Multichannel direct current added damping control device capable of simultaneously restraining sub-synchronization and low frequency oscillation, and parameter setting method of multichannel direct current added damping control device

A technology of additional damping control and subsynchronous oscillation, which is applied in the direction of reducing/preventing power oscillation, etc., and can solve problems such as multi-channel DC additional damping controller devices that have not been seen.

Inactive Publication Date: 2014-05-14
SICHUAN UNIV
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Problems solved by technology

However, there are no patent documents and non-patent literature reports on a multi-channel DC additional d...

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  • Multichannel direct current added damping control device capable of simultaneously restraining sub-synchronization and low frequency oscillation, and parameter setting method of multichannel direct current added damping control device
  • Multichannel direct current added damping control device capable of simultaneously restraining sub-synchronization and low frequency oscillation, and parameter setting method of multichannel direct current added damping control device
  • Multichannel direct current added damping control device capable of simultaneously restraining sub-synchronization and low frequency oscillation, and parameter setting method of multichannel direct current added damping control device

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Embodiment

[0030] 1. Analyze system oscillation characteristics by matrix beam algorithm

[0031] In island operation mode, #1 DC system reduces power to 25% (1600MW) single-pole operation. The risk of grid subsynchronous oscillation caused by #1 DC in the above way is evaluated by using the unit action factor method (UIF). The calculation results of the unit action factor (UIF) are shown in Table 1.

[0032] Table 1 UIF calculation results

[0033]

[0034] It can be seen from Table 1 that under the island mode constructed above, the UIF calculation results of the relevant units of #1 and #2 power plants exceed 0.1. Therefore, the interaction between the relevant thermal power plant and #1 converter station is enhanced, which increases the risk of causing subsynchronous oscillation of the AC-DC interconnected grid.

[0035] The matrix beam algorithm is used to identify the subsynchronous oscillation and low frequency oscillation modes of the system, and the results are shown in Ta...

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Abstract

The invention discloses a multichannel direct current added damping control device capable of simultaneously restraining sub-synchronization and low frequency oscillation, and a parameter setting method of the multichannel direct current added damping control device. The device is characterized in that the device identifies the subsynchronous oscillation, the low frequency oscilation frequency and the damping of a direct current under island running and a system reduced-order model on the basis of a matrix pencil algorithm which has high operation efficiency and anti-interference capacity, a multichannel direct current added damping controller is designed through a root locus method so as to reduce mutual effects between oscillation modes, and sub-synchronization and low frequency oscillation can be simultaneously restrained. Electric generator rotating speed signals are divided into multiple frequency bands according to results of analysis conducted on characteristics of system oscillation through the matrix pencil algorithm, a passageway corresponding to each frequency band can independently adjust the gain, the phase position, the output amplitude limit and the filter parameters, and therefore appropriate damping can be provided for sub-synchronization and low frequency oscillation in different frequency bands. The device is efficient and easy to obtain, and the function of simultaneously restraining sub-synchronization and low frequency oscillation through the direct current added damping controller is achieved for the first time in the high voltage direct current transmission field.

Description

technical field [0001] The invention relates to a multi-channel DC additional damping control device and a parameter setting method for simultaneously suppressing subsynchronous and low-frequency oscillations, belonging to the field of high-voltage direct current transmission. Background technique [0002] In the context of smart interactive grids, the coexistence of strong AC and strong DC has become an inevitable choice for the "Sanhua" UHV synchronous grid. At present, the power system sending end has formed a situation of multiple DC drop points. This special system is composed of several large power plants connected to the sending-end converter station group, and it is very likely to operate in an isolated island. In islanding mode, the rapid control of high voltage direct current (HVDC) causes an increased risk of subsynchronous oscillations, which can be accompanied by low frequency oscillations due to insufficient damping between the generator rotors. The interacti...

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Application Information

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IPC IPC(8): H02J3/24
Inventor 李兴源赵睿李保宏刘天琪王渝红张英敏陈实曾琦
Owner SICHUAN UNIV
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