Improved trans z-source inverter with continuous input current and boost inversion capability
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This paper presents an improved dead-beat predictive direct power control strategy and new voltage vector sequences for reversible three-phase grid-connected voltage-source converters. It analyzes the rate of change of active and reactive power for each voltage vector in different sectors. The study found issues with the predicted duration times of conventional active vectors being less than zero. To address this, two alternative vector sequences are proposed, analyzed, and experimentally validated on a 1.5 kW reversible grid-connected voltage-source converter system.
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Modeling and Simulation of Three Phase D-SVC for Load CompensationInternational Journal of Power Electronics and Drive Systems
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The transmission of electric power has to take place in the most efficient way in addition to providing flexibility in the process. Flexible A.C. Transmission System (FACTS) promotes the use of static controllers to enhance the controllability and increase the power transfer capability. Providing reactive shunt compensation with shunt-connected capacitors and reactors is a well-established technique to get a better voltage profile in a power system. Shunt Capacitors are inexpensive but lack dynamic capabilities, thus some form of dynamically controlled reactive power compensation becomes essential. In this paper, three phase Distribution Static Var Compensator (D-SVC) has been developed and studied under different conditions. Open loop mode and closed loop mode of operation of D-SVC is simulated and studied. The work presented here is very much useful for distribution system, for effective reactive power management and better Voltage control.A04 05 0110
A04 05 0110International Journal of Engineering Inventions www.ijeijournal.com
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This document investigates the performance of a monopolar HVDC transmission system feeding a weak AC network using different reactive power compensators (RPCs). It analyzes the transient performance of hybrid RPC combinations including synchronous compensator (SC) + static VAR compensator (SVC), SVC + static synchronous compensator (STATCOM), and SC + STATCOM under various fault conditions. Simulation results show that the equal mix of SC and STATCOM has the steadiest and fastest response. The document also compares the performance of an optimal proportional-integral (PI) controller tuned with the firefly algorithm to a conventional PI controller. The firefly algorithm is used to minimize rectifier and inverter DC power errors to determine optimal PI gains.POWER SYSTEM STABILITY OF MULTI MACHINE BY USING STATIC SYNCHRONOUS SERIES CO...
POWER SYSTEM STABILITY OF MULTI MACHINE BY USING STATIC SYNCHRONOUS SERIES CO...ijiert bestjournal
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In this paper the problem of modeling and simulati on of voltage stability is improved using Static Synchronous Series Compensator (SSSC). Due t o the continuous demand in electric power system,the system is heavily loaded,this ca uses to voltage instability. In this work,a static synchronous series compensator (SSSC) is use d to minimize the effect of this device in controlling active and reactive powers as well as d amping power system oscillations in transient mode. The PI controller is used to achiev e the zero signal error. The result is obtained from simulation using MATLAB. In short whe n any disturbances occur in transmission line,if SSSC is connected then distur bance in the system is minimized & system will reach the steady state condition very quickly.A new switching look-up table for direct power control of grid connected 3L-N...
A new switching look-up table for direct power control of grid connected 3L-N...International Journal of Power Electronics and Drive Systems
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This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.Hn3613321337
Hn3613321337IJERA Editor
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1) The document compares the effectiveness of TCSC (Thyristor Controlled Series Capacitor) and SSSC (Static Synchronous Series Compensator) in damping sub-synchronous oscillations in power systems.
2) It describes the control structures of TCSC and SSSC, which include a PI controller and supplementary sub-synchronous damping controller (SSDC) that takes the rotor speed deviation as input.
3) Simulation results on the IEEE second benchmark model show that SSSC has superior ability to damp sub-synchronous oscillations compared to TCSC when subjected to disturbances like a change in input mechanical power or disconnection of a transmission line.G046033742
G046033742IJERA Editor
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This document presents a control scheme for a D-STATCOM (distribution static compensator) to compensate for power factor and harmonic current in an electric power distribution system. It begins by introducing D-STATCOM technology and its role in providing reactive power support and voltage regulation on distribution feeders. It then describes the proposed control scheme, which is based on instantaneous power theory and aims to make the source current purely sinusoidal with unity power factor. Simulation results are presented comparing the proposed control scheme to an existing one, showing the new scheme achieves unity power factor compensation after a load is switched on.Capacitor current analysis of a three-level neutral point clamped converter u...
