Impedance source high-speed power generator two-stage boosting grid-connecting system based on VIENNA rectifier

Abstract

The invention discloses an impedance source high-speed power generator two-stage boosting grid-connecting system based on a VIENNA rectifier. The impedance source high-speed power generator two-stageboosting grid-connecting system based on the VIENNA rectifier comprises the following components of a high-speed power generator, the VIENNA rectifier, an impedance source inverter, a three-phase filter reactor and two controllers. The invention further discloses a control method for the system. The VIENNA rectifier is introduced at the machine side. Double-closed-loop controlling is performed onthe rotating speed of the high-speed power generator and the input power factor of the rectifier. One-stage boosting is performed. The impedance source inverter is introduced into the network side. Double-closed-loop controlling is performed on capacitive voltage and grid-connecting power factor of the impedance source network, and next-stage boosting is performed. The impedance source high-speedpower generator two-stage boosting grid-connecting system can settle a problem of severe stator current distortion of the high-speed power generator and furthermore reduces voltage stress of a switchdevice, thereby improving stability and efficiency of the system.

Description

technical field [0001] The invention belongs to the field of generator grid-connected control, in particular to a VIENNA rectifier-based impedance source high-speed generator two-stage step-up grid-connected system and a control method thereof. Background technique [0002] Energy is the source of power to promote economic development and social progress, and is an important material related to the national economy, the people's livelihood and social stability. With the rapid development of my country's modern industry, fossil energy sources such as oil, natural gas and coal are gradually exhausted, and environmental problems are becoming increasingly prominent. Energy and the environment have become major issues facing our country. [0003] Waste heat refers to the energy discharged after industrial utilization of coal, oil, and natural gas, which cannot continue to participate in other production processes. It is manifested in the form of high-temperature heat energy, a...

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Problems solved by technology

[0005] Traditional high-speed generators use a three-phase six-switch PWM rectification topology. With the continuous increase in the rated speed of high-speed generators, the output frequency of high-speed generators has increased significantly, and may even reach thousands of Hertz, which brings great benefits to the rectification and modulation of high-speed generators. Difficult, the resulting harmonics of the stator current of the generator will not only increase the loss and temperature rise of the high-speed generator, but also increase its torque ripple, threatening the safety of the system

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