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

A technology for transient overvoltage and optimal control, applied in circuit devices, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc. sexual problems

Active Publication Date: 2020-10-20
NANJING NARI GROUP CORP +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

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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  • Filter optimization control method and device for reducing transient and steady-state overvoltage
  • Filter optimization control method and device for reducing transient and steady-state overvoltage
  • 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] Such as figure 1 As shown, a filter optimization control method to reduce transient and steady-state overvoltage is applied to the AC-DC transmission system formed by the converter station and the new energy terminal, 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 failure of the DC transmission system z1 and the steady-state overvoltage stability margin η of the converter station w , and the transient overvoltage stability margin η of the new energy machine-side busbar z2 ;

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

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Abstract

The invention discloses a filter optimization control method and device for reducing transient and steady-state overvoltage. The method comprises: respectively calculating a converter station transient overvoltage stability margin eta z1, a converter station steady overvoltage stability margin eta w and a new energy machine end bus transient overvoltage stability margin eta z2 after the commutation failure of the DC power transmission system, the restart of the DC power transmission system and the locking failure of the DC power transmission system; calculating a system transient overvoltage stability margin eta z under each fault; and judging a direct-current sending-out capability limited factor, and making filter control strategies under different limited factors for the direct-currentsending-out capability limited factor. According to the invention, transient and steady-state overvoltage during a direct current fault can be effectively suppressed, large-scale new energy off-grid and equipment damage caused by overvoltage are avoided, the stability of the system is improved, and the direct current sending-out capability is ensured.

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 systems and automation thereof. Background technique [0002] With the continuous commissioning of UHV DC projects in my country and the rapid development of new energy power generation, it has brought profound impacts and many challenges to the grid system cognition, operation control and fault prevention. In addition to conventional short-circuit faults, high-power disturbance impacts in the DC system, such as blocking faults, commutation failures, restarts, etc., will cause transient overvoltages and steady-state overvoltages in DC converter stations and new energy stations, resulting in A large number of new energy units have an increased risk of high-voltage off-grid, which in turn limits DC transmission power. [0003] At present, the countermeasures to reduce transient and steady-state ov...

Claims

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Application Information

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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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