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Synchronous motor-based power electronic grid-connected device and control method thereof

A technology of power electronics and synchronous motors, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of effective control, inability to realize, large-scale new energy interlocking off-grid, etc., to avoid damage, improve grid-connected support capability, Avoid off-grid effects

Active Publication Date: 2021-11-16
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that when various transient and steady-state faults occur in the power grid, the effective control of system frequency and voltage cannot be realized, which will easily cause large-scale new energy interlocking and off-grid, and seriously affect the safe grid connection of large-scale new energy. The invention provides a synchronous motorized power electronic grid-connected device, including: a converter bridge, an energy consumption switching device, an open-winding motor and an excitation control component;

Method used

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  • Synchronous motor-based power electronic grid-connected device and control method thereof
  • Synchronous motor-based power electronic grid-connected device and control method thereof
  • Synchronous motor-based power electronic grid-connected device and control method thereof

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Embodiment 1

[0049] Embodiment 1: A synchronous motorized power electronic grid-connected device, such as figure 1As shown, including: converter bridge, energy consumption switching device, open winding motor, excitation control components;

[0050] An open-winding motor consists of a three-phase stator winding and a rotor;

[0051] A damper winding is installed on the rotor;

[0052] The DC side of the converter bridge is connected to the DC power supply, and the output side of the converter bridge is connected to the input end of the three-phase stator winding of the open-winding motor;

[0053] One end of the energy consumption switching device is connected to the output side of the converter bridge, and the other end is connected to the three-phase stator winding of the open-winding motor;

[0054] The output terminal of the three-phase stator winding of the open-winding motor is connected to the AC grid;

[0055] The rotor of the open-winding motor is connected to the field control...

Embodiment 2

[0071] The present invention also provides a control method for a synchronous motorized power electronic grid-connected device, including: from the start-up stage to the steady-state operation stage, and from the transient state operation stage to the steady-state operation stage. introduce:

[0072] 1. Start-up phase

[0073] Since the structure of synchronous motors cannot realize self-starting, the asynchronous starting method of three-phase synchronous motors is generally used. Most modern synchronous motors are equipped with starting windings (that is, damping windings) similar to the cage windings of asynchronous motors on the rotor. At this time, similar The method of starting a cage-type asynchronous motor is used to start a synchronous motor.

[0074] Based on the idea of ​​asynchronous starting of synchronous motors, short-circuit the output end of the open-winding motor, use the converter bridge to invert the DC power provided by the DC power supply into three-phas...

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Abstract

The invention provides a synchronous motor-based power electronic grid-connected device and a control method thereof. The synchronous motor-based power electronic grid-connected device comprises a converter bridge, an energy consumption switching device, an open winding motor and an excitation control assembly, wherein the open winding motor comprises a three-phase stator winding and a rotor; a damping winding is mounted on the rotor; the direct current side of the converter bridge is connected with a direct current power supply, and the output side of the converter bridge is connected with the input end of the three-phase stator winding; one end of the energy consumption switching device is connected with the output side of the converter bridge, and the other end of the energy consumption switching device is connected with the input end of the three-phase stator winding; the output end of the three-phase stator winding is connected with an alternating current power grid; and the rotor is connected with the excitation control assembly. The active supporting capacity of the new energy unit is improved by introducing the energy consumption switching device and the excitation control assembly.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a synchronous motorized power electronic grid-connected device and a control method thereof. Background technique [0002] The characteristics of the reverse distribution of renewable resources and electricity load demand determine that large bases and long-distance UHV AC / DC transmission are one of the leading forms of new energy development and utilization. [0003] With the transformation of the energy structure, the UHVDC sending-end supporting power structure is undergoing profound changes. The early sending-end power supply was mainly thermal power / hydropower with synchronous generators, and gradually changed to wind power with power electronic devices as the main body. Instead, the high proportion of new energy leads to further weakening of the sending-end grid, and the short-circuit ratio of new energy stations and grid points is gradually reduced. On...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/42H02J3/50
CPCH02J3/38H02J3/42H02J3/50
Inventor 刘纯李光辉何国庆王伟胜冯双磊
Owner CHINA ELECTRIC POWER RES INST
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