Implementation of grid interfaced photovoltaic system with active power filter capabilities

Self Cite

Summary A new topology for solar water pumping (SWP) using a permanent magnet synchronous motor drive is proposed in this work. With the aim of overcoming the intermittency issues of solar photovoltaic (PV) generation, the utility grid is introduced in order to provide a reliable water pumping operation. The grid interface is facilitated using a Vienna rectifier, which enables the rated operation of the pump. The Vienna rectifier maintains the direct current (DC) link voltage, removes the grid current harmonics, and ensures unity power factor at the grid. A novel multi‐resonant second‐order generalized integrator frequency‐locked loop (FLL)–based approach is proposed for extraction of fundamental positive sequence components from the grid voltages. The novelty of the proposed control approach lies in the elimination of dominant lower order harmonics from the sensed grid voltages through selective harmonic elimination. The FLL structure makes the control structure flexible to grid frequency change within small range. The optimum power point of solar PV array is extracted using an incremental conductance scheme. A sensorless field‐oriented control is used for regulating the pump speed. The system ) performance is observed under different operating conditions on a laboratory developed prototype. Test results confirm the satisfactory performance and improved power quality indices fulfilling the IEEE‐519 standard.

Section: Introductionmentioning

confidence: 99%

Power quality improvement in grid integrated solar water pumping system using Vienna converter

Murshid

Singh

2019

Self Cite

“…These oscillations and variations affect the injected inverter current into the grid and their reference current generation during transients. 3 DC-link reference voltage in a single-stage grid-tied PV system is floating in nature, which is controlled through different maximum power point tracking (MPPT) techniques. 4 However, these techniques have not considered the effects of abrupt irradiation change on the reference DC-link voltage, and hence, the dynamics of the system becomes very poor.…”

Section: Introductionmentioning

confidence: 99%

Experimental prototype of a novel feed forward compensation for DC‐link voltage stabilization in grid‐tied PV system

Kumar

Gupta

2019

Summary DC‐link voltage control is an eminent attribute of grid‐tied photovoltaic (PV) systems, and it is maintained at 10% to 15% higher than the peak of supply voltage to control the flow of active power. However, large variations in amplitude of supply voltage, compensating current, and PV current affect the recital of DC‐link voltage controller, which further deteriorates the performance of control algorithm. This paper presents a small signal analysis using instantaneous power balance on both sides of inverter for DC‐link voltage stabilization. A novel feed forward compensation (FFC) technique is proposed for mitigating the effects of external disturbances. Active current detection technique is also proposed for load current decomposition and compensating current detection which is needed for FFC technique design. An integral time absolute error criterion is used for collecting the error generated by the floating nature of DC‐link voltage reference. This generated error is minimized by optimal tuning of the proportional controller using gravitational search algorithm. The effectiveness of the proposed controller is validated using sensitivity analysis. The dynamic performance of the proposed control technique is tested and verified using MATLAB/Simulink. Hardware prototype using a cost‐effective Arm Cortex M4 microcontroller (STM32F407VGT6) is also presented to validate the simulation results.

“…Thus, active power filter (APF) is introduced to overcome these problems. Among different types of APF, shunt APF (SAPF) has been widely applicable as a viable solution …”

Section: Introductionmentioning

confidence: 99%

“…Solar PV power generation has been widely used to meet the energy demand which improves the reliability and power quality while reducing the burden on the central grid. Recently, power quality issues in the grid‐tied system have been addressed by the use of more advanced APF technology . However, SAPF is the most dominant solution to mitigate the power quality problems.…”

Section: Introductionmentioning

confidence: 99%

“…The fundamental current extraction technique presented in Singh et al shows superior performance than the conventional technique, but real‐time implementation of this technique is difficult and steady‐state performance of the discussed control technique is poor. In Ribeiro et al, a hybrid control technique combining the sliding mode control with conventional PI control and second‐order generalized integrator (SOGI)‐based control in Singh et al has been implemented for power quality improvement. Robust dynamic performance of grid‐tied PV system using a novel SOGI‐based control algorithm has been validated in Vedantham et al…”

Section: Introductionmentioning

confidence: 99%

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Kalman filter variant intelligent control for power quality improvement in photovoltaic active power filter system

Prince

Panda

2019

Summary The increased usage of nonlinear loads in the distribution system network with deep integration of renewable energy sources imposes the need for advanced control to improve power quality. With the objective to attain desired sinusoidal voltage waveshape at the common utility point, unity power factor operation, and reduction in harmonics, a swarm intelligent enhanced dual extended Kalman filter (DEKF) control technique for improving the performance of shunt active power filter (SAPF) is proposed in this paper. A photovoltaic (PV) array is integrated at the DC‐bus which supplies the required load power thus reducing the grid power demand. A single sensor‐based control is used to track the maximum power from the two‐stage PV array. The enhancement of the SAPF performance requires proper tuning of parameters; constriction factor‐based particle swarm optimization (PSO) is adopted in this regard. The DEKF estimates both state and parameter from the nonlinear system for generating a reference signal. The performance of the proposed control algorithm is compared with the Extended Kalman filter (EKF)‐based PV‐SAPF system using MATLAB/Simulink. To verify the efficacy of the controller, an experimental PV‐SAPF prototype is developed in the laboratory and tested under balanced and unbalanced supply, dynamic load as well as varying irradiance conditions.