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A commutation failure acceleration protection method and system

A technology of commutation failure and protection devices, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as system oscillation, chain reaction, power grid collapse, etc., and achieve the effect of ensuring safe and stable operation

Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +2
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Problems solved by technology

However, according to the existing strategy, when continuous commutation failure occurs in only one pole (or single-layer or single converter), only the double-bridge commutation failure protection fast section can act to remove the fault after 2.6s. Sustained commutation failure for such a long time is very likely to trigger a chain reaction, causing the entire system to oscillate and even the power grid to collapse

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  • A commutation failure acceleration protection method and system
  • A commutation failure acceleration protection method and system
  • A commutation failure acceleration protection method and system

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Embodiment Construction

[0038] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and implementation examples.

[0039] The overall architecture of the control and protection system, taking the acceleration protection configured in the converter protection device and the acceleration protection comprehensive judgment logic configured in the pole control device as an example, is as follows: figure 1 shown. A communication network system of inverter protection device-inverter control device-pole control device is constructed through high-speed bus, and the pole control device transfers the calculated power value to the inverter protection device through the inverter control device. The protection device transmits the protection action signal to the pole control device through the inverter control device (the inverter control device directly judges after the single inverter section operates, no need to forward it), and the pole ...

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Abstract

The invention discloses a commutation failure acceleration protection method and system, belonging to the field of high-voltage / ultra-high-voltage direct current transmission. The method includes the following steps: (1) configuring a commutation failure acceleration protection bipolar segment, a unipolar segment, a single layer segment and a single converter segment; (2) configuring a power latch; (3) using the power latch The output power value and the corresponding power setting value and the setting value of the maximum allowable commutation failure times are used for accelerated protection logic judgment. When the specific commutation failure times exceed the fixed value times, the converter outputs the corresponding protection action signal; (4) According to The action signal of each stage of protection in each converter can selectively perform bipolar blocking, unipolar blocking, single-layer blocking or single-converter blocking. The invention can simultaneously realize the rapid protection of bipolar, single-pole, single-layer and single converters when continuous commutation failure occurs, achieve the purpose of timely removal of the faulty converters, and ensure the safe and stable operation of the power grid system.

Description

technical field [0001] The invention relates to a commutation failure acceleration protection method and system, belonging to the field of high-voltage / ultra-high-voltage direct current power transmission. Background technique [0002] The commutation failure of the grid commutation converter (LCC, Line Commutated Converter) in the HVDC / UHVDC transmission system has always been an important factor affecting the safe operation of the large power grid. It is especially prominent under the pattern of "weak friendship". [0003] With the increase of the capacity of the DC system, the impact on the system when a single converter station fails becomes stronger and stronger. The newly commissioned ±1100kV Jiquan UHVDC project has a bipolar rated transmission capacity of up to 12000MW. If the unipolar (or single-layer) continuous commutation fails, the active power deficit will reach 6000MW, far exceeding the early HVDC project (3000MW). The power level of bipolar continuous commu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 唐俊阮思烨吕鹏飞卢宇何茂慧王永平徐凯邹强张靖
Owner NR ELECTRIC CO LTD
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