At present the electrical power system has growth and more complicate. Because of the development of the economics and society. An increasing the demand of power transmission line system would be resulted in the stability and reliability. The Flexible AC Transmission System devices: (FACTS) is the equipment which can control the flow of real power. In addition it can gladly encourage the stability and reliability of the power transmission line system. This research proposed the impact of placing power electronics device to increase stability and reliability of power system in order to study the impact of Flexible AC Transmission System devices: (FACTS) devices for the resulting to stability of power system. UPFC devices model which consisted of Static Synchronous Compensator and Static Synchronous Series Compensator that worked as independent voltage source for technique to proposed control the flow of real power and reactive power as well as voltage bus in power system. Testing Simulation power flow control of 5 buses by placing unified power flow control indicated the effective compensation of real power and reactive power in power system.

The aim of this research is to create the center of mass testing machine for vehicles with maximum mass 3000 kilograms. By the performance of this machine is able to determine the center of mass 3 axis by horizontal longitudinal and vertical. On the other hand the verities of mass from 50 to 100 kilograms and the several of weight distribution at horizontal and longitudinal are applied to the condition of testing for reasonable to the position of the center of mass. The result of research discovered to the performance of center of mass tester was activated following to test conditions. Furthermore the weight distribution at longitudinal was the highest effect to the horizontal center of mass. By the way the value of weight distribution at horizontal is more effects to the longitudinal center of mass. Moreover increasing of mass was impact to the vertical center of mass and it’s independent to the position of weight distribution.

The aim of this research is to study the varieties of weight density distribution affect to the center of mass and vehicle stability. The weight density distribution tester was designed and changed the position of mass. Base on the center of mass is main points of vehicle stability. On the other hand FMCSA standard was applied to field test for considering of the brake performance and vehicle stability. The results of research discovered to the mass distribution on longitudinal plane are affected to the center of mass and absolutely influence at the right wheel on the front axle. In term of the braking performance it’s depends on the lateral mass distribution especially the center position of mass installed on longitudinal and horizontal plane and close up on the front axle (Y2). For the vehicle stability results the position (Y2) is the highest influence for yaw rate and sideslip. Otherwise the position (Y3) or the position of mass installed on longitudinal plane and nearly at the left wheel on the rear axle. Additionally wheel lock-up condition was appeared on the front axle only. Because the behavior of weight distribution on the front axle was decreased lead to mass distribution on longitudinal plane.

The aim of this research is to study the brake proportional affected to vehicle stability. Braking performance and vehicle stability testing are the main of research purposes. Otherwise learning research center and new researcher in automotive engineering are the minor research objectives. The results of research discovered to the braking performance depend on driver behavior. By the minimum deceleration was appeared on the non-proportion in front axle with braking ratio 0:100. In term of vehicle stabilities yaw and pitch moment are normally occur by the driving behavior. But the sideslip is an absolutely effect to vehicle handling. With the braking ratio 100:0 there is the highest risk for controlling a vehicle cause of the wheels were locked-up condition in the rear axle. Therefore the value of the sideslip was exceeded with the criteria. Furthermore these project researches were got the learning research center and the new researcher in automotive engineering field.

Sidecars are one kind of vehicles which Thai peoples widely use and also be useful in daily life such as a commercial carrying and transport carrying. the purpose of this project is to increase more safety of carrying and utilization by reserching and developing the stability of sidecars. This approach is to use the 3rd phases set of width adjustable (confirm with legality) is composed first series of small phases second series of midium phases and third series of large phases in order to find each phases of the differences in the stability of sidecars. At the same time this experimentation occured the Pitch angle the Yaw Angel the Resistance in riding and brake and finally the speed of sidecar. Many conclusions are to get the most suitable stability of sidecars. Based on this methodology will be the most suitable stability of sidecars which can develop and design sidecars get more efficiency and capability of carrying later. The result of the stability sidecars testing in case of no carrying was found that increase of wheeltrack directly effects the Yaw Angel increased and conversely Sideslip angle reduced. In case of carrying with passengers was found that the increase of mass directly effected on the increasingly resistance of left hand and right hand. In case of commercial carrying that was similar to the testing carrying with five passengers due to the weight distribution got near to front wheels similarly was found that the increase of wheels base directly effected on the Sideslip angle increased and conversely the Pitch angle reduced. In case of commercial carrying which reduced the speed while cornering directly effected on the Sideslip angle reduced. For the bend testing by braking with the rear brakes and 1.1 m wheel track caused the Pitch angle the Yaw Angle and the Sideslip angle was less was found that was the most suitable stability of sidecars. And conversely for the bend testing by braking with the front brakes or braking with the front and rear brakes jointly caused the Pitch angle the Yaw Angle and the Sideslip angle was more was found that is not insecurity to keep the suitable stability of sidecars.