An energy monitoring device and monitoring method for power distribution terminals in offshore power grids

Abstract

The invention relates to an offshore power grid power distribution terminal energy source monitoring device and a monitoring method. The offshore power grid power distribution terminal energy source monitoring device comprises a current transformer conditioning circuit; loop three-phase current and loop residual current at an offshore power grid power distribution terminal flow through the current transformer conditioning circuit to be processed and then are input into a metering and analyzing module; loop three-phase voltage of the offshore power grid power distribution terminal is processed through a voltage adjusting circuit and then is input into the metering and analyzing module; the metering and analyzing module calculates all electric quantity parameters of each phase and a combined phase according to a received current value and a received voltage value; the electric quantity parameters are read into a control module through an SPI (Serial Peripheral Interface); the control module is used for controlling all the received electric quantity parameters to realize monitoring of residual current of an offshore power grid power distribution terminal energy source and the temperature of a power distribution loop conductor, and tendency predication and analysis of the residual current. According to the monitoring method disclosed by the invention, the detection of the residual current and tendency thereof, and the temperature of the power distribution loop conductor can be realized. The offshore power grid power distribution terminal energy source monitoring device and the monitoring method disclosed by the invention are applicable to all the power grid power distribution terminals.

Description

technical field [0001] The invention relates to the technical field of offshore power grid energy monitoring, in particular to an energy monitoring device and monitoring method for power distribution terminals of a marine power grid used for power system energy monitoring. Background technique [0002] The energy monitoring device is based on the power meter to realize the effective monitoring of electric energy consumption. It is an indispensable measurement tool for the power system. Energy monitoring is also one of the indispensable means to ensure the safe operation of the power system and its power equipment. It can reflect The power parameters and power consumption status of the circuit during the operation of the power system are displayed, providing data support for the overall energy consumption analysis of the entire system. With the continuous development of the power industry and the application of integrated circuits in measuring instruments, the requirements fo...

AI Technical Summary

Problems solved by technology

At present, the functions of energy monitoring devices are relatively single, and basically can only realize the monitoring of circuit electrical parameters and energy consumption. Some high-end instruments increase the monitoring of power quality parameters, but cannot meet the requirements of the power system for the coexistence of power monitoring and reliability.

[0003] Especially for the small power grid system of offshore oil field platform, the stability of the power grid itself is not better than that of the large land power grid system. In addition, due to the continuous production characteristics of offshore platforms, most of the equipment in the power system is high-power equipment, and the output terminals of frequency converters are more Power switching devices (such as IGBT, GTO) using PWM control technology, the high-speed switching action makes the output of the inverter form electromagnetic interference or common-mode voltage through the spatial coupling of lines or electromagnetic waves, which may cause excessive spikes to the motor load or the entire power grid Problems such as voltage, vibration, and electromagnetic coupling to the ground wire often cause high-frequency interference in the circuit, which has a great impact on the stability of the power grid and the normal operation of other equipment

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