scholarly journals Power Quality in Distribution Grids

2019 ◽  
Vol 9 (1) ◽  
pp. 2964-2967 ◽  
Keyword(s):  
Power Quality ◽  
Low Voltage ◽  
Control Procedure ◽  
Minimum Power ◽  
Point Tracking ◽  
Voltage Controller ◽  
Facts Controllers ◽  
Bus Voltage ◽  
Tracking Point ◽  
Power Point

Voltage constrained DSTATCOM-based voltage controller is executed for low voltage appropriation system. To meet grid code, unexpected investment postponing, voltage regulator is designed while a complete arrangement could be wanted to tackle guideline issues. 3 yield voltage closed paths with dynamic damping and 2 bus voltage closed paths are associated with control procedure. Also, two circles are incorporated to the control architecture proposed: the idea of Tracking the Minimum Power Point then recurrence closed path. Results demonstrate the guideline limit, the calculation of tracking point of minimum power direct recurrence steadiness. Record Terms— Power Quality, FACTS Controllers, power point tracking, compensation of frequency, DSTATCOM

scholarly journals Control Strategy of Intergrated Photovoltaic-UPQC System for DC-Bus Voltage Stability and Voltage Sags Compensation

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 4009
Author(s):  
Dongsheng Yang ◽  
Zhanchao Ma ◽  
Xiaoting Gao ◽  
Zhuang Ma ◽  
Enchang Cui
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Control Method ◽  
Integrated System ◽  
Normal Operation ◽  
Photovoltaic Array ◽  
Point Tracking ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Point

Power quality problem, because of its various forms and occurrence frequency, has become one of the most critical challenges confronted by a power system. Meanwhile, the development of renewable energy has led to more demands for an integrated system that combines both merits of sustainable energy generation and power quality improvement. In this context, this paper discusses an integrated photovoltaic-unified power quality conditioner (PV-UPQC) and its control strategy. The system is composed of a series compensator, shunt compensator, dc-bus, and photovoltaic array, which conducts an integration of photovoltaic generation and power quality mitigation. The fuzzy adaptive PI controller and the improved Maximum Power Point Tracking (MPPT) technique are proposed to enhance the stability of dc-bus voltage, which is aimed at the power balance and steady operation of the whole system. Additionally, the coordinate control strategy is studied in order to ensure the normal operation and compensation performance of the system under severe voltage sag condition. In comparison to the existing PV-UPQC system, the proposed control method could improve the performance of dc-bus stability and the compensation ability. The dynamic behavior of the integrated system were verified by simulation in MATLAB and PLECS. Selected results are reported to show that the dc-bus voltage was stable and increased under severe situations, which validates the effectiveness of the proposed integrated PV-UPQC system and its control strategy.

scholarly journals Dual-Mode Photovoltaic Bidirectional Inverter Operation for Seamless Power Transfer to DC and AC Loads with the Grid Interface

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
M. Srikanth ◽  
B. Pakkiraiah ◽  
Poonam Upadhyay ◽  
S. Tara Kalyani
Keyword(s):  
Distribution System ◽  
Output Voltage ◽  
Power Flow ◽  
Boost Converter ◽  
Power Transfer ◽  
Dual Mode ◽  
Point Tracking ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Point

This paper develops the photovoltaic bidirectional inverter (BI) operated in dual mode for the seamless power transfer to DC and AC loads. Normal photovoltaic (PV) output voltage is fed to boost converter, but in space application, boost converter is not so preferable. To overcome this, buck and boost converters are proposed in this paper. Duty cycle to this converter is provided with the help of the outcome of the maximum power point tracking (MPPT) controller. This can be implemented by using perturbation and observation method. The MPPT will operate the switch between buck and boost modes. When the output voltage of a PV array is close to the dc bus voltage, then the bidirectional inverter can fulfill both rectification and grid connected mode. To control the power flow between dc bus and ac grid, a dc distribution system is used to regulate the dc bus voltage to a convinced level. Moreover, the bidirectional inverter must fulfill grid connection (sell power) and rectification (buy power) with power factor correction (PFC) to control the power flow between dc bus and ac grid. The simulations and hardware experimental results of a 2.5 kVA circuit are presented to validate the performance of the proposed dual-mode seamless power transfer.

