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This paper presents a mathematical analysis of a medium scale Photovoltaic (PV) power generation system connected to the distribution network and of its control system, in which the conversion stage is unique thanks to the absence of a boost chopper. Boost choppers are usually used as actuator for maximum power point tracking (MPPT). The conducted analysis leads to the conclusion that the used inverter...
This paper presents a real time operation of tap changing transformers and converters interfaced with distributed generators (DGs) in unbalanced three-phase distribution systems. The unbalanced three-phase power flow equations are solved using Newton Raphson method, and the three phase elements models are considered. Since the renewable energies are attracting worldwide attention, the DGs considered...
As a distributed generation system increases, a stable power supply becomes difficult. Thus control of power leveling (PL) unit is required to maintain the balance of power flow for irregular power generation. The unit is required to respond to change of voltage and bidirectional power flow. So the bidirectional buck/boost DC/DC converter is applied for the control of PL unit in this research. The...
The paper investigates the use of multilevel cascaded Z source inverter (MC-ZSI) for photovoltaic (PV) power generation system. The control of the proposed system will take into account the multilevel modulation scheme and the independent control of the shoot-through duty ratio of the connected Z source inverters (ZSI). In three phase three cells inverter, there exist nine independent shoot-through...
Smart house has to avoid interruption of power supply because power supply is more important for electrification house. Therefore, smart house needs uninterruptable power features. The proposed uninterruptable electrification smart house has seamless features for stand-alone mode, phase synchronization operation and grid-connected mode by phase synchronization control. Also, this smart house achieves...
Since the Great East Japan Earthquake, many people have been worried about power shortages in Japan. There has been more focuses to the save electricity at home. A method is very important that can reduce the energy requipment without any trouble to the home peopole. The spread of PV (Photovoltaic) will be expanded by the surplus power buyback institution, and Smart House with HEMS is expected to...
We propose a novel active islanding prevention method for large penetration of photovoltaic (PV) systems by detecting the harmonic impedance change, and have developed the simulation models for PV inverters which have new active methods by using PSCAD/EMTDC. We also study the performance of islanding detection functions in non detection zone (NDZ) by simulation analysis and clarify the effectiveness...
The purpose of this paper is to present a multi-inverter control technique to achieve fast dynamics and current sharing. The system is designed for back-up power system applications, especially for base station, etc. The multi-inverter system consists of one master module and several slave modules. The master module is with voltage and current control. The voltage controller is with proportional and...
This paper proposed a single-phase three-level inverter that has constant voltage constant frequency (CVCF) operation system. Harmonic analyses with linear and nonlinear loads have been realized to measure the robustness of the proposed technique. It has been shown that the proposed technique has 15% less harmonic distortion and better performance than the conventional inverter for the same load and...
Since the Great East Japan Earthquake, many people had been worried about power shortages in Japan. There has been more focus to installation of Renewable Energy Sources (RES). In Japan, PV system introduction is promoted by national policy of the government in 2012. However, the large amount of distributed generator causes voltage deviation beyond the statutory range in distribution system. Furthermore,...
In this paper, an optimal converter drive method for Permanent Magnet Synchronous Motor (PMSM) with a 3-level inverter is discussed in terms of loss minimization. The 3-level inverter can change an operation mode between two modulations namely, PWM and 1'pulse modulation at a decided point. In this paper, we discuss the interchange point for the two modulations subject to the total loss of PMSM drive...
This paper presents a comparative evaluation of four different multi-loop control schemes for a high-bandwidth AC power source. The power source considered in this work is based on a three-level T-type inverter with a two-stage LC output filter. The control schemes evaluated in this paper have an output voltage controller in the outer loop. For the inner control loop the following options are evaluated:...
In this study, simulation of the single phase grid interactive photovoltaic system is proposed. The proposed system consists of a maximum power point tracking boost converter and a grid interactive voltage source inverter. Interval type-2 fuzzy logic controller is used to track the maximum power point of photovoltaic arrays. Photovoltaic supplied DC electric energy is inverted to AC and imported to...
Multilevel inverters are emerging as a new breed of power converter options for power system applications. Recent advances in power switching devices enabled the suitability of multilevel inverters for high voltage and high power applications because they are connecting several devices in series without the need of component matching. Usually, a transformerless battery energy storage system based...
Recently, the market for renewable energy sources like wind and photovoltaic have been growing rapidly and the total installed power has the range of conventional power plants. This leads to a need for power flow control especially under certain conditions e.g. grid failures and voltage rise along the power line. What happens if the line voltage or the frequency increases due to an excess power supply?...
This paper presents a simple control strategy for a variable speed wind energy conversion system with a permanent magnet synchronous generator (PMSG). PMSG is connected to the grid through a switch mode rectifier and a voltage source inverter. The grid should be supplied by certain levels of powers for certain times from wind energy system according to a certain schedule. Batteries bank is connected...
This paper describes a simple grid current control method for the grid-connected operation, and inverter voltage control method based on the phase locked loop (PLL) for the intentional islanding operation at the three-phase grid-connected inverter. The PLL controller based on the pq theory with a simple P-controller is used to synchronize the phase of inverter output voltage with a grid voltage at...
This paper describes a high-speed switching technique of power MOSFETs applied to a chopper and a half-bridge inverter. The switching time must be shortened to operate power converters using the power MOSFETs at high-frequency, but parasitic output capacitance prevents the MOSFETs from turning off fast. In general, the turn-off time becomes longer as a load current is reduced because the reduced drain...
Photovoltaic (PV) systems are rapidly gaining acceptance as some of the best alternative energy sources. In installation area of large PV/battery system, it requires appropriate operation for example of a method considering power output fluctuation and insolation forecasts errors. In addition, it is better to minimize the size of battery and its capital cost. This paper proposes an optimization approach...
A new prototype of a secondary-side phase shifted (SPS) soft switching PWM dc-dc converter suitable for electric vehicle (EV) battery charging systems is presented in this paper. In the proposed dc-dc converter, soft switching commutations are achievable from full load to no load by utilizing parasitic inductances of the high frequency (HF) transformer. Beside that, no circulating current in both...
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