Introduction to HVDC.pdf

Ac power network ac circuit breaker ac filters

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AC power network AC circuit breaker AC filters Capacitor bank OLTC transformers Thyristor converter (3-phase bridges) Smoothing inductor DC filters To other converter station Converter station
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Introduction – HVDC Transmission Systems 6 HVDC Transmission Systems Typical applications of HVDC transmission systems HVDC transmission systems are found in several applications, as described below. Transmission of large amounts of electrical power between remote ac power systems over distances exceeding 1000 km without voltage compensation. Interconnection of ac power systems operating at the same frequency without being synchronized or operating at different frequencies. Each ac power system can thus continue to operate with its own power controller and be developed independently. For instance, in Japan, electric power grids operating at different frequencies (60 Hz and 50 Hz) are interconnected through HVDC transmission systems. Transmission of large amounts of electrical power under water over long distances (i.e., more than approximately 100 km), using submarine cables usually made of a single conductor. Connection to the grid of sites producing large amounts of electrical power from renewable energy resources (e.g., offshore wind farms, solar farms, and hydroelectric plants). Interconnection of electric power grids in different countries or areas to create a large power pool and increase the system reliability. For instance, the grid in the province of Quebec (Canada) is connected to the New England grid (United States) through an HVDC transmission system. Also, the grid in the United States is divided into three independent sub-grids (Western Interconnection, Eastern Interconnection, and Electricity Reliability Council of Texas [ERCOT] interconnection) which are interconnected using several HVDC transmission systems.
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Introduction – HVDC Transmission Systems HVDC Transmission Systems 7 Figure 5. HVDC transmission systems allow interconnection of ac power systems operating at the same frequency without being synchronized, or operating at different frequencies. They allow transmission of large amounts of electrical power under water. They permit connection to the grid of sites producing electrical power from renewable energy sources. HVDC link (back-to-back) HVDC link HVDC link HVDC link (submarine cable) HVDC link (back-to-back) HVDC link (power transmission over long distance) AC power network 50 Hz AC power network on island AC power network 60 Hz AC power network 60 Hz Wind farm Solar farm Remote hydroelectric plant Sea
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Introduction – HVDC Transmission Systems 8 HVDC Transmission Systems HVDC and FACTS HVDC transmission systems can serve the same basic purpose as flexible AC transmission systems (FACTS) which is to control the flow of electrical power between different ac power systems in a fast, stable, efficient, and reliable way. With HVDC transmission systems, however, electrical power is transmitted as dc power, which allows interconnection of unsynchronized ac power systems
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