The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<<ETX>>

Multi-level conversion : high voltage choppers and voltage-source inverters

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Power Electronics Converters Applications And Design

Due to the possibility of providing energy with much less dependence on the fossil fuels, renew-competent energy sources, in specified sun photovoltaic (PV) conversion have received elevated acceptance and progress in latest times. Big benefits of PV panels comprise easy and trustworthy power production and suitability for disbursed iteration. In addition the costs for photovoltaic modules is drastically lowering. To comprehend this issue, a control plan with modulation compensation scheme is likewise proposed. An exploratory three-stage seven-level cascaded H-bridge inverter has been manufactured using nine H-bridge modules (three modules for each stage). Each H-bridge module is associated with a 185-W solar panel. Simulation results are introduced to confirm the practicality of the proposed approach.

Modular Cascaded H-Bridge Multilevel PV Inverter with Distributed MPPT for Grid-Connected Applications

Rapid industrialization and its automation on the globe demands increased generation of electrical energy with more reliability and quality. Renewable energy (RE) sources are considered as a green form of energy and extensively used as an alternative source of energy for conventional energy sources to meet the increased demand for electrical power. However, these sources, when integrated to the utility grid, pose challenges in maintaining the power quality (PQ) and stability of the power system network. This is due to the unpredictable and variable nature of generation by these sources. The distributed flexible AC transmission system (DFACTS) devices such as distributed static compensator (DSTATCOM) and dynamic voltage restorer (DVR) play an active role in mitigating PQ issues associated with RE penetration. The performance of DFACTS devices is mostly dependent on the type of control algorithms employed for switching of these devices. This paper presents a comprehensive review of various conventional and adaptive algorithms used to control DFACTS devices for improvement of power quality in utility grids with RE penetration. This review intends to provide a summary of the design, experimental hardware, performance and feasibility aspects of these algorithms reported in the literature. More than 170 research publications are critically reviewed, classified, and listed for quick reference for the advantage of engineers and academician working in this area.

/pdf/comprehensive-review-of-distributed-facts-control-algorithms-3abt9977a4.pdf

Comprehensive Review of Distributed FACTS Control Algorithms for Power Quality Enhancement in Utility Grid With Renewable Energy Penetration

This paper deals with a comprehensive study of configurations of microgrid (MG) based on variable speed generators. The selection criteria for these configurations along with the design of required control algorithms, are presented in detail. Simulation results and experimental validation of selected MG configurations are given to demonstrate their suitability. It is aimed to enhance applications of MGs with main emphasis on renewable energy sources to ensure sustainable development in rural and remote areas.

Microgrid: Configurations, Control and Applications

This paper presents a control of smart photovoltaic (PV)-distribution static compensator (DSTATCOM) grid tied system using an adaptive reweighted zero attracting control algorithm with perturb and observe maximum power point tracking technique for a three phase system to improve power quality and support the three phase ac grid by supplying power both to the grid and the connected loads. The proposed PV grid tied system is capable of working round the clock. During sunshine conditions, the proposed system performs dual functions of improving power quality by working as DSTATCOM and also transfers power to the load and the grid obtained from PV array. However, during night or cloudy conditions, the proposed system works as DSTATCOM improving power quality and the power is transferred from the grid to the load. The system is termed as a smart as it is able to perform both modes automatically sensing the PV power and is capable of multidirectional power flow. The experimental validation is carried out on a developed prototype in the laboratory under varying modes.

Control of Grid Tied Smart PV-DSTATCOM System Using an Adaptive Technique

Grid integration of single stage SPV-STATCOM using cascaded 7-level VSC

This paper presents a single stage solar photovoltaic (SPV) grid integrated power generating system using a three-phase seven level asymmetric cascaded H-bridge voltage source converter (VSC) operating at low switching frequency using level shift PWM (Pulse Width Modulation) technique. The use of asymmetric cascaded H-bridge topology presents the benefit of high number of voltage levels with less number of switching devices in comparison to symmetric cascaded H-bridge topology and offers the advantage of low switching losses, reduced total harmonic distortion (THD), ease of operation at high voltages and high power which results in enhancement of power quality in the proposed system. Simulated results in MATLAB validate the design and control algorithm under steady state and dynamic conditions at varying solar insolations.

Grid integration of single stage SPV system using asymmetric cascaded 7-level VSC

This paper presents a solar grid integrated power generating system using a three level voltage source converter (VSC) operating at low switching frequency with double synchronous rotating frame phase locked loop (DSRF-PLL) based control algorithm. An incremental conductance algorithm is used to track maximum power from solar PV (Photovoltaic) array which is fed to the grid. The use of three level VSC offers the advantage of low switching losses and operation at high voltages and powers. It also results in lower total harmonic distortion (THD) of grid currents. Simulated results validate the design and control algorithm under steady state and dynamic conditions.

http://ieeexplore.ieee.org/iel7/7438527/7443105/07443738.pdf

Grid integration of solar PV generating system using three-level voltage source converter

Abstract This paper presents a single stage solar PV (photovoltaic) grid integrated power generating system using a three level voltage source converter (VSC) operating at low switching frequency of 900 Hz with robust synchronizing phase locked loop (RS-PLL) based control algorithm. To track the maximum power from solar PV array, an incremental conductance algorithm is used and this maximum power is fed to the grid via three-level VSC. The use of single stage system with three level VSC offers the advantage of low switching losses and the operation at high voltages and high power which results in enhancement of power quality in the proposed system. Simulated results validate the design and control algorithm under steady state and dynamic conditions.

Maulik Kandpal

Papers

Control of Grid Tied Smart PV-DSTATCOM System Using an Adaptive Technique

Grid integration of single stage SPV-STATCOM using cascaded 7-level VSC

Grid integration of single stage SPV system using asymmetric cascaded 7-level VSC

Grid integration of solar PV generating system using three-level voltage source converter

Grid Integration of Single Stage Solar PV System using Three-level Voltage Source Converter