EPE Association: EPE 2018 - LS4d: Power Electronics for Photovoltaics

EPE 2018 - LS4d: Power Electronics for Photovoltaics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 05: Renewable Energy Power Systems > EPE 2018 - LS4d: Power Electronics for Photovoltaics

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   A Modified SMS Islanding Detection Technique for Reduced Non Detection Zone
By Pankaj KUMAR [View]
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Abstract: Islanding detection plays a crucial role in grid connected distributed generation systems. In literature different types of Islanding detection techniques, categorized as active, passive and hybrid are discussed. Slip mode frequency shift islanding detection method (SMS IDM) is a popular active islanding detection method. Though the technique is able to detect islanding in most of the loading conditions, it has Non -Detection Zone (NDZ) for loads with high quality factor and low real power consumption. This paper proposes an active islanding detection technique which is motivated from SMS IDM, but it uses reactive power output of inverter instead of the phase angle as a function of frequency of the voltage at the Point of Common Coupling(PCC). It has been shown that the proposed technique is independent of the active power consumption of the load and works for all types of loading conditions. Selection of parameters for the proposed technique is also discussed in this paper. Simulations have been carried out in MATLAB/Simulink for different types of loading conditions to validate the proposed technique.

   Comparative Study Between Conventional and Quadratic DC/DC Boost Converters Used In Solar Energy System with New Control Strategy
By Ahmad GHAMRAWI [View]
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Abstract: This paper presents a new control strategy applied to a simple DC/DC boost converter and a quadratic one and a comparison between their performance when controlled by the proposed controller. These converters are usually used in the adaptation stage of solar energy systems. The control signal is a switching rule based on Lyapunov theory coupled to a conventional perturb and observe controller. The resulting controller assures a maximum power extraction from the solar panel. Simulation results are presented to test the robustness of the proposed switching rule and to confirm the advantage of the utilization of the quadratic converter compared to a standard one.

   FAULT ANALYSIS AND FIELD EXPERIENCES OF CENTRAL INVERTER BASED 2 MW PV PLANT
By Boris DUMNIC [View]
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Abstract: Reliability of photovoltaic (PV) components, systems and operation plays significant role in marketability of PV power plants. In that regard special attention should be given to the activities oriented at reliability improvement. Considering the quantity of parameters that could influence the operation of PV system, a number of different fault manifestations can be expected. The paper presents a classification of photovoltaic (PV) power system faults and has a root cause analysis oriented towards reliability improvement and thereby being able to reduce the overall capital and operational cost. The analysis is based on long-term field experience of operation and maintenance (O&M) of a central inverter based 2 MW PV power plant. Practical reliability improvement suggestions are also given.

   Novel DC to Single-Phase Isolated AC Converter using Coupled Inductor with Power Decoupling Capability
By Nagisa TAKAOKA [View]
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Abstract: This paper proposes a novel active power decoupling converter topology, where additional components are not necessary in order to minimize the power decoupling circuit. In conventional EV/PHV battery charger systems with the power decoupling capability require several passive components and switching devices in order to absorb the power ripple at twice grid frequency. Thus, these topologies restrict the downsizing. In order to avoid the additional components for the power decoupling capability, this paper proposes the isolated DC to single-phase AC converter with an employment of a coupled inductor. This converter consists of a full-bridge inverter, a high frequency transformer and an indirect matrix converter in order to eliminate DC-link smoothing capacitors. Moreover, the additional inductor for the power decoupling circuit in the conventional topology can be substituted with leakage inductor of the coupled inductor in the proposed converter. In the proposed circuit, the coupled inductor is an isolation between the DC and the AC equipment for safety and the boost inductance. These characteristics result in a high-power-density converter. The validity of the proposed circuit is experimentally confirmed by a simulation and experiment at prototype. As a simulation result, the proposed method reduces the second-order harmonic of the power ripple by 97.5\% at 3-kW of the output power. As experimental results, the proposed converter reduces the DC current ripple generated by a single-phase AC load by 46.5\%.

