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Harmonic current suppression method and device of flexible direct current converter and storage medium

A flexible DC and harmonic current technology, applied in harmonic reduction devices, circuit devices, and AC networks to reduce harmonics/ripples, etc., can solve complex parameter design, difficult to use, and affect the dynamic performance of flexible DC converters and steady-state characteristics, to achieve the effect of harmonic current and small calculation amount

Active Publication Date: 2021-09-28
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

However, this suppression strategy involves complex parameter design, and may affect the dynamic performance and steady-state characteristics of the flexible DC converter. After the implementation of the suppression strategy, a large number of dynamic performance test verifications are required, and it is difficult to apply it in actual projects.

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  • Harmonic current suppression method and device of flexible direct current converter and storage medium
  • Harmonic current suppression method and device of flexible direct current converter and storage medium
  • Harmonic current suppression method and device of flexible direct current converter and storage medium

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Embodiment Construction

[0028] 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 creative efforts fall within the protection scope of the present invention.

[0029] see figure 1 , figure 1 It is a schematic flowchart of a preferred embodiment of a harmonic current suppression method for a flexible DC converter provided by the present invention. The harmonic current suppression method of the flexible DC converter includes:

[0030] S1, obtain the order of the harmonic to be suppressed and the amplitude and phase of the background harmonic in the grid voltage;

[0031] S2. After the background harmonic is phase-delayed...

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Abstract

The invention discloses a harmonic current suppression method and device of a flexible direct current converter and a storage medium. The harmonic current suppression method of the flexible direct current converter comprises the steps of obtaining the number of harmonic waves to be suppressed and the amplitude and phase of background harmonic waves in power grid voltage; performing phase delay on the background harmonic waves to generate a harmonic wave adjusting quantity; connecting a harmonic wave trap in series with a current inner loop control output end of the flexible direct current converter to obtain a modulation wave processed by the harmonic wave trap; and superposing the harmonic wave adjusting quantity on the modulation wave processed by the harmonic wave trap so as to suppress the harmonic current of the flexible direct current converter. According to the embodiment of the invention, an original control ring structure does not need to be changed, the calculation amount is small, and the harmonic current can be suppressed under the condition that the influence on the dynamic performance and the steady-state characteristic of the flexible direct-current converter is reduced.

Description

technical field [0001] The present invention relates to the technical field of flexible direct current converters, in particular to a method, device and storage medium for suppressing harmonic currents of flexible direct current converters. Background technique [0002] Flexible DC transmission technology has the advantages of flexible control, high-quality output waveform, and power supply to passive systems. At present, it has been widely used in large-scale long-distance high-voltage DC transmission, new energy grid connection, offshore wind power DC transmission, and asynchronous grid interconnection. application. However, when there are background harmonics in the grid voltage, it will cause the flexible DC converter to generate harmonic currents, which will endanger the safe and stable operation of the flexible DC converter. Therefore, it is necessary to propose an effective harmonic Surge current suppression measures. [0003] The existing technology mainly achieves...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/36
CPCH02J3/01H02J3/36H02J2003/365Y02E60/60Y02E40/40
Inventor 邹常跃颜永光赵晓斌伍双喜冯俊杰魏焱辛清明于珍卢毓欣林燕群杨双飞罗文博
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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