Dynamic power regulation and optimization method of impedance source wind power system under grid fault

Abstract

The present invention disclosed a dynamic power adjustment and optimization method of the permanent magnetic wind power generation system under the power fault of the power grid voltage. The steps include: collect and outlet voltage u abc , Judging u abc Whether it is smaller than the preset voltage of the outlet U. abc * ; Collection of impedance source network capacitor voltage u C1 , Judging u C1 Whether it is greater than the capacitor valve voltage U C1N ; abc <u abc * U C1 > U C1N , Improved source direct drive permanent magnetic air power generation system enters the electromagnetic torque self -fixed mode. According to the falling state of the power grid voltage, the impedance source network inductance current will be fixed L * ; Collection of wind turbine speed ω g , Judging ω g Whether it exceeds the rated speed ω of the wind turbine gN ; g > ω gN , Adjust the paddle distance angle, make the impedance source direct drive the permanent magnetic air power generation system into the constant speed modulus.The invention saves the Crowbar circuit, simplifies the system structure, and improves the system's response speed and stability.

Description

technical field [0001] The invention belongs to the field of grid-connected control of wind power generation, and in particular relates to a dynamic power adjustment and optimization method of an impedance source wind power system under grid failure. Background technique [0002] Impedance source (Z source, quasi-Z source, semi-quasi-Z source, etc.) direct-drive permanent magnet wind power generation system has the advantages of single-stage control, allowing the inverter bridge arm to pass through, and no need to insert dead time. In order to further improve the reliability of grid connection And reduce system cost provides a new way of thinking. At present, when the grid voltage fails, the impedance source direct drive permanent magnet wind power generation system continues to use the fault ride-through method of three-phase uncontrollable +Boost and dual PWM topology, and uses a crowbar circuit to balance the energy between the machine side and the grid side. This method...

AI Technical Summary

Problems solved by technology

At present, the impedance source direct drive permanent magnet wind power generation system continues to use the fault ride-through method of three-phase uncontrollable +Boost and dual PWM topology when the grid voltage fails, and uses a crowbar circuit to balance the energy between the machine side and the grid side. This method greatly increases the system cost and control difficulty, and reduces the economy and reliability of the system

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