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Power grid phase detection system and method

A phase detection and voltage detection technology, applied to the phase angle between voltage and current, measuring devices, measuring electrical variables, etc., can solve problems such as delay, optimal parameter change, and complicated methods, so as to reduce influence and simplify parameters The process of setting, the effect of strong inhibition

Inactive Publication Date: 2018-06-12
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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Problems solved by technology

[0003] According to the requirements of phase detection overshoot and response time, the regulator parameters can be determined by the method of "pole configuration"; but it will be affected by the voltage amplitude of the grid, and the optimal parameters under different voltage amplitudes will change
[0004] Feedforward filtering of the sampled voltage will cause a phase delay, and phase detection needs to be compensated; when extracting each frequency component of the voltage, the decoupling control will increase the order of the state observer, the method is complicated, and the control is difficult

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  • Power grid phase detection system and method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] refer to figure 1 As shown, as the first embodiment, the present invention discloses a grid phase detection system, which includes a sequentially connected grid phase voltage detection link 1 for inputting the three-phase voltage obtained by sampling from the grid; a low-pass filter link 2 for Suppression of high-frequency harmonic signals in the power grid; notch link 3, used to absorb specific low-frequency harmonic signals in the grid; amplitude detection link 4, used to detect the voltage amplitude of the grid; also includes phase-locked loop link 5, used In order to reduce the impact of each frequency harmonic signal in the power grid on the phase detection results; the low-pass filter link 2 and the notch link 3 are embedded in the phase-locked loop 5, and the low-pass filter link 2 is a cut-off frequency that can be An adjustable first-or...

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Abstract

The invention discloses a power grid phase detection system. The system comprises a voltage detection link, a lowpass filtering link, a notch link, and further comprises an amplitude detecting link, and the lowpass filtering link and the notch link are embedded in a phase-locked loop; the invention further includes a phase detection method. According to the system and the method, through the embedded lowpass filtering link and notch link, low-frequency, medium-high-frequency harmonic components of power grid voltage are suppressed and the process of controller tuning is simplified without considering the influence of phase delay.

Description

technical field [0001] The invention belongs to the field of signal detection, and in particular relates to a grid phase detection system and method, which is suitable for places where grid voltage frequency and phase need to be detected, and is especially suitable for the fields of grid harmonic control and new energy grid access. Background technique [0002] The research on phase detection of power grid mainly focuses on improving the dynamic response characteristics and harmonic suppression ability of phase detection. Among them, setting appropriate regulator parameters, increasing sampling calculation frequency and other measures can improve the speed of phase detection response in the case of grid voltage mutation; through feedforward filtering and decoupling control of sampling voltage, the extraction of each frequency component of grid voltage can be realized , and then use the extracted positive sequence components to obtain the grid phase information. [0003] Acc...

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Application Information

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IPC IPC(8): G01R25/00
Inventor 何忠祥贾志强朱磊李争光谢佩韦
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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