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Control method for three phase active electric power filter to output current wave

A power filter and output current technology, applied in active power filter, AC network to reduce harmonics/ripple, harmonic reduction device, etc. Simplify the circuit structure, improve the compensation effect, and improve the stability effect

Active Publication Date: 2009-03-25
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that it has a large amount of calculation and is highly dependent on system parameters.

Method used

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  • Control method for three phase active electric power filter to output current wave
  • Control method for three phase active electric power filter to output current wave
  • Control method for three phase active electric power filter to output current wave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0114] Embodiment: assume as image 3 The parameters of the first inductor 1, the second inductor 2, the first capacitor 3, and the third inductor 4 in the output filter of the active power filter under the 380V three-phase four-wire system are L 1 = 1mH, L 2 = 1mH, C 1 = 10μF, L n = 0.3mH, each bridge arm of the inverter output dead zone equivalent resistance R = 0.6Ω, the sampling time of the control system is 256 points per cycle, and the switching frequency is 6.4kHz.

[0115] For α and β phases, the state feedback matrix F calculated by formula (33) is [0.7871 -0.8252 0.0413], and the feedback matrix L of the state observer of the discrete system represented by formula (38) = [-0.1283 1.8598 5.1111], k=12 in the formula (27).

[0116] For phase 0, the state feedback matrix F calculated by formula (33) is [0.817 -0.8794 0.0606], and the feedback matrix L of the state observer of the discrete system represented by formula (38) = [0.4671 2.0531 9.3494], (27) In the form...

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Abstract

The invention discloses an output current wave shape control method for a triphase Active Power Filter (APF). A T-shaped filter and a current wave shape controller are adopted to control the output current wave shape of the triphase AFT. The output filter for each phrase bridge arm of an inverter is a capacity connected to the middle point of two inductances connected with each other in series, and form a T-shaped structure, namely T-shaped filter; the calculation method for wave shape controlling is conducting Alfa, Beta, Omicron transformations to instruction current of the triphase APF, actual output current and the voltage of the power network, so as to realize decoupling of the wave shape controlling of the abc triphase output current; and respectively conducting pole assignment to the single-phrase system under decoupled Alfa, Beta, Omicron axis system, and correcting the error between the APF actual output current an the instruction current, so as to get instruction voltage of each phrase under the alfa, beta, Omicron axis system; and at last sending the instruction voltage to a space vector modulating module, so as to confirm the on-off signal of each bridge arm switch tube, thereby causing the actual output current of the PFA to accurately track the instruction current.

Description

technical field [0001] The invention relates to a method for controlling the output current waveform of a three-phase active power filter, which can be used for the control of harmonics in an AC power grid and belongs to the technical field of active power filters. Background technique [0002] With the increasing number of nonlinear loads in the power grid, the problem of harmonic pollution control has been paid more and more attention, and has become one of the hot spots in the field of electrical engineering. The active power filter (APF), as a new type of power electronic device that can dynamically suppress harmonics and compensate reactive power, has attracted widespread attention, and many circuit topologies and control methods have emerged. According to the type of power supply, active power filter (APF) can be divided into single-phase APF, three-phase three-wire APF, three-phase four-wire APF and active line conditioner (APLC). Since most industrial loads are thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 刘飞陈轩恕张冰邱进何妍
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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