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Ship electric energy quality monitoring system

A technology of power quality monitoring and power quality, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of unable to monitor multiple nodes of the power grid at the same time, low degree of automation, and few measurement indicators, so as to avoid boundary effects , good real-time performance and strong anti-noise ability

Inactive Publication Date: 2012-07-11
NAVAL UNIV OF ENG PLA
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Problems solved by technology

The disadvantages of this type of instrument are that there are few measurement indicators, poor versatility, low precision, and low degree of automation.
The existing monitors have a good effect on monitoring a single index of a node separately, but there is no way to synthesize multiple index problems into a single quantitative index for power quality evaluation; in addition, it is impossible to monitor multiple nodes of the power grid at the same time, and it is difficult In-depth analysis of root causes affecting power quality and timely understanding of grid power quality levels

Method used

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  • Ship electric energy quality monitoring system
  • Ship electric energy quality monitoring system
  • Ship electric energy quality monitoring system

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[0056] The digital signal processor uses the TMS320F2812DSP chip of Texas Instruments (TI) to collect the power quality data of the nodes in real time. The sensor consists of three current clamps and three voltage test lines with alligator clips. The power quality signal detection uses Hall sensors. , and use a conditioning circuit to standardize its output level. In order to meet the sampling of the 30th harmonic measurement, according to the sampling theorem and the actual engineering requirements, we set the sampling frequency as 6.4kHz, that is, 128 sampling points per cycle.

[0057] The A / D converter is the core device in the analog-to-digital conversion circuit. We choose TI's high-performance A / D chip ADS8364 for the analog-to-digital conversion. The anti-aliasing filter is a low-pass filter with limited bandwidth, and its function is to filter out frequency components exceeding half of the sampling frequency to reduce aliasing. Because the sampling frequency is 6400H...

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Abstract

The invention belongs to an electric energy quality monitoring technology, particularly a ship electric energy quality monitoring system. The system comprises a data analysis evaluation subsystem and data acquisition processing subsystems distributed on each node. The data acquisition processing subsystems are used for acquiring three-phase voltage and current signals of a ship power grid in real time and providing the three-phase voltage and current signals for the data analysis evaluation subsystem by the Ethernet; the data analysis evaluation subsystem is used for completing calculation of steady-state electric energy quality indexes in an on-line mode and giving an electric energy quality comprehensive evaluation according to an index weight; the detection of transient-state electric energy quality perturbation parameters is completed in an off-time mode; the steady-state electric energy quality indexes comprise a voltage deviation, a frequency deviation, harmonic waves, three-phase unbalance, voltage fluctuation and flicker; and the transient-state electric energy quality perturbation parameters comprise short duration voltage variation, time varying harmonic waves and inter-harmonics. According to the system, all the nodes on the power grid can be simultaneously monitored, the factors influencing the electric energy quality can be analyzed by a plurality of indexes and the level of the electric energy quality of the power grid is timely known.

Description

technical field [0001] The invention relates to power quality monitoring technology, which is a special monitoring equipment developed for detecting the operation quality of a ship's independent power grid, specifically a ship power quality monitoring system, which is mainly used for real-time acquisition, online and offline analysis and evaluation of the ship's power grid power quality. Background technique [0002] Power quality refers to the quality of AC or DC power supplied to electrical equipment or user terminals through the grid. The voltage, current or frequency deviation that causes the user's power equipment to not work normally, and any power problem that causes the failure or wrong action of the electrical equipment is a power quality problem. In addition to ensuring the sinusoidal waveform at rated voltage and rated frequency, power quality also includes all voltage transient phenomena, such as shock pulses, voltage drops, and instantaneous interruptions. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 夏立尹为民欧阳华李辉卜乐平邵英王征王黎明张超
Owner NAVAL UNIV OF ENG PLA
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