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Parameter Estimation of Dynamic Load Model in Power System by using Measured Data
Tomoda, Michiya,Matsuki, Junya,Hayashi, Yasuhiro The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.2
In this paper, we propose a dynamic load model considering change of flux inside induction motor for transient stability analysis and we present a new method for estimating unknown parameters of the dynamic load model. The model is a parallel composite of a constant impedance load and an induction motor load behind a series constant reactance. An adequate dynamic load model is essential for evaluating power system stability and this model can represent the behavior of actual load by using appropriate parameters. However, the problem of this model has a large amount of parameters and it is not easy to estimate a lot of unknown parameters. Therefore we propose an estimating method based on Particle Swarm Optimization (PSO), which is a non-linear optimization method, by using measured instantaneous voltage sag data. We estimated parameters of the actual load by PSO to minimize error between calculated and measured power of load after a load drop due to voltage sag by the accident. It was confirmed that the proposed method was successful and PSO is effective in parameter estimation.
Building Mathematical Model of Campus through Measurement Data
Kashihara, Hironori,Taoka, Hisao,Matsuki, Junya,Kawasaki, Shoji,Matsuura, Kousuke,Funabashi, Toshihisa The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.2
In this paper, we proposed the mathematical model of campus by measurement data and theoretical approach. We measure dynamic characteristic and static characteristic of load in a system. Power capacitors in the university are assumed to be electric power customer's load. The load model is presumed by combining them and the linear model calculated theoretically. The line voltage and the line current are measured, and we calculate the line load capacity in distribution system of campus. The load fluctuation of distribution system during a day is observed. The load will be modelized by evaluating a lot of data. We can forecast the demand of electric power by few information that is the load model and the measurement data of receiving end.
Hanai, Yuji,Yoshimura, Kazuaki,Matsuki, Junya,Hayashi, Yasuhiro The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.1
In recent years, Photovoltaic generation (PV) has gained a lot of attention due to its potential for contributing to part of the solution to global warming. In addition, the introduction of PV increased rapidly in many houses. If PV is introduced on a large scale, this may cause the allowable voltage produced by each customer to increase thereby deviate the allowable voltage. The installation of a storage battery can decrease the PV's output and control power surges. However, there are serious problems in respect to the installation cost and storage space of batteries. Therefore in this research, the authors propose and verify a new coordinated control method of heat-pump water heaters and electric vehicle battery chargers in a residence with a PV system. The proposed method compensates for the voltage rises and drops deviating from the allowable range by coordinated control of heat-pump water heaters and electric vehicle battery chargers. In order to verify the proposed method, an experimental simulation using an analog type distribution system simulator is carried out.
Hanai, Yuji,Yoshimura, Kazuaki,Matsuki, Junya,Hayashi, Yasuhiro The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.2
This paper proposes a new load management method using Heat Pump Water Heater (HPWH) and Electric Vehicle Battery Charger (EV-BC) in a distribution system with a high penetration of Photovoltaic generation system (PV). The proposed method implements a classification of the controllable loads (HP-WH, EV-BC) by distribution section and optimizes operation modes of the classified controllable loads. A distribution section enclosed with two or three IT switches, which are sectionalizing switches with sensors, is defined as a load management cluster, and a large number of controllable loads in a distribution feeder are classified into three clusters. All the customers with controllable loads determine beforehand two operation modes which achieve the satisfactory convenience and energy conservation; one is a nighttime consumption pattern and another is a daytime consumption pattern. Distribution System Operator (DSO) can collect the customers' information such as address codes and operation plans, and select either of the operation modes in each distribution section. The optimal combination of these operation modes is determined by Optimal Power Flow calculation (OPF). The objective is to improve load factor while keeping a power quality of a distribution system. The validity of the proposed method is verified through computer simulations using distribution network model.
Tanaka, Motohiro,Kawasaki, Shoji,Taoka, Hisao,Matsuki, Junya,Hayashi, Yasuhiro The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
In recent years, the debasement of the power quality of a distribution system such as deterioration of voltage imbalance and current imbalance or the increase of harmonics has been apprehended with diversification of the load by progress of power electronics technology and with increase of the amount of connection of a distributed generators for home use with the reduction of the effect on the environment. In this paper, the authors propose the restraint method of harmonics and improvement of voltage imbalance in distribution system utilizing the power conditioner systems of photovoltaic systems and verify the validity of the proposal method by the numerical calculation using an analytical model of distribution system.
FRT Control Method Including Islanding Detection in PCS Model for Photovoltaic Generation
Miyazaki, Takahiro,Cheng, Wai Tatt,Yoshimura, Kazuaki,Taoka, Hisao,Kawasaki, Shoji,Matsuki, Junya The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
In this study, we made experiments by the simulated PV system for understanding the cause of disconnection when instantaneous voltage sag occurs. Moreover, it is understood that the PCS with the voltage phase jump detection method which is one of the main causes of the disconnection. We modeled it in the simulation. When fault occurs, even though the residual voltage is more than 20 % and the voltage sag time is within 1.0 sec, the PCS disconnected by the voltage phase jump detection was confirmed in the simulation results. If a large number of PV systems are interconnected in the power system, we verified through the simulation that the interaction caused by the disconnection which generated by the voltage phase jump detection. We proposed threshold limit value of islanding detection. The validity of proposed method was verified through the simulation in this study.