A Multimode Repetitive Controller Considering Grid Frequency Deviation

A repetitive controller and repetitive control technology, applied in the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problems of tracking control harmonic performance degradation, etc., to improve tracking control and compensation effects, improve Stability, the effect of improving steady-state accuracy

Active Publication Date: 2017-10-24
WUHAN UNIV
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Problems solved by technology

[0008] Aiming at the problem that the harmonic performance of the repetitive controller tracking control decreases when the frequency of the power grid deviates, the present invention proposes an improved repetitive controller, which takes the deviation of the grid frequency into consideration in the design of the controller

Method used

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  • A Multimode Repetitive Controller Considering Grid Frequency Deviation
  • A Multimode Repetitive Controller Considering Grid Frequency Deviation
  • A Multimode Repetitive Controller Considering Grid Frequency Deviation

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Embodiment Construction

[0029] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0030] figure 1 Shown is the structural diagram of the multi-mode repetitive controller considering the grid frequency deviation proposed by the present invention, including:

[0031] A proportional control channel: take the harmonic command e as the input quantity;

[0032] A plurality of repeated control channels connected in parallel: take the harmonic command e as the input quantity, the output quantity of the repetitive control channel is connected to the second adder at the same time, the accumulated output quantity is connected to the first adder and the output quantity of the proportional control channel is accumulated, Obtain the comprehensive output of the multimode repetitive controller;

[0033]Wherein, multiple repeated control paths in parallel are composed of multiple control paths with the same structure, and each control path incl...

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Abstract

The invention relates to a multi-mode repetition controller considering power grid frequency offset; the controller comprises a repetition control gain module, a frequency offset adjusting module, an adder, a feedback attenuation module, a time-delay link and proportion control gain module. The method uses a proportion control passage and a plurality of mutually parallel repetition control passages to form composite control, and can track a harmonic wave instruction with no static difference under a power grid frequency offset condition. The advantages are that the method can enlarge frequency band width of the controller close to a nominal frequency point, thus improving quality factor, improving controller harmonic wave tracking control performance under the power grid frequency offset condition, and improving repetition controller robustness against the power grid frequency offset.

Description

technical field [0001] The invention proposes a multi-mode repetitive controller considering the grid frequency deviation, the main applicable object is an active power filter, which is used to suppress load harmonics in the grid frequency deviation working condition, and belongs to the field of power quality in electrical engineering. Background technique [0002] In the field of harmonic suppression of power quality, the control objects are harmonic currents of several times, ten times, and tens of times. Ordinary PI controllers have a narrow bandwidth, resulting in a poor effect of tracking and controlling harmonics. Adding a delay feedback branch and other auxiliary branches to the forward channel of the control system can effectively track the periodic external excitation signal similar to harmonics, and track the periodicity corresponding to the working frequency or multiples of the working frequency without static error. signal, which is the basic principle of applyi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 刘飞姚俊涛王毅冯锟黄长亮查晓明
Owner WUHAN UNIV
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