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In this paper a modification to dual comparison one cycle control is proposed which enables bi-directional power flow in single phase grid connected converters. Advantages of dual comparison one cycle control when compared to conventional one cycle control is that it does not give any steady state dc offset, no light load instability and unipolar pwm without having to sense the grid voltage. Modification...
The brushless DC (BLDC) motor can be controlled either by fixed dc link voltage control with Pulse Width Modulation (PWM) or by variable dc link voltage control with Pulse Amplitude Modulation (PAM). But neither of these can be a proper method for BLDC motor. Since the PWM control induces high current and torque ripple at high speeds and PAM control limits its application at low speeds due to the...
In recent times, along with the growth of the solar energy extractions, the grid connected solar inverters are gaining more popularity. The huge deployment of solar inverters may reduce the power quality of utility grid, if they deployed without proper power quality measures. As per the IEEE 1547 standards, the current total harmonic distortion (THD) should not be more that 3 % at the point of common...
An EV (Electric Vehicle) could play a prominent role in transport sector in terms of cost benefit and environment issues. A battery charger must have high efficiency and dependability with a unity power factor current drawn at its input AC mains since it is directly going to affect the charging time and life of the battery used in EV. Conventional AC-DC converter uses a diode bridge rectifier at the...
This paper discusses the different aspects of the interconnected operation of DC microgrid. Each source in a microgrid uses a proportional controller to eliminate the limitations of droop control. Effect of interconnecting line inductance and resistance on system stability is investigated using root locus plot. The sensitivity of different modes to the states of the system is analyzed using participation...
Modelling and simulation of emerging DC shipboard power system (SPS) is required to validate the hardware design, converter control and protection algorithms. As DC SPSs may be large and complicated, the simulation of such systems using high fidelity models generally consumes much time and the validation of performance using multiple test scenarios becomes impractical. An alternative method is to...
In DC microgrids, effective power management in real time is important for optimum management of energy, resources, storage elements and loads. Power imbalance in the grid may also lead to fluctuation of grid voltage, which will adversely affect the reliability of the microgrid and may damage the loads. In this paper, different strategies for power management in the DC microgrids will be classified...
A bidirectional converter based battery control of a SPV (Solar Photovoltaic)-hydro based microgrid system is designed and its performance is simulated in detail. In the proposed standalone microgrid system, the battery capacity is reduced to the order of 50%, which makes the system reliable as well as cost effective. The proposed system is a hydro-PV based isolated microgrid. The proposed system...
This paper presents a new hybrid control strategy for control of Dual Active Bridge (DAB) based DC-DC Converter for bidirectional power flow control aimed for storage systems. The problems of DAB based DC-DC converter, viz., peaking of inrush current, increased reactive power transaction, decreased power transfer capability, slow dynamic response, circulating current, to name a few, are shown addressed...
This paper proposes a smart parking station housing split voltage bidirectional converter for both vehicle battery charging(G2V) and discharging (for V2G) application with a control scheme for seamless grid integration for Plug-in Hybrid Electric Vehicle (PHEV). The converter topology is capable of charging/discharging the vehicle batteries with customized rates depending upon each individual vehicles...
A multilevel inverter based single stage grid connected solar PV system is proposed in this paper so as to reduce THD of the inverter voltage and reduce the size of filter circuit. A maximum power point tracking algorithm is implemented to obtain optimal performance of solar cell at different irradiance and temperature. Independent control of active and reactive power flow from inverter to the grid...
Bidirectional AC/DC power conversion has become very essential for any power electronic based industry. Pulse Width Modulated (PWM) Converters can be suggested as the best solution for rectifier as well as inverter modes of operation to achieve bidirectional power flow. In rectifier mode of operation, the converters are controlled to deliver regulated and ripple free DC output with high quality of...
The paper proposes a two input Switched Inductor Hybrid Buck-SEPIC DC-DC converter (TIHBSC) topology, for Low Voltage DC-grid (LVDG) applications. The projected topology is capable of providing extra bucking with one source. On account of excessive stepping down of the input dc voltage the converter uses additional energy storage components and hence it belongs to fifth order family. Power flow is...
This paper presents an active noise isolation (ANI) based control algorithm for single-phase single-stage solar photovoltaic (SPV) system connected to the AC grid. An ANI based algorithm used to control a voltage source inverter (VSI) which performs load compensation, harmonics mitigation, feeding solar power into the AC grid and many other power qualities issues. The proposed system comprises SPV...
The controller of a Conventional Unity Power factor correction (PFC) rectifier needs three feedback signals sensed from the converter, i.e., rectified input voltage, output voltage and input inductor current. Inductor current is sensed using current sensors, which are often expensive. Eliminating current sensors in PFC circuits is a subject of research interest. This paper gives a novel technique...
This paper proposes scheduling of induction generators on a DC microgrid system fed by multiple cage-rotor induction generators (CRIGs) to attain regulated voltage with minimal battery support. The capacity of each generator is selected such that next bigger generation unit is double that of previous i.e. the ratio 1∶2∶4∶8‥, which provides easy control of load-generation matching, duly supported by...
Nowadays, renewable energy technologies, such as solar power and wind power, are trend to replace conventional energy resources. In the meantime, DC Microgrid is becoming popular in distribution systems due to the better compatibility and simpler system control strategy. This paper presents a hierarchical coordinated control strategy for DC Microgrid with wind turbine and photovoltaic array under...
This paper proposes a self-tuning controller for a multi-level inductive Electric Vehicle (EV) battery charger application. By controlling the energy injection frequency of the Inductive Power Transfer (IPT) system, multiple charging levels (4 in number) are achieved. Maximum performance is leveraged by the proposed IPT system using its capability of self-tuning the switching operations to the natural...
In this paper a novel three stage control for squirrel cage induction generator (SCIG) fed to standalone system through back to back converter is presented. In the proposed technique dc bus voltage controller is implemented to regulate the output voltage of the stand alone system. The voltage controller is generating the speed command of the speed controller followed by inner current controller. The...
This paper describes a Sliding mode control (SMC) technique for a single - phase grid connected voltage source inverter (VSI) through LCL filter for distributed generation applications. SMC technique is applied as a control method with a fixed band hysteresis controller. Mathematical modeling of the VSI circuit is done through state space analysis. This control method provides robust current voltage...
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