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Modeling of a VSC-HVDC system is an important step in analyzing the performance of the VSC-HVDC system. In this paper, the modeling details of the converters and the DC transmission line connected to a weak AC system are presented. The weak AC system considered is an island system comprised of synchronous generators and some passive loads. For proper functioning of the system, controllers play a very...
This paper presents the possible improvements of voltage quality in connection of a wind farm to transmission network using VSC-HVDC (Voltage source converter high voltage direct current) link. For a 80 MW wind farm consisting of 40 individual 2 MW doubly fed induction generators, the main influence of voltage fluctuation caused by the wind farm integration is analyzed. The use of a reactive controller...
The Voltage Source Converter (VSC) offers the possibility of full four quadrant operation and the total control active and reactive power with the minimal generation of harmonics with the SPWM technique. This paper presents the dq transformation of a VSC and its design of a vectorial control to regulate the DC voltage and reactive power in a rectifier station. Finally, the models and results are presented...
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...
In this paper, the voltage source converter is equivalently represented by voltage source model, thus the model of voltage source converter--high voltage direct current (VSC-HVDC) system suitable for optimal power flow is established. Each control mode could be considered by the model which can be applied to multiterminal VSC-HVDC. Moreover, internal and external operating limits can be taken into...
This paper proposes an approach to the selection and optimization of the parameters of the proportional-integral (PI) compensators in the various control loops of a VSC-HVDC transmission system using a decoupled control strategy. An optimization algorithm based on the simplex method is adopted. The objective is to simultaneously minimize the weighted sum of the “integral of the time absolute-error...
Voltage Source Converter (VSC) based HVDC is the most recent HVDC technology with extruded DC cables in small and medium power transmission. VSC-HVDC converters include Insulated Gate Bipolar Transistors (IGBT'S) and operated with high frequency Pulse Width Modulation (PWM) in order to get high speed control of both active and reactive power. With VSC-HVDC there is an addition degree of freedom. The...
This paper reports on various solutions proffered to mitigate voltage stability problems in power systems. Many papers in power engineering literature have presented many contributions in these area, recent papers presented the use of shunt and series capacitors for compensation of reactive power in power networks. The use of flexible alternating current transmission systems (FACTS) have also been...
The basic function of VSCs is to convert the DC voltage stored in a capacitor into AC voltages or AC voltages into DC voltage. One of the advantages of the VSC is that this kind of electronic converters allow to control the active and reactive power flow with an ac-grid independently. This paper presents a short analysis of the characteristics and dynamic of VSC-HVDC, identification techniques to...
The performance of VSC based HVDC system partially depends on its control strategy. Based on the steady state model of VSC-HVDC system, a power control strategy is proposed and a series of mathematical analysis expressions for power delivery are deduced using the coordinate conversion and variables substitution in terms of the original equations. The corresponding power controllers are designed using...
VSC-HVDC system based on voltage source converter connecting large-scale offshore wind farm is illustrated in the paper. To improve the transmission capacity and solve power quality problem, multilevel inverter is used in VSC-HVDC system. The simulation system is built on the basis of power control algorithm, implementing the independent control on bilateral sides. On wind turbine side, three are...
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...
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