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In distribution network, with the installed of photovoltaic (PV), bought many problems. One of the most concerned problems is the overvoltage in the terminal bus of distribution network. It is caused by the reverse power flow which brought out by the increase of the PV sources penetration. In this paper, an improved PQ-Q (V) control strategy is proposed to alleviate such problem. The economic performance...
Photovoltaic energy (PV) is one of the cleanest forms of renewable energy. The popularity of this technology has been widely recognized with the incentives provided by the governments of various countries across the globe. Day by day, the growth rate of PV is steadily increasing. Renewable energy resources like PV are interfaced with power electronic inverters to enable its interconnection to the...
Multilevel cascade H-bridge (CHB) converters are increasingly applied for large-scale grid-connected photovoltaic power plants (GCPVPPs) because of their improved quality of output voltage waveforms, high efficiency due to the elimination of the line frequency transformer and modular structure. On the other hand, due to the high penetration of the installed distributed generation units in the power...
Distributed generation systems interconnected to a power system are required so as to recover their output power immediately after the voltage sag caused by a fault in the power system. The purpose of this work is to develop a control strategy of for a photovoltaic inverter so as to maintain the output current during the voltage sag and recover the output power rapidly after the voltage sag. The proposed...
With a number of large centralized photovoltaic power plants connected to the grid. Junction photovoltaic power plants and power generation systems and power grid, which is the point of common coupling. Often due to the unstable output of photovoltaic power plants caused by abnormal voltage and outlets. So, PCC point becomes the measure of a grid system is stable and reliable vital sign. Generally,...
In this paper, a new coordination photovoltaic/battery micro-grid control strategy is proposed to improve the micro-grid fault ride-through capability. Under normal condition, the proposed strategy can restrain the influence of load fluctuations. When symmetrical grid fault happens, the micro-grid can ride through it by the proposed strategy. The DC-link bus voltage and AC current could be kept stable...
When alternative power sources are connected to the utility grid the core characteristics of the system are changed. This fact is especially true for intermittent, volatile power sources such as photovoltaic (PV) systems. In recent years, PV power systems have become increasingly cost competitive leading to greater penetrations of both large and small scale PV systems. The large scale integration...
Solar ship, which integrates the solar photovoltaic (PV) system into its own ship power system, is becoming one kinds of most promising and fastest developing green ship. Since the electric energy transformed by PV system is provided to the power load through the ship's distribution system, the output power of synchronous generator will be reduced in proportion. Especially, if the matching relationship...
In recent years the amount of embedded PV generation in distribution networks has increased significantly. Currently, there is no standard approach on how to model the effect of this generation on the network. This paper aims to provide some guidelines on how to model embedded PV generation in distribution networks. A number of approaches are considered the first being a distributed approach to modelling...
Large-scale integration of distributed generations (DGs) may degrade the stability of the power distribution system. This paper proposes a control method to improve the system stability of grid-connected inverter-based distributed generation (DG) systems. The proposed method is to add a stabilizer inside the inverter interface controller of a DG unit to supply auxiliary current reference signal for...
This paper presents a simplified mathematical model of photovoltaic generation system which can be used to perform various power system studies. First the relation between solar radiation and PV output is presented. Then the power electronics inverter control employed in PV system is described. Finally the performance of detail model and simplified model of PV system is compared and commented. The...
The most affected parts of the electrical power system in Germany are the distribution grids due to the rapid expansion of renewable energies. Most of these micro power plants e.g. photovoltaic systems feed into the low (LV) and medium (MV) voltage level. The voltage stability in these levels is thus much more complex and is partially violated in moments of strong feed-in. To reduce this negative...
The protection's setting values set according to 《 Technical rules for photovoltaic power station connected to Power Grid for State Grid Corporation of China》 may bring adverse influence to stable operation of the PV station connected to isolated grid with small capacity. The inverter's protection setting of the PV station connected to isolated gird is studied with PSASP software. The simulation results...
The development of newer technologies in concentrating solar power (CSP) plants, particularly plants using dish Stirling systems, as well as changes in the design of photovoltaic (PV) inverters is creating new challenges in the design of low- and medium-voltage collector systems for large solar power plants. Furthermore, interconnect requirements for reactive power, voltage, and ramp rate control...
Conventional anti-islanding techniques used in grid-tied photovoltaic (PV) systems pose many disadvantages at high levels of PV deployment. One such issue is the inability of these systems to ride-through grid disturbances. In this paper, the use of a Power Line Carrier Communications (PLCC) Permissive anti-islanding scheme is investigated as a means of safely enabling ride-through operation of grid-tied...
A fuzzy sliding-mode robust controller with feed forward compensation is designed for grid-connected photovoltaic system. First, a integral sliding-mode controller is designed by exponential approach law to accelerate the system's starting phase, and for improving the stability of the system, the output of the sliding-mode controller is soften by fuzzy controller to reduce the flicking of the sliding-mode...
In order to improve the efficiency of photovoltaic (PV) systems and to extend the application of PV power generation, a new architecture to connect the solar plant to the grid suitable for large PV plant is proposed discussing benefits and drawbacks respect to the other usually adopted architectures. Furthermore an EMTP-ATP model is developed to analyze the transient and steady state behavior of the...
This work presents the design of a sliding-mode based current controller for a Cascade Full Bridge Multilevel Inverter grid connected PV system. The design also includes a modulation strategy to share the control action among the cascade-connected bridges in order to concurrently synthesize a multilevel waveform and to keep each of the PVG at its maximum operating point. Experimental results are included...
A micro-grid can increase the reliability of energy supplies by disconnecting from the grid in the case of network faults or reduced power quality. The techniques that have been investigated to control micro-grids in both modes are summarized as well as those proposed to maintain stability during the transitions from one mode to the other. This paper first introduces the micro-grid planning structure...
In this paper, we propose a grid-connected photovoltaic power system including batteries in order to provide prescribed reactive and real powers to the grid. According to the stochastic nature of the photovoltaic power, the main feature of the proposed system is to erase power fluctuations by designing a dedicated local control system. With batteries, the whole system is able to smooth the PV power...
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