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As there is a power shortage across any country, usage of renewable energy sources is being encouraged nowadays. This energy produced has to be properly synchronized with the grid to ensure safety and energy continuity. In this paper, a step by step procedure for designing a MPPT algorithm based photovoltaic (PV) generation system is presented. Moreover, the standard procedure for grid interconnection...
In this paper, an attempt to implement auto synchronization technique using Charge Pump Phase Locked Loop (CPPLL) for grid connected solar photovoltaic system (SPV) has been made. The main aim of this paper is to reduce the phase angle mismatch between the grid voltage and inverter voltage, which in turn would improve the quality of power delivered by eliminating the unwanted islanding condition....
Nowadays multilevel inverters are promising as a new breed in high/medium voltage and power applications. Number of modulation techniques is available for controlling the multilevel inverter but multi-carrier pulse width modulation (MCPWM) techniques are frequently used due to its simplicity and easy implementation. In this paper simplified simulation modeling of various MCPWM techniques are proposed...
This paper proposes a new topology of multilevel inverters with asymmetrical commutation cell that consists of three sources and six switches to synthesize asymmetrical output voltage level. This category of topologies is typically used in voltage AC generation. The structure provides multilevel waveform utilizing reduced number of components as compared to the conventional topologies. The performance...
This paper investigates the modern topology of multilevel converters, which are suitable for use in high power photovoltaic applications with the focus on achieving lower total harmonic distortion and better efficiency. Multilevel converters offer several advantages compared to conventional types. Multilevel converters provide high quality output while using the low switching frequency. It affects...
This paper deals with a switched boost inverter (SBI) applicable for solar photovoltaic system (PV) interfaced micro-grid. SBI is a single stage power converter which can supply both dc and ac loads simultaneously which is suitable for microgrid applications. The output voltage of SBI can be either greater or less than its input dc voltage. Also, this converter allows shoot-through of the inverter...
For medium and high voltage applications, Multilevel inverters have been widely used as a important devices. The advantages of multilevel inverters include low electromagnetic interference (EMI) outputs, low power dissipation, low harmonic etc. The most common multilevel inverter topology is cascaded H-bridge topology constituted by IGBT semiconductors. The most common switching technology used is...
In a last few decades, development in power electronics systems has created its necessity in industrial and domestic applications like electric drives, UPS, solar and wind power conversion and many more. This paper presents the design, simulation, analysis and fabrication of a three phase, two-level inverter. The Space Vector Pulse Width Modulation (SVPWM) technique is used for the generation of gating...
This paper presents prototype development of a three-phase bridge inverter for PV applications using dSPACE 1104 hardware interface with Matlab/Simulink software. It is evident that a PV system requires an inverter to generate ac power to make it available to the consumers at the utility. Firstly, the three-phase inverter model is built in Matlab Simulink and the control strategy used is current controlled...
In this paper, we present a system used a Permanent Magnet Synchronous Generator (PMSG) applied to wind energy, to generate electricity and inject it into home network. The objective is to perform modeling and nonlinear control system, and then the objective of the control is: enforcing power factor correction (PFC) with respect to the power grid. First part, we present the mathematical model of the...
In this paper, two topologies are presented for solar PV system, namely voltage lifting ZSI and voltage lifting Improved ZSI. These proposed inverters possess very high voltage boost. By replacing the middle diode in one of the switched inductor (SL) cell of SL-ZSI/2SL-qZSI with capacitor (CVL) high voltage gain can be obtained and also number of L, C and diodes gets reduced, which reduces weight,...
During recent years, most of the attention to multilevel inverters has been focused on control algorithm. While, the defects of SVPWM algorithm is caused by classic space vector theory based on traditional coordinate system such as mass of computation and low efficient of controller. In this framework, this paper presents a new simplified space vector modulation scheme, which is based on G-H coordinate...
This paper introduces the failure operation principle of the capacitive floating level shifter, as well as its simplified circuit model. Based on the model, the mathematical equations for analyzing the level shifter's characteristics and its respective performances are also derived. Design criteria for the capacitive floating level shifter are proposed derived from the model and corresponding MATLAB...
The operating conditions of UPS inverters and the fact that the load is unknown lead to great difficulties in fault diagnosis. This paper proposes the use of a fault diagnosis algorithm based on estimated pole voltage error for UPS inverters based on the 3-level Neutral-Point-Clamped topology. This algorithm is independent from the load and is not affected by unbalanced three-phase operation. This...
Maintaining power quality in microgrid which is a building block of smart gridis very important issue. A small deviation in control variables of any source in a microgrid can lead to circulating current, which can cause malfunction of entire system. Circulating current, plays a major role in affecting the power quality. In this paper two control schemesto control the circulating current are proposed...
This paper presents the variable-speed permanent magnet synchronous generator wind power system using the diode bridge rectification circuit for the converter. The wind speed model which simulates the actual wind is investigated, and it is realized as the Simulink model. The parameters of the permanent magnet synchronous generator are measured and the generator torque characteristic using the obtained...
This paper proposes a single-stage inverter topology for grid connected PV systems. Isolated voltage generated by the solar modules is effectively used in a neutral point clamped multilevel inverter to generate high quality AC voltage for feeding into the grid. The control scheme is implemented in synchronously rotating reference frame for independent control of active and reactive power. Loss calculation...
Permanent Magnet Synchronous Motor (PMSM) with lower inductance values suffering from the narrow Constant Power Speed Range (CPSR). The traditional approaches for extending CPSR operation included adding an additional inductance or a thyristor controlled inductance in series with the motor. However, these approaches increase the cost, complexity, and derate the inverter of the drive system. In this...
In today's world the demand of energy is incredibly high and non- renewable resource such as ore, fossil fuel and nuclear fuel are not sufficient to meet this demand. Eventually renewable energy is a better choice. There is an increasing trend of using solar cell in the industry as well as to household appliance because solar energy is expected to play a prominent role in future smart grid as a distributed...
This paper presents the transfer function modeling and stability analysis of two induction motors of same ratings and parameters connected in parallel. The induction motors are controlled by a single inverter and the entire drive system is modeled using transfer function in LabView. Further, the software is used to perform the stability analysis of the parallel connected induction motor drive under...
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