Three-phase alternating current (AC) phase sequence detection method and three-phase AC phase sequence detection device for grid-connected equipment
A three-phase alternating current, phase sequence detection technology, applied in the direction of phase sequence/synchronization indication, etc., can solve the problems of misjudgment detection, lag, etc.
Active Publication Date: 2015-05-27
BEIJING ETECHWIN ELECTRIC
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However, the premise of using this method to judge the angular frequency is that the phase of the synchronous coordinate transformation must be accurate. When the phase of the synchronous coordinate transformation provided is wrong, this method will cause misjudgment or detection lag
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[0025] The present invention will be further described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention and implement it.
[0026] The invention provides a three-phase AC phase sequence detection method and detection device for grid-connected equipment, which can be integrated into the control system of grid-connected equipment such as grid-connected frequency converters or converters at no cost, and the detection method is relatively It is simpler and more accurate than the angular frequency detection method. The invention can overcome the shortcomings of the three-phase AC phase sequence detection method and equipment in the prior art, and does not need the phase angle required for synchronous rotation coordinate transformation. The invention is based on the Clarke transformation, that is, the conversion of three-phase alternating current to two-phase alternating current, and then judges whether...
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The invention provides a three-phase alternating current (AC) phase sequence detection method and a three-phase AC phase sequence detection device for grid-connected equipment. The detection method comprises the steps that instantaneous values of three-phase AC values are sampled, the sampled three-phase AC values are subjected to Clarke transformation, instantaneous values of IBeta are subjected to plus-minus judgment within a zero-crossing period of IAlpha, and then the phase sequence of a three-phase AC is determined. The detection device comprises a three-phase AC sampling circuit, a processor and a display module. The invention provides the three-phase AC phase sequence detection method and the three-phase AC phase sequence detection device for the grid-connected equipment. Compared with an angular frequency detection method, the detection method provided by the invention is simpler and more convenient and has the advantages that a detection result is accurate, and the transformation from the three-phase AC to a two-phase AC can be realized on the basis of Clarke transformation without needing phase angles needed by synchronous rotating reference frame transformation. The phase sequence detection device disclosed by the invention can be integrated into a control system of the grid-connected equipment such as a grid-connected frequency converter or a current converter in a cost-free manner.
Description
technical field [0001] The invention is suitable for grid-connected devices and equipment in the field of three-phase alternating current, and in particular relates to a three-phase alternating current phase sequence detection method and a detection device for grid-connected equipment. Background technique [0002] The phase sequence of three-phase AC plays a decisive role in the normal operation of voltage-type equipment such as three-phase motors and grid-connected converters. When the three-phase AC negative sequence is connected to the motor, it will cause the motor to reverse, such as elevators, machine tools and elevators. When the three-phase negative sequence connection is started, the motor will reverse, which may cause personal and property safety. In addition, many grid-connected devices need to rely on the phase of the grid voltage to start and run, such as photovoltaic grid-connected inverters, wind power grid-connected converters, etc. It is difficult for the ...
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IPC IPC(8): G01R29/18
Inventor 赵帅央
Owner BEIJING ETECHWIN ELECTRIC