Abderrazak D.’s Post

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Senior Electrical Engineer

#GridEfficiency #HVDC #PowerGrids #RenewableEnergy #EnergyTransmission #SustainableEnergy #EnergyInnovation The DC power will flow through the overhead lines. At the user end, this DC has to be converted into AC. For that purpose, an inverter is placed at the receiving end. Thus, there will be a rectifier terminal in one end of HVDC substation and an inverter terminal in the other end. High-voltage direct current (HVDC) technology offers several advantages compared to alternating current transmission systems. For example, it allows more efficient bulk power transfer over long distances. However, cost is an important variable in the equation. Once installed, HVDC transmission systems are an integral part of the electrical power system, improving stability, reliability, and transmission capacity. High voltage is used for electric power transmission to reduce the energy lost in the resistance of the wires. For a given quantity of power transmitted, doubling the voltage will deliver the same power at only half the current: power=(voltage)⋅(current)=(2⋅voltage)⋅(1/2⋅current) Since the power lost as heat in the wires is directly proportional to the square of the current (heat=current²⋅resistance),  using half the current at double the voltage reduces the line losses by a factor of 4. While power lost in transmission can also be reduced by decreasing the resistance by increasing the conductor size, larger conductors are heavier and more expensive. 𝐓𝐨𝐩 𝐋𝐞𝐚𝐝𝐢𝐧𝐠 𝐌𝐚𝐫𝐤𝐞𝐭 𝐏𝐥𝐚𝐲𝐞𝐫𝐬 : ABB Ltd. Hitachi Ltd. Toshiba Corporation. Siemens AG 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬 𝐨𝐟 𝐚 𝐇𝐕𝐃𝐂 𝐬𝐮𝐛𝐬𝐭𝐚𝐭𝐢𝐨𝐧 𝐚𝐫𝐞: Converter Valves (IGBT or Thyristor); Conversion power transformers; Measuring instruments AC (voltage/current transformers); AC harmonic filters and AC shunt capacitors. DC-OHL/UGC (usually XLPE cable in case of VSC technology); DC harmonic filters; phase reactor (VSC-HVDC); DC capacitor (VSC-HVDC); Smoothing reactor; Measuring instruments DC (voltage/current transformers); DC switchgear (disconnector switchers/circuit breakers). 𝐀𝐫𝐞𝐚𝐬 𝐨𝐟 𝐇𝐕𝐃𝐂 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 𝐢𝐧𝐜𝐥𝐮𝐝𝐞: -Long-distance power transmission lines; -Submarine cable transmission (connections with lengths greater than 50 km usually used for offshore wind power plants power evacuation); -Interconnection of systems that operate asynchronously; -Multi-terminal HVDC systems.

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