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In this paper, four different single ended delay cells based ring oscillators have been presented. Output frequencies of ring oscillators have been controlled by varying the supply voltage 1.4V to 3.0V. The active load concept has been used in proposed circuits. First design shows frequency variation in the range [4.50–1.40] GHz with phase noise −87.79dBc/Hz @1MHz in saturated load. Second design...
In this paper the performance of Unified Power Quality Conditioner (UpQC) has been discussed for a Grid-connected Photovoltaic System. The described methodology focuses on Constant Sinusoidal Current Control Strategy based simulation of UPQC. The proposed methodology guarantees sinusoidal current to be drawn from the supply system even in case of non-linear loads. The system performance under variable...
Among all control methods for induction motor drives (IMD), Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters. In spite of its simplicity, DTC allows good torque control in both steady and transient state. DTC drives utilizing hysteresis comparators suffer from high torque ripple and variable switching frequency. Major drawback of Classical...
Distributed Static Synchronous Compensator (DSTATCOM) plays a key role in maintaining power quality on load side in distribution system. The paper investigates the dynamic operation of novel control scheme for DSTATCOM with 9-level inverter. The performance of proposed controller is simulated by the MATLAB/Simulink. The application of multilevel inverter is investigated in this paper. As per as advantages...
This paper illustrates the method of speed control of three phase Induction motor using V/F control method which is fed through the direct matrix converter. To make the input power factor unity, the rectifier side of the direct matrix converter is controlled through GSPWM technique. The main advantage of using the direct matrix converter is that the dc-link storage is removed in the proposed one which...
Smooth mode transfer of voltage source inverter (VSI) between grid-connected and stand-alone modes is achieved by operating the inverter in voltage control mode (VCM). However, this operation produces some adverse practical issues such as requirement of large rating VSI, limited real power injection by VSI, negligible operational capability in strong grid, frequent mode transfer, and reactive power...
This paper proposes a dual three-leg voltage source inverter (VSI) based distribution static compensator (DSTAT-COM) to compensate unbalanced and nonlinear loads in three-phase four-wire distribution systems. The proposed topology uses two three-leg inverters having common dc-link with single dc capacitor and an additional small capacitor connected from the negative terminal of VSI to the system neutral...
This paper presents a dual voltage source inverter (DVSI) scheme to enhance the power quality and reliability of the microgrid system. The proposed scheme is comprised of two inverters, which enables the microgrid to exchange power generated by the distributed energy resources (DERs) and also to compensate the local unbalanced and nonlinear load. The control algorithms are developed based on instantaneous...
Space vector modulated voltage-source inverters require an overmodulation algorithm for continuous control of line-side voltage during overmodulation and for a smooth transition from PWM to six-step mode. Overmodulation increases the dc bus utilisation of a voltage source inverter, but requires significantly higher computational effort than linear modulation. This paper proposes a novel single-zone...
This paper presents a power sharing control algorithm for parallel grid interactive multifunctional voltage source inverters (PGMVSIs) which are connected to distributed renewable energy sources. The main objective of this scheme is to get proportional power sharing among PGMVSIs, so as to make the grid current balanced sinusoidal and at unity power factor. The control algorithm is derived using instantaneous...
With the increase in power demand power generated has also increased as a result, some transmission lines are heavily loaded and thus the system stability has become the power transfer limiting factor. The various power system steady state problems are solved by using Flexible AC Transmission Systems (FACTS). Interline Power Flow Controller (IPFC) is a versatile device that is used to control the...
Hybrid power systems are considered as a reliable and viable option for the electrification of rural villages which are beyond the reach of grid electricity. Many such renewable based off-grid power systems working mostly in India and Africa are generating power which are not at par with grid power. The control of power among different renewable sources while maintaining the power quality of supply,...
In this paper an analog to digital converter architecture is introduced. The proposed design is based on a mixed approach of flash type ADC and SAR type ADC. This design offers lesser number of comparators and so low power consumption with much less circuit complexity in comparison to conventional flash ADC architecture. Based on the proposed idea, a 4-bit ADC is simulated in Cadence virtuoso Tool...
Indirect Field Oriented Control is a control technique used in AC drive systems to obtain high performance torque control. Sine pulse width Modulation is used for control the three level diode clamped inverter. In these applications, a rotational transducer such as a shaft encoder senses the speed of rotor. PI controller is then used to alter the firing pulse of three level diode clamped inverter...
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