Voltage Regulation of Wind Induction Generator (original) (raw)
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DESIGN AND CONTROL OF VOLTAGE REGULATORS FOR WIND DRIVEN SELF EXCITED INDUCTION GENERATOR
This paper deals with the performance analysis of static compensator (STATCOM) based voltage regulator for self excited induction generators (SEIGs) supplying balanced/unbalanced and linear/non linear loads. A three-phase insulated gate bipolar transistor (IGBT) based current controlled voltage source inverter (CC-VSI) known as STATCOM is used for harmonic elimination. It also provides the required reactive power SEIG needs to maintain a constant terminal voltage under varying loads. A set of voltage regulators are designed and their performance is simulated using SIMULINK to demonstrate their capabilities as a voltage regulator, a harmonic eliminator, a load balancer and a neutral current compensator. It also discusses the merits and demerits, to select a suitable topology of the voltage regulator according to self excited induction generator. The simulated results show that by using a STATCOM based voltage regulator the SEIG terminal voltage can be maintained constant and free from harmonics under linear/non linear and balanced/unbalanced loads.
Analysis, Voltage Control and Experiments on a Self Excited Induction Generator
In this paper dynamic analysis, closed loop voltage control and experiments on a self excited induction generator are presented. Electromagnetic torque, active power and reactive power are controlled under dynamic conditions of varied load, excitation capacitance and shaft speed, A closed loop voltage control scheme using a PWM Voltage Source Converter (VSC), dc link capacitor and a P-I voltage controller is proposed and implemented. This scheme generates constant voltage and variable frequency using the converter which also acts as a reactive power compensator. The frequency of stator voltage and current is varied by changing the error proportional gain making it attractive for wind energy conversion system. The simulation is done using MATLAB environment and the experimental results are also presented in this paper.
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.
Voltage control of Self-Excited Induction Generator
2014 IEEE 2nd International Conference on Electrical Energy Systems (ICEES), 2014
Self-excited induction generators (SEIG) are found to be most suitable candidate for wind energy conversion application required at remote windy locations. Such generators are not able to maintain the terminal voltage with load as, a literature survey reveals, the voltage profile falls sharply with load. In this paper an attempt has been made to improve the voltage profile of a self-excited induction generator. A new methodology based upon Genetic Algorithm (GA) is proposed to compute the steady state performance of the model including core loss branch. Further efforts are made to control the terminal voltage under loaded conditions. Simulated results using proposed modeling have been compared with experimental results. A close agreement between the computed and experimental results confirms the validity of the approach adopted.
Modelling and simulation of self-excited induction generator driven by a wind turbine
Eastern-European Journal of Enterprise Technologies, 2020
The excellent specifications of the isolated squirrel cage self-excited induction generator (SEIG) make it the first choice for use with renewable energy sources. However, poor voltage and frequency regulation (under load and speed perturbations) are the main problems with isolated SEIGs. Wide dependence on the SEIG requires prior knowledge of its behaviour with regard to variations in the input of mechanical power and output of electrical power to develop a control system that is capable of maintaining the voltage and frequency at rated values, as far as possible, with any change in the input or output power of the SEIG. In this paper, a mathematical model of a wind energy conversion system (WECS) based on a squirrel cage SEIG with a generalized impedance control (GIC) was built using the Matlab/ Simulink environment in a d-q stationary reference frame. A fuzzy logic controller (FLC) was used to control the parameters of the GIC. The training of the FLC was conducted by a neural network through Matlab's Neuro-Fuzzy designer. The results of this paper showed that the trained FLC succeeded in controlling the real and reactive power flow between the SEIG and the GIC system, in which the maximum variation for both magnitude and frequency of the generated voltage with any load or wind speed perturbation will not exceed (0.2 %) for the frequency and (3 %) for the voltage magnitude in both directions. The SEIG model was validated by comparing the results obtained with those of wellknown studies with the same rating and operating conditions
A simple model based control of self excited induction generators over a wide speed range
Self excited induction generators (SEIG) are widely used to harness energy from wind power. However, maintaining constant voltage output from SEIG with varying loads and wind speeds is still a major challenge. This paper proposes a control scheme which provides stable voltage output with changing loads and widely varying wind speeds. A capacitor is employed to provide the bulk excitation for the induction generator. An inverter with a photovoltaic (PV) module supplies the variable reactive current needed to regulate the generator output voltage under variable wind speeds and variable loads. Appropriate simulations and experiments with a laboratory prototype validate the proposed model.
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.
TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES20, 2020
The three-phase self-excited induction generator (SEIG) plays a basic rule in sources of renewable energy, such as wind turbines (WT). His main defect is poor regulation of output voltage and frequency under variable rotor speed and load conditions at stand-alone and isolated area operation mode. In this paper, a complete dynamic model of the SEIG-WT system is performed to analyze and study the system performance under transient and steady-state conditions. This dynamic model considers into account the effect of saturation in magnetizing inductance, cross-coupling magnetizing inductance, stator, and rotor leakage inductances, iron core resistance, and mechanical (friction and windage ) loss resistance, as well as the effect of stray load resistance, are considered in this model.New analytical formulas are used to accurate calculation of minimum and maximum values of excitation capacitance and generator rotor cut-off and maximum speed. The results of the dynamic model are partially compared with experimental results, and accurate agree are shown.
IEEE Transactions on Energy Conversion, 1987
power flow andi simultaneously keep the lagging reactive power burden on the generator This paper deals with dynamic modelling of to a minimum. self-excited induction generator connected to a supply system through a DC link (converter-A nonlinear model is developed by using line commutated inverter) and digital control the d-q model of induction generator and indesign for regulating the power transfer terfacisng to it the models of the subsystem4 through the link. Using different sampling viz. capacitors, converter, d.c link and inrates for the converter and inverter control verter appropriately. The objective of the loops, the proposed design ensures reduced modelling excludes the self-excitation proreactive power burden on the induction genercess of the induction generator and is aimed ator. Results of implementation on a labora-only at the bahaviour after self-excitation4 tory system are given. The validity of the developed model is experimentally tested using a prototype system.
Modelling and simulation of stand-alone self-excited induction generator for wind power application
2014
This dissertation would not have been possible without the guidance and the help of several individuals who in one way or another contributed and extended their valuable assistance in the preparing and completion this study. First and foremost, my utmost gratitude to Dr. Monalisa Pattnaik whose sincerity and encouragement I will never forget. Dr. Monalisa Pattnaik has been my inspiration as I hurdle all the obstacles in the completion of this research work. My sincere thanks to Prof. A.K. Panda, HOD of Electrical Engineering Department, and NIT Rourkela for providing valuable cooperation and needed advice generously all along my M.Tech study.