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Senjyu, T.,Datta, M.,Yona, A.,Chul-Hwan Kim IEEE 2009 IEEE transactions on energy conversion Vol.24 No.2
<P>In this paper, a minimal-order observer-based control method is proposed for small power utility connected photovoltaic (PV) systems. In the proposed method, the PV power is controlled according to load variation to minimize the frequency deviation. Load power and diesel power are estimated successfully by a minimal-order observer. From the estimated load power, load variation index is calculated. A second-order low-pass filter is used to produce PV base power from available maximum PV power. Then, the PV base power is added with the load variation index to generate the command PV power. The proposed method is compared with the method where maximum power point tracking control is used to produce the command PV power. From simulation results, it has been found that the proposed method is effective to reduce the frequency deviation of the utility and also delivers PV power near maximum PV power.</P>
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Senjyu, Tomonobu,Shirasawa, Tomiyuki,Uezato, Katsumi The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point. To overcome this problem, we have developed an algorithm that will estimate the duty ratio corresponding to maximum power operation of solar cell. The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum. For the estimation, we have used the well know Lagrange's interpolation method. This method can track maximum power point quickly even for changing solar isolation and avoids oscillations after reaching the maximum power point.
Tomonobu Senjyu,Shingo Ashimine,Katsumi Uezato 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Using the disturbance and speed observers for controlling two-link robot arm is very useful. However, these observers have estimation error, the estimation error is a one of important issue for control performance or stability of the system. This paper presents the trajectory control method considering the estimation errors. This proposed control scheme provides a class of controllers which can compensate the estimation error of observers. In order to verify the validity of proposed control scheme, simulation results are also presented.
SPEED CONTROL FOR ULTRASONIC MOTORS USING FUZZY ON-LINE TUNING SYSTEM
Tomonobu Senjyu,Yoshihiko Gushiken,Katsumi Uezato 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a speed control for ultrasonic motors using a PI controller and disturbance torque observer Since the PI gams and the observer's poles are generally fixed, the control performance deteriorates when the driving conditions vary much Therefore, we propose the speed control scheme that the PI gains and the observer's poles are adjusted on-line in accordance with the speed ripple using fuzzy reasoning.<br/>
PRECISE SPEED CONTROL OF ULTRASONIC MOTORS BY REPETITIVE CONTROL WITH FUZZY REASONING
Tomonobu Senjyu,Hiroshi Miyazato,Katsumi Uezoto 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Ultrasonic motor is a new type motor and it has many useful features. This motor, however, has large speed ripple which arises from inherent natures caused by its driving principle and structure, and it is a significant problem in view of precise speed control. In this paper, we pay attention to periodicity of the speed ripple and reduce the speed ripple by repetitive control with variable learning factor based on fuzzy reasoning. The effectiveness of proposed control scheme is demonstrated by experiments.
Tomonobu Senjyu,Akihiro Omoda,Katsumi Uezato 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
Machine parameters need to measure in advance for vector control and theoretical analysis Therefore, we present the machine parameter measurement scheme, considering stator iron loss, by the single-phase test at standstill condition Using this method, the d-q axis inductances and the equivalent iron loss resistance in the voltage equation considering stator iron loss are easily measuied This method is simple and does not need to use complex theory and expensive equipment.<br/>
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Tomonobu Senjyu,Tomiyuki Shirasawa,Katsumi Uezato 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point To overcome this problem, we have developed an algorithm that will estimate the duty ratio corresponding to maximum power operation of solar cell The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum. For the estimation, we have used the well know Lagrange's interpolation method. This method can track maximum power point quickly even for changing solar isolation and avoids oscillations after reaching the maximum power point.
Position Sensorless Control for Ultrasonic Motors Based on Input Voltage Information
Tomonobu Senjyu,Tomohiro Yoshida,Naomitsu Urasaki,Katsumi Uezato,Toshihisa Funabashi,Hideomi Sekine,S. K. Panda 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a method of position sensorless control of ultrasonic motor (USM). The rotor position of USM is estimated based on the input voltage information. The characteristic of input voltage versus rotor position is expressed by a quadratic function. Since the parameters of quadratic function are adjusted by using recursively least square method, estimated rotor position agrees well with actual rotor position against load torque and motor temperature changes. Position sensorless control is achieved by using estimated rotor position instead of measured rotor position. The validity of the proposed method is confirmed by experimental results.
A Coordinated Control Method for Leveling Output Power Fluctuations of Multiple PV Systems
Tomonobu Senjyu,Manoj Datta,Atsushi Yona,Hideomi Sekine,Toshihisa Funabashi 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
A Photovoltaic (PV) system’s power output fluctuates with the change of weather conditions. Frequency deviations, tie line voltage fluctuations etc. are caused by fluctuating PV power when large PV power from several PV systems is penetrated in the utility. In this paper, to overcome these problems, a simple coordinated control method for leveling the fluctuations of combined PV power from multiple PV systems is proposed. Here, output power command is generated in two steps: central and local. Fuzzy control is used to generate the central leveling output power command considering insolation, variance of insolation and absolute average of frequency deviation. In local step, a simple coordination is maintained between central power command and local power commands by producing a common tuning factor. Power converters are used to achieve the same output power as local command power employing PI control law for each of the PV generation systems. The proposed method is compared with the method where conventional Maximum Power Point Tracking (MPPT) control is used for each of the PV system’s power output. Simulation results show that the proposed method is effective for leveling output power fluctuations and feasible to reduce the frequency deviations of the power utility.