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.

scholarly journals Reduction of single DC bus capacitance in photovoltaic cascaded multilevel converter

2020 ◽  
Vol 11 (3) ◽  
pp. 1660
Author(s):  
Turki Kahawish Hassan
Keyword(s):  
Control System ◽  
Harmonic Distortion ◽  
Voltage Control ◽  
Partial Shading ◽  
Point Tracking ◽  
High Bandwidth ◽  
Dc Voltage Control ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Point

<span lang="EN-US">This paper presented single DC bus single phase seven level cascaded H-bridge (CHB) inverter for multi-panel photovoltaic grid-connected applications. A single DC bus supplying flyback converters to produce DC link voltages for CHB cells is suggested. A balanced operation of CHB inverter cells is obtained irrespective to power unbalance occurred by individual maximum power point tracking boost converter of photovoltaic (PV) panels due to the non-uniform irradiation and partial shading. A DC bus voltage control system with addition of estimated DC bus ripple voltage to the reference is proposed to eliminate the second order harmonic contained in the feedback voltage of DC bus enabling to design high bandwidth of DC voltage control loop. This produces fast dynamic response, low total harmonic distortion (THD) of grid current and smaller DC bus capacitance. Mathematical modeling of bus voltage control system is presented. PSIM simulation program is used and the simulation results are obtained to validate the proposed control system.</span>

MPPT of Wind Generation for DC Microgrid

2013 ◽  
Vol 448-453 ◽  
pp. 1802-1805 ◽  
Author(s):  
Yuan Sheng Xiong ◽  
Su Xiang Qian ◽  
Qing Song Liu ◽  
Yan Zhan
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
Maximum Output Power ◽  
Boost Converter ◽  
Wind Generation ◽  
Maximum Output ◽  
Output Current ◽  
Dc Microgrid ◽  
Dc Bus ◽  
Bus Voltage

In order to maintain the maximum output power of the WGS (Wind generation system) for all wind speed conditions, a boost converter is used as the power interface between the WGS and DC microgrid. Traditional method is to directly measure the real-time output voltage and current of WGS by sensors. Considering the DC bus voltage is actually stable, the output voltage can be computed by the duty cycle of boost converter and the stable DC bus voltage. A MPPT method is proposed, which only measures the output current of WGS. The output scale power can be obtained by the output current and the duty cycle, and then the perturbation and observation method is executed. A number of voltage sensors and associated circuitry are cancelled. It reduces the interference and system cost and improves the system reliability. Simulation results with PSIM prove the validity of the proposed method.

Enhanced Zeta Converter for DC Bus Voltage Regulation

2017 ◽  
Vol 8 (4) ◽  
pp. 1503
Author(s):  
P. Suresh ◽  
D. Kirubakaran
Keyword(s):  
Voltage Regulation ◽  
Maximum Power ◽  
Photovoltaic System ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
High Voltage Gain ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Point

In this paper, an Enhanced Zeta Converter (EZC) along with a high voltage gain converter is presented for DC Bus voltage regulation. The enhanced zeta converter consists of capacitors connected in parallel with the conventional zeta structure. The proposed zeta converter is applied to the Photo Voltaic system (PV) The well known Maximum Power Point Tracking (MPPT)     P &amp; O algorithm is used to extract maximum power from the photovoltaic system. The increased voltage is obtained with reduced number of switches using the proposed structure. The results to the proposed structure are compared with the conventional topology. The proposed converter is simulated using MATLAB and the same is verified with the hardware.

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 Studi Penggunaan DC Nanogrid dengan Sumber Photovoltaic pada Beban Bertegangan dibawah Dua Puluh Empat Volt

2019 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Sriyono Sriyono ◽  
Budiyanto Budiyanto
Keyword(s):  
Maximum Power Point Tracking ◽  
Boost Converter ◽  
Maximum Power ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Dc Bus ◽  
Power Point

Nanogrid  adalah sistem terdistribusi dari suatu energi terbarukan yang digunakan untuk aplikasi rumah tangga berdaya rendah. Dc Nanogrid terdiri dari sistem Photovoltaic surya sebagai sumber energi, Maximum Power Point Tracking, converter, battery dan beban. Dalam penelitian ini menggambarkan konsep umum dan kelayakan praktis dari sistem energi terbuka berbasis dc yang mengusulkan cara alternatif untuk merubah jaringan konvensional dari PLN menjadi  jaringan yang lebih ramah lingkungan, aman, efisien, praktis dan cara mendapatkan energinya gratis karena bersumber dari matahari. Dalam tahap awal konsep nanogrid DC ini peneliti menggunakan beban rumah tangga yang bertegangan di bawah dua puluh empat volt.  Dc Nanogrid ini menggunakan dengan DC bus untuk mentransmisikan teganan dari battery menuju ke beban, dan di sertai dengan konverter dc-dc jenis buck dan boost. Converter ini  berfungsi untuk menyesuaikan kebutuhan tegangan pada masing- basing beban yang di gunakan pada penelitian. beban yang di gunakan pada penelitian adalah handphone, mobil maianan , lampu LED 12 volt dan motor DC 24 volt.

