Abstract:Summary
In this paper, a linearized equivalent electrical circuit of a photovoltaic generator is developed. The proposed model is based on nonlinear and well‐tested current‐voltage equations which are however used in an alternative mathematical manner. The application of a linearization process, which differs from the well‐known piecewise linear scheme and is based on Taylor's series approximation, leads to uncoupling of the current and voltage quantities in each time step of a digital simulation. Using the pr… Show more
“…Many studies on PV MPPT and DC voltage control currently exist . This paper mainly discusses the power control strategy under unbalanced grid faults.…”
Section: Power Control Of Photovoltaic Inverter Under Unbalanced Gridmentioning
“…Many studies on PV MPPT and DC voltage control currently exist . This paper mainly discusses the power control strategy under unbalanced grid faults.…”
Section: Power Control Of Photovoltaic Inverter Under Unbalanced Gridmentioning
“…In Gazoli et al, comprehensive approach of modeling and simulation of PV arrays is presented that proposed a method to determine the parameters of a single‐diode model from panel. A linear equivalent electrical circuit of PV module has been proposed in Theocharis and Pyrgioti for implementing on EMTP platform. Pandiarajan et al have developed power electronic circuit oriented model of PV module, and its results are experimentally validated.…”
Summary
The solar power plants are playing a significant role in energy market due to its eco‐friendly nature, low operational, and maintenance cost. The efficiency of these plants depends mainly on load impedance, topology of converters, and maximum power point tracking algorithms. In this work, effect of operating point (load line selection) on the performance of maximum power point tracking for different DC‐DC converter topologies has been studied and experimentally validated. Further, the operating constraints of buck, boost, and buck‐boost modes of converter operation in terms of load impedance are presented. The performance of different maximum power point tracking algorithms under load and solar irradiance change has been investigated for all converter topologies discussed. The modified model of photovoltaic module has been presented for simulation study under different solar irradiance and load variations that can be easily implemented on Real Time Digital Simulator platform unlike conventional models.
“…In recent years, power quality issues of active distribution systems with PVGs are gaining much interest . The interface inverter of the PVG has been used with different control options to supply active and reactive powers to the utility.…”
Section: Introductionmentioning
confidence: 99%
“…This model could be extended to form a small distribution system with few buses to test the impacts of the PV penetration levels on residential distribution systems. Other works are directed to develop linearized models of the PVG so that they can be easily implemented in a third‐party application such as EMTP program . In another study, the harmonic impact of high PV penetration levels has been reduced using a current‐controlled voltage source and current‐controlled current source .…”
Section: Introductionmentioning
confidence: 99%
“…In recent years, power quality issues of active distribution systems with PVGs are gaining much interest. [7][8][9][10][11][12] The interface inverter of the PVG has been used with different control options to supply active and reactive powers to the utility. A variety of methodologies is adopted either to simulate the control actions or to promote new control methods.…”
Summary
In this paper, a developed voltage control method for distributed single‐phase photovoltaic (PV) generators in unbalanced distribution networks is proposed. The reactive power capability of the PV inverters has been used to regulate bus voltages during irradiance or load variations. The amount of the reactive power required to optimize phase voltages is calculated using fuzzy logic control function, and hence, the power factor is precisely determined. The proposed control for the PV inverters is based on the dq‐current control to regulate the DC bus voltage and the amount of the reactive power. A hysteresis current control is used as a pulse width modulation gate generator. The proposed control precisely determines the amount of the required reactive power to regulate the system bus voltages to lie within standard limits. The efficiency of the proposed control is evaluated with a 10‐node, 5 kV/phase unbalanced three phase distribution system. The analysis includes different test cases under transient and steady state operations to ensure accurate representation of the actual system. The obtained results assess the quality of the network voltages of the studied system regarding voltage levels and the degree of the unbalance. Moreover, the proposed control is capable of operation under different power factors of the PV inverter.
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