Satyaranjan Jena

Comparative study between adaptive hysteresis and SVPWM current control for grid-connected inverter system

Now a days distributed generation (DG) system uses current regulated PWM voltage source inverters (VSI) for connecting the utility grid with DG source in order to meet the following objectives: 1) To ensure the grid stability 2) active and reactive power control through voltage and frequency control 3) Improvement of power quality (i.e. harmonic mitigation) etc. In this paper the comparative study between adaptive hysteresis and SVPWM current controller is presented in order to ensure the sinusoidal current injected in to the grid. The performance indices include THD of the grid current, fast current tracking during steady state and transient conditions. SVPWM current controller ensures less THD of the grid current at PCC, better dc-link voltage utilization over adaptive hysteresis current controller. The studied system is modeled and simulated in the MATLAB Simulink environment.

Power quality improvement of 1-Φ grid-connected PWM inverter using fuzzy with hysteresis current controller

The ever mounting demand of electrical energy and the keen scarcity of conventional energy sources leads to the burgeon of distributed generation (DG) system. The main abstruse is the harmonization of the DG to the utility grid. Generally current regulated PWM voltage-source inverters (VSI) are used for synchronizing the utility grid with DG source in order to meet the following objectives: 1) To ensure grid stability 2) active and reactive power control through voltage and frequency control 3) power quality improvement (i.e. harmonic elimination) etc. In this paper, fuzzy with hysteresis controller is proposed to enhance the power quality by diminishing current error at higher band width. The studied system is modeled and simulated in the MATLAB/Simulink environment and the results obtained are compared with conventional hysteresis controller.

Dynamic performance of adaptive hysteresis current controller for mains-connected inverter system

In most of the situations, power electronics converters are mainly used as an interfacing device between distributed generation (DG) system and utility grid in order to meet the following objectives: 1) grid synchronization 2) active and reactive power control through voltage and frequency control 3) improvement of power quality (i.e. harmonic elimination) etc. But due to wide variation of the reactive power in the consumers-end, the voltage at the point of common coupling (PCC) is usually affected. In this paper adaptive hysteresis current controller is proposed for inverter-interfaced grid connected system in order to meet the active and reactive power demand during load variations and both can be controlled independently. The proposed controller reduces the current harmonic at PCC considerably. It observes that the adaptive hysteresis current controller can provide the low switching frequency of operation of inverter switches irrespective of load variations and it ensures lower total harmonic distortion (THD). The studied system is modeled and simulated in the MATLAB Simulink environment.

Performance improvement of single-phase grid — Connected PWM inverter using PI with hysteresis current controller

Now a days distributed generation (DG) system uses current regulated PWM voltage-source inverters (VSI) for synchronizing the utility grid with DG source in order to meet the following objectives: 1) To ensure grid stability 2) active and reactive power control through voltage and frequency control 3) power quality improvement (i.e. harmonic elimination) etc. In this paper the comparative study between hysteresis and proportional integral (PI) with hysteresis current controller is presented for 1-Φ grid connected inverter system. The main advantage of hysteresis+PI current controller is low total harmonic distortion (THD) at the point of common coupling (PCC) at a higher band width of the hysteresis band. The studied system is modeled and simulated in the MATLAB Simulink environment.

Experimental study on adaptive hysteresis current controller for inverter-interfaced 1-Φ grid connected system

In the present scenario distributed generation (DG) system uses current regulated PWM voltage-source inverters (VSI) for synchronizing the utility grid with DG source in order to meet the following objectives: 1) ensure grid stability 2) active and reactive power control through voltage and frequency control 3) power quality improvement (i.e. harmonic elimination) etc. In this paper the comparative study between adaptive hysteresis and hysteresis current controller is presented for 1-Φ grid connected inverter system. The main advantages of adaptive hysteresis current controller are constant switching frequency of operation, better dc-bus voltage utilization, simple filter design and low total harmonic distortion (THD) at the point of common coupling (PCC). The studied system is modeled and simulated in the MATLAB-Simulink environment. Further, an experimental work has been carried out in the laboratory set-up in the discrete-domain via TMS320F2812 digital signal processor (DSP) and we could find there is an effective validation with simulated results.

