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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...
This paper investigates how different approaches to grid synchronization and reference frame orientation can improve the control performance of a voltage source inverter operating in a weak grid. It is first shown how voltage-sensor-less operation based on Virtual Flux allows for flexibility in how to choose the reference frame orientation of the control system. The different possible orientations...
In this paper, a new power sharing control method for a microgrid with several distributed generation units is proposed. The presence of both inertial and non-inertial sources with different power ratings, maximum power point tracking, and various types of loads pose a great challenge for the power sharing and system stability. The conventional droop control method is modified to achieve the desired...
The integration of distributed energy resources (DES) with the distribution network offers a number of technical, environmental, and economical benefits. This paper demonstrates the functions of a series grid interconnection module that integrates distributed generations (DG) and energy storage (ES) for peak load shaving and power quality enhancement. The proposed module uses a voltage source converter...
In this paper a power electronic interface (PEI) to integrate up to two renewable energy sources is presented. Through the control of the DC link terminal voltage and the AC terminal voltage of the voltage source converter (VSC) the generation of the different distributed sources can be adapted to the grid, supplying the local load and exporting energy to the grid. The system was analyzed under distorted...
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...
In this paper, the joined reactive power compensator and active filter functionality, of a grid connected two level Voltage Source Converter (VSC), is explored. This VSC, fulfills two different objectives: Compensate current harmonics demanded by non-linear loads (active filter application) and exchange reactive power with a grid subjected to balanced and unbalanced dips. For that purpose, a coordinated...
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...
In this paper a local generation system (LGS) based on an induction generator (IG) is presented. The IG supplies the active power to the system with the support of a voltage source converter (VSC) for power conditioning. With the LGS connected to the grid through coupling inductors the deficit or the excess of power production of the IG is imported or exported to the grid at unity power factor. In...
The paper discusses the operational domain of three phase voltage source converters (VSC) connected to an ac grid. The effects of the parameters (X/R ratio) of the conductors between the VSC and grid on the active and reactive power transfer are analyzed. The impacts on the control parameters, namely, the power angle and output voltage of VSC have been described. The study has revealed the active...
In this paper a local generation system (LGS) based on an induction generator (IG) is presented. The IG supplies the active power to the system with the support of a voltage source converter (VSC) for power conditioning. With the LGS connected to the grid through coupling inductors the deficit or the excess of power production of the IG is imported or exported to the grid at unity power factor. In...
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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