Abstract
The article is devoted to the thyristor voltage regulator (TVR) development. The TVR purpose is to control power flows and regulate voltage in 6-20 kV distribution electrical networks (DEN). The principle of TVR operation is based on the plus EMF (or minus EMF) introduction into power line when the shared use of longitudinal (change of magnitude) and transverse (change of phase) voltage regulation. The description of the TVR prototype is given. The TVR prototype consists of a 0.4 kV thyristor switches, power transformers (shunt and serial) and a 6 kV switchgear. The TVR has a two-level control system (CS). The TVR prototype experimental research was conducted in four stages: check of power equipment, first level CS research, second level CS research, prototype tests as a whole. The connection diagrams (thyristor switches unit, transformer and measuring equipment) and contact connections reliability were checked when the power part was tested. A qualitative characteristic of the input and output signals was obtained when testing the first level CS. It is found that the thyristor control pulses are formed according to the developed algorithm. The correctness of control system algorithms, executed and transmitted commands, passed and received data was confirmed as a result of the second level CS tests. The TVR research results indicate that the prototype provides the smoothness and specified accuracy of voltage regulation in all modes. The control range of the output voltage relative to the input was ±10%. The discreteness of regulation did not exceed 1.5%. The range of change in the shift angle of the output voltage relative to the input was ±5°. Research confirmed the TVR ES operability and its readiness for trial operation.
Highlights
The electric power industry development and its transition to a new technological level are connected with implementation of Internet of energy concept [1, 2]
Synchronizing pulses are formed at the field programmable gate-array (FPGA) level from the obtained voltage values of the high-voltage winding of the transformers
Due to the commands received from the controller, pulses are formed in the FPGA to control the thyristor voltage regulator (TVR) thyristors
Summary
The electric power industry development and its transition to a new technological level are connected with implementation of Internet of energy concept [1, 2] This technology is aimed at converting electric networks from a passive device for transporting and distributing electricity to an active one that ensures energy security and power supply quality [3, 4]. Two important tasks must be solved when building distribution electrical networks (DEN) that operate on the Internet of energy principle: power flows control and power quality ensuring [7]. These tasks can be solved using devices that implement D-FACTS (Distributed Flexible Alternative Current Transmission Systems) technologies. The article is devoted to research of TVR prototype operability, the effectiveness of control system, and the readiness of the prototype for trial operation
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