Reactive power compensation in inverter-interfaced distributed generation

The consumption of reactive power is stochastic in nature for the distribution system. This uncertain variation of the reactive power leads to 1) Variation of voltage at the point of common coupling(PCC) 2)Low power factor 3)low efficiency 4) improper utilization of distribution system and 5) loss of synchronism for a grid connected inverter based — distributed generation. Now a days distributed generation (DG) system uses current regulated PWM voltage-source inverters (VSI) for synchronizing the utility grid with DG source in order to ensure the grid stability. In this paper reactive power compensation based hysteresis controller and adaptive hysteresis controller is analyzed for inverter interfaced DG which can control the active and reactive power independently. The adaptive hysteresis controller can reduce the current harmonic at PCC considerably which ensures lower total harmonic distortion (THD). The performance indices include THD of the grid current, fast current tracking during steady state and transient conditions. The studied system is modeled and simulated in the MATLAB Simulink environment.

Effect of irradiance onyield factor of solar photovoltaic plant — A case study

Now a days for different application, the alternate energy solution is the solar energy. It may be a standalone system to provide power to the remote area or it may be grid connected system. The isolated PV system is always connected to a storage device to store the surplus power when the available power output is sufficient. Whereas grid integrated PV systems are more reliable. As the PV power is directly injected to the grid so many issues arises during the interconnection because of intermittent nature of the input energy. The main reason for fluctuation power is change in irradiance in this paper an experimental study as well as a case study is carried out to find effect of irradiance on the yield factor of the solar power plant.

Power quality improvement of 1-φ grid integrated pulse width modulated voltage source inverter using hysteresis Current Controller with offset band

At present-day scenario, renewable energy sources become a substitute source of energy to reduce environment pollution and future energy demand. Commonly pulse width modulated voltage source inverter is widely used for the interconnecting renewable to the existing grid. For the control of the converter hysteresis current controller is one of the popular control strategies. But hysteresis Current Controller has the drawback of inconsistence switching frequency. In this paper a hysteresis current controller with offset band for single phase grid integrated pulse width modulated voltage source inverter has been implemented. In the conventional hysteresis current controller an offset band is introduced for considerable diminution in switching frequency and better power quality. The MATLAB-Simulink environment is used to model, study and simulate the system.

Current harmonics reduction of three phase grid connected pulse width modulated voltage source inverter by hysteresis current controller with offset band

The development of power electronics technology gives ample of opportunity for the grid integration of renewable in an efficient way. Commonly pulse width modulated voltage source inverter is widely used for this purpose. The control technique of grid integrated inverters plays a major role for the reduction of harmonic and improvement of power quality in the system. The most commonly used current control technique for the control of the inverter is hysteresis current controller strategies. But the main drawback hysteresis current controller is the uneven switching frequency and higher harmonic distortion. In this paper a hysteresis current controller with offset band for three phase grid integrated pulse width modulated voltage source inverter has been implemented for considerable reduction of harmonic distortion and better power quality. The MATLAB-Simulink environment is used to model, study and simulate the system.

Modified hysteresis current-controlled PWM strategy for Single phase grid connected inverters

As the power demand increases rapidly in the electricity market the use of renewable energy sources also increasing. Renewable sources are significantly different from the traditional power sources due to their stochastic nature. Therefore it is a tough task to integrate renewable energy sources with the existing utility grid. In order to ensure the grid reliability, current controlled Pulse Width Modulated VSI is used to interface renewable energy sources with utility grid. This paper presents a relative analysis between Conventional Hysteresis Current Controller (CHCC) and Modified Hysteresis Current Controller (MHCC) for 1-Φ grid integrated inverter system. The benefit MHCC is, it avoids short circuiting of the DC link voltage. Further MHCC gives more sinusoidal current and lesser THD than that of CHCC. The MATLAB Simulink environment is used to model, study and stimulate the system.