This thesis proposes advanced control strategies for photovoltaic and energy storage power conversion systems to improve energy harvesting, ensure grid compliance, and provide grid support. The first improvement extends the input voltage range of inverters to increase solar energy capture. A voltage-reactive power control strategy and modified modulation technique provide a lower voltage limit. Maximizing semiconductor utilization achieves a higher limit, improving energy capture by 30%. A second strategy integrates grid fault detection within control algorithms to enable compliance. The final contribution provides frequency and voltage support functions for grid stability beyond existing standards. Combined, these methods create a high-performance, safe, and grid-friendly solar power system.
The document provides information about an annual conference held in Rhodes, Greece from June 15-19, 2008. The conference was the 39th Annual Power Electronics Specialists Conference hosted at the Capsis Hotel and Convention Center in Rhodes, Greece. The proceedings from the conference can be found online at the provided website.
This document discusses uncertainties in long-term photovoltaic (PV) yield predictions. It identifies many sources of uncertainty that PV developers face, such as variable weather, equipment availability and quality, and changing government policies. It also examines uncertainties in estimating solar radiation levels and modeling the PV system's performance over its lifetime. The document presents the results of statistical simulations to quantify the effects of these uncertainties and determine the overall uncertainty in PV yield predictions for the first year and over the lifetime of a system. It concludes that uncertainties can be significant and provides recommendations for improving prediction accuracy.
This document summarizes a research paper that proposes a control strategy for a three-phase grid-connected photovoltaic system using instantaneous reactive power theory (p-q theory). The system uses maximum power point tracking to extract maximum power from the photovoltaic array. The control strategy aims to supply both active and reactive power to the grid from the PV inverter. When sunlight is available, the system supplies active power to the grid while compensating for reactive power loads. When there is no sunlight, the inverter only supplies reactive power to compensate loads. The p-q theory allows for control of both active and reactive power without using a phase-locked loop, simplifying the system implementation and calculations.
This document discusses performance parameters for evaluating grid-connected photovoltaic (PV) systems. It introduces four key parameters: final PV system yield (Yf), reference yield (Yr), performance ratio (PR), and PVUSA rating. Yf measures energy output normalized to system size. Yr quantifies solar resource. PR evaluates overall system losses by normalizing energy output to solar resource. PVUSA rating estimates system AC power output. The document also discusses methodologies for determining system AC power ratings during design using empirically derived derating factors from measured performance parameters. Comparing estimated to measured performance helps improve rating accuracy.
This document discusses solar cells, modules, and arrays. It describes how solar cells convert sunlight to electricity via the photovoltaic effect. Silicon solar cells produce around 0.5-0.6 volts and their current output depends on area, efficiency, and irradiance. Modules are made by connecting cells in series and parallel and include glass, polymer backsheets, and frames. Arrays are built from modules and can be ground mounted, roof mounted, or building integrated. The document also examines I-V characteristics, efficiency, fill factor, and the effect of temperature and load on performance.
This document summarizes a research paper that presents a control model for a three-phase grid-connected photovoltaic generation system with reactive power regulation. It proposes a control scheme using two PI controllers along with an MPPT algorithm to stabilize the DC voltage. A three-phase grid inverter is synchronized to the grid using a phase-locked loop. Simulation results in Matlab/Simulink show the system has high stability and efficiency with flexible power factor control between 0.5-1. The control structure, MPPT method, DC link control, reactive power control and PLL are described.
2 119-1480671105-4. tjprcijsps - decoupled active and reactive power control fordungsp4
This document describes a decoupled active and reactive power control system for a large-scale grid-connected photovoltaic (PV) system. It uses cascaded current-fed dual active bridge (CF-DAB) converters and a cascaded multilevel inverter. The CF-DAB converters boost the PV panel voltages, achieve maximum power point tracking independently for each PV module, and minimize low-frequency power fluctuations. The cascaded multilevel inverter allows reactive power control in each module to reduce overmodulation risk regardless of active power changes. A control system with phase locked loop, voltage and current controllers, and voltage distribution is proposed to achieve decoupled active and reactive power control and improve power quality and reliability
This thesis proposes advanced control strategies for photovoltaic and energy storage power conversion systems to improve energy harvesting, ensure grid compliance, and provide grid support. The first improvement extends the input voltage range of inverters to increase solar energy capture. A voltage-reactive power control strategy and modified modulation technique provide a lower voltage limit. Maximizing semiconductor utilization achieves a higher limit, improving energy capture by 30%. A second strategy integrates grid fault detection within control algorithms to enable compliance. The final contribution provides frequency and voltage support functions for grid stability beyond existing standards. Combined, these methods create a high-performance, safe, and grid-friendly solar power system.
