STATCOM-based voltage and frequency regulator for stand-alone asynchronous generator (original) (raw)
Related papers
STATCOM based voltage-frequency regulation for SEIG driven by an uncontrolled speed turbine
International Journal of Power and Energy Conversion, 2009
This article presents the analysis and the control of a stand-alone self excited induction generator (SEIG) intended for rural applications. SEIG along with the STATCOM with battery energy storage (BES) in its DC side makes it possible to control the terminal voltage and frequency during rotor speed and load variation. Constant frequency control is carried out by the load angle 'δ', without rotor speed control, while constant terminal voltage control is achieved via the modulation index 'm'. The 'SEIG' magnetisation characteristic and the 'STATCOM' rating are taken into consideration to determine the load interval where the terminal voltage and frequency can be controlled. The simulation results show good performances of the SEIG-STATCOM system under different perturbations.
This paper presents the design of VSI based STATCOM for eliminating harmonic currents due to non linear load and to compensate the reactive power in grid connected system. The Static Synchronous Compensator (STATCOM) is increasingly popular in power quality application. This VSI draw or supply a compensating current from the utility such that it cancels current harmonics on the AC side. STATCOM generates a current wave such that it compensate by cancelling out the non-linear current waveform generated by load. The performance of the wind turbine and thereby power quality are determined on the basis of measurements and the norms followed according to the guideline specified in International Electro-technical Commission standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operation and these are measured according to national/international guidelines.The STATCOM control scheme for the grid connected wind energy generation system for power quality improvement is simulated using MATLAB/SIMULINK in power system block set. Finally the proposed scheme is applied for both balanced and unbalanced linear non linear loads.
2017
In this paper, an electronic voltage and frequency (EVFC) controller has been implemented and simulated in MATLAB/SIMULINK Simpower System Blockset to regulate voltage and frequency of a IAG feeding three-phase balanced and unbalanced linear and non-linear consumer load for constant power applications such as uncontrolled turbine in Pico hydro power generation (<10kW). The EVFC consists of a diode bridge rectifier, IGBT based chopper switch, dc filtering capacitor, PI controller and a resistive Dump load. The steady state and transient behaviour of IAG-EVFC system is examined and studied under different operating conditions to demonstrate the capabilities and effectiveness of electronic voltage and frequency controller (EVFC). The switching ON and OFF like operating condition of balanced and unbalanced load of consumer are obtained by adding circuit breakers in the Simulink model of the system under study
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.
Voltage and Frequency Controller for An Autonomous Asynchronous Generator
International Journal on Electrical Engineering and Informatics, 2014
A battery Energy storage system (BESS) based voltage and frequency controller (VFC), for an Autonomous Asynchronous Generator (ASG) driven by an uncontrolled pico hydro turbine used in constant power mode, is presented in this paper. Excitation of the asynchronous generator with capacitor bank enables it to generate rated voltage at no load. The additional reactive power demand of the ASG on load and that for the load itself is provided by the VFC. The proposed controller has the capability of harmonic reduction, load balancing and load leveling along with voltage and frequency control. The VFC has been realized using an IGBT based current controlled voltage source converter (CC-VSC) having a battery at its DC link. A simple and effective linear control scheme using SPWM control has been used to control the CC-VSC. This control scheme is easier to implement on hardware than the other reported schemes, as it involves only linear PI controllers. The effectiveness of the proposed controller for an autonomous generator is demonstrated by simulation on MATLAB platform.
International Journal of Electrical and Computer Engineering (IJECE)
Self-Excited induction generators (SEIG) display a low voltage and frequency regulation due to variable applied load and input rotation speed. Current work presents a simulation and performance analysis of a three-phase wind-driven, SEIG connect to a three-phase load. In addition, an investigation of the dynamic operation of the induction generator from starting steady state until no-load operation. It is assumed that the input mechanical power is constant where the rotor of the SEIG rotates at a constant speed. The value of the excitation capacitance which is necessary to the operation of the induction generator also computed to ensure a smooth and self-excitation starting. The output voltage of the generator is adjusted by varying the reactive power injected by STATCOM. A 3-phase IGBT voltage source inverter with a fuel cell input supply is connected as STATCOM which is used to compensate for the reduction in the supply voltage and its frequency due to variation occurred in the ap...
A Voltage Regulator for Parallel Operated Isolated Synchronous Generators Using Statcom
2014
Reactive power (vars) is required to maintain the voltage to deliver active power through transmission lines. Generator and other loads require reactive power to convert the flow of electrons into useful work. When there is not enough reactive power, the voltage sags down and it is not possible to push the power demanded by loads through the lines. Thus reactive power is injected using the compensating device STATCOM.The Paper deals on static synchronous compensator (STATCOM) which is connected to the parallel operated isolated synchronous generators to drive a 3-phase load. These generators are driven by constant prime mover like diesel engine,bio-mass,gasoline,steam turbine etc.Three single phase IGBT based Voltage source converter (VSC) along with 3-single phase transformers and self supported D.C bus is used as a voltage controller. The project deals with controlling a STATCOM using non-linear techniques that involves hysteresis current control and Park’s transformation. The vol...
Voltage and frequency control of asynchronous generator for stand-alone wind power generation
IET Power Electronics, 2011
A synchronous detection-based control algorithm for voltage and frequency control (VFC) of an isolated asynchronous generator (IAG) is proposed for a stand-alone wind energy conversion system (SWECS). A three-legged voltage source converter (VSC) with an isolated star/polygon transformer is used as an integrated VSC. The integrated VSC with a battery energy storage system is used to control the active and reactive powers of the SWECS. The SWECS is modelled and simulated in the MATLAB using the Simulink and the sim power system toolboxes. Test results on the developed prototype of SWECS are also presented to validate the control algorithm. The proposed VFC functions as a voltage and frequency regulator, a load leveller, a load balancer and a harmonics filter in the SWECS. P * g , Q * g reference active and reactive source powers V, V L , m RMS value of generator phase and line voltage, modulation index V am , V bm , V cm amplitude of phase voltage for phases 'a', 'b ' and 'c ' v aq , v bq , v cq quadrature phase voltages for phase 'a ', 'b' and 'c ' V AB , V BC , V CA star-polygon transformer secondary line voltages V t , V T amplitude of terminal phase voltage, sum of peak of phase voltages 8 References
Electric Power Systems Research, 2017
This paper deals with the development of a new hybrid topology for voltage and frequency regulation in stand-alone micro hydro generation systems based on self-excited induction generator (SEIG). As the main contribution, the new topology proposes the rating reduction of DSTATCOM to a small part of the generated power with high voltage regulation quality. The proposed hybrid topology consist of a threephase four legs distribution static synchronous compensator (DSTATCOM) and switched capacitor banks (SCB) connected in parallel to the point of common coupling (PCC) of a three-phase four-wire system. Voltage and frequency regulation are achieved by the association of DSTATCOM, SCB and electronic load control (ELC), this last connected by means of an uncontrolled rectifier, directly to the PCC. The association of such distinguished elements with different characteristics and the employment of suitable control techniques guarantee the voltage and frequency regulation in accordance to the international standards. Simulation and experimental results are presented to demonstrate the performance of the proposed hybrid topology on the rating reduction of DSTATCOM with efficient voltage and frequency regulation of a proposed SEIG based generation system.