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Control algorithm for single-phase unified power quality regulator

A technology of power quality and control algorithm, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as poor compensation and insufficient UPQC research, and achieve simple and easy detection and control parameter setting Simple, real-time effect

Inactive Publication Date: 2016-06-15
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0003] However, the existing research on UPQC is not perfect enough, and there are the following shortcomings:
[0004] (1) At present, most of the research on UPQC is based on three-phase power transmission and distribution systems, and there are relatively few studies on single-phase systems; most of the user side is single-phase systems. With the development of science and technology and the improvement of people's living standards , modern intelligent and highly automated electrical equipment puts forward higher requirements for power quality, so it is necessary to study UPQC for single-phase systems
[0005] (2) Due to the existence of the neutral line of the power grid, when the current and voltage are unbalanced, some shortcomings of the three-phase structure cannot be well compensated
[0006] (3) The harmonic detection methods of the three-phase system are relatively mature, and a complete theoretical system has been formed. How to apply these method theories to the single-phase system, or find a harmonic detection method suitable for the single-phase system, these Points There is no precedent for prior research

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  • Control algorithm for single-phase unified power quality regulator
  • Control algorithm for single-phase unified power quality regulator
  • Control algorithm for single-phase unified power quality regulator

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Embodiment 1

[0031] The present invention provides a single-phase unified power quality regulator control algorithm, such as figure 1 , 2 , 3, its specific implementation process includes the following steps:

[0032] Step 1: Use the digital phase-locked loop to obtain the phase-locked angular frequency ω, and the phase-locked angle θ=ωt;

[0033] Step 2: Desired voltage from the load side Multiply with sinθ (the angle θ obtained in step 1) to get u 1 , u 1 and single-phase grid voltage u S Subtract to obtain the command value of the harmonic voltage

[0034] Step 3: The voltage u across the filter capacitor on the UPQC series side filter capacitor at time k obtained through data acquisition c (k), and command value After the subtraction, it enters the digital PI controller and compares it with the triangular carrier to generate the modulation signal of the single-phase full-bridge inverter unit on the series side;

[0035] Step 4: Generate the driving pulse of the single-phase...

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Abstract

The invention provides a control algorithm for a single-phase unified power quality regulator, which detects a compensation load terminal voltage and inhibits a power voltage harmonic on the basis of an instantaneous reactive power theory, and has a harmonic current compensation function. The control algorithm constructs a virtual two-phase circuit by a detected single-phase system signal, reconstructs a two-phase orthogonal fundamental wave current signal and achieves decomposition of active and reactive components of a current fundamental wave under a synchronous rotating reference frame; observation and control on the voltage harmonic and the current harmonic are achieved by the harmonic voltage signal and the reconstructed fundamental wave current signal; and the power quality of a single-phase system is improved.

Description

technical field [0001] The present invention relates to a unified power quality regulator, and more specifically, to a single-phase unified power quality regulator control algorithm. Background technique [0002] With the development of modern industry, a large number of non-linear, fluctuating, impulsive and asymmetrical loads and equipment have been put into use, resulting in a large number of power quality problems. Traditional single-function compensation devices are increasingly unable to meet the requirements of power quality improvement. With the improvement of digital information processing technology and the deepening of power electronics technology research, some comprehensive compensation devices have begun to be applied. The Unified Power Quality Conditioner (UPQC) combines the characteristics of parallel and series compensation devices, which can not only suppress voltage, current harmonics and voltage fluctuations, but also compensate reactive current; power q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1857Y02E40/30Y02E40/40
Inventor 张淼黎德良唐雄民袁梓锋
Owner GUANGDONG UNIV OF TECH
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