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DC control method and device based on additional control strategy of inverter arc extinguishing angle

A DC control and additional control technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, power transmission AC network, etc., can solve problems such as unclear control mode, reduce risks and maintain stability Effect

Active Publication Date: 2021-12-31
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

These features can be attributed to the ambiguity of the control pattern shortly after the fault cleared

Method used

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  • DC control method and device based on additional control strategy of inverter arc extinguishing angle
  • DC control method and device based on additional control strategy of inverter arc extinguishing angle
  • DC control method and device based on additional control strategy of inverter arc extinguishing angle

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Embodiment Construction

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] see figure 1 , which shows a flow chart of a DC control method based on an additional control strategy for the arc-extinguishing angle of the inverter of the present application.

[0023] Such as figure 1 As shown, in step S101, in response to the obtained three-phase voltage value, it is judged based on the comparator whether the voltage...

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Abstract

The invention discloses a DC control method and device based on an additional control strategy for the arc extinguishing angle of an inverter. The method includes: if a certain phase voltage value is lower than a preset voltage value, reduce the AC voltage, increase the DC current, and calculate The maximum phase shift value between the voltages of each phase, and calculate the increase value of the overlap angle based on the change of voltage and current; if the control mode of the inverter is switched from constant arc extinguishing angle control to constant current Whether the firing angle under the arc angle control is greater than the firing angle under the constant current control; Correction, so that the corrected arc-extinguishing angle is obtained; based on the corrected arc-extinguishing angle and the initial reference arc-extinguishing angle under the control of the fixed arc-extinguishing angle, the final arc-extinguishing angle is calculated. By modifying the arc extinguishing angle and the initial reference arc extinguishing angle under constant arc extinguishing angle control, the final arc extinguishing angle under constant current control is calculated to maintain the stability of DC current.

Description

technical field [0001] The invention belongs to the technical field of AC / DC hybrid power grids, and in particular relates to a DC control method and device based on an additional control strategy for arc extinguishing angles of inverters. Background technique [0002] The AC / DC hybrid power grid is a typical nonlinear system, and the AC / DC interaction coupling under the impact of large disturbances makes the transient response process of the hybrid power grid very complicated. Therefore, the DC control function usually needs to be optimally set according to the characteristics of the connected grid. [0003] Commutation failure is one of the most common failures of inverters. When the commutation between the two bridge arms is over, if the valve that has just exited conduction fails to recover the blocking ability within the time of reverse voltage action, or the commutation process has not been completed during the reverse voltage period , in both cases, when the valve v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/521H02M1/06H02M1/32H02J3/36
CPCH02M7/521H02M1/06H02M1/32H02J3/36Y02E60/60
Inventor 舒展谌艳红康兵陈波段志远程思萌陶翔汪硕承闵泽莺
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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