A three-phase four-switch active power filter and its control method

A three-phase four-switch, power filter technology, applied in active power filtering, AC network to reduce harmonics/ripples, reactive power adjustment/elimination/compensation, etc., can solve errors, difficult control, control Problems such as model blur

Inactive Publication Date: 2016-03-30
CENT SOUTH UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In the traditional control theory of active power filter, the control theory of linear system is relatively mature, and there are certain methods for dealing with nonlinear system, but the effect is still unsatisfactory, and the method is relatively complicated
For control models that are fuzzy or have serious uncertainties, traditional control methods are difficult to control them
Moreover, due to the delay of sampling and calculation, and other reasons, there must be an error between the current sent by the APF and the required compensation current

Method used

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  • A three-phase four-switch active power filter and its control method
  • A three-phase four-switch active power filter and its control method
  • A three-phase four-switch active power filter and its control method

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Embodiment

[0109] Such as Figure 4 As shown, the main parameters of the system are as follows: the three-phase power line voltage is 380V, the frequency is 50Hz, the load is a three-phase uncontrollable rectifier circuit with resistance load, the resistance value is 10Ω, and the inductance value is 5mH. The switching device of APF is IGBT, the switching frequency is 6.4kHz, the DC side capacitance value is 10000uF, the DC side voltage reference value is 60V, and the inverter output reactance is 0.2mH.

[0110] figure 2 The acquisition algorithm of the reference harmonic compensation current shown and image 3 The shown incremental PID control methods based on two-dimensional subordinate cloud are all implemented in the DSP controller, and the obtained output results are modulated as a sinusoidal pulse width modulator to generate trigger signals for each switch in the inverter.

[0111] Figure 5 is the compensation result under the steady state of the load. Before the three-phase f...

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Abstract

The invention discloses a three-phase four-switch active electric power filter and a control method thereof. The active electric power filter comprises an inverter. The inverter comprises two switch arms and a DC capacitive branch. The two switch arms and the DC capacitive branch are connected in parallel. The two switch arms are respectively composed of two power switches which are connected in series. The inverter is parallelly connected between a three-phase electric network and a three-phase load through an output wave filter. The control method is an increment type PID control method based on a two-dimensional subordinated cloud model. The two-dimensional subordinated cloud module is utilized for performing on-line adjustment on proportion coefficient, integral coefficient and differential coefficient of an increment type PID controller, thereby improving response performance of a control system. The three-phase four-switch active electric power filter can perform dynamic real-time treatment on each sub-harmonic current and wattless current, thereby greatly improving compensation performance of the system, saving cost, and realizing higher engineering practicability.

Description

technical field [0001] The invention relates to a power filter and a control method, in particular to a three-phase four-switch active power filter device and its incremental PID control method based on a two-dimensional subordinate cloud model. Background technique [0002] Electric energy is an indispensable and important energy source in modern society. The sustainable development of electric power has become the basis for realizing the sustainable development of society and economy, and plays an important balancing role in the coordinated development of society, economy, energy and environment. In recent years, with the increasing number of nonlinear loads such as rectifiers, frequency converters, and electrified railways in the distribution network, power quality problems such as current waveform distortion, voltage fluctuation, and three-phase imbalance have become increasingly serious. How to make full use of the characteristics of active power filters to dynamically ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/20
Inventor 黎燕
Owner CENT SOUTH UNIV
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