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Second harmonic-based hybrid active power filter device control strategy

A control strategy and second harmonic technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve the problem of high cost of large-capacity active filters, inability to filter continuous frequency band harmonics, Control complexity and other issues to achieve the effect of low implementation cost, simple structure, and reduced control difficulty

Active Publication Date: 2016-12-21
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The advantage of a passive filter is that it can provide reactive power compensation and suppress a certain harmonic for the system, and it is easy to maintain and operate stably; its disadvantage is that it cannot filter out wide continuous frequency band harmonics, and inevitably causes side lobe amplification
The advantage of the active filter is that it can dynamically suppress harmonics and compensate reactive power, and has a fast response speed, effectively avoiding circuit resonance, etc.; its disadvantage is that it is limited by the voltage and current levels of the current fully-controlled power electronic switch, and the large-capacity active filter High cost and complex control

Method used

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  • Second harmonic-based hybrid active power filter device control strategy
  • Second harmonic-based hybrid active power filter device control strategy
  • Second harmonic-based hybrid active power filter device control strategy

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Embodiment Construction

[0045] A control strategy based on a second harmonic hybrid active filter device, characterized in that: by analyzing the influence of various control strategies on the circuit, an optional control strategy is initially drawn up, and the system stability and dynamics under the selected control strategy are measured Performance, introduce control correction link, optimize control strategy, check system impedance frequency characteristics and current amplification curve, verify the filtering effect of the system to determine the control strategy.

[0046] Depend on figure 1 It can be seen from the schematic diagram of the example shown that the control strategy of the present invention is obtained by multiplying the difference between the harmonic current injected into the branch and all the load harmonic source currents through the band-pass filter link and multiplied by a proportional multiple K The current value is injected into the circuit as a controlled current source. Co...

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Abstract

The invention discloses a second harmonic-based hybrid active power filter device control strategy. The control strategy particularly comprises the following steps: various different control strategies are analyzed, and a selectable control strategy is decided initially; the system stability and the dynamic performance under the selected control strategy are measured; a control correction link is introduced, and the control strategy is optimized; system impedance frequency characteristics and a current amplification curve are checked; and the filter effects of the system are verified, and the control strategy is determined. Based on the circuit characteristics of the second harmonic-based hybrid active power filter device, the filter performance, the stability and the dynamic performance of the control strategy are discussed. After the control strategy of the invention is adopted, the control correction link order of the control system is greatly reduced, the complexity degree of the controller is simplified, the second harmonic at a power grid side and surrounding inter harmonic current can be effectively restrained, and the stability of the power system is further improved.

Description

technical field [0001] The invention relates to the field of harmonic control, in particular to a control strategy for a hybrid active filter device for suppressing second harmonics and surrounding harmonics. Background technique [0002] With the rapid development of power electronics technology, the load characteristics and operation modes of modern power devices are more complicated. Some nonlinear, impulsive and unbalanced loads, such as large electric arc furnaces, rolling mills, etc., often need to achieve rapid changes in voltage and current. Rapid changes in value and phase, rectifier transformer DC bias and dynamic harmonic coupling of AC and DC networks, etc., usually excite low-order harmonic resonance on the AC side, such as the formation of larger 2nd harmonics and their surrounding harmonics . The national standard GB / T14549-1993 "Power Quality-Public Grid Harmonics" clearly stipulates the 2nd harmonic voltage limit of the public grid and the allowable value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 傅鹏卢晶李俊茆华风吴亚楠许留伟陶骏
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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