scholarly journals Photovoltaic Maximum Penetration Limits on Medium Voltage Overhead and Underground Cable Distribution Feeders: A Comparative Study

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3843
Author(s):  
Sultan Sh. Alanzi ◽  
Rashad M. Kamel
Keyword(s):  
Power System ◽  
Power Factor ◽  
Distribution System ◽  
Power Flow ◽  
Underground Cables ◽  
Overhead Lines ◽  
Medium Voltage ◽  
Load Power ◽  
Bus Voltage ◽  
Pv Penetration

This paper investigates the maximum photovoltaic (PV) penetration limits on both overhead lines and underground cables medium voltage radial distribution system. The maximum PV penetration limit is estimated considering both bus voltage limit (1.05 p.u.) and feeder current ampacity (1 p.u.). All factors affect the max PV penetration limit are investigated in detail. Substation voltage, load percentage, load power factor, and power system frequency (50 Hz or 60 Hz) are analyzed. The maximum PV penetration limit associated with overhead lines is usually higher than the value associated with the underground cables for high substation voltage (substation voltage = 1.05 and 1.04 p.u.). The maximum PV penetration limit decreases dramatically with low load percentage for both feeder types but still the overhead lines accept PV plant higher than the underground cables. Conversely, the maximum PV penetration increases with load power factor decreasing and the overhead lines capability for hosting PV plant remains higher than the capability of the underground cables. This paper proved that the capability of the 60-Hz power system for hosting the PV plant is higher than the capability of 50 Hz power system. MATLAB software has been employed to obtain all results in this paper. The Newton-Raphson iterative method was the used method to solve the power flow of the investigated systems.

Application of Tabu Search for Optimal Placement and Sizing of Distributed Generation for Loss Reduction

2012 ◽  
Vol 433-440 ◽  
pp. 7190-7194 ◽  
Author(s):  
Nattachote Rugthaicharoencheep ◽  
Thong Lantharthong ◽  
Awiruth Ratreepruk ◽  
Jenwit Ratchatha
Keyword(s):  
Tabu Search ◽  
Distributed Generation ◽  
Distribution System ◽  
Power Loss ◽  
Power Flow ◽  
Search Algorithm ◽  
Optimal Placement ◽  
Loss Reduction ◽  
Placement Problem ◽  
Bus Voltage

This paper presents the optimal and sizing of distributed generation (DG) placement in a radial distribution system for loss reduction. The main emphasis of this paper is to identify proper locations for installing DGs in a distribution system to reduce active power loss and improve bus voltages. Nevertheless, proper placement and sizing of DG units are not straightforward to be identified as a number of their positions and capacities need to be determined. It is therefore proposed in this paper to solve a DG placement problem based on a Tabu search algorithm. The objective function of the problem is to minimize the system loss subject to power flow constraints, bus voltage limits, pre specified number of DGs, and their allowable total installed capacity, and only one distributed generator for one installation position. The effectiveness of the methodology is demonstrated by a practical sized distribution system consisting of 69 bus and 48 load points. The results show that the optimal DG placement and sizing can be identified to give the minimum power loss while respecting all the constraints.

scholarly journals Battery Charging Application with Thermoelectric Generators as Energy Harvesters

2019 ◽  
Vol 3 (1) ◽  
pp. 248
Author(s):  
Zakariya M. Dalala ◽  
Zaid S. Hamdan ◽  
Hussein Al-Taani ◽  
Mohammad Al-Addous ◽  
Aiman Albatayneh
Keyword(s):  
Control Algorithm ◽  
Thermoelectric Generator ◽  
Boost Converter ◽  
Constant Current ◽  
Battery Charger ◽  
Power Matching ◽  
Point Tracking ◽  
Battery Chargers ◽  
Charging Current ◽  
Power Point

This paper discusses and presents the implementation of a boost converter as power electronic interface to be used with the thermoelectric generator (TEG). The common application for such system is the battery charger. The boundary conditions for battery chargers include the charging current and battery voltage limits which have to be respected throughout the charging process, while the maximization of the power generated from the TEG is a global target that is desired to be met as much as possible. Coordinated control algorithm that collectively combines these constraints is the main focus of this work. Novel global control algorithm is proposed and verified in this paper with detailed analysis that shows the effectiveness of the proposed algorithm. Dual control loops for the voltage and current of the boost converter will be designed and analyzed to satisfy the source and load demands. Maximum power point tracking (MPPT) mode, power matching mode and voltage stabilization mode will be integrated in the control algorithm of the battery charger. This paper puts a schematic design for a system that harvests energy from a thermoelectric generator bank of a TEG1-12611-6.0 TEG modules in order to charge a battery bank of Samsung ICR18650 Batteries using constant current (CC) and constant voltage (CV) charging profiles.

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