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Power quality regulator and control method

A control method and power quality technology, applied in AC network to reduce harmonics/ripple, active power filtering, etc., can solve the problem of poor suppression effect, achieve suppression amplification, good harmonic suppression effect, and avoid harmonics. The effect of wave oscillation

Active Publication Date: 2016-08-24
秦皇岛信能能源设备有限公司
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the suppression effect of the resistive active filter becomes worse when the line parameters and installation positions are changed, and proposes a new type of power quality conditioner capable of suppressing the background harmonic amplification of the ring network

Method used

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Embodiment Construction

[0036]Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0037] figure 1 Shown is the lumped parameter model diagram of the power quality conditioner used in the ring line in the present invention, the power quality conditioner extends the line length of the ring transmission line at the harmonic frequency equivalent to wireless length, corresponding to the dotted line part, but has no effect on the circuit structure at the fundamental frequency. In the figure, x represents the equivalent extension length of the loop transmission line at the harmonic frequency by the power quality conditioner, x=x 1 +x 2 And l 1 +x 1 = l 2 +x 2 , point c is the midpoint of the equivalent extended line. According to the transmission line theory, when the length of the transmission line is infinite, there is no reflected wave in the line, so the harmonic amplification on the line can be effectively suppressed.

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Abstract

The invention discloses an electric energy quality regulator and a control method. The regulator is formed by active power filters connected in series, active power filters or passive power filters connected in parallel and transformers and can be formed in two manners of a double-transformer type impedance converter and a single-transformer type impedance converter. The impedance converter can be mounted at any position of an annular power grid, electric parameters of the power grid at the output end of the impedance converter are detected, and directive currents of phases a, phases b and phases c of all the active power filters are obtained according to the electric parameters; then subtraction is carried out on the directive currents and practical output currents of the active power filters, PI control is conducted on the difference value of the directive currents and the practical output currents, then PWM is carried out on the difference value, driving signals of the active power filters are obtained accordingly, and the converter is controlled according to the driving signals. The regulator has the advantages of avoiding harmonic oscillation, effectively suppressing harmonic amplification at each time and the like.

Description

technical field [0001] The invention relates to the field of power regulation, in particular to a power quality regulating device for suppressing background harmonics of a power grid. Background technique [0002] With the popularization and application of power electronic equipment, serious harmonic problems have appeared in industrial and public power distribution systems. The background harmonics of the power grid come from the penetration of the harmonic voltage of the superior power grid on the one hand, and the influence of other harmonic sources of the power grid on the other hand. Regarding the background harmonics, one of the most serious problems is the significant amplification of the harmonic voltage caused by the harmonic resonance between the line inductance and the power factor correction capacitor connected in parallel, causing severe voltage distortion. [0003] At present, the grid harmonics are suppressed by connecting the resistive active power filter R-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 孙孝峰王蕊杨理莉李昕
Owner 秦皇岛信能能源设备有限公司
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