Parallel multi-level active filter device apf grid connection method
A filtering device and multi-level technology, applied in the electrical field, can solve problems such as no grid-connected method, and achieve the effects of high accuracy, easy operation, and simple steps
Inactive Publication Date: 2017-08-04
安徽四方电气技术有限责任公司
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There is no related grid connection method in the prior art
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[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0024] An embodiment of the present invention provides a parallel multi-level active filter device APF grid connection method, which includes the following steps:
[0025] S1: combined with KM2, the power unit group is charged through the anti-parallel diode of IGBT / IGCT / MOSFET / IECT;
[0026] S2: divide KM2, send PWM signal to the power unit group;
[0027] S3: collect system voltage ua, ub, uc and device output voltage va, vb, vc;
[0028] S4: Use the adder to c...
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A parallel multi-level APF (active power filter) grid connection method comprises steps as follows: a KM2 is connected, and a power unit group is charged; the KM2 is disconnected, and PWM (pulse-width modulation) signals are sent to the power unit group; system voltage ua, ub and uc and device output voltage va, vb and vc are collected; S4, the va, the vb and the vc are subjected to operation by the aid of an adding device, Valpha and Vbeta are obtained, the ua, the ub and the uc are subjected to operation, Ualpha and Ubeta are obtained, and when P which is equal to the sum of Ualpha*Valpha and Ubeta*Vbeta is larger than a set value, phase positions and phase sequences of device CT and system CT are correct; the KM2 is connected, and the pulse of a power electronic device is opened after direct-current side voltage is stable; the pulse of the power electronic device is blocked after the direct-current side voltage is stable; a KM1 is connected; the pulse of the power electronic device is opened, and grid connection is finished. The parallel multi-level APF grid connection method has simple steps and is easy to operate, and when the method is used for judging the phase positions and the phase sequences of device output voltage and system voltage, the accuracy is high.
Description
technical field [0001] The invention relates to the field of electrical technology, in particular to a parallel multilevel active filter device APF grid connection method. Background technique [0002] When the power electronic device is connected to the distribution network, in order to make the device work reliably, it is necessary to ensure that the voltage sent by the device before grid connection and the distribution network voltage have the same phase sequence, frequency, voltage, and phase, so as to realize accurate full-step grid connection The impact is small, and the self-adjusting step is convenient. There is no related grid connection method in the prior art. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a parallel multi-level active filter device APF grid connection method, which includes the following steps: [0004] S1: combined with KM2, the power unit group is charged through the anti-pa...
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IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 王敏张茂松金明沙文
Owner 安徽四方电气技术有限责任公司