SVC Application Study In The City Grid

In the building and running process of our nation’s power grid, some part of power grid’s constitution is relatively weak, the storage component of power generation device is relatively low, and the system is running under heavy load condition. As a result, a number of problems are brought about. One problem is voltage collapse or blackout caused by unsteady voltage or partial load drop. The stability of power grid is related to supply of reactive power. Dynamic reactive power compensation technique is a effective and inexpensive method to improve the stability of grid’s voltage, and it is the objective need to promote the security and stability of power grid as well as to improve strategic defense.Configuring SVC in the right place can boost the effect on improving voltage stability. Therefore, it is necessary to do some research on SVC allocation.Voltage collapse accidents occur frequently. It has attracted the attention of electricity workers and promoted the study of voltage stability problems. And the voltage stability problem has become almost an independent field of study. This paper describes the mechanism of voltage instability explanation, voltage stability and voltage stability mathematical model analysis methods. And it focuses on the application of sensitivity indicators and time-domain simulation method in voltage stability analysis. Our purpose of this research is to find the weak points of power grid and adjust the voltage at weak points.As a member of the FACTS, SVC can be used to support voltage and compensate reactive power. Static var compensator (SVC) has a transient stability control function. And it is possible to adjust the reactive power quickly and flexibly. Its main objective is to control the system bus voltage. In this paper, some research have been done about the working principle, operating characteristics, voltage regulator and control characteristics of SVC. It focuses on the operational characteristics and control features of FC-TCR.The Great Hing’an electric network which belongs to a ring network structure is weak and lack of reactive power. We consider both the voltage sag rate sensitivity index and the voltage sag time duration sensitivity index, then propose a new method of SVC allocation. We use the PSASP software to simulate the Great Hing’an electric network in the time domain in order to determine the optimal location and capacity of the SVC in practice. When the construction of grid is complex, it will take a lot of time for simulation in the time domain. This paper focuses on sensitivity analysis and the contribution from the SVC for solving the transient voltage sag problems and improving the transient voltage performances. And we use DIGSILENT software to do dynamic simulation about39-Bus New England power system. Then the location of SVC is determined. This simulation proves the feasibility of the method which is easy for calculation and application.