High-power power grid simulator topological structure applied to MW grade

Abstract

The present invention discloses a high-power power grid simulator topological structure applied to an MW grade. The high-power power grid simulator of MW grade is decomposed into a fundamental wave generation module and a harmonic wave generation module set which are connected in series. The harmonic wave generation module set is formed by a plurality of harmonic wave generation module units, the fundamental wave generation module employs MW grade three-phase PWM inverter with high-power and low switching frequency to realize high-power requirement of high-power power grid simulator, and the harmonic wave generation modules employ a plurality of three-phase PWM inverters with low-power and high switching frequency to improve the control bandwidth of the high-power power grid simulator. The high-power power grid simulator topological structure applied to the MW grade is taken as a power grid voltage generation device in a distributed generation grid-connected research so as to solve the problem that the MW grade high-power power grid simulator is narrow in control bandwidth, provide required power grid environment for the distributed generation grid-connected research and satisfy the research demand.

Description

technical field [0001] The invention belongs to the field of power quality analysis and control, and relates to a topology suitable for MW-level high-power grid simulators, which solves the problem of narrow control bandwidth of MW-level high-power grid simulators. Provides a generating device for the grid environment. technical background [0002] As the power of the distributed generation system increases, the power of the grid simulator used to provide the grid environment for the system also increases. However, in the process of designing the topology of the high-power grid simulator, due to the limitation of the switching frequency, its control bandwidth will be affected, resulting in a decrease in the performance of the simulator. Therefore, in order to adapt to the development of distributed generation systems, it is urgent to provide a high-power grid simulator topology suitable for MW level. [0003] At present, the research on grid simulators has become a hot iss...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of narrow control bandwidth of high-power grid simulators in the prior art. The idea is to decompose the MW-level high-power grid simulator into fundamental wave generation modules and harmonic generation The module group is composed of multiple harmonic generation module units. The fundamental wave generation module uses a MW level three-phase PWM inverter with high power and low switching frequency to meet the high power requirements of the high-power grid simulator. The harmonic generation module uses multiple low Three-phase PWM inverter with high power switching frequency controls the bandwidth of high-power grid

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