Yaser Qudaih

Evaluation Study of an Isolated Power System Operation with PV and Electric Vehicle Integration

Introduction of natural energy power generators particularly, the introduction of the photovoltaic (PV) which can be almost installed anywhere and the rapid spread of the electric vehicle (EV) attracts wide attention. The main reason behind such a phenomenon could be the CO2 emissions mitigation requirements and global warming aspects. These distributed resources are useful for zero-emission power generations. However, most of those generations are useless when we have a blackout since they are disconnected by the loss of AC power. As an example distributed generators could not used during the blackout after the Tohoku big earthquake. Thus, if we have installing the independence outlet, we can supply power in emergency. According to this research, we can consider EV as a power storage facility in a form of mobile batteries. In this paper, the objective is to construct the isolated power supply system with inexpensive elements. Even if proposed system is isolated from power system, the system can supply stable power by PV and EV. Thus, this paper evaluates sustainability of the isolated power supply system experimentation.

Mega-Solar Power Modification by Using Controllable Distributed Generation

In the recent years, the utilization of natural energy sources such as wind power and solar power has been increased due to the global warming countermeasure as a main reason. This paper focuses on the capability of controllable distributed generation to be utilized in power modifications effectively. We evaluated Mega-solar power modification by using the controllable distributed generation as a main methodology for this work. A model based on real operation measurements has been developed to evaluate the concept of utilizing the distributed generation in a proper way and size to improve power quality. Results show that the concept is applicable and quit suitable to be applied in large scale power systems.

Construction of PV simulator by using geographic information system and digital surface model

This paper analyses and evaluates the amount of solar radiation based on Digital Surface Model (DSM) information by using Geographic Information System (GIS). This study has developed an apparatus to evaluate suitable places for Photovoltaic (PV) panel installation based on the amount of solar radiation analysis. In this study, the area of Kitakyushu city is selected to be evaluated by the proposed tool as an example in the sense that PV panels can be installed optimally. The results show that the proposed tool based on DSM information by using GIS can precisely determine the amount of solar radiation considering the solar orbit under the condition of no clouds, and evaluate an optimum location for PV installation. In the future the results can be applied to a PV power generation analysis after superimposing a present weather condition or weather forecasting data.

Development of Voltage Stability Analysis Tools in Matlab/Simulink Environment

This research intends to create an environment in which the voltage stability can be analyzed by plotting P-V curve. In the advancement and development in the power system analysis, a tool on Matlab/Simulink has been developed. It can look how stable the system can operate based on the voltage surface when the load increases at any node. By repeating the power flow calculations with Newton- Raphson method when the load increases, the upper level voltage of P-V curve can be calculated. However, using usual initial power flow calculation cannot compute both upper and lower level voltages of P-V curve; therefore special methods must be used. In this research, upper and lower level voltages of P-V curve can be calculated by initial power flow calculation where the load is represented as a constant impedance load. The developed environment is compared with a general power system analysis tool. In addition, the developed environment can be applied in designing FACTS devices. Results demonstrate the effectiveness of the proposed methodology.

Power System Stability Control Based on the Characteristics of the Observed Information via Excitation Control

This paper presents a method for tuning power system stabilizer (PSS) parameters to control low-frequency oscillations. The dynamics of low-frequency oscillations can be identified by wide area phasor measurements. Hence, the theory builds a low-order model that reflects the dynamics of the full system, based on observation components that are included in system oscillations. Since the model reflects the real structure of an excitation control such as PSS and Automatic Voltage Regulator (AVR), also it can tune AVR parameters at the same time. As a result, the PSS parameters tuning can damp effectively low-frequency oscillations.

Analytical Study of Wide-Area Power System Dynamics Based on P-delta Curve

During past years, power systems are continuously expanding with increasing electric power supplies and distribution systems. Accordingly, such systems might be subjected to power system instability depending on their system conditions. Therefore, we have installed Phasor Measurement Unit (PMU) in Japanese universities and constructed analytical system for the power system characteristics. This paper presents a synchronizing power monitoring system of wide-area power system using phase difference between Kitakyushu and Nagoya and tie line power flow measured by Kyushu Electric Power Company. By extracting wide-area oscillation, P-δ curve corresponding to the wide-area power system can be drawn. Furthermore monitoring the synchronizing power will be utilized an index of the stability of power system. Moreover, a drawing method for simplified P-δ curve which illustrate the state of stable equilibrium point of P-δ curve has been developed. As a result, wide-area system dynamics has been analyzed using the proposed methodology actively.