Comprehensive control method of three-phase power converter

A technology of three-phase power and integrated control, which is applied in the conversion of AC power input to DC power output, output power conversion device, and AC network to reduce harmonics/ripples, etc., which can solve the problem of large number of controls, difficulty in implementation, complex control system

Inactive Publication Date: 2013-07-10
HUNAN UNIV
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Problems solved by technology

However, this kind of frequency division controller must have a controller for each harmonic, so the

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  • Comprehensive control method of three-phase power converter
  • Comprehensive control method of three-phase power converter
  • Comprehensive control method of three-phase power converter

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Embodiment Construction

[0028] Such as figure 1 Shown is the block diagram of the three-phase power converter. The three-phase power converter is composed of three power switch arms, the AC side is connected to the power grid through the filter inductor L, and the DC side is connected to the post-stage load through the DC capacitor C. The three-phase grid voltage is u sa , u sb , u sc , the output current of the three-phase power converter is i Ca i Cb i Cc , the three-phase grid current is isa i sb i sc , the three-phase load current is i La i Lb i Lc .

[0029] Suppose the three-phase grid voltage is:

[0030] u sa = U sin w 1 t u sb = U sin ...

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Abstract

The invention discloses a comprehensive control method of a three-phase power converter. The converter not only can rectify and output energy to a load but also can compensate an adjacent reactive current and an adjacent harmonic current, wherein the reactive current and the adjacent harmonic current are generated by a nonlinear load; a fast tracking control method is put forward aiming at control of the active current and control of the reactive current. A feed forward fundamental wave modulating signal of a system is worked out according to fundamental wave voltage and current relations in a stable state so as to conduct fast tracking control of a fundamental current. Dq transformation of a fundamental wave field is first conducted on tracking errors of the harmonic current. Two kinds of (6k+/-1)-time harmonic waves are transformed into a kind of 6k-time harmonic wave under dq coordinates, and therefore control and compensation of the two kinds of the (6k+/-1)-time harmonic waves of can be achieved only through a 6k-time syntony controller, the number of harmonic controllers is greatly reduced and practicability of a control system is improved.

Description

technical field [0001] The invention relates to the field of fundamental wave current control and harmonic current control of a three-phase power converter, in particular to a comprehensive control method for a three-phase power converter. Background technique [0002] Electric energy is one of the key factors affecting the development of my country's industry, and electric energy conservation will occupy an increasingly important position in the process of building a conservation-oriented society in my country. In recent years, due to the power quality problems such as harmonics and reactive power caused by the nonlinear load of the distribution network, the operation of electrical equipment is disordered, the power factor of transformers and other equipment is low, and the line loss is large, causing problems for power supply and power consumption enterprises. Thanks to the development of power electronics, power conversion and other technologies, the active power filter t...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02J3/01
CPCY02E40/40
Inventor 马伏军罗安肖华根刘月华金国彬熊桥坡何志兴
Owner HUNAN UNIV
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