Power Quality Analyzers
Customer's Concern
In October 2023, we were approached by a Kazakh oil company developing oil fields in western Kazakhstan. The field's power facilities consist of 7 gas piston generators with a total capacity of over 6 MW, 4 diesel generators with a total capacity of 2 MW, 47 substations of various capacities, over 100 oil pumps and compressors.
The customer came up with the following problem: when a powerful 500 kW compressor was turned on, the voltage and frequency of the network dropped to unacceptable values, which did not allow this compressor to start. The tasks were set to determine what is happening in the Customer's electrical network, what deviations there are, what events and transients occur, how technological processes affect the quality of voltage.
For this kind of task, Janitza electronics power analyzers are ideally suited, capable of measuring up to 2000 different parameters of the power grid, connected to any type of AC voltage, with memory and all kinds of communication interfaces. Accordingly, for the collection, storage and processing of measured data, the factory software from Janitza electronics – GridVis, which has rich functionality and capabilities, is used.
Identifying Problems
For more than ten years, our team has been using Janitza devices for their own integration and service projects, as well as offering them to all interested companies. Devices from Janitza are the most important part of the EMS (Energy Management System) system, which is necessary for the most accurate control over the quality of electricity of an individual enterprise, institution or company.
To identify problems with power quality, five Janitza power analyzers were installed at the Customer's oil fields. The UMG 604, UMG 605 and UMG 96-PA models were used. The instruments were connected to existing measuring circuits with voltages of both 0.4 kV and 6 kV. At the facility, all devices were connected to the local local area network, with remote access through specialized GridVis software.
Typical wiring diagram of a Janitza power analyzer
Measurements with the analyzers were carried out continuously for a month, as a result of which a large amount of material was collected. Based on the results of the analysis of these data, the following deviations and problems in the Customer's network were identified:
• Voltage and frequency drops on the generation buses as a result of a sudden onslaught of a powerful load, or an emergency shutdown of one of the generators.
• Surges in voltage and frequency when the load is abruptly relieved or one of the generators is started.
• Permanently low voltage in remote areas of the network.
• Constantly present odd voltage harmonics in the mains that go beyond the normalized values.
Proposed solution from MEK-Astana LLP
Based on the measurements and analysis, the engineers of MEK-Astana provided the Customer with recommendations for eliminating the above problems, including a technical solution for stabilizing voltage and frequency in the distribution network of the field.
To ensure frequency and voltage stabilization in the 6 kV network, it was proposed to equip the existing island generation of the Customer with a dynamic stabilization system based on the equipment of Piller Power Systems (Germany). It is proposed to connect the UBT Piller units to 6 kV buses in parallel to the generation sources.
The Dynamic Stabilizer (UBT) is a synchronous motor-generator and energy storage based on twin PB21 flywheels with a maximum energy capacity of 2 x 21 MJ. This unit will stabilize the voltage in the network in the range of ±10% and the frequency in the range of ±0.2 Hz, in cases of abrupt discharges and surges of powerful loads, as well as in cases of short-term emergency shutdowns of gas piston generators.
https://mek.kz/en/brands/janitza-electronics-gmbh/
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