The document provides information about an annual conference held in Rhodes, Greece from June 15-19, 2008. The conference was the 39th Annual Power Electronics Specialists Conference hosted at the Capsis Hotel and Convention Center in Rhodes, Greece. The proceedings from the conference can be found online at the provided website.
This document discusses uncertainties in long-term photovoltaic (PV) yield predictions. It identifies many sources of uncertainty that PV developers face, such as variable weather, equipment availability and quality, and changing government policies. It also examines uncertainties in estimating solar radiation levels and modeling the PV system's performance over its lifetime. The document presents the results of statistical simulations to quantify the effects of these uncertainties and determine the overall uncertainty in PV yield predictions for the first year and over the lifetime of a system. It concludes that uncertainties can be significant and provides recommendations for improving prediction accuracy.
This document summarizes a research paper that proposes a control strategy for a three-phase grid-connected photovoltaic system using instantaneous reactive power theory (p-q theory). The system uses maximum power point tracking to extract maximum power from the photovoltaic array. The control strategy aims to supply both active and reactive power to the grid from the PV inverter. When sunlight is available, the system supplies active power to the grid while compensating for reactive power loads. When there is no sunlight, the inverter only supplies reactive power to compensate loads. The p-q theory allows for control of both active and reactive power without using a phase-locked loop, simplifying the system implementation and calculations.
This document discusses performance parameters for evaluating grid-connected photovoltaic (PV) systems. It introduces four key parameters: final PV system yield (Yf), reference yield (Yr), performance ratio (PR), and PVUSA rating. Yf measures energy output normalized to system size. Yr quantifies solar resource. PR evaluates overall system losses by normalizing energy output to solar resource. PVUSA rating estimates system AC power output. The document also discusses methodologies for determining system AC power ratings during design using empirically derived derating factors from measured performance parameters. Comparing estimated to measured performance helps improve rating accuracy.
This document discusses solar cells, modules, and arrays. It describes how solar cells convert sunlight to electricity via the photovoltaic effect. Silicon solar cells produce around 0.5-0.6 volts and their current output depends on area, efficiency, and irradiance. Modules are made by connecting cells in series and parallel and include glass, polymer backsheets, and frames. Arrays are built from modules and can be ground mounted, roof mounted, or building integrated. The document also examines I-V characteristics, efficiency, fill factor, and the effect of temperature and load on performance.
This document summarizes a research paper that presents a control model for a three-phase grid-connected photovoltaic generation system with reactive power regulation. It proposes a control scheme using two PI controllers along with an MPPT algorithm to stabilize the DC voltage. A three-phase grid inverter is synchronized to the grid using a phase-locked loop. Simulation results in Matlab/Simulink show the system has high stability and efficiency with flexible power factor control between 0.5-1. The control structure, MPPT method, DC link control, reactive power control and PLL are described.
