Direct-current power modulating method for high-voltage direct-current power transmission system

A DC power modulation and DC power technology, applied in the field of power systems, can solve problems such as poor modulation effect, negative damping, and deterioration of control effect, and achieve good modulation effect, recovery stability, and high modulation effect

Active Publication Date: 2012-07-25
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

The traditional DC power modulation uses the transmission power of the interval AC line as the input signal, which has a certain inhibitory effect on the control performance of small disturbances, and cannot adapt to changes in the grid structure. The debugging effect is average, and for large disturbances, the modulation effect is poor, even It may deteriorate the control effect, play a negative damping role, and the control robustness is poor

Method used

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  • Direct-current power modulating method for high-voltage direct-current power transmission system

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Embodiment Construction

[0018] In order to make the purpose, technical solution and advantages of the present invention more clear and definite, the theoretical basis of a DC power modulation method for HVDC transmission system provided by the present invention will be described in detail below and the effectiveness of the modulation effect will be proved.

[0019] In the technology known to those skilled in the field of power systems, the state equation of a single infinitely simplified power system operating in parallel with AC and DC can be described as follows:

[0020] δ · = ω s ω r ω · r = ...

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Abstract

The invention provides a direct-current power modulating method for a high-voltage direct-current power transmission system. According to the method, a dynamic new balance point is used as a control target, the system power oscillation caused by small disturbance can be fast damped, a higher modulation effect is realized, in addition, the debugging method uses the new balance point as the control target, the better modulation effect is also realized on large disturbance, and the robustness is high. Through simple system parameter determination and conversion, the direct-current power modulation quantity can be obtained, an electric power can fast damp the interval power oscillation under the conditions of fault generation and disturbance receiving, and the stability of the electric system is effectively recovered.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a DC power modulation method for a high-voltage direct current transmission system. Background technique [0002] With the development and construction of the power grid, the complexity and uncertainty of the power grid have increased significantly, and the uncertainty and possibility of various disturbances in the power grid have also increased significantly. According to the disturbance scale, power system disturbance stability can be divided into small disturbance stability (ie dynamic stability) and large disturbance stability (ie transient stability). Small-disturbance stability means that the power system is slightly disturbed during operation. After a disturbance dynamic process, the system operating point can return to the original operating balance point, such as power load fluctuations or instantaneous faults without line tripping in the power system. Small disturbances in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 谢惠藩王海军钱海冯鸫王奇
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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