Low-frequency oscillation suppression method for grid-connected converter based on non-cross-feedback virtual impedance
A virtual impedance and low-frequency oscillation technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve the problems of complex low-frequency oscillation and poor suppression effect
Active Publication Date: 2020-11-13
BEIJING JIAOTONG UNIV
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Problems solved by technology
[0003] The traditional means of suppressing low-frequency oscillations in the power system is to install a power system stabilizer (PSS) or improve the interconnection structure of the interconnected grid.
Although the active damping method of grid-connected converters in the prior art can suppress high-order harmonic resonance very well, for new energy grid-connected systems, the effect of suppressing low-frequency oscillations from a few Hz to more than a dozen Hz is still not good.
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[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0040] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understoo...
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The invention provides a non cross feedback virtual impedance-based grid-connected converter low-frequency oscillation suppression method, which comprises steps: non cross feedback virtual impedance and an infinite impulse response filter are introduced to the grid-connected converter containing current loop control, the optimal non cross feedback virtual impedance value is calculated, and based on the optimal non cross feedback virtual impedance value, through a current loop control command i2<*> and output current i2 closed loop control, low-frequency oscillation of the grid-connected converter is suppressed. The method can effectively suppress the low-frequency oscillation of the grid-connected converter, and the dynamic response characteristics of the system are improved while oscillation is suppressed.
Description
technical field [0001] The invention relates to the field of grid-connected converters based on current loop control in new energy systems, in particular to a method for suppressing low-frequency oscillation of grid-connected converters based on non-cross-feedback virtual impedance. Background technique [0002] In recent years, many low-frequency oscillations related to new energy grid integration have occurred around the world, which seriously threaten the safe and stable operation of the power grid and have a negative impact on the further promotion and application of new energy. A number of achievements have been made in the research on the mechanism of low-frequency oscillation with the new energy grid-connected converter as the research object. From the perspective of control, the key control factor that causes the low-frequency oscillation of the grid-connected converter is the current loop. [0003] The traditional means of suppressing low-frequency oscillations in p...
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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/38
Inventor 唐芬李绍阶王玮刘京斗
Owner BEIJING JIAOTONG UNIV