Compensation current calculation method for three-level active power filter without harmonic detection control

A power filter, compensation current technology, applied in active power filter, AC network to reduce harmonics/ripple, reactive power adjustment/elimination/compensation and other directions, can solve problems such as inability to apply, achieve convenient control, Low-cost, easy-to-achieve effects

Active Publication Date: 2019-06-11
TAIYUAN UNIV OF TECH
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  • Claims
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Problems solved by technology

For the control strategy with harmonic detection that directly detects the compensation current, this method is convenient and feasible, but the control strategy without harmonic detection does not detect the compensation current, so this method cannot be applied

Method used

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  • Compensation current calculation method for three-level active power filter without harmonic detection control
  • Compensation current calculation method for three-level active power filter without harmonic detection control
  • Compensation current calculation method for three-level active power filter without harmonic detection control

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Embodiment Construction

[0039] The present invention provides a calculation method of a three-level APF compensation current based on no harmonic detection. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] Step 1, such as figure 1 Among them, Sa1, Sa2, Sa3, and Sa4 are the four switching tubes of phase A, and the capacitors C1 and C2 divide the DC side into three levels, that is, the positive level P=u c1 , middle level O=0, negative level N=-u c2 , u c1 Refers to the capacitor C1 voltage, u c2 Refers to the capacitor C2 voltage. The trigger pulse signals of switches Sa1, Sa2, Sa3, Sa4 and their corresponding A-phase port voltages are shown in Table 1. 1 means that the trigger pulse is at high level, that is, the corresponding switch tube is turned on; 0 means that the trigger pulse is at low voltage. Ping, that is, the corresponding switch tube is turned off; for example, 1100 means that Sa1 and Sa2 are turned...

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Abstract

The invention relates to a three-level active electric filter compensation current calculation method based on non-harmonic detection control. An IGBT start pulse signal, a DC side capacitor voltage and a power source voltage are utilized to calculate an inductor voltage, and a compensation current outputted by a three-level active electric filter is further acquired. A cascade signal delay cancellation (CDSC) module is utilized in a calculation process to acquire a compensation current error signal, and calculation accuracy is improved. The whole calculation process is simple and reliable, advantages of non-harmonic detection control are integrated, and the method is suitable for all NPC type and T type topological three-level active electric filters based on non-harmonic detection control.

Description

technical field [0001] The invention relates to the technical field of power electronic device control, and is a method for calculating the compensation current of a three-level active power filter based on harmonic-free detection and control, which can obtain the compensation current of a three-level active power filter without a current sensor. compensation current. Background technique [0002] With the increasingly serious problem of harmonics in the power grid, active power filters as compensation for reactive power and harmonics have been developed rapidly. In industrial production, especially in the field of frequency conversion and speed regulation of high-voltage and high-power AC motors, three-level active power filters It is an ideal harmonic compensation device. Most of the existing three-level active power filters are based on the harmonic detection method, but this method has a large amount of calculation and a phase delay, which will eventually affect the com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1821H02J3/1842Y02E40/20
Inventor 孟润泉韩肖清陈娟刘映竹李云峰魏明高晗孙宝鑫
Owner TAIYUAN UNIV OF TECH
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