An autonomous induction generator system with voltage regulation (original) (raw)
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Voltage and Frequency Regulation of a Stand-Alone Self-Excited Induction Generator
2007 IEEE Canada Electrical Power Conference, 2007
This study deals with the development of a control system for voltage and frequency regulation of a micro hydro power generation system, fed by self-excited induction generator (IG). The generation system considers a four-wire threephase grid, composed by three phases plus neutral conductor, fed by three-phase three-wires IG. The neutral conductor is created from the neutral point of star connection of excitation capacitors bank. The four-wire configuration allows the connection of three-phase loads in star or delta configuration, as well as single-phase loads. The voltage regulation is performed through a four-legs distribution static synchronous compensator (DSTATCOM) shunt connected to the AC bus. It is considered the employment of adaptive control techniques and the compensation of load current unbalances, which offers suitable voltage regulation in conditions of system's parameters variations such as load connection and disconnection, and changes in IG's unmodelled parameters, and voltage unbalance compensation, respectively. Frequency regulation is obtained by electronic load control connected to the DC bus of DSTATCOM. Experimental results were obtained to demonstrate the good performance of the voltage and frequency regulation control system during loads transient, including three-phase and single-phase loads.
This study deals with the development of a control system for voltage and frequency regulation of a micro hydro power generation system, fed by self-excited induction generator (IG). The generation system considers a four-wire three-phase grid, composed by three phases plus neutral conductor, fed by three-phase three-wires IG. The neutral conductor is created from the neutral point of star connection of excitation capacitors bank. The four-wire configuration allows the connection of three-phase loads in star or delta configuration, as well as single-phase loads. The voltage regulation is performed through a four-legs distribution static synchronous compensator (DSTATCOM) shunt connected to the AC bus. It is considered the employment of adaptive control techniques and the compensation of load current unbalances, which offers suitable voltage regulation in conditions of system's parameters variations such as load connection and disconnection, and changes in IG's unmodelled parameters, and voltage unbalance compensation, respectively. Frequency regulation is obtained by electronic load control connected to the DC bus of DSTATCOM. Experimental results were obtained to demonstrate the good performance of the voltage and frequency regulation control system during loads transient, including three-phase and single-phase loads.
Advances in the modeling and control of micro hydro power stations with induction generators
2011 IEEE Energy Conversion Congress and Exposition, 2011
The interest in technologies related to microgeneration has increased over the last decade. Hydro, wind and solar power represent some of the technologies which had significant improvement. Among these technologies, micro hydro power stations with self-excited induction generators (IG) became an excellent choice for limited power generation in isolated areas, due basically to its robustness and low cost, compared to
Induction Generator Control and Monitoring System for Micro-hydro Power Plants
2012
The study is concerned with the evaluation of the performance of a locally made Induction Generator Control and Monitoring System (IGCMS) for micro-hydro plants implemented using mark-space ratio technique in low-cost microcontrollers. The heart of a micro-hydro power plant is the generator, the device that converts mechanical energy into electrical energy. Most commonly used generators are the Synchronous generator (SG) and the Induction generator (IG). Induction generators have the advantage of being cheap, readily available, and robust. However, the difficulty in determining its capacitance requirements and of controlling its generated voltage and frequency under varying loads present major challenges. This paper proposes the use of low cost microcontroller based induction generator load control and monitoring system employing mark - space ratio technology. Results showed this to be a comparatively accurate and economical means of controlling micro hydro generators.
International Transactions on Electrical Energy Systems, 2016
This article describes an accurate steady-state analysis of a stand-alone 3-phase selfexcited induction generator (SEIG). This analysis, based on the Newton-Raphson algorithm, has shown that the system performance is greatly affected by the parameters related to the availability of primary energy, load variations, and excitation capacitor values. These parameters explain the stator voltage fluctuations and the output frequency decrease. To avoid any interruption of the excitation process and to ensure a good quality of the stand-alone minigrid, a three-phase voltage regulator (TPVR), based on switched capacitors, is proposed to keep the terminal SEIG voltage constant. The control algorithm and the regulation process are implemented using a microcontroller. The SEIG-TPVR is experimentally developed, and a variable capacitor bank is constructed. The experimental investigations on a 1.5-kW induction machine confirm the efficiency of the whole suggested system.
