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Synchronization of EV to distribution grid is gaining attention as the vehicle will coordinate to distribution grid ensuring good power quality. Reduce the charging time of EV is one of the key goals in making user-friendly environment for electric vehicles. In this context, fast DC charging gives an interesting opportunity. This paper develops a Simulink model of synchronized charging and discharging...
Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to make full utilization of the PV array output power which depends on solar irradiation and cell temperature. This paper proposes simulation and hardware of a grid connected photovoltaic system which is interfaced with the power system network through a DC-DC boost converter. The maximum power point tracking...
This paper addresses the modeling and control of the grid connected photovoltaic system. The system contains a PV panel that converts irradiation to electrical power, a boost converter which increases the voltage of the PV, and a grid connected inverter to convert the DC power to three Phases AC power. MPPT control is developed in order to track the maximum power provided by the photovoltaic generator...
In this paper, a fast-synchronization between grid and inverter based on virtual synchronous converter (VSCon) technique is achieved in single-phase inverter. Consequently, this technique is designed and simulated in Matlab/Simulink platform to perceive the significances during variation of grid load parameters. The VSCon is implemented for inverter output control that has a behavior of grid voltage...
The operation of grid side converters (GSC) is significant in its robust control design. Phase locked loop (PLL) algorithm is introduced to acquire synchronization and perfect operation of GSC. The control design depends on rapid and exact tracking of phase angle of grid voltage. The task of PLL is crucial condition, since grid connected system is to operate the power system under grid fault conditions...
This paper proposes single-phase power conditioning system which is capable of connecting a microgrid to an utility grid seamlessly through slew-rate control. The power conditioning system is composed of a single-phase phase-locked loop using an inverse Park transformation to detect the grid phase, a phase synchronizer using the slew-rate control, and isolated bidirectional inverter which transfers...
With the ever growing demand for power and development of renewable energy technologies, the concepts of distributed generation and microgrids are quickly coming to the forefront. A microgrid is an electrical power grid where the load and power generation are within close proximity. Increasingly educational institutions are trying to capitalize on the need to educate future and current professional...
Startup of any converter is a very dynamic and hardly controllable process. The regulator outputs are fluctuating, sensor readings are constantly changing and the fault probability is the highest. That is especially true for grid connected converters that need to be exactly in phase with the grid before an actual connection is done. In this paper a startup strategy for a grid connected PV micro inverter...
In this paper we propose the structure and the functioning of a photovoltaic (PV) connected to the electric distribution and transmission network, equipped with the malfunction detection blocks. The studies that were carried focused on the injection of a power of 16 KW, produced by a PV panel field, on the electrical network of medium voltage (25 KV). In order to the reliability of the injection system...
This paper presents a Solid State Transformer (SST) interface for grid connected Photovoltaic (PV) system. A new method is proposed for Maximum Power Point Tracking (MPPT) through a single phase inverter with phase displacement control. The inverter control variable is redefined such that it can be used for MPPT. Due to this control technique one converter stage for power tracking is eliminated, leading...
This manuscript presents modified scheme of synchronous space-vector modulation allowing providing nonlinear dependences between the fundamental voltage and fundamental frequency of dual three-phase open-winding ac drive with four modulated inverters. Behavior of the system with six control modes (characterized by different dc-voltages and switching frequencies of inverters) and two nonlinear Voltage/Frequency...
Current controlled inverters need to be dynamic and robust even under grid disturbances and different grid faults. Besides a robust control method the requirements for synchronization of the system become more and more important especially when multilevel inverter topologies are used. The combination of direct current control methods and advanced grid synchronization techniques promise excellent working...
This paper proposes a bi-directional grid-tied converter with GPS capability for smart-grid applications. The novelty of this converter is that time-stamped grid voltage angle received via network communication channels has been used to synchronize the converter to the grid. Therefore, all grid-tied converters in a microgrid with this development will not require line voltage sensing and phase-locked...
Distributed ac power systems using inverters connected in parallel are becoming increasingly widespread with the development of autonomous microgrids. Inverters can be controlled to emulate the dynamics of nonlinear oscillators, such that multiple inverters coupled through an electrical network will synchronize and share load in proportion to their ratings. In this paper, a communication-less control...
The distributed inverters are integrated into grid without coordinated PWM and the switching ripples of inverters are randomly accumulated at point of common coupling (PCC). Global synchronous pulse width modulation (GSPWM) can attenuate the accumulated switching ripples. This paper proposes time compensation method which compensates the time delay of synchronization signals for inverters in distance...
This paper presents a novel active synchronization control strategy of multi-bus microgrid based on distributed cooperation technology. The method can reconnect microgrid back to utility grid (UG) seamlessly with sparse communication channels. Through the cross product of voltage vectors in the synchronizer, the frequency and phase of microgrid can track the main grid simultaneously. The voltage differences...
This paper focuses on pulse-width modulation (PWM) strategies that aim at cancelling common-mode (CM) voltage generated by power converters. In the typical use case of frequency converters, such strategies perform simultaneous switching between different inverter legs, so that their effects on CM voltage cancel each other. Doing so, the resulting CM voltage is reduced to mere commutation residues...
With more and more distributed and renewable energy sources connected to the utility network, it will introduce different dynamics to the system, and power electronics interfaces are needed to enable efficient and flexible interconnections among different players. Based on Internal Model Principle, sinusoidal denominator can be included in the cascaded controller for DC-AC inverter to achieve the...
This paper investigates the operation of an active filter configuration to eliminate the dominant harmonics from a low frequency (50 Hz) square wave Voltage Source Inverter (VSI). VSIs are playing a vital in industry for medium voltage high power drive applications. For high power drives the inverter switching frequency should be less to minimize the switching losses of power semiconductor devices...
The synchronous inverter is an electrical inverter device which is synchronizing inverter phase into the micro-grid phase at the same amplitude and frequency. A three phase phase synchronous inverter (PSI) is basically used in the high efficiency power supply systems. The inverter phase is depend on the controllers which are two level pulse width modulation (PWM) generator, phase lock loop (PLL) regulator,...
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