2 119-1480671105-4. tjprcijsps - decoupled active and reactive power control fordungsp4
This document describes a decoupled active and reactive power control system for a large-scale grid-connected photovoltaic (PV) system. It uses cascaded current-fed dual active bridge (CF-DAB) converters and a cascaded multilevel inverter. The CF-DAB converters boost the PV panel voltages, achieve maximum power point tracking independently for each PV module, and minimize low-frequency power fluctuations. The cascaded multilevel inverter allows reactive power control in each module to reduce overmodulation risk regardless of active power changes. A control system with phase locked loop, voltage and current controllers, and voltage distribution is proposed to achieve decoupled active and reactive power control and improve power quality and reliability
This document summarizes the simulation parameters and results for a 1 kW grid-connected solar PV system in Vietnam with the following key details:
- The system has 4 panels tilted at 13 degrees facing north producing a total of 1060 Wp
- Over the first year of operation the system is estimated to produce 1542 kWh of electricity with a performance ratio of 77.31%
- A loss analysis shows the various losses that reduce the estimated production including losses from temperature, wiring, soiling, and more that total 21.7%
- An evaluation of production probabilities estimates a P50 of 1542 kWh, P90 of 1472 kWh, and P95 of 1453 kWh taking into account
This document discusses solar cells, modules, and arrays. It describes how solar cells convert sunlight to electricity via the photovoltaic effect. Silicon solar cells produce around 0.5-0.6 volts and their current output depends on area, efficiency, and irradiance. Modules are made by connecting cells in series and parallel and include glass, polymer backsheets, and frames. Arrays are built from modules and can be ground mounted, roof mounted, or building integrated. The document also examines I-V characteristics, efficiency, fill factor, and the effect of temperature and load on performance.
This thesis proposes advanced control strategies for photovoltaic and energy storage power conversion systems to improve energy harvesting, ensure grid compliance, and provide grid support. The first improvement extends the input voltage range of inverters to increase solar energy capture. A voltage-reactive power control strategy and modified modulation technique provide a lower voltage limit. Maximizing semiconductor utilization achieves a higher limit, improving energy capture by 30%. A second strategy integrates grid fault detection within control algorithms to enable compliance. The final contribution provides frequency and voltage support functions for grid stability beyond existing standards. Combined, these approaches develop high-performance, efficient, safe and grid-friendly solar power solutions.
This document summarizes the simulation parameters and results for a 1 kW grid-connected solar PV system in Vietnam with the following key details:
- The system has 4 panels tilted at 13 degrees facing north producing a total of 1060 Wp
- Over the first year of operation the system is estimated to produce 1542 kWh of electricity with a performance ratio of 77.31%
- A loss analysis shows the various losses that reduce the estimated production including losses from temperature, wiring, soiling, and more that total 21.7%
- An evaluation of production probabilities estimates a P50 of 1542 kWh, P90 of 1472 kWh, and P95 of 1453 kWh taking into account
This document discusses solar cells, modules, and arrays. It describes how solar cells convert sunlight to electricity via the photovoltaic effect. Silicon solar cells produce around 0.5-0.6 volts and their current output depends on area, efficiency, and irradiance. Modules are made by connecting cells in series and parallel and include glass, polymer backsheets, and frames. Arrays are built from modules and can be ground mounted, roof mounted, or building integrated. The document also examines I-V characteristics, efficiency, fill factor, and the effect of temperature and load on performance.
This thesis proposes advanced control strategies for photovoltaic and energy storage power conversion systems to improve energy harvesting, ensure grid compliance, and provide grid support. The first improvement extends the input voltage range of inverters to increase solar energy capture. A voltage-reactive power control strategy and modified modulation technique provide a lower voltage limit. Maximizing semiconductor utilization achieves a higher limit, improving energy capture by 30%. A second strategy integrates grid fault detection within control algorithms to enable compliance. The final contribution provides frequency and voltage support functions for grid stability beyond existing standards. Combined, these approaches develop high-performance, efficient, safe and grid-friendly solar power solutions.
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CÔNG TY TNHH KỸ THUẬT ĐẠT
Địa chỉ : B163, Khu phố 3, Nguyễn Văn Quá, P.Đông Hưng Thuận, Q.12,
TP.HCM
Điện thoại: (84) - 08 3715 7567 - Fax: (84) - 08 3891 6586
Email: dattechco@gmail.com ; dat@dattech.com.vn
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CÔNG TY TNHH KỸ THUẬT ĐẠT
Địa chỉ : B163, Khu phố 3, Nguyễn Văn Quá, P.Đông Hưng Thuận, Q.12,
TP.HCM
Điện thoại: (84) - 08 3715 7567 - Fax: (84) - 08 3891 6586
Email: dattechco@gmail.com ; dat@dattech.com.vn
2.
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