The Study On The Control Of Superconducting Magnetic Energy Storage

Superconducting magnetic energy storage (SMES), which combines the advantages of superconducting magnet and power electronic converter, is a new kind of Flexible AC Transmission System (FACTS) elements. As an important part of the superconducting power system, this equipment can store energy with the fast response and enhance system transient stability which has been commercially realized abroad. Considering the fast development of the domestic grid and the new technology of the world grid, the research of SMES should be improved greatly. This thesis is devoted to the studies on SMES covering the issues of the modeling, the control strategy design and the coordinated control. Firstly Chapter 1 gives the significance of applying SMES, especially for power systems and an overview of the development of SMES.The appropriate mathematical model for the simulation is extremely important. For the simulation of the transient stability, the model of SMES is gotten using state-space equation in Chapter 2. According to this model a system simulation platform is built using Matlab.Then improving the SMES'characteristic tow controls are designed in Chapter 3. Adaptive PID controller is designed for SMES, identifying the system's special parameter with diagonal recurrent neural network (DRNN). The Proposed controler can minimize the error of the closed-loop system, without the system's model. The simulation results illuminate that the controller with the studying-self algorithm makes the out of the system better compared with PID controller. Another control approach based on the transient energy of the system is designed. The transient energy of the system is suit for the input of control, including the information of the stability. The transient energy control (TEC) is effective to enhance the stability of power system and to improve the regulation of the generator terminal voltage.Under the research of the coordinated control in the complex power system, Chapter 4 gives the analysis of the coordinated control between SMES and the traditional equipment. The coordinated control could improve the control of SMES and increase the operation efficiency.At last, a prototype of SMES unit with its control system is realized and tested in a power system dynamic simulation laboratory environment. Some experiments are carried out to study the characteristics of the prototype device and the ablility controlling the fault oscillation. Results obtained from the laboratory environment verify the correctness of the simulation results.