HVDC HIGH-VOLTAGE DIRECT-CURRENT SYSTEM-EEE


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Interaction of a HVDC System with 400-kV AC Systems on the Same Tower
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The loading of existing power systems will in the near future further increase for example because of increasing demands and difficulties to open new transmission corridors. Parallel operation of a bipolar high-voltage direct-current ( HVDC ) power transmission system with

Itaipu HVDC transmission system 10 years operational experience
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The Itaipu HVDC system has now transmitted power for 10 years. The scheme, designed in 1979, includes many features new at the time and continues to be the largest HVDC transmission, in both rating, 6,300 MW, and voltage,±600 kV. Major operating features

The Estlink HVDC light transmission system
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The Estlink transmission system operates at±150 kV DC and is rated at 350 MW of active power in either direction. The system was ready for operation in Dec 2006, only 19 months after the award of the contract. The link interconnects the national grids of Estonia and

Back-to-back HVDC system performance with different smoothing reactors
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The two distinct types of hvdc systems being constructed are (1) transmis-sion systems incorporating either overhead lines or underground cable or a combination of both and (2) back-to-back asynchronous ties (See Figure 1). The latter type elimi-nates the line and/or

Case study of a multi-infeed HVDC system
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Infeed HVDC system when feeding a weak AC network. Typical issues concerning multi- infeed configurations are: need for coordination of the recovery control, need for different DC modulation strategies to stabilize the system , possibility of voltage instability of the area

Hybrid simulation of±500kV HVDC power transmission project based on advanced digital power system simulator
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In order to effectively imitate the dynamic operation characteristics of the HVDC (high voltage direct current) power transmission system at a real±500 kV HVDC transmission project, the electromechanical-electromagnetic transient hybrid simulation was carried out

Qualification of an extruded HVDC cable system at 525 kV
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ABSTRACT A new 525 kV DC cable system with a power rating range exceeding 2 GW has been developed for both subsea and underground applications. The extruded HVDC cable system technology is appropriate when power needs to be delivered efficiently through

Application of HVDC for large power system interconnections
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0. ABSTRACT AC power systems have been developed by applying interconnections, first to the neighboring systems and then to larger complex systems covering parts of or even whole continents to gain technical and economical advantages. With an increasing size of

Performance analysis of a voltage source converter (VSC) based HVDC transmission system under faulted conditions
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Abstract Voltage Source Converter (VSC) based HVDC transmission technology has been selected as the basis for several recent projects due to its controllability, compact modular design, ease of system interface, and low environmental impact. This paper investigates the

Power Management Strategy in Multi-Terminal VSC- HVDC System
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Due to the significant increase of using renewable energy resources (such as wind, solar, etc.) interconnect into the AC systems, utilizing Multi-Terminal High Voltage DC (MTHVDC) systems is a promising solution in terms of economic and technical considerations

Reliability improvement strategies for HVDC transmission system
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This paper analyses reliability data of HVDC systems of Southern China Power Grid. The weak links of HVDC systems operational reliability are DC control and protection, valve hall and valve cooling system and transmission lines. Some improvement measures and HVDC

Optimal decentralized load frequency control in a parallel AC-DC interconnected power system through HVDC link using PSO algorithm
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A new design of decentralized load-frequency controller for interconnected power systems with ac-dc parallel using Particle Swarm Optimization (PSO) algorithm is proposed in this paper. A HVDC link is connected in parallel with an existing ac tie-line to stabilize the

A Stabilization of frequency oscillation in a parallel ac-dc interconnected power system via an HVDC Link
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This paper presents a new application of High Voltage Direct Current ( HVDC ) link to stabilization of frequency oscillations in a parallel AC-DC interconnected power system . When an interconnected AC power system is subjected to a large load with rapid change

Model integration and control interaction analysis of AC/VSC HVDC system
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AC alternating current ACS average cold spell AGC automatic generation controls AVR automatic voltage regulator AWC Atlantic wind connection CCGT combined cycle gas turbine CSC current source converter CSG China Southern Power Grid CTL cascaded two

Perspectives of HVDC and FACTS for system interconnection and grid enhancement
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The growth and extension of AC systems and consequently the introduction of higher voltage levels have been driven by a fast growth of power demand over decades. Power systems have been extended by applying interconnections to the neighboring systems in

Analysis of commutation failure in multi-infeed HVDC system under different load models
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HVDC technology has been widely used in modern power system . On one hand, HVDC has the advantages of economy, high efficiency and strong controllability. While on the other hand, it makes the dynamic characteristics of the power system becoming more and more

Development of pre-molded accessories for HVDC extruded cable system
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The high voltage direct current ( HVDC ) system has been applied for long-distance power transmission to reduce power transmission loss. Various accessories for HVDC extruded cable have developed and some have already been in actual service line. But for shortening

Damping power system oscillations by VSC-based HVDC networks: A North Sea grid case study
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This paper introduces a control strategy for damping of onshore power system oscillations through a voltage source converter based HVDC offshore grid. Time domain simulations are performed for a North Sea grid case study where the DC grid connects two asynchronous

Automatic generation control in multi area interconnected power system by using HVDC links
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This paper investigates the effects of HVDC link in parallel with HVAC link on automatic generation control (AGC) problem for a multi area power system taking into consideration system parameter variations. A fuzzy logic controller is proposed for four area power system

Solvers for real-time simulation of bipolar thyristor-based HVDC and 180-cell HVDC modular multilevel converter for system interconnection and distributed
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Thyristors-based converters are still today the most common type of HVDC links. Modular Multilevel Converter based HVDC links are often considered for lower power rating projects like off-shore wind farms. Both approaches present challenges in both the design and the



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