Analysis Of The Svc Voltage Control Principle And 500kv Ouhai Change Svc Reactive Power And Voltage Control Of The Feasibility Study,

With the rapid development of economy, the fast-growing load in Zhejiang power-system leads to the reactive voltage waving over its limit commonly, which becomes the major problem that may cause system instability and deterioration of voltage quality. In order to improve the voltage control techniques, an advanced scheme based on a thyristor-controlled FACTS device— —namely SVC is introduced in this thesis. The SVCs are so effective that they have been used widely and likely to be selected for new applications.This thesis is focused primarily on various components of SVC control and protection systems, as well as the operating principles and the control techniques of voltage regulation for SVC's controllers. The thesis also discusses the SVC's configurations and the operation conditions in the background of the so-called OUHAI substation project in WenZhou, analyses the voltage-control functions of the SVC in OUHAI, such as enhancement of power-system stability ect, and compare its performance and expense with a conventional synchronous condenser.The thesis is organized in 5 chapters, as follows:Chapter 1 describes the overview of the reactive voltage situation in Zhejiang power-system in 2002 and analyzes the corresponding problems existing in 2003, gives an advice that adopts SVC to improve the voltage control in the system.Chapter 2 explains the structures and the operating principle of three common kinds of SVC devices, including FC, TCR and TSC.Chapter 3 presents the details of various components of SVC control and protection systems of SVCs, such as measurement system, voltage regulator, gate pulse generator, synchronous system and supplemental control ect.Chapter 4 discusses the voltage-control functions of an SVC and illustrates the basic procedure for designing the voltage controller. This chapter provides an in-depth discussion of the several methods to improve SVC response .Chapter 5 discusses the feasible scheme that adopts an SVC to improve the bus voltage regulation in OUHAI substation, including its influence on WenZhou network, its configuration and operating condition in the application. This chapter also explains the integral VQC control strategy in which SVC is allotted priority. The comparison between a SVC and a conventional synchronous condenser is also made in respect of performance and expense.Several references are cited at appropriate locations for securing additional details or for pursuing further research.