Method and device for evaluating the constant value of AC filter in HVDC transmission system
An AC filter and high-voltage DC technology, which is applied in harmonic reduction devices, power transmission AC networks, and AC networks to reduce harmonics/ripples. The effect of small amount of calculation
Active Publication Date: 2020-12-18
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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However, in the case of faults in the island operation mode, the system frequency variation range is much greater than ±0.5Hz, and the system fluctuates with time. The AC filter obtained based on the existing conventional design cannot be applied to the island operation mode. There is no effective method to effectively determine whether the equipment capability meets the islanding requirements
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[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0056] Please refer to figure 1 , the first embodiment of the present invention provides a method for evaluating the constant value of the AC filter of the high-voltage direct current transmission system, which can be executed by the constant value evaluation equipment of the AC filter of the high-voltage direct current transmission system. In the embodiment of the present invention, the The AC filter rating evaluation equipment of the HVDC power transmission ...
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The invention discloses a method and device for evaluating a fixed value of an AC filter in a HVDC transmission system. The method is characterized in that an initial maximum energy value of the AC filter is calculated according to a current value of steady-state setting of the AC filter; according to preset component parameters of the AC filter and preset system parameters corresponding to the HVDC transmission system, a N-th capacity ratio and a N-th impedance ratio are calculated; a fundamental frequency change function is fitted according to multiple fundamental frequencies detected in advance; a current maximum energy value of the AC filter is obtained according to the fundamental frequency change function, a pre-calculated characteristic harmonic current, the N-th capacity ratio andthe N-th impedance ratio; according to the current maximum energy value and the initial maximum energy value, the fixed value evaluation result of the AC filter is obtained; whether the AC filter is suitable for an island operation mode can be determined through accurately evaluating the fixed value of the AC filter, and the amount of calculation for steady-state fixed value evaluation is reduced.
Description
technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a method and device for evaluating the constant value of an AC filter of a high-voltage direct current transmission system. Background technique [0002] The isolated island operation at the sending end of the HVDC transmission system is a special operation mode, which can reduce the impact of power flow transfer on the AC system after a DC trip, and has unique advantages in improving the system stability of long-distance power transmission and increasing the power transmission energy. . In the island operation mode, since the sending end has no electrical connection with the main grid, its short-circuit capacity is smaller than that of the network mode, which makes the interaction between AC and DC more obvious; especially when the DC system is unipolarly blocked, the frequency of the AC system will be greatly reduced. Changes will affect relate...
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IPC IPC(8): H02J3/01H02J3/36
CPCH02J3/01H02J3/36Y02E40/40Y02E60/60
Inventor 辛清明赵晓斌黄莹郭龙胡蓉彭茂兰
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD