A control method and device for a parallel active power filter device
A technology of power filtering and control methods, applied in active power filtering, AC networks to reduce harmonics/ripples, etc., can solve problems such as zero-sequence circulating current, and achieve the effect of reducing zero-sequence circulating current
Active Publication Date: 2020-06-16
HENAN SENYUAN ELECTRIC CO LTD
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[0005] The object of the present invention is to provide a control method and device for a parallel active power filter device, which is used to solve the problem of zero-sequence circulating current in the existing parallel active power filter device
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[0046] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0047] A control system of a parallel active power filter device of the present invention, such as figure 1 As shown, it includes a main topology circuit, a controller circuit and a drive circuit. The main topology circuit includes two sets of PWM converters. The PWM converters are composed of two sets of I-type three-level circuits connected in parallel. The two sets of converters The DC side shares a set of DC capacitors.
[0048] The controller circuit includes a sampling circuit, a PWM output circuit and a communication circuit. Among them, the sampling circuit mainly includes the load side sampling circuit, the system voltage sampling circuit, the output current sampling circuit of two sets of PWM converters, the DC bus side voltage sampling circuit of one set of PWM converters and the IGBTs of two sets of PWM converters. Temperature ...
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The invention relates to a parallel active power filter device control method and device. The method is characterized by obtaining three-phase modulation wave of parallel active power filter devices;collecting zero-sequence circulating current between the parallel active power filter devices; according to the zero-sequence circulating current, determining a zero-sequence voltage distribution coefficient; according to the three-phase modulation wave and the zero-sequence voltage distribution coefficient, calculating modulation wave modulation amount; and superposing the modulation wave modulation amount to the three-phase modulation wave to carry out carrier modulation. The method and device can effectively solve the problem of circulating current existing in parallel operation of two or more active power filter devices in the prior art, thereby improving harmonic compensation effect, and reducing size of the device and cost of the device to some degree.
Description
technical field [0001] The invention belongs to the technical field of power system power quality control, and in particular relates to a control method and device for a parallel active power filter device. Background technique [0002] With the development of industrial technology and the increase of nonlinear loads in the power system, the harmonics generated by various nonlinear loads will not only reduce the transmission and utilization efficiency of the grid system, endanger the safe operation of the grid, but also affect the electrical equipment in the grid normal work. As an effective means of harmonic control, the active power filter device has been widely used and achieved good results. [0003] At present, there are two main design schemes of APF (active power filter): the first is the integrated design, which is popular in the early days of APF, although it can filter out multiple harmonics and higher harmonics , but its cost is high and its volume is large, whi...
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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 王季琴齐红柱陈斌张紫阳
Owner HENAN SENYUAN ELECTRIC CO LTD