Junnosuke Haruna

Modified maximum power point tracking technique based on fixed frequency model predictive control for PV applications

A novel Maximum Power Point Tracking Technique (MPPT) based on Fixed Frequency Model Predictive Control (FFMPC) for Photovoltaic (PV) is developed through this paper. The Proposed control system consists of two-stage. The first stage is a Modified Incremental Conductance (MIC) algorithm and the second stage is FFMPC. The proposed control system has some inherent features such as fast MP tracking under different environmental conditions, working at fixed frequency, and this gives the advantages of controlling the output quality and EMI, and smaller transient time. Switched Inductor Quadratic Boost Converter (SIQBC) is used as an interface stage for MPPT. SIQBC has very high gain with acceptable efficiency.

Novel Predictive Maximum Power Point Tracking Techniques for Photovoltaic Applications

This paper offers two Maximum Power Point Tracking (MPPT) systems for Photovoltaic (PV) applications. The first MPPT method is based on a fixed frequency Model Predictive Control (MPC). The second MPPT technique is based on the Predictive Hysteresis Control (PHC). An experimental demonstration shows that the proposed techniques are fast, accurate and robust in tracking the maximum power under different environmental conditions. A DC/DC converter with a high voltage gain is obligatory to track PV applications at the maximum power and to boost a low voltage to a higher voltage level. For this purpose, a high gain Switched Inductor Quadratic Boost Converter (SIQBC) for PV applications is presented in this paper. The proposed converter has a higher gain than the other transformerless topologies in the literature. It is shown that at a high gain the proposed SIQBC has moderate efficiency.

Considerations of the influence of secondary-side converter type and of the primary-side inverter input voltage on the efficiency of inductive power transfer system

When an inductive power transfer system is applied to a battery charger for electric vehicles, a diode bridge rectifier with a dc-dc converter, called a secondary-side converter in this paper, is connected to the secondary side of the resonant circuit in order to regulate the current and voltage of battery. At that time, a type of the secondary side converter and an input voltage of the primary-side inverter affect the efficiency of the whole system. Therefore, this paper investigates the influence of secondary-side converter and the primary-side inverter input voltage on the total efficiency of the system by experiments and theoretical analysis.

Novel fixed frequency predictive hysteresis maximum power point tracking control for photovoltaic applications

A novel Maximum Power Point Tracking (MPPT) control for Photovoltaic applications is proposed in this paper. The proposed control algorithm is two-stage control system. The first stage is a Modified Incremental Inductance (MIC) algorithm and the second stage is based on Fixed Frequency Predictive Hysteresis Control (FFPHC). The purpose of the MIC stage is to generate the required reference current that achieves the maximum power. And the function of the FFPHC is to force the system to track that reference. The proposed control algorithm has some inherent features such as ability to achieve maximum power even in case of rapid environmental changes, ability to achieve maximum power in case of partial shading. Operation of predictive hysteresis control at fixed frequency gives the advantages of better power stage parameters design and enables controlling the switching losses.

An efficient MPPT technique with fixed frequency finite-set model predictive control

This paper proposes Fixed Frequency Model Predictive Control (FFMPC) based MPPT algorithm and SIQBC for PV Applications. The proposed control algorithm consists mainly from two stages, the first stage is a modified Incremental Conductance (IC) algorithm and the second stage is a modified fixed frequency model predictive control. The proposed MPPT algorithm has a fast response, able to extract maximum power under different environmental conditions, reach to steady state faster than traditional IC algorithm and it operates at fixed switching frequency. The proposed algorithm has the advantages of fast tracking, fixed switching frequency and less ripple at Maximum Power Point (MPP). The proposed algorithm was implemented and applied on high gain Switched Inductor Quadratic Boost Converter (SIQBC). As described and illustrated on the experimental results, the proposed algorithm can track the maximum power in very small time, even in case of fast environmental change. The proposed algorithm is presented using PE Expert III.

Pseudo single stage flyback current source inverter for grid connected PV applications

Pseudo single stage flyback current source inverter designed for photovoltaic applications is presented in this paper. The proposed inverter consists of flyback current source converter and h-bridge unfolding stage. The proposed system is intended to do the following functions: extract maximum power for the Photovoltaic (PV) module, inject a sinusoidal current into the grid. Flyback converter is designed to operate in Discontinuous Conduction Mode (DCM), the purpose of DCM operation is to inject a sinusoidal current into the grid without measuring the grid current. Rectified sinusoidal modulation is used to control the flyback converter switch. The purpose of this modulation strategy is to let the output of the flyback converter current to be a rectified sinusoidal waveform. H-bridge unfolding stage is used to convert the rectified current at the fundamental frequency of the grid voltage to full sinusoidal current. All switches of the h-bridge unfolding circuits are operating at fundamental frequency of the grid. Operating at fundamental frequency reduces the switching losses of the h-bridge inverter to be approximately zero.

High gain inverter based on the 3S inverter with model predictive control for PV applications

This paper presents two-stage power conditioning system for grid integrated Photovoltaic (PV) applications. The proposed system has distinct feature such as: high voltage gain, high efficiency, low voltage stress and galvanic isolation. The system is controlled via Model Predictive Control (MPC) to do the following functions: extract maximum power from the PV generator, and inject a sinusoidal current into the utility with unity power factor.

An optimized switching pattern for reducing input current distortion of matrix converter using space vector modulation

This paper discusses an optimized switching pattern for reducing an input current distortion of a matrix converter using a space vector modulation. The matrix converter has 27 instantaneous output voltage / input current patterns. In order to keep low input current distortion, the matrix converter always must select optimized switching pattern. A space vector modulation is one of solution of these problems because the space vector modulation can visualize the switching patterns and can easily consider a mechanism of an operation of the matrix converter. In this paper, all selectable switching patterns are analyzed to reduce the input current distortion. After that, a relationship among effective switching patterns, an input voltage phase, an input current reference and an output voltage reference are considered on the instantaneous space vector diagram. By using these analyses, this paper tries to discuss the theoretical optimized pattern for reducing the input current distortion of the matrix converter.

Z-source with voltage multiplication inverter for grid-tie photovoltaic applications

This paper proposes Z-source with voltage multiplication inverter for grid connected Photovoltaic (PV) application. The proposed scheme has two-stage. The first stage consists of Z-source with voltage multiplication converter. The proposed converter has high gain compared to other transformer less topologies and reduced voltage stress on the switch. The second stage assembled from five switch inverter. The purpose of the first stage is to boost the low voltage of the PV module to a voltage level suitable for grid connection and controls the PV modules at Maximum Power Point (MPP). The second stage used to convert DC voltage into AC voltage and inject sinusoidal current with unity power factor into the grid. Model Predictive Control (MPC) is proposed to control the proposed system. MPC has some inherent advantages such as fast tracking, very small settling time and ease of implementation.

Loss analysis and power improvement of non-resonant type capacitive power transfer system with three-level operation

The authors have proposed a new capacitive power transfer (CPT) system using one-pulse switching active capacitor (OPSAC). The proposed system improves transfer power without LC resonance so that it is robust against parameter change. The one of advantages of OPSAC is easy realization of cascade connection in order to enhance transfer power. In the past, CPT system with five-stage OPSAC was successfully realized, but the actual transfer power was smaller than theoretical power. In this paper, loss factor is analyzed using precise calculation model. In addition, from the results of loss analysis, it was clarified that the one of the main loss factor is diodes of rectifier so that the system using synchronous rectifier is also proposed for power improvement.