Global synchronous pulse width modulation self-synchronization method in communication failure state

A communication failure and global synchronization technology, which is applied in the direction of synchronization devices, output power conversion devices, digital transmission systems, etc., can solve the problem of increased loss, the inability to take advantage of the global synchronization pulse width modulation method, and the increase in inverter switching frequency, etc. question

Active Publication Date: 2016-02-17
SHANDONG UNIV
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Problems solved by technology

Although this patent mentions the countermeasures under the failure of communication facilities, the global synchronous pulse width modulation method still cannot work normally at th

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  • Global synchronous pulse width modulation self-synchronization method in communication failure state
  • Global synchronous pulse width modulation self-synchronization method in communication failure state
  • Global synchronous pulse width modulation self-synchronization method in communication failure state

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Embodiment Construction

[0073] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0074] A global synchronous pulse width modulation self-synchronization method in a communication failure state, comprising the following steps:

[0075] The global synchronization unit sends the calculated synchronization signal to frequency f syn Send to each grid-connected inverter, the global synchronization unit can be a separate controller, or a controller in a certain grid-connected inverter, arbitrarily designate a grid-connected inverter as grid-connected inverter 1, This patent takes the controller in the grid-connected inverter 1 as the global synchronization unit as an example for illustration.

[0076] The grid-connected inverter M receives and stores the synchronous signal transmission frequency f syn , and calculate the frequency difference between the crystal oscillator of inverter M and the crystal oscillator of inverter 1 according t...

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Abstract

The invention discloses a global synchronous pulse width modulation self-synchronization method in the communication failure state, and by means of the method, grid-connected inverters can still maintain the global synchronous operation state under the circumstance of communication failure, the states of all the grid-connected inverters are not needed to be changed, and the advantages of the global synchronous pulse width modulation method are given full play. The method comprises the steps that a global synchronization unit sends a synchronizing signal to the grid-connected inverter M and sends the synchronizing signal transmission frequency fsyn to the grid-connected inverter M, and the grid-connected inverter M calculates out the crystal oscillator error between the grid-connected inverter M and the grid-connected inverter 1 according to the synchronizing signal; the grid-connected inverter M sets self-synchronization parameters according to the calculation result; the grid-connected inverter M predicts the moment when the synchronizing signal appears next time according to received delta Tsyn, if the synchronizing signal appears, a communication system works normally, self-synchronization is not needed to be conducted, if the synchronizing signal does not appear, communication system failure occurs, and the grid-connected inverter M conducts self-synchronization.

Description

technical field [0001] The invention relates to a global synchronous pulse width modulation self-synchronization method under communication failure state. Background technique [0002] In recent years, with the continuous deterioration of the environment, renewable energy power generation technology and distributed power generation technology have attracted the attention of all parties. The grid-connected inverter can connect distributed power sources to the AC grid, and is a key device for connecting distributed power sources to the AC grid. Due to the existence of power electronic devices, the output current of the grid-connected inverter contains a large number of high-order harmonics. Various methods for reducing high-order harmonics have been mentioned in existing patents and literature, including increasing switching frequency, filter parameters, filter order, adopting interleaved parallel structure, multi-level structure, etc., but these methods will increase inverte...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M1/092H04L7/00
CPCH02J3/38H02M1/092H04L7/00
Inventor 高峰许涛
Owner SHANDONG UNIV
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