Superconducting magnetic energy storage based double-fed fan low voltage ride-through method

A technology of superconducting magnetic energy storage and low-voltage ride-through, which is applied in the usage of superconductor elements, systems for storing electric energy, and electrical components, etc. The effect of small cost and capacity

Inactive Publication Date: 2019-06-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to adopt a solution to simultaneously solve the problems of low voltage ride through and unstable energy output, provide a

Method used

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  • Superconducting magnetic energy storage based double-fed fan low voltage ride-through method
  • Superconducting magnetic energy storage based double-fed fan low voltage ride-through method
  • Superconducting magnetic energy storage based double-fed fan low voltage ride-through method

Examples

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Example Embodiment

[0045] Example 1

[0046] The embodiment of the present invention provides a low voltage ride-through method for a doubly-fed fan based on superconducting magnetic energy storage. Superconducting magnetic energy storage devices include DC-DC converters, superconducting coils, capacitors and voltage source inverters. The superconducting coil is connected in parallel between the DC-DC converters. The capacitor is connected in parallel between the DC-DC converter and the voltage source inverter. The voltage source inverters A, B, and C are connected in parallel with the rotor side of the doubly-fed fan.

[0047] The supporting control strategies of the superconducting magnetic energy storage device include transient voltage control and current reverse tracking control; when no short-circuit fault occurs, the rotor-side inverter is controlled by the steady-state controller, and the superconducting magnetic energy storage-side inverter 6 Each switch is set to 0, in the hot standby st...

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PUM

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Abstract

The invention discloses a superconducting magnetic energy storage based double-fed fan low voltage ride-through method in the technical field of double-fed fan equipment. The method includes the following steps: a superconducting magnetic energy storage system is established; whether a double-fed fan is in a failure state is judged, a voltage source inverter is in a hot standby state and does notperform energy exchange with a rotor winding when the double-fed fan is operated in a non-fault state, and a DC-DC converter executes smooth output power control; and the DC-DC converter performs voltage stabilization control on a capacitor after a fault occurs, the voltage source inverter executes transient voltage control and current back tracking control, and a double-fed fan rotor side inverter executes transient voltage control and current back tracking control. Therefore, the problem of unstable energy output of the double-fed fan can be improved, and the low voltage ride-through capabilities of the double-fed fan can be enhanced.

Description

technical field [0001] The invention relates to the technical field of double-fed fan equipment, in particular to a low-voltage ride-through method for double-fed fans based on superconducting magnetic energy storage. Background technique [0002] Wind power generation is a distributed renewable energy power generation system. Wind power generating units generally consist of wind turbines, gearboxes, generators and their control systems. Commonly used wind power generators include squirrel-cage induction generators, doubly-fed induction generators and permanent magnet synchronous generators, in which the squirrel-cage induction generators are directly connected to the grid, the stator of the doubly-fed induction generator is directly connected to the grid, and the rotor passes through The inverter is connected to the grid, and the permanent magnet synchronous generator is connected to the grid through the inverter. In the current wind power market, doubly-fed wind turbines ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32H02J15/00
CPCY02E40/10Y02E40/60
Inventor 郑子萱肖先勇汪颖杨若奂李长松
Owner SICHUAN UNIV
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