An 18-pulse rectification system harmonic suppression system and method

A technology of harmonic suppression and pulse rectification, which is applied in the direction of output power conversion devices and electrical components, can solve the problems of system volume and capacity increase, and achieve the effects of small switching loss, low cost, and simple topology

Inactive Publication Date: 2017-07-21
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a harmonic suppression system and method for an 18-pulse rectification system, which solves the problem that the traditional 18-pulse rectification system uses an active filter to compensate harmonic current on the AC side, which increases the volume and capacity of the system

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  • An 18-pulse rectification system harmonic suppression system and method
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  • An 18-pulse rectification system harmonic suppression system and method

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Embodiment

[0047] Embodiment: A method for suppressing harmonics in an 18-pulse rectification system, characterized in that: through a single-phase voltage type inverter, an AC auxiliary square wave voltage is generated to act on the DC side inductance of the main circuit to improve the DC side current waveform, So as to achieve the purpose of suppressing the current harmonics of the grid side.

[0048] figure 1 It is the main circuit topology of the 18-pulse rectification harmonic suppression system, and its component is the 18-pulse rectification transformer. The phase shifting method adopted by the rectifier transformer is Yanbian triangle phase shifting, the specific topology is as follows figure 2 As shown, AO, BO, CO are primary side windings, aA o , bB o , cC o is the phase-shifting winding, A o B o , B o C o 、C o A o As the basic winding, the phase shift is realized by designing the transformation ratio between the phase shifting winding and the basic winding. Assumin...

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Abstract

The invention provides an 18 pulse wave rectification system harmonic suppression system and method, belonging to a rectification system harmonic suppression system and method. A single-phase voltage type inverter is used for generating alternating current auxiliary square wave voltage which is acted on a main circuit direct-current inductor; and the output current waveform of a diode rectifying bridge is improved and the aim of suppressing network-side current harmonics is achieved by a current relation between a primary side and a secondary side of a rectification potential transformer. The 18 pulse wave rectification system harmonic suppression system and method have the advantages that 1, an auxiliary circuit is the single-phase voltage type inverter, the topological structure is simple and the cost is low; 2, the size of the alternating current square wave voltage of the direct-current inductor is controlled so that three three-phase diode rectifying bridges can be used for uniformly dividing load current; meanwhile, the output current of the diode rectifying bridges is linearly ascended and descended so that a direct-current side current waveform is improved; 3, the auxiliary circuit is coupled on a main circuit by the potential transformer; the power of the auxiliary circuit is small and the loss of a power device switch is small; and 4, the network-side current harmonics can be 1.42%, the current waveform is close to sine wave and the power factor is very close to 1.

Description

technical field [0001] The invention relates to a rectification system harmonic suppression system and method, in particular to an 18-pulse rectification system harmonic suppression system and method. Background technique [0002] With the development of industrial technology, power electronic devices are widely used in high-power rectification industry, but its rectification system contains a large number of nonlinear power loads, which brings a lot of harmonic pollution to the power grid, causing a series of problems: (1) Certain components in the harmonics may cause local parallel resonance in the power system, amplifying the harmonic content and causing damage to the capacitor; (2) A large number of harmonics and reactive power occupy a lot of capacity in the system, and also Increase the loss of power in the transmission process, resulting in an increase in system costs; (3) outside the system, harmonics will emit high-power electromagnetic waves of corresponding freque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 耿乙文李舟生王凯郑飞张雪李珊珊方蒽李小强
Owner CHINA UNIV OF MINING & TECH
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