Harmonic selection and capacity limitation control method for active power filter

A power filter and control method technology, applied in active power filter, harmonic reduction device, AC network to reduce harmonic/ripple, etc., can solve problems such as poor real-time performance, complex algorithm, APF overload, etc.
CN103683293AInactive Publication Date: 2014-03-26UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2014-03-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a harmonic selection and capacity limitation control method for an active power filter. The control method comprises the following steps of acquiring load current signals and extracting each sub-harmonics signal of a load; according to each sub-harmonics signal of the load, calculating a current command signal, and then constituting a modulation signal by using the acquired grid voltage, the input current and the direct current side voltage of the active power filter; and finally, generating a PWM switching signal to control a switching tube of the active power filter. The selective harmonic compensation of the active power filter and the capacity limitation running when the capacity of the active power filter is less than the load harmonics can be realized, and the overload running of the active power filter is prevented, so that the performance of the active power filter and the adaptability of the active power filter under complex ad grid conditions can be greatly improved. The control method can adopt C language programming, and can be easily implemented on a DSP chip.
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Description

technical field

[0001] The invention belongs to the technical field of power filter control, and more specifically relates to a control method for harmonic selection and capacity limitation of an active power filter. Background technique

[0002] With the rapid development of power electronics technology and the continuous emergence and maturity of various power electronic devices, flexible AC transmission, high-voltage DC transmission, microgrid and smart grid become possible. The wide application of power electronic devices will also aggravate the power quality problems of the power grid. Therefore, it is of great significance to develop high-performance active power filters to meet the needs of harmonic control. In order to improve the grid adaptability of active power filters, commercialized APFs generally have the functions of output capacity limitation and selective harmonic compensation.

[0003] Chinese invention patent "A Specified Harmonic Compensation APF and It...

Claims

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