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Megawatt converter parallel control method and system

A control method and technology for a control system, which are applied in the field of parallel control methods and systems for megawatt converters, and can solve problems such as poor stability of the parallel control methods for converters.

Active Publication Date: 2014-04-09
青岛创统科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor stability of the existing converter parallel control method, the present invention provides a megawatt-level converter parallel control method, which can solve the above problems

Method used

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  • Megawatt converter parallel control method and system

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Embodiment 1

[0026] Embodiment 1, the present invention provides a parallel control method for megawatt-level converters for the current non-connected parallel control using the external droop characteristics of the output voltage and frequency of the converter, and poor stability of the main engine. Wireless communication, but the communication control principle is completely different from the control principle in the prior art, and the host is not fixed, which solves the problem of poor system stability.

[0027] see figure 1 As shown, this embodiment provides a parallel control method for megawatt-level converters, including the following steps:

[0028] S1. Each converter connected to the parallel network sends wireless communication commands to all other converters, and each converter sends a response signal to the communication commands it receives;

[0029] S2. If the number of converters receiving response signals from a certain converter is the same as the number of converters r...

Embodiment 2

[0038]Embodiment 2, based on the parallel control method for megawatt-scale converters in embodiment 1, this embodiment provides a parallel control system for megawatt-scale converters, including several converters connected to the parallel network , each converter is equipped with a control unit, and the control unit of each converter is connected to a wireless communication module. When the parallel control system of megawatt-level converters is connected in parallel, the following control steps are performed:

[0039] S1. The control unit of each converter sends wireless communication commands to all other converters through the wireless communication module, and each converter sends a response signal through the wireless communication module to the communication commands it receives;

[0040] S2. The control unit of each converter compares and judges the received response signal, if the number of converters receiving the response signal is the same as the number of converte...

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Abstract

The invention discloses a megawatt converter parallel control method and system. The megawatt converter parallel control method comprises the steps that (1) a converter is used for sending wireless communication commands to other all converters and giving out response signals specific to received communication commands; (2) if the converter amount of the response signals received by a certain converter is identical with the converter amount of the response signals received by other converters, the certain converter is added to a parallel operation sequence, otherwise, the certain converter cannot be added to a parallel operation sequence; and (3) the converter added to the parallel operation sequence is used for simultaneously outputting alternating currents, when the alternating currents pass zero, the converter gives out zero passage signals, and the converter giving out the zero passage signals in the first place is used as a main machine. The control method disclosed by the invention has the advantages that the main machine has randomness, and the problems of external droop characteristics caused by using the converter for outputting voltage and frequency in a conventional non-connecting wire type parallel control method and poor fixation and stability of the main machine are solved.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a parallel control method and system for megawatt-level converters. Background technique [0002] Due to the limited capacity of a single converter, it is currently unable to meet the power demand of megawatt-level shore power. If the parallel connection of converters is adopted, it can have many advantages such as expansion and improved maintainability. In the case of high reliability, the parallel connection technology of converters has great advantages. The parallel control methods of converters mainly adopt wired connection parallel control and wireless connection parallel control. Among them, wired connection parallel control includes centralized control, master-slave control, and distributed control. At present, wired connection parallel control mainly The existing technical problem is: centralized parallel control, because the output voltage phase of ea...

Claims

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Application Information

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IPC IPC(8): G05B19/042
Inventor 郜克存隋学礼
Owner 青岛创统科技发展有限公司
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