Power supply system development of the “Marsel” residential settlement with additional supply from a wind farm
Students Name: Masliuk Vladyslav Ruslanovych
Qualification Level: magister
Speciality: Power Supply Systems and Energy Management
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: The power supply system of a residential area is a complex consisting of transformer substations, power transmission lines, central distribution points, power receivers, power consumers, RZiA devices that ensure the normal operation of electrical equipment by providing it with high-quality electricity in the required quantity. Basic principles of SEP design: analysis of information about power sources, their distance to the projected object, passport data of transformers, installed capacities of consumers; provision of reliable power supply in compliance with all indicators of electricity quality [4] and taking into account the categorization of consumers according to the reliability of electricity supply; taking into account different types of load and their location on the general building plan; the designed scheme should be easy to read, reliable and high-quality, easy to maintain and comply with all regulatory and legal documents; design of the network taking into account the perspective of the development of the residential quarter, taking into account possible connections to the projected power sources of sub-consumers; the designed SEP must be safe for service personnel, equipped with relay protection and automation devices to disconnect short-circuit currents and prevent the occurrence of emergency situations at the facility. The object of the study is the development of a power supply system for the residential quarter "Marseille" with additional power from a wind power plant. The subject of the study is the choice of the optimal technical and economic option of the power supply system and its modes. The purpose of the work: design of the external and internal power supply system of the object with the introduction of advanced technologies for the generation of electrical energy by its own wind power plant in accordance with current regulatory documents. A complete transformer substation (KTP) is an electrical installation designed to receive, transform and distribute electrical energy from three-phase alternating current to an industrial frequency of 50Hz in systems with a blind-grounded neutral of the transformer on the lower voltage side [8]. Single-transformer TP-10/0.4kV are used when powering electrical receivers that allow an interruption in the power supply for a time that will not exceed 1 day, necessary for the repair or replacement of a damaged element (powering electrical receivers of category III), can also power electrical receivers of category II, according to conditions for power backup from another power source [1, 5]. Two-transformer TP-10/0.4kV are used for powering electrical receivers that allow an interruption in power supply for up to 1 day (the time required to turn on the backup power by the actions of the staff on duty)[1, 5]. A four-wire cable line is laid from the transformer substation to the input distribution device. Three conductors are linear (phase), and the fourth is neutral (neutral). The voltage between the neutral wire and any linear wire is called phase and its value is equal 220 V. The voltage between the linear wires of a three-phase alternating current system is called linear - its value is 380 V. In a residential quarter, there is a distinction between lighting networks with a supply voltage of 220 V, intended for lighting installations, and power networks - with a supply voltage of 380 V, intended for power installations [5, 9]. Input-distribution device (VRP) is a device that also contains devices and devices on outgoing lines. VRP is used for reception, distribution and accounting of electricity of three-phase alternating current with an industrial frequency of 50 Hz, at a voltage of 220/380V. VRP, switchboards, must be installed in the switchboard premises of the facility. VRP is a mandatory device for power supply of a residential quarter [5]. In the input and distribution device there are: - input automatic switch; - electricity metering meters; - measuring devices (ammeters, voltmeters); - protection equipment; - switchboard switches. In this work, first of all, an analysis of input data on the characteristics of residential buildings and a hotel was carried out. Taking this into account, we proceeded to the stage of determining the estimated electrical loads for each input of the input and distribution device of buildings and hotels, determined the level of reactive power compensation, and also calculated the total load, which was 1137.81 kVA [1]. According to this indicator, a two-transformer substation with power dry transformers with a capacity of 1250 kVA each was chosen. In the section on choosing an external power supply scheme, a techno-economic comparison determined that it is more economically feasible to supply the TP with a 10 kV cable line. Having already prepared the data, they proceeded to the selection of the internal power supply scheme, where they selected and checked the cables that will power the projected structures in normal and emergency modes. After that, we proceeded to the calculation of short-circuit currents at two points of the projected electrical network [2], [3], according to which, in the next point, the designed equipment was checked according to certain criteria. The calculated short-circuit current on the 10 kV side of the district substation is 6.23 kA, on the 10 kV side of the designed substation - 4.35 kA, and on the 0.4 kV side of the designed substation - 28.23 kA. It was indicated on the basis of which types of cells it is necessary to install TP. They also calculated the generation of electrical energy by wind generators [7] and proposed a variant of the scheme with step-up transformer substations, with the help of which it is possible to sell electricity to the network at a green tariff.