Research On Fixed Capacity Location Of Multi - Type FACTS

The electric power system is developing towards the direction of large capacity units, high voltage systems and Long-distance transportation. FACTS has also wound their way into the stage of history. It can solve many problems which can not be solved by traditional mechanical devices, And the control of FACTS is more flexible and rapid. FACTS plays a powerful complement and an effective support role of the future power grid, has become one of the important development trend of future power system, but also a hot issues of the present study. After the installation of FACTS devices in power system, FACTS is able to provide effective support for power system and improve the operation level of the system, including improving the stability of the static voltage, improving the transmission capacity of the line, improving the quality of the power, restraining the low frequency oscillation and so on. But when the installation location and the installed capacity of FACTS devices is unreasonable, It may cause the waste of investment, even can produce a series of negative effects on power system. So it is very necessary to optimize the location optimization method of the FACTS devices.Research on optimal allocation of the FACTS devices is under determined system connection and operation mode. Studying on the FACTS devices of the optimal access location and network capacit and enable it to maximize the performance indicators of distribution system. In this paper, we first introduce the types and principle of FACTS devices. We choose SVC and TCSC as the research object, which were widely applicated in China’s power grid. We study the model of them and their respective functional properties. SVC can improve the node voltage stability margin degree. TCSC can improve transmission capacity of pover system. By using the improved continuous power flow method and the modal analysis method, the voltage stability margin and the line participation factor can be obtained, and the optimal access points of SVC and TCSC can be determined.From the view of an economic point and reliability, we put forward the objective function that maximizing the system static voltage stability margin and minimizing total cost of investment. And combined with the generator and the node voltage, current, FACTS device installed capacity, line transmission power and other constraints. Set up the mathematical model of optimal allocation of FACTS devices. Make the improved evolutionary algorithm as the optimization algorithm of the FACTS devices. The mathematical model and optimization algorithms for the optimization configuration have been tested on the system of IEEE-39 nodes. The transient risk analysis of a group of similar solutions is obtained. Finally select an optimal scheme. The indicators were compared before and after optimization, including static voltage stability margin, loading rate of transmission line, bus voltage and transient stability risk, verified the optimization model and the optimization algorithm used in this paper is effective and advanced.from all aspects.