PWM rectifier harmonic suppression system
A rectifier and harmonic technology, applied in the field of PWM rectifier harmonic suppression system, can solve the problems of PI regulator unable to track AC components, aggravating grid unbalance, unable to meet PWM rectifier harmonic requirements, etc.
Inactive Publication Date: 2019-03-26
GUANGDONG MIDEA WHITE GOODS TECH INNOVATION CENT CO LTD +1
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At the same time, since the power grid itself will have harmonics of 5, 7, 11, and 13, under the d-q two-phase orthogonal coordinates, the voltage harmonics appear as AC components, and the traditional PI regulator cannot track the AC components due to bandwidth limitations. Therefore, there will be 5th and 7th current harmonics with large amplitudes in the current
[0004] On the other hand, in places where there are many load devices such as factories, schools, shopping malls, etc., if there are unbalanced loads with large capacity or lack of reactive power control devices in the power grid, the unbalance of the power grid will be aggravated, and the unbalanced power grid will cause The input side current of the rectifier contains the 3rd harmonic and the bus voltage contains the double frequency component
[0005] Therefore, under the influence of many factors, the input current of the PWM rectifier will have rich harmonics, which cannot meet the harmonic requirements of the PWM rectifier on IEEE519-92
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[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0021] The terms "first", "second", and "third" in this application are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least t...
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The invention discloses a PWM rectifier harmonic suppression system. The system includes a current regulation module consisting of a current regulator and an adder. The current regulator includes a PIregulator, a repetitive controller and a resonant controller. The PI regulator is used for tracking the fundamental current in the current and obtaining a first component of the output voltage. The repetitive controller is used for tracking the six-fold frequency component in the current to suppress (6*n+1) harmonic and obtaining a second component of the output voltage. The resonant controller is used for tracking the double frequency component in the current to suppress third harmonic and obtaining a third component of the output voltage. The adder is used for superimposing the first component of the output voltage, the second component of the output voltage and the third component of the output voltage to obtain the output voltage. Through the scheme, the (6*n+1) harmonics such as fifth and seventh harmonics caused by the grid voltage and the dead-time effect and the third harmonic caused by grid imbalance can be simultaneously suppressed.
Description
technical field [0001] The present application relates to the technical field of power electronics, in particular to a harmonic suppression system of a PWM rectifier. Background technique [0002] With the rapid development of society, electric energy plays an increasingly important role in industrial and agricultural production and people's daily life. However, at the same time, power electronic conversion devices closely related to national production and life, such as frequency converters and high-frequency switching power supplies Various converter devices such as inverter power supply have brought a large amount of reactive power and serious harmonic pollution to the power grid in a wide range of applications. With the development of power electronics technology, PWM rectifiers emerged as the times require, successfully replacing uncontrollable diode rectifiers and phase-controlled thyristor rectifiers, and becoming a hot spot in power electronics technology research. ...
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Login to View More IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 姜凯宾宏
Owner GUANGDONG MIDEA WHITE GOODS TECH INNOVATION CENT CO LTD