HVDC Continuous Commutation Failure Suppression Method Based on Nonlinear vdcol

A commutation failure, non-linear technology, applied in output power conversion devices, power transmission AC networks, electrical components, etc., can solve the problems of slow response, low sensitivity, slow adjustment of inverter side voltage and DC transmission power, etc. , to achieve the effect of smooth change, enhanced sensitivity, and avoid increasing the current command

Active Publication Date: 2021-08-27
STATE GRID HUNAN ELECTRIC POWER +1
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  • Claims
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Problems solved by technology

However, the sensitivity of the traditional VDCOL is not high. When a serious fault occurs in the system, its response is slow, and the voltage on the inverter side and the DC transmission power are adjusted slowly, making it difficult to avoid continuous commutation failures in the system.

Method used

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  • HVDC Continuous Commutation Failure Suppression Method Based on Nonlinear vdcol
  • HVDC Continuous Commutation Failure Suppression Method Based on Nonlinear vdcol
  • HVDC Continuous Commutation Failure Suppression Method Based on Nonlinear vdcol

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Embodiment Construction

[0038] The overall structure of the HVDC system is as follows: figure 1 shown. The system mainly adjusts the transmission power and the voltage and current of the DC side through the trigger delay angle of the rectification side and the inverter side. Generally speaking, the control system of HVDC has various control functions such as constant current control, constant turn-off angle control, current deviation control and VDCOL control, and different control methods are selected by comparing and selecting units.

[0039] The VDCOL control in HVDC can only function after the voltage drops to a certain extent, and its control characteristics are also linear, so when a serious fault occurs in the system, its response is slow, resulting in slow adjustment of the inverter side voltage and DC transmission power , and then it is difficult to avoid continuous commutation failure in the system, so it is necessary to improve the traditional VDCOL control.

[0040] The nonlinear VDCOL ...

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Abstract

The invention discloses a non-linear VDCOL-based HVDC continuous commutation failure suppression method. On the one hand, the traditional linear VDCOL control is transformed into a nonlinear VDCOL control, and the slopes of different VDCOL control characteristics are set according to the drop degree of the DC bus voltage. , thereby adjusting the response speed of the DC current command in different voltage ranges; on the other hand, dynamically adjusting the control characteristics and working range of the nonlinear VDCOL according to the degree of system AC voltage drop, which improves the sensitivity of the HVDC system in severe faults and further Suppression of continuous commutation failures in HVDC systems.

Description

technical field [0001] The invention relates to the field of HVDC continuous commutation failure suppression control, in particular to a non-linear VDCOL-based HVDC continuous commutation failure suppression method. Background technique [0002] my country's primary energy and load demand are in reverse distribution, which objectively requires the optimal allocation of energy in a wide range. High-voltage direct current transmission (HVDC) has become an important component of long-distance and cross-regional grid interconnection due to its advantages such as large power transmission capacity, low transmission loss, rapid transmission power adjustment or reversal, high transmission reliability, and strong asynchronous communication capabilities. Means, long-distance, high-capacity high-voltage direct current transmission will also become the development trend of my country's future power grid. [0003] Traditional HVDC uses thyristors without self-shutoff capability as commut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M1/32H02M1/084
CPCH02J3/36H02M1/084H02M1/32H02M1/0025Y02E60/60
Inventor 孟庆强刘泽洪汪鑫洪乐荣罗安周小平姜劲松夏海涛刘一锋
Owner STATE GRID HUNAN ELECTRIC POWER
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