PMSG low-voltage ride through system based on reactive power control

A low-voltage ride-through and power control technology, applied in the direction of single-grid parallel feeding arrangement, etc., can solve problems such as unbalanced voltage, wind turbine off-grid, drop, etc.

Inactive Publication Date: 2016-03-23
SHANGHAI DIANJI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a low-voltage ride-through method for the permanent magnet direct drive wind power system under unbalanced grid voltage to solve the problems caused by grid voltage asymmetry or unbalance. The voltage drop of the wind turbine caused the problem of the wind turbine being disconnected from the grid; moreover, when the grid dropped deeply, it could continue to ensure the grid-connected operation of the wind turbine

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  • PMSG low-voltage ride through system based on reactive power control
  • PMSG low-voltage ride through system based on reactive power control
  • PMSG low-voltage ride through system based on reactive power control

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Embodiment Construction

[0022] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0023] In the present invention, a static synchronous var compensator is installed on the high-voltage end of the grid-connected port, and the static var compensator (STATCOM) and the grid-side inverter (according to the principle of wind energy capture, track the speed of the wind turbine to realize maximum wind energy utilization and output The optimal power captures the depth of the grid voltage drop to output reactive power to achieve the role of regulation. It is installed outside the wind turbine system) for coordinated control to improve the reactive power compensation capability of the wind power system and improve the performance of permanent magnet direct drive wind turbines. (PMSG) low voltage ride through capability of the system.

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Abstract

The invention provides a PMSG low-voltage ride through system based on reactive power control. The system comprises an inverter connected with a power grid, a static synchronous reactive power compensator capable of performing continuous adjustment, and a PMSG system. The static synchronous reactive power compensator is connected to a high-voltage end of a grid-connected port of the PMSG system. The static synchronous reactive power compensator cooperates with the inverter to execute combined control, so, when a voltage of the power grid fluctuates in a predetermined normal range, the static synchronous reactive power compensator is used to stabilize a voltage of the grid-connected port; and, when a fault of the power grid causes the voltage of the grid-connected port to fall off and then the voltage of the power grid is not in the predetermined normal range, the inverter operates at a static reactive compensation mode, and the inverter is combined with the static synchronous reactive power compensator to output reactive power to the power grid.

Description

technical field [0001] The present invention relates to the technical field of large-scale wind power grid connection, more specifically, the present invention relates to a PMSG (PermanentManetSynchronousGenerators, permanent magnet direct drive synchronous generator) low voltage ride through system based on reactive power control. Background technique [0002] At present, for the low voltage ride-through control of the permanent magnet direct drive wind power system under the unbalanced grid voltage, the main method is to obtain the voltage and current values ​​of the positive and negative sequences by obtaining the phase of the positive and negative sequence voltages, and calculate the active power consumption of the grid-connected reactor DC component, cosine component, sine component, calculate the positive and negative sequence components of the inverter output current by calculating the reference value of the inverter output active power and reactive power DC component....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 崔立悦高桂革曾宪文
Owner SHANGHAI DIANJI UNIV
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