16 research outputs found

    Dynamic Extension Algorithm Based Tracking Control of STATCOM Via Port-Controlled Hamiltonian System

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    A Novel Multi-Functional DSTATCOM with Distribution Generation using FRC Controller

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    Distribution Generation plays a significant role in remote areas where the utility grid is affected and initializing by renewable energy sources to acquire the sufficient power demand. In distribution system, it is very exigent consumer related concern which is confronted due to mis-operation of massive non-linear load apparatus. A multi-functional distributed static compensator incorporates the best choice for enhancing the power quality features with effective control scheme under rambled non-linear loads. Conventional control schemes are more adversed with greater switching losses due to extreme harmonic frequencies in a refernce current component. This paper proposes, a novel multi-objective fundamental reference current control scheme based multi-functional DSTATCOM furnishes the current harmonic compensation at PCC, reactive power compensation, power factor correction, active power exchanging, minimizing the switching losses, incredible efficiency and power factor correction. The validation of proposed multi-functional DSTATCOM with proposed control strategy under rated capacity of distribution generation is evaluated by using Matlab/Simulink platform and simulation results are presented

    Passivity-based harmonic control through series/parallel damping of an H-bridge rectifier

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    Nowadays the H-bridge is one of the preferred solutions to connect DC loads or distributed sources to the single-phase grid. The control aims are: sinusoidal grid current with unity power factor and optimal DC voltage regulation capability. These objectives should be satisfied, regardless the conditions of the grid, the DC load/source and the converter nonlinearities. In this paper a passivity-based approach is thoroughly investigated proposing a damping-based solution for the error dynamics. Practical experiments with a real converter validate the analysis.

    Adaptive Control for Power System Voltage and Frequency Regulation

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    Variable and uncertain wind power output introduces new challenges to power system voltage and frequency stability. To guarantee the safe and stable operation of power systems, the control for voltage and frequency regulation is studied in this work. Static Synchronous Compensator (STATCOM) can provide fast and efficient reactive power support to regulate system voltage. In the literature, various STATCOM control methods have been discussed, including many applications of proportional鈥搃ntegral (PI) controllers. However, these previous works obtain the PI gains via a trial and error approach or extensive studies with a tradeoff of performance and applicability. Hence, control parameters for the optimal performance at a given operating point may not be effective at a different operating point. To improve the controller鈥檚 performance, this work proposes a new control model based on adaptive PI control, which can self-adjust the control gains during disturbance, such that the performance always matches a desired response in relation to operating condition changes. Further, a new method called the flatness-based adaptive control (FBAC), for STATCOM is also proposed. By this method, the nonlinear STATCOM variables can easily and exactly be controlled by controlling the flat output without solving differential equations. Further, the control gains can be dynamically tuned to satisfy the time-varying operation condition requirement. In addition to the voltage control, frequency control is also investigated in this work. Automatic generation control (AGC) is used to regulate the system frequency in power systems. Various control methods have been discussed in order to design control gains and obtain good frequency response performances. However, the control gains obtained by existing control methods are usually fixed and designed for specific scenarios in the studied power system. The desired response may not be obtained when variable wind power is integrated into power systems. To address these challenges, an adaptive gain-tuning control (AGTC) for AGC with effects of wind resources is presented in this dissertation. By AGTC, the PI control parameters can be automatically and dynamically calculated during the disturbance to make AGC consistently provide excellent performance under variable wind power. Simulation result verifies the advantages of the proposed control strategy

    Power quality improvement using a STATCOM inverter

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    Most loads on an electrical network are reactive and have a lagging power factor, this reactive power is mostly supplied from the electricity generators and needs to be transmitted through the network just like any other load. The transmission of this reactive power also increases losses and causes unnecessary heating in infrastructure. An increase in Photovoltaic (PV) penetration in an electrical system has imposed several Power Quality (PQ) and voltage stability issues, the intermittent nature of solar generation mean there is a variable output of power to the system which leads to power imbalance issues and voltage sags and swells. A solution to this may in fact lie in the problem, there is a potential for the installed inverters associated with these systems to be utilised to improve local power quality by supplying or absorbing reactive power, day or night. Currently inverters are only being utilised during daylight hours, leaving an expensive piece of equipment lying dormant for the majority of a day. This research outlines the gathering of relevant information, compiles a feasibility assessment and documents expected outcomes and benefits. A research methodology is provided together with a risk assessment, project schedule and quality assurance plan and timeline. This research will provide useful information into the feasibility of grid controlled Static Compensator (STATCOM) inverters and the benefits this would have on power factor and subsequently voltage regulation to the immediate network

    Compensadores est谩ticos de potencia: visi贸n general y revisi贸n del estado del arte

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    En este art铆culo se presenta una revisi贸n del estado del arte del Compensador Est谩tico de Potencia utilizado para el mejoramiento de  la calidad de  la energ铆a el茅ctrica en  los  sistemas de distribuci贸n. Se expone el principio de operaci贸n de este dispositivo, sus modos b谩sicos de operaci贸n, las opciones de compensaci贸n que 茅ste dispositivo ofrece, la estructura del convertidor de potencia y las principales tendencias con respecto a sus estrategias de control (obtenci贸n de las se帽ales de referencia, control del convertidor de potencia y del bus de continua). Se enfatiza en el estado del arte de las estrategias de control debido al amplio trabajo desarrollado en este campo y al importante rol que juegan estas estrategias en el rendimiento del compensador. This paper  shows  a  state-of-the-art  rewiew on  the Distribution Static Compensators used  for  the power quality improvement  in distribution systems. The review  includes:  the operation principle,  its basic operation modes,  its compensation options, the power converter structure and the main trends of its control strategies (generation of the reference signals, power converter control and  DC storage device control). The control strategies are emphasized due to the extensive research on this feld and their key role in the compensator performance

    Passivity-based harmonic control through series/parallel damping of an H-bridge rectifier

    Get PDF

    Passivity-based harmonic control through series/parallel damping of an H-bridge rectifier

    Get PDF

    Passivity-based harmonic control through series/parallel damping of an H-bridge rectifier

    Get PDF
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