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A Harmonic Voltage Control Method for Active Power Filter

A power filter and harmonic voltage technology, which is applied in the field of active power filter control, can solve the problems of difficult load current, inability to be measured, limited application, etc., and achieve the goals of overcoming difficulties in acquisition, good control performance, and improved convenience Effect

Inactive Publication Date: 2018-08-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

These methods are all controlled based on the detection of load current. However, in the real power grid, the load is highly distributed, and the load current is not easy or cannot be measured, so the application of these methods is relatively limited.

Method used

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  • A Harmonic Voltage Control Method for Active Power Filter
  • A Harmonic Voltage Control Method for Active Power Filter
  • A Harmonic Voltage Control Method for Active Power Filter

Examples

Experimental program
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Embodiment

[0032] figure 1 Is the control block diagram of the active power filter.

[0033] In this example, if figure 1 As shown, the active power filter includes two parts, the main circuit and the control, where, figure 1 The part below the dotted line is the control part.

[0034] The main circuit part is composed of two-level VSI 1, LCL filter 2, and nonlinear load 3. The two-level VSI 1 is connected to the power grid through the LCL filter 2, and the nonlinear load 3 is directly connected to the power grid, thereby forming a complete main circuit of an active power filter.

[0035] The control part includes: PLL phase-locked loop module 4, abc-dq coordinate transformation module 5, DC voltage control module 6, harmonic voltage detection module 7, voltage control module 8, current control module 9, grid voltage feedforward module 10, dq0 - The abc coordinate transformation module 11 and the SPWM module 12 constitute the control part of the active power filter.

[0036] figur...

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Abstract

The invention discloses a harmonic voltage control method of an active power filter, which collects and extracts the harmonic voltage of the common point of the power grid through a harmonic voltage detection module, thus overcoming the defect that the remote load current is difficult to collect and improving the convenience of control In the actual configuration, by adding a voltage control module to the circuit controller, high-voltage harmonic compensation can be realized only with locally measurable feedback signals, and because of the direct harmonic voltage regulation method, providing better control performance.

Description

technical field [0001] The invention belongs to the technical field of active power filter control, and more specifically relates to a harmonic voltage control method of an active power filter. Background technique [0002] In recent years, power electronics technology has developed rapidly, and more and more applications of nonlinear loads have led to increasingly serious harmonic pollution problems in power grids. Therefore, the elimination of harmonic pollution has become an important part of today's electric energy utilization. The active power filter (APF) can realize the dynamic compensation of reactive power and harmonics at the same time. It has the advantages of fast response speed, is not easy to resonate with the grid impedance, and the compensation performance is not affected by the grid frequency change. It has become a harmonic control. important measure. [0003] Chinese invention patent "A Frequency Adaptive Improved Resonance Control Method for Active Powe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1842Y02E40/20
Inventor 谢川梁卫波张刚郑宏邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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