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PI adaptation based compound control method for active power filter

A power filter, composite control technology, applied in active power filter, AC network to reduce harmonics/ripples, etc., can solve the problem of lack of harmonic current tracking ability, current oscillation and inverter instability , to achieve the effect of overcoming the deterioration of the control effect and simplifying the implementation

Inactive Publication Date: 2015-03-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
  • Application Information

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Problems solved by technology

However, the change of inductance value will cause current oscillation and inverter instability, especially in the case of high power applications
Therefore, control methods for bidirectional inverters with wide-range filter inductance changes have been proposed, such as bi-phase modulation digital control, digital predictive current control, etc. Using the above methods, the inverter can track the sinusoidal reference current well, but not Capable of tracking harmonic current

Method used

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  • PI adaptation based compound control method for active power filter
  • PI adaptation based compound control method for active power filter
  • PI adaptation based compound control method for active power filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] figure 1 It is a specific implementation block diagram of active power filter.

[0034] In this embodiment, the internal structure of the active power filter is described first, such as figure 1 As shown, the active power filter mainly includes the main circuit and the control part.

[0035] Among them, the main circuit includes three-level VSC1, LCL filter 2, non-linear load 3. The three-level VSC1 is connected to the power grid through the LCL filter 2, and the non-linear load 3 is directly connected to the power grid, thus forming a complete main circuit of the active power filter.

[0036] The control part includes: load current harmonic detection module 4, DC voltage control module 5, phase-locked loop PLL6, dq0-abc coordinate system transformation module 7, repetitive control module 8, PI controller 9, SPWM modulation module 10, which constitute a The control part of the source power filter.

[0037] The following is a detailed description of the composite control meth...

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Abstract

The invention discloses a PI adaptation based compound control method for an active power filter. According to the method, inductance change of inductors L1 and L2 in an LCL filter is detected in real time, and in combination of the inductance change of the inductors L1 and L2, a control parameter table of a PI controller is inquired, so that control parameters of the PI controller are regulated in real time. The defect that the control effect of the active power filter becomes poorer during inductance change is overcome, and the active power filter is stably controlled and normally works when the inductance changes in a certain range.

Description

Technical field [0001] The invention belongs to the technical field of automatic control, and more specifically, relates to a PI self-adaptive active power filter composite control method. Background technique [0002] With the increasing development of power electronics technology, the widespread use of non-linear loads has further deteriorated the power quality of the distributed grid. As a controllable harmonic current source, the shunt active power filter can well compensate the current harmonics, thereby optimizing power quality. [0003] In the active power filter based on voltage-type PWM converter, a filter is needed to filter out the PWM carrier and sideband harmonics. Normally, the filter is a high-order low-pass filter, such as an LCL filter. However, the change of inductance value will cause current oscillation and inverter instability, especially in high-power applications. Therefore, control methods for bidirectional inverters with a wide range of filter inductance...

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 谢川李凯郑宏邹见效韩涛徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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