Experiment system and method for unified electric energy quality controller

Abstract

The invention discloses an experiment system and method for a unified electric energy quality controller. The system includes a controllable voltage generating unit for generating dynamically adjustable voltage, a harmonic load unit used for generating current harmonic and providing a nonlinear load, a reactive power test accompanying unit use for generating reactive power, a bypass circuit breaker, a first circuit breaker and a second circuit breaker; one end of the controllable voltage generating unit is connected in parallel with the bypass circuit breaker, and thereafter is connected into power grid voltage, and the other end of the controllable voltage generating unit is connected with the series side of a UPQC; the harmonic load unit is connected with the parallel side of the UPQC through the first circuit breaker; and the reactive power test accompanying unit is connected with the parallel side of the UPQC through the second circuit breaker. According to the method, the above system is utilized to realize voltage compensation and harmonic suppression experiments and reactive power compensation experiments. With the method adopted, various kinds of function experimental confirmation of the unified electric energy quality controller can be realized based on one such experiment system. The experiment system and method have the advantages of simple structure principles, easy and convenient operation and excellent experimental performance.

Description

technical field [0001] The invention relates to a unified power quality controller, in particular to an experimental system and method for a unified power quality controller. Background technique [0002] The current growing demand for electricity has brought new challenges to the power supply of the grid. On the one hand, the nonlinear loads used in industrial production generate a large number of harmonic currents and reactive currents; on the other hand, with the high-tech industry With the rise of the power grid, the application of sensitive equipment such as high-performance office equipment, precision experimental instruments, and precision control equipment in the power grid is increasing year by year. These devices require the power grid to provide stable, uninterrupted, reliable and high-quality power supply. Unified power quality controller (UnifiedPowerQualityConditioner, UPQC), as a comprehensive power quality control device, has two parallel and series inverters...

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Problems solved by technology

[0003] At present, the following problems exist in the experimental verification of UPQC functions: 1) There is a lack of experimental platform experimental verification for high-voltage and large-capacity UPQC, and because UPQC has many functions, a single functional experimental circuit can no longer meet the experimental requirements of this variety of functions; 2) When verifying the dynamic voltage compensation function, the voltage fluctuation of the grid is generally simulated by a voltage regulator, whose voltage regulation accuracy is low, and can only realize the change of the voltage amplitude; when testing the reactive power compensation function, it is usually directly injected into the grid A certain amount of reactive power is likely to cause fluctuations and instability to the grid voltage

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