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
CN105337281AActive Publication Date: 2016-02-17ZHUZHOU NAT ENG RES CENT OF CONVERTERS
5 Cites 10 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
Publication Date
2016-02-17

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More