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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...
This paper introduces present situation of power grid synchronization parallel operation, and analyzes the principle and characteristics of back-to-back commutation mode and VSC-HVDC. Back-to-back VSC-HVDC is proposed in this paper, which can be used in the power grid synchronization parallel operation. Its working principle is that the difference of frequency and voltage can be regulated by means...
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...
Large and distant offshore wind power plants can be efficiently connected to the onshore power grid network using VSC-HVDC (Voltage Source Converter based HVDC) transmission. Chopper controlled resistors can be used to limit the DC line over-voltage when there is a fault on the onshore AC grid and power transfer to the grid is obstructed. Considering the development of full scale converter based wind...
For wind farms in near sea, in which doubly-fed induction generator (DFIG) runs, located at different site respectively, multi-terminal VSC-HVDC (Voltage Source Converter based HVDC) helps to resolve connection for each other and transmitting electrical power into main grid. The paper models wind farms, VSC-HVDC, designs control system and specially takes their control together into account in order...
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...
A multi-terminal voltage source converter based high voltage DC transmission systems (MTDC) was used for grid-connection of large offshore wind power generation. The design of a control system was discussed. A four-terminal system was built to test the control idea. Simulation using PSCAD/EMTDC has been carried out under various load and fault conditions.
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...
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