Method for monitoring electric energy quality of power supply network, electric energy quality field device and electric energy quality system
A technology of power quality and field equipment, applied in the field of power quality systems, can solve the problems of frequent transmission, achieve long measurement time and reduce storage capacity
Inactive Publication Date: 2016-04-06
HARBIN UNIV OF SCI & TECH
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[0004] Since the data storage module built in the power quality field device cannot be chosen to be arbitrarily large for cost reasons, the transmission of the stored measured values to the central analysis computer must be carried out relatively frequently
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[0039] figure 1 The power quality field device 10 is shown highly schematically. The power quality field device 10 has a measuring device 11 with measuring inputs 12 a , 12 b and 12 c for recording measured values. The measuring device 11 of the power quality field device 10 is connected on the output side to a control device 13 which itself is connected on the output side to a fixed data memory 14 . A fixed data storage is to be understood here as a data storage which is suitable, for example, for the permanent storage of data, as opposed to a volatile data storage. This can be so-called permanent data storage, which ensures permanent data storage without external energy supply, such as flash memory or hard disks. In the present invention, however, a fixed data storage is also to be understood as a volatile data storage, which is supplied with electrical energy via an external energy source, so that continuous data storage is possible at least until called up in the volatil...
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In order to monitor electric energy quality of a power supply network with relatively low overhead by using an electric energy quality field device, the invention proposes a method for monitoring the electric energy quality in the power supply network. The method comprises the following steps of: acquiring a first measurement value of a first electric energy quality feature parameter by a measurement apparatus (11) of the electric energy quality field device (10, 50) arranged in a measurement position of the power supply network at a first measurement moment; acquiring a second measurement value of the first electric energy quality feature parameter by the measurement apparatus (11) at a second measurement moment after the first measurement moment; comparing the first and second measurement values with at least one pre-given threshold; and when one of the two measurement values is higher than the at least one threshold and one of the two measurement values is lower than the at least one threshold, generating an event signal indicating that the at least one threshold is destroyed. The invention furthermore relates to the electric energy quality field device for implementing such method, and an electric energy quality system.
Description
technical field [0001] The invention relates to a power quality monitoring method in a power supply network, a power quality field device and a power quality system. Background technique [0002] Today's power supply grids are highly complex networks for distributing electrical energy, usually with a large number of energy feed-in and energy consumption. In addition to power supply security, ie ensuring that a sufficient amount of power is provided to each energy user at every moment, the quality of the power provided (hereinafter referred to as "power quality") also plays a key role. The power quality in the power supply network is determined, for example, by means of so-called power quality characteristic parameters such as frequency, voltage and voltage harmonics or current harmonics, distortion factors, flicker, voltage asymmetry and power. Highly sensitive electrical devices currently require electrical energy to be supplied in the form of as pure a sine wave as possib...
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IPC IPC(8): H02J13/00G01R31/00
CPCG01R31/00H02J13/00009H02J13/00001Y04S10/52Y04S40/121Y02E60/00
Inventor 房国志顾星志
Owner HARBIN UNIV OF SCI & TECH