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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...
Electrical power system is a large interrelated set-up, which requires a cautious design in order to supply continuous electricity to consumers without any divergence. Power electronics based Flexible Alternating Current Transmission Systems (FACTS) are devices, which are used to perk up the power system reliability and stability. Unified power flow controller (UPFC), which comes under the member...
<?Pub Dtl?>This paper proposes a multi-option power flow approach for hybrid AC/DC grids. A unified AC-DC unit is introduced which can be used in two different cases: case a) AC grids with embedded VSC-based MTDC grids, and case b) asynchronous AC grids connected via a common VSC-based MTDC grid. In the proposed method for each MTDC grid (regardless of the number of converters), a new state...
This paper gives the State Space modeling of Distribution Static Synchronous Compensator (D-STATCOM). It is important to keep the voltage constant in the distribution system, hence voltage regulation is required in the distribution network. Voltage Source Converter (VSC) based D-STATCOM achieves voltage regulation in the connected bus by absorbing/supplying the required reactive power. The capability...
This paper presents a detailed model of a Voltage Source Converter (VSC) operated HVDC transmission system, simulated with EMTP-RV package, in order to investigate its operational performance. The VSC control strategy is explained using vector control. The effect of de-coupling between the control parameters is investigated by applying disturbances in the reference quantities of active and reactive...
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 deals with an application of the power balance theory in a voltage and frequency controller (VFC) of an autonomous wind power generation using an isolated asynchronous generator (IAG) feeding three-phase four wire loads. The reference generator currents are estimated using the power balance theory to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC)...
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...
This paper compares the performance of angle and frequency droops in an autonomous microgrid that only contains voltage source converter (VSC) interfaced distributed generators (DGs). As a VSC can instantaneously change output voltage waveform, power sharing in a microgrid is possible by controlling the output voltage angle of the DGs through droop. The angle droop is able to provide proper load sharing...
This paper presents analysis and design of Distributed STATic COMpensator (DSTATCOM) with fuel cell utilized for power quality improvement and hybrid power generation. Factors affecting the performance and limitation of active and reactive power compensation are analyzed and presented in this paper. A boost converter circuit is selected to step up and regulate the fuel cell terminal voltage to match...
This paper proposes a dynamic model and control strategies of a voltage source converter (VSC) based high voltage direct current transmission system. Assuming there is no zero-sequence components exist and the AC network is balance, so there are no negative-sequence components and the voltage and current variables are all positive-sequence components expressed in the positive-sequence frame. In this...
The development of renewable energy resources generation technologies requires the support of VSC-HVDC systems. VSC-HVDC systems using PWM controlled voltage source converters (VSCs) have the attractive features such as fault propagation prevention, increasing low frequency stability and voltage stability. This paper established the dynamic mathematical model for the VSC-HVDC system. Based on the...
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...
To study and analyze the dynamic performance of the flexible AC transmission system (FACTS) devices, modelling of the FACTS devices is needed. Reactive power compensation is an important issue in the control of electric power systems. Reactive power increases the transmission system losses and reduces the power transmission capability of the transmission lines. Moreover, reactive power transmitted...
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