Modeling and Simulation of Oscillating Water Column Wave Energy Generator

2012 ◽  
Vol 610-613 ◽  
pp. 2525-2529
Author(s):  
Hong Zhan Nie ◽  
Ming Zhang ◽  
Hong Shen
Keyword(s):  
Mathematical Model ◽  
Water Column ◽  
Wave Energy ◽  
Low Voltage ◽  
Simulation Analysis ◽  
Oscillating Water Column ◽  
Synchronous Generators ◽  
Permanent Magnet Synchronous Generators ◽  
Point Tracking ◽  
Power Point

This paper focuses on the oscillating water column (OWC) wave energy generator. An overall mathematical model is established comprising of the wave energy capture, drive system, permanent magnet synchronous generators (PMSG), vector control, maximum power point tracking (MPPT), and low voltage ride through (LVRT) control. With this mathematical model, an OWC wave energy generator based on PMSG simulation model is set up in Matlab/Simulink environment. A simulation analysis of the model is carried out which is connected to the grid under the condition of wave changes and power system faults. The simulation facilitates the MPPT and the decoupling control of power for OWC wave energy generator. Results show that the system with back-to- back PWM converter operates in a satisfying way and the model established works correctly and effectively.

scholarly journals Photovoltaic MPPT Algorithm Based on Hybrid Boost Converter and Variable Step Size Incremental Conductance

2021 ◽  
Vol 299 ◽  
pp. 01013
Author(s):  
Yiwei Ma ◽  
Fuxing Wang ◽  
Zongsheng Huang ◽  
Qin Feng ◽  
Changhao Piao
Keyword(s):  
Low Voltage ◽  
Boost Converter ◽  
Photovoltaic System ◽  
Variable Step Size ◽  
Tracking Accuracy ◽  
Step Size ◽  
Point Tracking ◽  
Incremental Conductance ◽  
Variable Step ◽  
Power Point

Aiming at the problem of low voltage gain of traditional boost converter and the incompatibility of tracking speed and tracking accuracy with the traditional incremental conductance algorithm (INC), this paper uses the hybrid boost converter as the DC/DC converter of photovoltaic system, and designs the variable step size INC algorithm control strategy to achieve Maximum power point tracking (MPPT) of photovoltaic. Simulink simulation model verifies the feasibility of the proposed algorithm, which effectively improves the output voltage and power generation efficiency of the photovoltaic system.

scholarly journals Design and development of three stages maximum power tracking solar charge controller

2020 ◽  
Vol 18 (3) ◽  
pp. 1270
Author(s):  
N.H. Abdul Rahman ◽  
A. M. Omar ◽  
E. H. Mat Saat ◽  
N. I. Ilham ◽  
M. Z. Hussin ◽  
...  
Keyword(s):  
Low Voltage ◽  
Buck Converter ◽  
Maximum Power ◽  
Battery Charging ◽  
Set Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Bulk Absorption ◽  
Three Stages ◽  
Power Point

<span>This paper presents the design of a Three Stages Maximum Power Point Tracking (MPPT) charge controller for improving the charging/discharging control of the battery. In this research, Buck Converter is used to regulate the voltage from the Photovoltaic (PV) module to the required voltage. This research is limited to Valve Regulated Lead Acid (VRLA) battery for 12V system voltage. The charge control algorithm envisages controlling the charging and discharging action in all the three stages of battery charging, bulk, absorption, and float. The idea is to control the battery charging and discharging status until meeting the battery set-point. The set-point is limited to High Voltage Disconnect (HVD), Low Voltage Disconnect (LVD) and Load Voltage Reconnect (LVR) to protect the battery from over-charging and deep-discharging. The results obtained demonstrate the good performance of the charge controller. With the application of the MPPT algorithm in the bulk stage, the time taken to get the battery to fully charged state becomes faster The regulation power from the converter to the inverter has performed well and the switching relay is managed to be controlled.</span>

scholarly journals Multi level Transformer less PV Inverter with Reduced Switching Losses and Elimination of CM leakage Current

2020 ◽  
Vol 9 (11) ◽  
pp. 223-228
Keyword(s):  
Leakage Current ◽  
Low Voltage ◽  
Stable Operation ◽  
Efficient Operation ◽  
Low Voltage Ride Through ◽  
Point Tracking ◽  
Pv Inverter ◽  
Switching Losses ◽  
Power Point Tracking ◽  
Power Point

In order to have efficient operation of grid connected Photovoltaic (PV) inverter, the issue of leakage current must be completely eliminated. For this new transformerless multilevel inverter is proposed in this paper with (k-1) levels in which k denotes the number of switches. The inverter provides zero common mode leakage current and also capable of operating under half of rated PV voltage, hence make this proposed inverter topology as LVRT (low voltage ride through) capable. Different modes are employed for the stable operation of the proposed inverter with varying input PV voltage. Simulation work is carried out for three, five and seven level proposed inverter topologies in MATLAB/Simulink software which determines its maximum power point tracking performance. Here the THD (Total Harmonic Distortions) of 3, 5 and 7 levels are compared.

Sign in / Sign up

Export Citation Format

Share Document