A sub-harmonic reactive power generating device

A technology for generating device and sub-harmonic, applied in the field of power grid, can solve the problems of limited sub-harmonic capability, poor tracking performance, poor tracking ability, etc., and achieve the effects of fast response speed, large capacity and wide adjustable range

Active Publication Date: 2017-10-17
CHINA SHENHUA ENERGY CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies have shortcomings such as slow response speed and poor tracking ability, and the ability to generate sub-harmonics is limited, which cannot fundamentally solve the existing problems
In view of the shortcomings of the existing technology, such as slow response speed and poor tracking performance, it is necessary to propose a new solution

Method used

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  • A sub-harmonic reactive power generating device
  • A sub-harmonic reactive power generating device
  • A sub-harmonic reactive power generating device

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Embodiment Construction

[0029] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0030] Such as figure 1 As shown, in the power system, the generator set transmits electric energy to the grid through the transformer and the transmission line. In order to reduce the transmission loss of the transmission line, the method of increasing the series compensation is often used to improve the transmission capacity of the transmission line. However, this method of increasing series compensation may also cause the problem of subsynchronous oscillation, causing the generator set to operate at an oscillation frequency lower than the synchronous frequency, which seriously affects the safety of the power system. Therefore, many devices to suppress subsync...

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Abstract

The present invention relates to the technical field of a grid and discloses a subharmonic reactive power generator which comprises a control unit and a valve set unit. The control unit is used for obtaining the rotation speed deviation signal of a generator set and calculating the subharmonic current needed by inhibiting subsynchronous oscillation according to the rotation speed deviation signal, carrying out active-reactive decoupling and pulse width modulation on the grid voltage needed subharmonic current based on dq conversion, and using the demodulated signal to drive valve set unit such that the subharmonic current emitted by the valve set unit is reactive. The valve set unit is used for emitting the subharmonic current under the driving of the control unit and injecting the emitted subharmonic current into a grid in a reactive form. According to the subharmonic reactive power generator, the dq conversion is employed, after the active component and reactive component in the power system are decoupled, the independent control is carried out respectively to ensure that the emitted subharmonic is reactive, and the sub-synchronous oscillation is inhibited in a constant reactive mode.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a sub-harmonic reactive power generating device. Background technique [0002] With the continuous expansion of the power grid system, the demand for ultra-high voltage direct current transmission and large-capacity generator sets is also increasing. In order to reduce line transmission loss, controllable series compensation is commonly used to increase the grid-side voltage. Although it brings huge economic benefits, but It also brings new troubles to the safe and stable operation of the generator set, and the subsynchronous oscillation of the power system is one of the more serious problems. [0003] For this reason, many measures to suppress the subsynchronous oscillation of generators have been proposed, and the most used in the prior art are: bypass damping filter and static blocking filter composed of passive components; SVC device with power electronic devices added. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/24H02P9/00
CPCY02E40/30
Inventor 宋畅袁丁陈璟韩盛林薛成勇吉鹏张志波姜建国何师侯小平
Owner CHINA SHENHUA ENERGY CO LTD
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