PWM-based Controller of Output Voltage for Wind- Driven Individual Self-Excited Induction Generator
Indian Journal of Science and Technology, 2016
Background/Objectives: The objective of this research owes to propose a fixed voltage controller for wind energy based individual Self-Excited Induction Generator (SEIG). The ideology is that simple as to exploit the use of a voltage source inverter, employing with the fundamental principle of PWM technique that in corporate an individual battery source for the smooth operation. Methods/Statistical Analysis: The incidence of depressed voltage regulation because of the unexpected alteration in the speed and the load is one of the main demerits of the SEIG. In order to overcome this complicated situation, a modification of phase shift in the sinusoidal PWM is introduced, which standardizes the voltage of SEIG, when it is subjected to unexpected alteration in the load. Findings: It is likely to attain a fixed value of voltage when the load is altered from empty load to the complete load. The simulation of the presented scheme has been carried out by MATLAB/SIMULINK modeling. The consistency of the proposed model is determined by the outcomes of the prototype testing. Application/Improvements: By varying the modulating index of the voltage source inverter, the stabilization of output voltage for SEIG has been achieved. One of its major advantages is that by simply checking the dc link voltage, the characteristics of the current state can be predictable.
Stand-alone micro-hydro power plant with induction generator supplying single phase loads
Journal of Renewable and Sustainable Energy, 2013
This paper presents a new method to supply single-phase loads using a three-phase induction generator (IG). The voltage and frequency regulation, as well as the phase IG phase balancing is ensured by a combination between a voltage source inverter (VSI) and a dump load (DL). Operating at constant frequency, the VSI keeps the system frequency also constant and deals with unbalances compensation, while the DL performs the voltage regulation. Through simulations and experiments the reliability of such a configuration is tested.
Renewable Energy - Recent Advances [Working Title]
Providing reliable and clean power from conventional grid in remote mountainous regions is always a challenging task due to tough geographical and climatic conditions. Renewable energy sources-based power plants such as small hydro power plants play a significant role in meeting the power requirements in these remote locations in mountainous regions. Synchronous generators are the most commonly used generators in small hydro power plants. However, with the advancement in controller technology for voltage and frequency control, induction generators are nowadays preferred in renewable energy conversion systems. Self-excited induction generators (SEIG) in small hydro power plants feeding isolated domestic loads are more suitable due to their inherent advantages as compared to conventional synchronous generators. This chapter deals with the usefulness of electronic load controller used in voltage and frequency control of self-excited induction generator used in small hydro power plant f...
Journal of Power Electronics, 2016
In recent years, some converter structures and analyzing methods for the voltage regulation of stand-alone self-excited induction generators (SEIGs) have been introduced. However, all of them are concerned with the three-phase voltage control of three-phase SEIGs or the single-phase voltage control of single-phase SEIGs for the operation of these machines under balanced load conditions. In this paper, each phase voltage is controlled separately through separated converters, which consist of a full-bridge diode rectifier and one-IGBT. For this purpose, the principle of the electronic load controllers supported by fuzzy logic is employed in the two-different proposed converter structures. While changing single phase consumer loads that are independent from each other, the output voltages of the generator are controlled independently by three-number of separated electronic load controllers (SELCs) in two different mode operations. The aim is to obtain a rated power from the SEIG via the switching of the dump loads to be the complement of consumer load variations. The transient and steady state behaviors of the whole system are investigated by simulation studies from the point of getting the design parameters, and experiments are carried out for validation of the results. The results illustrate that the proposed SELC system is capable of coping with independent consumer load variations to keep output voltage at a desired value for each phase. It is also available for unbalanced consumer load conditions. In addition, it is concluded that the proposed converter without a filter capacitor has less harmonics on the currents.
Performance Analysis of Self-Excited Induction Generator connected to a micro hydro turbine
In this paper, the performance of self-excited induction generator driven by hydro turbine is presented. Hydro- turbine is one of distributed generation which is used in rural areas. Self-Excited Induction Generator is usually connected to a wind turbine. Performance analysis for two identical self-excited induction generators driven micro-hydro turbine is studied. The mathematical model of the system which consists of the induction generator and the micro hydro-turbine is developed. MATLAB/Simulink software is used to simulate the system under steady state and transient operations. The results of simulation had been discussed, and from the results it proved that the model of two generators gives good dynamic and steady-state performance. A micro-hydro system can be installed easily and economically in remote locations/rural areas