Open type grid-connection experiment system of variable-speed constant-frequency double-fed wind power generator unit and open type grid-connection experiment method

Abstract

The invention discloses an open type grid-connection experiment system of a variable-speed constant-frequency double-fed wind power generator unit and an open type grid-connection experiment method. The open type grid-connection experiment system is applied to a power grid. The open type grid-connection experiment system comprises a plurality of fuses, a plurality of contactors, a first voltage and current transducer, a second voltage and current transducer, a grid-side converter, a DC capacitor, a rotor-side converter and a double-fed motor. The open type grid-connection experiment system is characterized by further comprising a voltage adjustable isolation transformer, a DSP / FPGA control system, an encoder and an optical coupling isolation unit. The voltage adjustable transformer is arranged between the power grid and the fuses in series and can be adjusted manually so as to simulate and achieve grid connection of various voltage amplitudes. The DSP / FPGA control system is used for controlling a first set of control signals and a second set of control signals according to sampling signals of the first voltage and current transducer, wherein the first set of control signals and the second set of control signals are required by the grid-side converter and the rotor-side converter and outputted to the grid-side converter and the rotor-side converter. The encoder is connected with the double-fed motor and used for detecting the rotating speed of the rotor side of the double-fed motor. The optical coupling isolation unit is connected between the encoder and an FPGA unit and used for inputting the signals into the FPGA unit after the signals are subjected to filtering processing.

Description

Technical field: [0001] The invention relates to the technical field of power electronic control, in particular to an open grid-connected experiment system and method based on a variable-speed constant-frequency double-fed wind power generating set. Background technique: [0002] As human beings continue to pay attention to energy shortage and environmental pollution, the development and utilization of renewable energy, especially the development and utilization of wind energy are being highly valued by various countries. [0003] In the traditional constant speed and constant frequency power generation mode, the output frequency of the generator depends entirely on the speed of the fan. Before the generator is connected to the grid, it must be strictly synchronized. paralyzed or collapsed. [0004] In the variable-speed constant-frequency wind power generation system, a "flexible connection" is formed between the doubly-fed generator and the power system. The doubly-fed ge...

AI Technical Summary

Problems solved by technology

[0003] In the traditional constant speed and constant frequency power generation mode, the output frequency of the generator depends entirely on the speed of the fan. Before the generator is connected to the grid, it must be strictly synchronized. paralyzed or collapsed

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