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A filter optimization control method and device for reducing transient and steady-state overvoltage

A transient overvoltage, optimized control technology, applied in circuit devices, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve the problem of not considering transient or steady-state overvoltage coordination and unchecked restrictions It can suppress transient and steady-state overvoltage, reduce the number of input groups, and improve stability.

Active Publication Date: 2022-08-09
NANJING NARI GROUP CORP +1
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Problems solved by technology

The above studies usually independently optimize the control of transient or steady-state overvoltages after high-power DC disturbances, without examining restrictive faults, without distinguishing the limiting factors of overvoltages, and control measures do not consider transient or steady-state overvoltages. Coordination of steady-state overvoltages

Method used

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  • A filter optimization control method and device for reducing transient and steady-state overvoltage
  • A filter optimization control method and device for reducing transient and steady-state overvoltage
  • A filter optimization control method and device for reducing transient and steady-state overvoltage

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] like figure 1 As shown in the figure, a filter optimization control method for reducing transient and steady-state overvoltage is applied to an AC / DC transmission system formed by a converter station and a new energy generator, including the following steps:

[0050] Step 1: Calculate the transient overvoltage stability margin η of the converter station after the commutation failure of the DC transmission system, the restart of the DC transmission system, and the blocking fault of the DC transmission system, respectively. z1 and the steady-state overvoltage stability margin η of the converter station w , and the transient overvoltage stability margin η of the busbar at the end of the new energy generator z2 ;

[0051] Step 2: According to the transient overvoltage stability margin η of the converter station under each fault z1 and the transient overvoltage s...

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Abstract

The invention discloses a filter optimization control method and device for reducing transient and steady-state overvoltages. Overvoltage stability margin η z1 and the steady-state overvoltage stability margin η of the converter station w , and the transient overvoltage stability margin η of the busbar at the end of the new energy generator z2 ; Calculate the system transient overvoltage stability margin η under each fault z ; Determine the limiting factors of DC sending capacity, and formulate filter control strategies under different limiting factors according to the limiting factors of DC sending capacity. The invention can effectively suppress transient and steady-state overvoltage during DC fault, avoid large-scale new energy off-grid and equipment damage due to overvoltage, improve system stability, and ensure DC sending capability.

Description

technical field [0001] The invention relates to a filter optimization control method for reducing transient and steady-state overvoltage, and belongs to the technical field of power system and automation thereof. Background technique [0002] With the continuous commissioning of UHVDC projects in my country and the rapid development of new energy power generation, it has brought profound influence and many challenges to power grid system cognition, operation control and fault defense. In addition to conventional short-circuit faults, high-power disturbance shocks in the DC system, such as blocking faults, commutation failures, restarts, etc., will cause transient overvoltage and steady-state overvoltage in DC converter stations and new energy stations, resulting in The risk of a large number of new energy units being disconnected from the high-voltage grid increases, thereby limiting the DC transmission power. [0003] At present, the countermeasures to reduce the transient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/01H02J3/36
CPCH02J3/12H02J3/01H02J3/36H02J2203/10H02J2203/20H02J2300/20H02J2003/365Y02E40/40
Inventor 张红丽摆世彬刘福锁倪禛霖郜建良田志浩项丽李威薛峰张倩王玉吴雪莲
Owner NANJING NARI GROUP CORP
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