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Insufficient reactive power in DC converter stations may deteriorate the whole system operating conditions. In this paper, the ratio between reactive power consumption and active power transmission as a HVDC system provides Emergency DC Power Support (EDCPS) is analyzed and derived. Then multicircuit HVDC system EDCPS Strategies with reactive power controls, such as emergency reactive power compensation,...
The obvious increment in carbon dioxide emission has encourage the power converters designers to enhance designs in order to guarantee the use of green power generation technologies. It should be balanced the fact that we need to decrease carbon dioxide emissions with the fact that we need to ensure that all power system technologies asure system stability, robustness and reliability. A useful power...
This paper presents a general model of dual infeed HVDC system applying VSC-HVDC, which can be used as an element in large multi infeed HVDC system. The model may have different structure under different grid faults because of the action of breakers. Hence power flow of the system based on this model is analyzed under steady state and different kinds of grid fault transient situations. Two main control...
The use of dynamic reactive power compensation devices such as the STATCOM to improve power quality and Fault Ride-Through capabilities of FSIG wind farms is investigated. Also, the use of VSC-HVDC transmission to isolate the wind farm from impacts of potential faults in the grid side is investigated. Dynamic performance of the FSIG wind farm is explored under several operating conditions, such as...
In this paper, the proposed interconnection of Sri Lankan power system grid and southern regional grid of Indian grid is modeled using a simple VSC configurations based on HVDC transmission. The control implemented is made in such a way that this will allow power transmissions in either way. Therefore voltage vector PLL based control together with DC-link voltage regulation is implemented. Here the...
With more and more Voltage Source Converter based HVDC (VSC-HVDC) projects including in power grid, it is of practical significance to develop a simplified and pertinent model of the VSC-HVDC for the electromechanical dynamic simulation. By proposing an equivalent voltage controlled source and full consideration of the control blocks, a quasi steady state model of the VSC-HVDC is proposed in the present...
Increased bulk power transactions in competitive energy markets together with large scale integration of renewable energy sources are posing challenges to high-voltage transmission systems. Environmental constraints and energy efficiency requirements also have significant effects on future transmission infrastructure development. This paper reviews the recent development in HVDC technologies and discusses...
The paper gives an overview of HVAC and HVDC connection of wind farm to the grid, with an emphasis on voltage source converter (VSC)-based HVDC for large wind farms requiring long distance cable connection. Flexible control capabilities of a VSC-based HVDC system enables smooth integration of wind farm into the power grid network while meeting the grid code requirements (GCR). Operation of a wind...
The current status of distributed generation technologies and Flexible AC Transmissions (FACTS) Technologies is reviewed. Then this paper discusses a framework for operation and control of smart grids with distributed generation and FACTS in which two controls such as voltage control and stability control are included. In light of the different time scale requirements of voltage control and stability...
This paper proposes a new HVDC (High-Voltage DC) transmission topology, its modeling and control method, used for large doubly-fed induction generator (DFIG)-based offshore wind farms. The sending end is a line commutated converter (LCC) with a STATCOM (Static Compensator) while the receiving end is a current source inverter (CSI) using IGBTs. The STATCOM provides stator voltage support for DFIGs,...
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