Klaus Renz

Static Var Generators with GTOS for Innovative Windfarm Operation

Abstract Wind energy is one of the leading renewable energy technologies for the generation of electricity. Electrical energy may be generated over a wide range of operating conditions, particularly if far more than one windturbine is connected to the network. Low electrical energy production in one part of the windfarm may occur with high production in another part together with highly variable reactive power consumption from the system. A GTO-based Static Var Compensator also called Static Var Generator (SVG) or STATCOM is used in the Rejsby Hede Windfarm in Denmark for dynamic reactive power compensation and voltage limitation when islanding occurs. This paper describes the design aspects and studies, the converter technology and the control and protection schemes of this first application of SVG technology for windfarm operation. The installation will go into operation in 1997.

Power Electronic Equipment for Increasing Capability of Transmission Links in Interconnected Power Systems

Abstract Power Electronic Equipment (FACTS) have been developed and used as economic and efficient means for solving problems arising in full utilization of the capacity of long, heavily loaded interconnected AC transmission systems and in scheduled transferring power between subsystems. Focused on improving the system stability and enhancing the transfer capability of interconnected systems with long transmission links, various FACTS devices, such as HVDC, SVC, TCSC and STATCON as well as UPFC are described in this paper. Based on a simple interconnected system with long transmission links, the effects of different FACTS devices: HVDC, SVC and TCSC are as example demonstrated at transient conditions.