid-tied power electronic equipment.

Description

technical field [0001] The invention relates to a programmable fault power simulation device, which can be used as a test device for the research of wind power generation systems based on double-fed induction generators or permanent magnet synchronous motors and the performance assessment of the factory, and can also be used as a performance test device for other grid-connected power electronic equipment. Faulty power supply unit for testing. Background technique [0002] With the rapid increase in the proportion of large-scale wind turbines mainly based on variable-speed constant-frequency doubly fed induction generators (DFIG) in the power grid, the power system has a great impact on the operation of grid-connected wind turbines under external grid failures. Capabilities put forward higher and higher demands. Judging from the wind power grid-connected regulations issued by wind power operators or power dispatching departments in various countries in the world, when there ...

AI Technical Summary

Problems solved by technology

However, this device can only simulate the drop of grid voltage, and cannot comprehensively reflect other important phenomena and characteristics in the fault grid, such as voltage fluctuation at the grid-connected point of wind turbines, three-phase imbalance, harmonic distortion, frequency drift, and phase angle jump. Variations

Therefore, its popularization and application in the performance testing and research of grid-connected wind turbines and other electrical and electronic products are limited.

[0008] From the above analysis, it can be seen that no matter the form of impedance, the form of transformer or the existing power electronic form, the voltage drop generator has the defect of single function, that is, it can only simulate symmetrical and asymmetrical voltage drop, but cannot fully and truly reflect the fault. Other important characteristics of the power grid, it cannot meet all the requirements of the wind turbine performance test before grid connection

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