A hierarchical control method and system for cascaded rectifiers

A layered control and rectifier technology, applied in the output power conversion device, the conversion of AC power input to DC power output, the conversion of irreversible AC power input to DC power output, etc. The problem of abnormal operation of the connected rectifier and affecting the reliability of the system can reduce the communication cost of the system, facilitate flexible expansion, and improve the reliability of the system.

Active Publication Date: 2021-01-19
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0004] In addition, due to the large amount of collected information, especially in the case of a large number of UHV cascaded modules, the centralized controller is required to have very powerful processing capabilities, thus limiting the application scale of the existing cascaded rectifiers
At the same time, since a centralized controller manages all sub-modules, when there is communication packet loss or delay in a single sub-module, it is easy to cause abnormal operation of the entire cascaded rectifier
Due to the existence of the single point of failure problem, the reliability of the overall system is greatly affected

Method used

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  • A hierarchical control method and system for cascaded rectifiers
  • A hierarchical control method and system for cascaded rectifiers
  • A hierarchical control method and system for cascaded rectifiers

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Embodiment Construction

[0059] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0060] like figure 1 , which shows a hierarchical control structure block diagram of a cascaded rectifier system according to an embodiment of the present invention.

[0061] The upper controller is respectively connected with multiple lower controllers through communication links. Each bottom controller is locally hard-wired to each sub-module in the cascaded rectifier system. The voltage input of each sub-module is controlled by the correspondingly connected underlying controller. Then, the entire cascaded rectifier system is integrated into the grid of the power system by sending a startup command through the upper controller.

[0062] As mentioned above, the control system of the present invention is divided into two layers in terms of th...

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Abstract

The invention discloses a layered control method for a cascaded rectifier, which comprises the following steps: generating an initial parameter group for starting the cascaded rectifier system in an upper controller; The parameter set is transmitted to each bottom controller for controlling each sub-module in the cascaded rectifier system via a communication link; in each bottom controller: a PWM initial modulation signal is generated based on the received initial parameter set and used as Control instructions are sent to each sub-module in real time to start the cascaded rectifier system to work, and at the same time collect the voltage and current of the front-end input and rear-end output of each sub-module after being started; The calculation is controlled to obtain a PWM real-time modulation signal, and the PWM real-time modulation signal is used to control the voltage input of the correspondingly connected sub-module.

Description

technical field [0001] The invention relates to the field of power electronic system control, which is applied to the energy Internet, high-voltage distribution network, and electrified railway traction industry, and specifically relates to a layered control method and system for cascaded rectifiers. Background technique [0002] As the front-end rectification link of power electronic transformers and energy routers, cascade rectifiers are widely used in electrified railway traction occasions and energy Internet industries. , this cascaded rectifier has the advantages of modularization, easy expansion, and simple structure. [0003] In medium and high voltage cascaded rectifiers, coordinated control among sub-modules is crucial. In existing research, there are mainly two control methods, unified modulation and model prediction, both of which are based on a centralized framework to accomplish all control objectives. In this case, a centralized controller is needed to collec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
CPCH02M7/219H02M1/007H02M1/32H02M1/36H02M7/25H02M1/0074
Inventor 孙尧侯小超韩华粟梅王辉刘永露熊文静
Owner CENT SOUTH UNIV
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