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Method and device for automatically adjusting phase sequence

An automatic adjustment and phase sequence technology, applied to output power conversion devices, irreversible DC power input to AC power output, electrical components, etc., can solve the delay of the adjustment process, the complexity of the phase sequence adaptive adjustment process, etc. problems, to achieve the effects of enhanced reliability, fast phase sequence automatic adjustment, and improved efficiency

Active Publication Date: 2018-07-10
河南许继电力电子有限公司 +2
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Problems solved by technology

[0005] The invention relates to a method and device for automatically adjusting the phase sequence, which solves the problems in the prior art that the phase sequence adaptive adjustment process is complicated and there is a time delay in the adjustment process

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  • Method and device for automatically adjusting phase sequence

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0026] Such as figure 2 As shown, the present invention provides a method for automatically adjusting phase sequence, comprising the following steps:

[0027] 1) Before the device is put into operation, detect the phase sequence of the three-phase AC voltage input by the inverter;

[0028] 2) When the phase sequence is correct, implement phase-locking and control the start-up of the inverter according to the phase sequence of A, B, and C;

[0029] 3) When the phase sequence is incorrect, automatically adjust the phase locking, realize phase locking according to the phase sequence of A, C, and B, and control the inverter to start according to the phase sequence of A, C, and B.

[0030] Specifically, in step 1), before the device is put into operation, such as figure 1 As shown, the digital phase-locked loop based on synchronous rotation transfor...

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Abstract

The invention provides a method and device for automatically adjusting a phase sequence. The method comprises the following steps of 1) detecting a phase sequence of an inverter input three-phase AC voltage before a device is put into operation; 2) achieving phase locking according to a phase sequence of A, B and C, and controlling an inverter to start and run; and 3) automatically adjusting phaselocking when the phase sequence is not correct, achieving phase locking according to a phase sequence of A, C and B, and controlling the inverter to start and run according to the phase sequence of A, C and B. By the method, the problems of complicated self-adaptive adjustment process of the phase sequence and time delay in the adjustment process are solved.

Description

technical field [0001] The invention relates to a method and device for automatically adjusting phase sequence, belonging to the technical field of converter control. Background technique [0002] Phase sequence is an important component of three-phase AC phase information. Usually, the control of the inverter is designed on the premise that the grid voltage is positive sequence. The correct phase information will not be obtained, an error occurs in the control link, and the device cannot work normally. [0003] When the phase sequence is wrong, the conventional method is to use a phase sequence detector to measure the phase sequence, and then put it into operation after verifying that the phase sequence is positive. In the actual operating environment of the equipment, this method not only increases the economic cost , and the process is cumbersome and error-prone. [0004] For example, in the "Research on Phase Sequence Adaptive Control of Grid-connected Inverters" publi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42
CPCH02M7/42H02M1/0003
Inventor 刘刚胡四全孙健陈北海许恩泽汪海涛李建伟郭寅远刘重洋王青龙翟耀辉
Owner 河南许继电力电子有限公司
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