Capacitor current analysis of a three-level neutral point clamped converter u...IJECEIAES
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A neutral point clamped (NPC) converter is considered a forefront in industrial applications. Supplying a typically balanced stand-alone load is one of those applications. However, the loading may become unbalanced which can impact the capacitors’ current and voltage ripple. In this work, an approach is proposed that analyze the capacitor current under unbalanced loading. The proposed method is based on a combination of two-dimensional Fourier series and symmetrical components. Since, two-dimensional Fourier series sectorize the spectrum into harmonics that are either defined by multiples of, fundamental, carrier or both frequencies, the method derives the Fourier coefficients for each sector, corresponding to a sequence current. Therefore, based on the presented approach, each harmonic amplitude in the spectrum sector is defined by three Fourier coefficients reflecting zero, positive and negative sequence current. The capacitor current spectrum is obtained by vector summing sequence coefficients. The method is tested on unbalanced load conditions with (out) a ground path. Results verify feasibility of the proposed method in deriving Fourier coefficients of capacitor currents that accurately reflects the loading status of the NPC. This is vital for converter design in terms of proper sizing of DC capacitor and can help in avoiding components failure.H04945260
H04945260IOSR-JEN
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- The document describes a unified power flow controller (UPFC) which consists of two voltage source converters connected respectively in series and shunt with a transmission line, with a common DC link.
- It proposes modeling the UPFC using a discrete simulator in MATLAB with 12-pulse converters to reduce voltage harmonics, and controlling the series and shunt converters separately while coordinating them.
- Simulation results showed the UPFC model reflected static and dynamic characteristics, and harmonics analysis was performed on the output during different system conditions including faults.Ijetr021124
Ijetr021124Engineering Research Publication
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Voltage-current Double Loop Control Strategy for Magnetically Controllable Re...
Voltage-current Double Loop Control Strategy for Magnetically Controllable Re...Kashif Mehmood
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Voltage regulation depending on reactive power
compensation is the main feature of the AC power supply
system. Magnetically controllable reactors (MCR) are
becoming a growing demand for this purpose. The structure
and working principles of MCR are analysed in this paper
while a simulation model is established. The reactive power
compensation strategy based on a single loop voltage control
system (SLVCS) is presented and a double loop
voltage-current control system (DLVCCS) is proposed. A
comprehensive scenario is developed to mitigate reactive power
compensation by using the proposed controls. Simulation
results substantiate that proposed controls of MCR has a faster
response in comparison to the traditional control, and it
provides the least voltage variation at the line end. It also
shows that the proposed control on MCR meet the desired
objective of the voltage regulation and provides flexibility to ac
transmission systemPower Factor Improvement in Distribution System using DSTATCOM Based on Unit ...
Power Factor Improvement in Distribution System using DSTATCOM Based on Unit ...RSIS International
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Power factor plays important role in the function of
the power system network. Hence, the power factor
improvement will increase the performance of power system
equipments. This paper presents the design and implementation
of distribution static compensator (DSTATCOM) with the stardelta
transformer for improvement of the power factor in threephase
four wire distribution system in the presence of threephase
linear load in the events of single phase, two-phase and
three phase trippings. The unit vector template method based
control algorithm has been implemented for the control of the
proposed DSTATCOM. The proposed test model has been
simulated in SIMULINK/MATLAB environment. The
simulations results show the effectiveness of proposed algorithm129 venezuelan static var compensator
129 venezuelan static var compensatorwmelis
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This document discusses using a Static Var Compensator (SVC) to increase voltage stability and power limits on an electric transmission system in Venezuela. It describes modeling the power system and contingencies using ATP/EMTP software. Simulation results showed that adding a 400MVar SVC at the Malena bus allowed an increase of 48% in maximum power flow between the Malena and San Geronimo lines during a fault, while maintaining bus voltages within limits.Augmentation of Real & Reactive Power in Grid by Unified Power Flow Controller
Augmentation of Real & Reactive Power in Grid by Unified Power Flow ControllerIJERA Editor
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In this paper, a Power Flow Control in transmission line with respect to voltage condition (L-G, L-L-G, L-L)
over come by using unified power flow controller. The existing system employs UPFC with transformer less
connection with both series and shunt converter. This converter have been cascaded with multilevel inverters
which is more complicated to enhance the performance of UPFC.A proposed system consist of three terminal
transformer for shunt converter and six terminal transformer for series converter. Shunt converter & series
converter is coupled with common DC capacitor. DC link capacitor voltage is maintained using PID controller
and synchronous reference frame theory (SRF) is used to generate reference voltage & current signal.