EPE 2018 - LS4d: Power Electronics for Photovoltaics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 05: Renewable Energy Power Systems > EPE 2018 - LS4d: Power Electronics for Photovoltaics
	[return to parent folder]

	A Modified SMS Islanding Detection Technique for Reduced Non Detection Zone By Pankaj KUMAR	[View] [Download]
Abstract: Islanding detection plays a crucial role in grid connected distributed generation systems. In literature different types of Islanding detection techniques, categorized as active, passive and hybrid are discussed. Slip mode frequency shift islanding detection method (SMS IDM) is a popular active islanding detection method. Though the technique is able to detect islanding in most of the loading conditions, it has Non -Detection Zone (NDZ) for loads with high quality factor and low real power consumption. This paper proposes an active islanding detection technique which is motivated from SMS IDM, but it uses reactive power output of inverter instead of the phase angle as a function of frequency of the voltage at the Point of Common Coupling(PCC). It has been shown that the proposed technique is independent of the active power consumption of the load and works for all types of loading conditions. Selection of parameters for the proposed technique is also discussed in this paper. Simulations have been carried out in MATLAB/Simulink for different types of loading conditions to validate the proposed technique.

	Comparative Study Between Conventional and Quadratic DC/DC Boost Converters Used In Solar Energy System with New Control Strategy By Ahmad GHAMRAWI	[View] [Download]
Abstract: This paper presents a new control strategy applied to a simple DC/DC boost converter and a quadratic one and a comparison between their performance when controlled by the proposed controller. These converters are usually used in the adaptation stage of solar energy systems. The control signal is a switching rule based on Lyapunov theory coupled to a conventional perturb and observe controller. The resulting controller assures a maximum power extraction from the solar panel. Simulation results are presented to test the robustness of the proposed switching rule and to confirm the advantage of the utilization of the quadratic converter compared to a standard one.

	FAULT ANALYSIS AND FIELD EXPERIENCES OF CENTRAL INVERTER BASED 2 MW PV PLANT By Boris DUMNIC	[View] [Download]
Abstract: Reliability of photovoltaic (PV) components, systems and operation plays significant role in marketability of PV power plants. In that regard special attention should be given to the activities oriented at reliability improvement. Considering the quantity of parameters that could influence the operation of PV system, a number of different fault manifestations can be expected. The paper presents a classification of photovoltaic (PV) power system faults and has a root cause analysis oriented towards reliability improvement and thereby being able to reduce the overall capital and operational cost. The analysis is based on long-term field experience of operation and maintenance (O&M) of a central inverter based 2 MW PV power plant. Practical reliability improvement suggestions are also given.

	Novel DC to Single-Phase Isolated AC Converter using Coupled Inductor with Power Decoupling Capability By Nagisa TAKAOKA	[View] [Download]
Abstract: This paper proposes a novel active power decoupling converter topology, where additional components are not necessary in order to minimize the power decoupling circuit. In conventional EV/PHV battery charger systems with the power decoupling capability require several passive components and switching devices in order to absorb the power ripple at twice grid frequency. Thus, these topologies restrict the downsizing. In order to avoid the additional components for the power decoupling capability, this paper proposes the isolated DC to single-phase AC converter with an employment of a coupled inductor. This converter consists of a full-bridge inverter, a high frequency transformer and an indirect matrix converter in order to eliminate DC-link smoothing capacitors. Moreover, the additional inductor for the power decoupling circuit in the conventional topology can be substituted with leakage inductor of the coupled inductor in the proposed converter. In the proposed circuit, the coupled inductor is an isolation between the DC and the AC equipment for safety and the boost inductance. These characteristics result in a high-power-density converter. The validity of the proposed circuit is experimentally confirmed by a simulation and experiment at prototype. As a simulation result, the proposed method reduces the second-order harmonic of the power ripple by 97.5\% at 3-kW of the output power. As experimental results, the proposed converter reduces the DC current ripple generated by a single-phase AC load by 46.5\%.