Abstract
The article discusses power supply quality in an industry in terms of Mikheevsky GOK—one the largest mining and processing plants in the Chelyabinsk Region and in Russia. The power supply quality is understood here as the reliability, economic efficiency and electromagnetic compatibility of basic power consumers. These objectives can be successively achieved through in-house power generation by gas piston power plants, as well as thanks to banks of supercapacitors capable to maintain power factor within the present ranges. The capital expenses connected with buying mill electric drives with capacity to tens megawatts are appreciably cut down owing to an original decision to use asynchronous motors with phase-wound rotors and liquid rheostats, which were commonly used at the dawn of adjustable electric drives. That decision allowed rejecting expensive variable speed drives at admissible power quality. Design and installation of capacitors with current-limiting coils neglected harmonics of lowvoltage variable speed drives and follow-up resonances, which resulted in overcurrents and in failure of the capacitors. Finally, the plant sustained considerable losses. The way out of this situation is shown by the research and modeling as series connection of currentlimiting coils and filters set to suppress outer lowest harmonics (5, 7, 11) in the canonical series. The economic effect and payback period of the implementation of the proposed solution are governed, first, by the extended failure-free operation of capacitors due to elimination of overcurrents and reduction in energy loss in wattless power flows and, second, by zero extra expenses connected with installation of filter-equipped coils. The study was supported by the President of the Russian Federation, Grant for Young Candidates of Sciences—MK-499.2020.8.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call