Simulation studies are carried out for (L-G, L-L-G, L-L real & reactive power compensation results will be
shown in this paper)6 design of an optimized modulation 17
6 design of an optimized modulation 17Alexander Decker
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This document discusses a technique to optimize pulse width modulation (PWM) for voltage source converters (VSCs) used in high-voltage direct current (HVDC) transmission systems. The technique aims to provide harmonic immunity between the alternating current (AC) and direct current (DC) sides when the DC link voltage contains low-frequency harmonic components.
Selective harmonic elimination PWM (SHE-PWM) is used to calculate switching angles that eliminate specific harmonics. When a DC ripple voltage is present, it can introduce harmonics like the 3rd harmonic. The proposed technique repositions these harmonics by dynamically adjusting the modulation index based on precalculated SHE-PWM solutions for different modulation indexes. This reverses the effect ofGy3512171221
Gy3512171221IJERA Editor
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International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.Ci36507510
Ci36507510IJERA Editor
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International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.Performance Investigation of a Monopolar HVDC Transmission System Feeding a W...
Performance Investigation of a Monopolar HVDC Transmission System Feeding a W...International Journal of Engineering Inventions www.ijeijournal.com
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This paper investigates the performance of line commutated converter (LCC) based monopolar HVDC transmission system feeding a weak AC network with hybrid reactive power compensators (RPC’s) at the inverter AC side. The hybrid compensator is an equal mix of any two of the following compensators: synchronous compensator (SC); static var compensator (SVC); static synchronous compensator (STATCOM). The HVDC transmission system model is implemented in the Matlab with the firefly algorithm based optimal proportional integral (PI) controller for rectifier and inverter control. The transient performances of hybrid RPC’s (SC+SVC, SVC+STATCOM and SC+STATCOM) are judged under various fault conditions and the outcomes are compared with the performance of the SC, SVC and STATCOM to highlight the supremacy of the hybrid compensators. The simulation results validate that the equal mix of SC and STATCOM has a steady and fastest response. The results also demonstrate the superiority of the firefly algorithm based optimal PI controller over the conventional PI controller. The harmonic analysis is also carried out under steady state operation to assure the quality of power supply on the inverter AC side.A NOVEL TCHNOLOGY FOR HARMONICS AND UNBALANCE COMPENSATION IN ELECTRIC TRACTI...
A NOVEL TCHNOLOGY FOR HARMONICS AND UNBALANCE COMPENSATION IN ELECTRIC TRACTI...ijiert bestjournal
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Modeling and Simulation of Three Phase D-SVC for Load Compensation
Modeling and Simulation of Three Phase D-SVC for Load CompensationInternational Journal of Power Electronics and Drive Systems
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POWER SYSTEM STABILITY OF MULTI MACHINE BY USING STATIC SYNCHRONOUS SERIES CO...
POWER SYSTEM STABILITY OF MULTI MACHINE BY USING STATIC SYNCHRONOUS SERIES CO...ijiert bestjournal
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A new switching look-up table for direct power control of grid connected 3L-N...
A new switching look-up table for direct power control of grid connected 3L-N...International Journal of Power Electronics and Drive Systems
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Power Factor Improvement in Distribution System using DSTATCOM Based on Unit ...
Power Factor Improvement in Distribution System using DSTATCOM Based on Unit ...RSIS International
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Performance Investigation of a Monopolar HVDC Transmission System Feeding a W...
Performance Investigation of a Monopolar HVDC Transmission System Feeding a W...International Journal of Engineering Inventions www.ijeijournal.com
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Improved trans z-source inverter with continuous input current and boost inversion capability
- 1. IMPROVED VOLTAGE-VECTOR SEQUENCES ON DEAD-BEAT PREDICTIVE DIRECT POWER CONTROL OF REVERSIBLE THREEPHASE GRID-CONNECTED VOLTAGE-SOURCE CONVERTERS ABSTRACT: This paper presents a dead-beat predictive direct power control (DPC) strategy and its improved voltage-vector sequences for reversible three-phase grid-connected voltage-source converters (VSCs). The instantaneous variation rates of active and reactive powers, by applying each converter voltage vector in 12 different sectors, are deduced and analyzed. Based on the power variation rates, it is found that the values of the predicted duration times for the two conventional active converter voltage vectors are less than zero when the grid-connected VSC operates as either a rectifier or an inverter. In order to solve this issue, two new alternative vector sequences are proposed and compared. Experimental results on a 1.5 kW reversible grid-connected VSC system are presented to validate the feasibility of the proposed voltage-vector sequences on the dead-beat predictive DPC strategy.