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A dynamic DC voltage stabilization method for a static synchronous reactive power compensation device

A compensation device, static synchronization technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation and other directions, can solve problems such as cost increase, capacitor voltage increase, controller power supply damage, etc., to achieve performance improvement and recovery speed The effect of raising and lowering cost requirements

Active Publication Date: 2015-11-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0007] 4. The increase of the capacitor voltage on the DC side will have a certain impact on the DC energy acquisition of the STATCOM controller, especially in the way of using a single step-down switching power supply for the controller. This overvoltage may cause damage to the controller power supply. , Simply increasing the voltage operating range of the switching power supply will also increase the cost, which is not an economical choice

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  • A dynamic DC voltage stabilization method for a static synchronous reactive power compensation device
  • A dynamic DC voltage stabilization method for a static synchronous reactive power compensation device
  • A dynamic DC voltage stabilization method for a static synchronous reactive power compensation device

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] When the STATCOM is in the process of capacitive-inductive switching, by reasonably selecting the action time of the reactive power given signal of the STATCOM controller, the phase reversal of the STATCOM output current occurs at an ideal position, and then the active power transfer during the switching process It is relatively stable, which ensures the voltage stability of the STATCOM DC capacitor.

[0041] The invention provides a dynamic DC voltage stabilization method for a static synchronous reactive power compensation device. The method includes the following steps:

[0042] Step 1: Calculate Grid Voltage and the output voltage of the static synchronous reactive power compensation device after the sudden change of the load reactive power signal

[0043] Step 2: Calculate the output current i(t) of the static synchronous reactive power compe...

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Abstract

The invention provides a dynamic direct-current voltage-stabilizing method for a static synchronous reactive compensation device. The method comprises the following steps: calculating a network voltage and an output voltage, obtained after a load reactive signal suddenly changes, of the static synchronous reactive compensation device, calculating an output current i(t), obtained after the reactive preset sudden change is output, of the static synchronous reactive compensation device, and selecting a switching point with the best capacitive and inductive characters. According to the dynamic direct-current voltage-stabilizing method for the static synchronous reactive compensation device, due to the fact that the output current is stabilized in the switching process, the symmetric performance and harmonic content of the output current of the static synchronous reactive compensation device are greatly improved, the dynamic performance of the static synchronous reactive compensation device is improved, the current of the static synchronous reactive compensation device is normally output in the switching process of the capacitive and inductive characters, the short-time over-current phenomenon can not occur, and the performance of the static synchronous reactive compensation device is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a dynamic DC voltage stabilization method for a static synchronous reactive power compensation device. Background technique [0002] The DC voltage regulation of cascaded H-bridge inverter STATCOM has been an important research topic in this field. The quality of the DC voltage stabilization effect directly affects the stability of the STATCOM device itself, and at the same time has many effects on the output characteristics of the device. Since the cascaded H-bridge units of the device are independent, different means need to be used for voltage regulation control for different working states. Steady-state voltage regulation has received a lot of attention in previous studies on voltage regulation problems. For dynamic voltage regulation, due to its rapid and complicated process, and the problem can be alleviated to a certain extent when there is a large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 赵小英刘汉民何红光时智勇郑青青
Owner STATE GRID CORP OF CHINA
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