Rectifier and control method and control system thereof

A control method and rectifier technology, applied in the direction of converting AC power input to DC power output, output power conversion device, harmonic reduction device, etc., can solve the problems of difficult to achieve high power factor, limited observer bandwidth, current harmonic Advanced problems, achieve high power factor, reduce current harmonics, and eliminate errors

Active Publication Date: 2021-10-15
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current schemes without grid voltage sensors, the sensorless control scheme based on the observer is commonly used. Due to the limited bandwidth of the observer, the distortion o

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  • Rectifier and control method and control system thereof
  • Rectifier and control method and control system thereof
  • Rectifier and control method and control system thereof

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Embodiment Construction

[0066] The core of the present invention is to provide a rectifier control method, which can effectively reduce the current harmonics of the rectifier and realize high power factor when there is no grid voltage sensor.

[0067] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] Please refer to figure 1 , figure 1 It is an implementation flowchart of a control method of a rectifier in the present invention, and the control method of the rectifier may include ...

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Abstract

The invention discloses a rectifier and a control method and system thereof, and the method comprises the steps: determining an error between a DC voltage outputted by the rectifier and a DC reference voltage, and determining an expected resistance value needed to be simulated by a rectifier port based on the error; determining harmonic compensation voltage for compensating harmonic according to the power grid current of the input end of the rectifier and the simulated harmonic impedance; according to the equivalent inductance estimation value of the rectifier, determining negative inductance needing to be simulated at the port of the rectifier, and determining an inductance voltage drop compensation value used for compensating the inductance voltage drop of the rectifier through the negative inductance; according to the expected resistance value, the harmonic compensation voltage and the inductance voltage drop compensation value, determining a currently required voltage reference value of a rectifier port so as to modulate PWM pulses and perform driving control of the rectifier. By applying the scheme of the invention, the current harmonic of the rectifier is effectively reduced without a power grid voltage sensor, and a high power factor is realized.

Description

technical field [0001] The invention relates to the technical field of AC and DC power conversion, in particular to a rectifier and its control method and control system. Background technique [0002] As more and more non-linear loads are used, the power quality is getting worse, and the problems of loss and electromagnetic interference tend to be serious. The active rectifier has the advantages of controllable input power factor and sinusoidal input current. It is an effective solution to improve power quality and can improve power quality from the source. [0003] At present, by sampling the grid voltage and grid current, many controllers can well realize the high power factor operation of the rectifier, and realize very good current control under the condition of grid distortion. However, grid voltage sensors and grid current sensors are costly compared to the total cost of the control system. In addition, the solution without a grid voltage sensor is also beneficial to...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/12H02M1/42
CPCH02M7/219H02M1/12H02M1/42H02M1/4233Y02E40/40
Inventor 付刚胡云卿陈欣吴奕彭赟胡景瑜王跃胡亮周振邦唐龙
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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