Alternate current network phase change detection and compensation system and method

A phase change and detection system technology, applied in the direction of the phase angle between voltage and current, measuring electrical variables, measuring devices, etc., can solve the problems of power imbalance, damage to the semiconductor devices of the energy conversion system, flow direction, etc. Effects of high voltage stress, avoiding reverse energy flow, mitigating technical problems

Active Publication Date: 2013-05-22
GENERAL ELECTRIC CO
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Problems solved by technology

However, when a transient event or a fault occurs in the power grid, there may be a large phase change in the grid voltage 112, and the q-axis voltage signal 116 is not zero at this time
In this case, due to the slow response speed of the control loop of the PLL device 120, the PLL device 120 may not be able to quickly provide the correct phase information

Method used

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  • Alternate current network phase change detection and compensation system and method
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  • Alternate current network phase change detection and compensation system and method

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[0028] In one aspect, one or more embodiments disclosed in the present invention relate to a phase change detection system, which is used to deal with the occurrence of one or more transient events or transient events or fault conditions caused by power grids. Phase change problem, and can specifically detect the phase deviation signal representing the phase change of the grid voltage. The so-called "transient event or transient event" here refers to one or more events or conditions that cause signal disturbance on the grid side, for example, frequency events or phase events that occur in the grid. More specifically, in one embodiment, the phase change detection system disclosed in the present invention is configured to use the voltage component in the stationary coordinate system to detect or calculate the phase deviation signal. In another aspect, one or more embodiments disclosed herein relate to an instantaneous phase angle generation system that can be used for synchronou...

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Abstract

The invention discloses an alternate current network phase change detection system which comprises a coordinate transformation device and a phase change detection device. The coordinate transformation device receives a one-phase or multi-phase network voltage feedback signal and generates a first voltage component signal and a second voltage component signal under a stationary coordinate. The phase change detection device receives the first voltage component signal and the second voltage component signal, and calculates out a phase deviation signal which represents the phase change which exists in the one-phase or multi-phase voltage feedback signal at least based on the first voltage component signal and the second voltage component signal. The invention further discloses an alternate current network instantaneous phase angle generation system, an energy conversion system, a photovoltaic energy conversion system, a phase change detection method and a phase change compensation method.

Description

technical field [0001] The embodiments disclosed in the present invention relate to an energy conversion system and method, in particular to a system and method for detecting and compensating for phase changes in an AC grid. Background technique [0002] Generally speaking, in an energy conversion system, such as a renewable energy energy conversion system, a phase locked loop (Phase locked loop, PLL) device is usually used to perform synchronous control between the energy conversion system and the power grid. figure 1 A conventionally used phase locked loop arrangement is shown. figure 1 The illustrated PLL device 120 includes a coordinate conversion unit 114 for converting the three-phase grid voltage signal 112 into a d-axis voltage signal (not shown) and a q-axis voltage signal 116 in the d-q coordinate system. The q-axis voltage signal 116 is provided to a summation element 118 , which subtracts the zero voltage command signal 122 from the q-axis voltage signal 116 to ...

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Application Information

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IPC IPC(8): G01R25/00H02J3/38
Inventor 公茂忠谭卓辉邬雪琴朱慧斌大卫.史密斯
Owner GENERAL ELECTRIC CO
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