DC side capacitance voltage control method for star-shaped chained active power filter

A voltage control method and power filter technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve problems such as less application research

Active Publication Date: 2016-02-17
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Application Information

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At present, there are few researches on the appli

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  • DC side capacitance voltage control method for star-shaped chained active power filter
  • DC side capacitance voltage control method for star-shaped chained active power filter
  • DC side capacitance voltage control method for star-shaped chained active power filter

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Embodiment Construction

[0068] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0069] Before describing the DC side capacitor voltage control method of the star chain active power filter of the present invention, the topology diagram, mathematical model and power of the three-phase chain APF are analyzed as follows:

[0070] Such as figure 1 As shown, the main circuit of the three-phase chained APF is as follows figure 1 shown. After the single-phase H-bridge power units are cascaded, they are connected to the system bus through connecting reactors. The structure of each power unit is exactly the same, and they are all single-phase full-bridge circuits using IGBTs. The energy storage element on the DC side is a capacitor. figure 1 in, u sa , u sb , u sc Indicates the connection point phase voltage, u sab , u sbc , u sca is the corresponding line voltage; i sa i sb i sc Indicates the bus current; u fa , u fb...

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Abstract

The invention discloses a DC side capacitance voltage control method for a star-shaped chained active power filter. The DC side capacitance voltage control method comprises three layers of control. The first layer control is three-phase overall DC voltage control and comprises the steps that positive and negative sequences as well as harmonic components of voltage and current are separated through a cross decoupling filter, and independent control of fundamental wave active-reactive components of the chained APF as well as grid voltage feedforward control are achieved by utilizing power decoupling control. The second layer control comprises the step of adjusting active distribution of various phases of current conversion chains through injecting a zero-phase fundamental wave voltage into various phases of reference voltages, so as to achieve phase-to-phase DC voltage control. The third layer control adopts parallel compound type fuzzy control, compensates current effective value and power unit DC side voltage deviation according to the chained APF, adjusts gain of the controller, and achieves equilibrium control of DC side voltage of an intra-phase power unit. The DC side capacitance voltage control method can improve the DC side voltage stability of devices under non-ideal voltage conditions, and achieves the stable and equilibrium control of the DC side voltage of the chained APF under asymmetric working conditions.

Description

technical field [0001] The invention mainly relates to the technical field of high-power electric power electronics, in particular to a method for controlling the DC side capacitor voltage of a star chain type active power filter. Background technique [0002] Active power filter (ActivePowerFilter, APF) is considered to be the most promising way to implement harmonic control, negative sequence and reactive power compensation. APF is usually divided into two basic structures: parallel type and series type. Due to the convenience of installation and maintenance, shunt active power filters dominate in practical applications. [0003] The chain-type multilevel converter can directly output high voltage without connecting a transformer, the output voltage spectrum characteristic is very good, the voltage stress of the switching device is small, and it is easy to realize the modular design. Through the use of carrier phase-shifted sinusoidal pulse width modulation (CarrierPhase...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 曹洋仇乐兵徐万良唐建宇彭勃林丽黄燕艳罗仁俊吴强周方圆张杰龙礼兰秦灿华陈孟君龚芬刘永丽邓明邱文俊吕顺凯
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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