A static var generator (SVG) using self -commutated inverters of 8OMVA capacity was developed and successfully applied to an actual 154KV power system to stabilize the power system. The SVG consists of 48-pulse multiple inverters whereby GTO thyristors are applied. After installing it at a power system site, a field teat was conducted t o confirm the system stablizing effect. The test results displayed the expected performance, and the SVG was proved to be an effective power system stabilizer. This paper describes the outline of the 8OMVA SVG, technical features and the test results.

This paper deals with static var compensators using self‐commutated inverters (which is so‐called SVG) compared with conventional SVC and Rotary Condenser. Improvement of power system stability is explained by using simple system model and checked by dynamic digital simulation. In the latter part of this paper, system outline, basic specifications and control diagram of the SVG rated 154 kV, ±80 MVA, which has been installed at INUYAMA Switching Station, are briefly presented. Field tests at INUYAMA verify that power swing is effectively damped and transmission capacity is increased.

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A Static Var Generator (SVG) based on a self-commutated inverter using GTO thyristors has been newly developed. The size of the SVG used for improving power system stability will be as large as around 100 MVA. The technical subjects to be solved for developing such a large SVG are summarized as follows :(1) Compact design (2) Harmonic elimination by means of multiple transformer (3) Large inverter with series concection of GTO thyristors This paper describes the solutions to these subjects, especially the application of large number of multi-pulse connection and series connection of GTO thyristors, including the analysis of the basic performance of SVG and the multiple transformer. The test results of a 12-pulse partial model (8 MVA) and a 48-pulse miniaturized model prove the solutions proposed in this paper to be effective and reasonable.

A Static Var Generator (SVG) based on a self‐commutated inverter using GTO thyristors has been newly developed. The size of the SVG used for improving power system stability will be as large as approximately 100 MVA. The technical subjects to be solved for developing such a large SVG are summarized as follows: compact design; harmonic elimination by means of multiple transformers; and large inverter with series connection of GTO thyristors. This paper describes the solutions to these subjects, especially the application of a large number of multipulse connection and series connection of GTO thyristors, including the analysis of the basic performance of SVG and the multiple transformer. The test results of a 12‐pulse partial model (8 MVA) and a 48‐pulse miniaturized model prove the solutions proposed in this paper to be effective and reasonable.