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Application of RSVG in railway 27.5kV system-- Liujiagou of Shenshuo Railway

Railway locomotive is a single-phase load, which is usually connected to the three-phase power grid by VV transformer. When the locomotive is running, it will produce a lot of negative sequence current inputing into the power grid, and the locomotive traction converter adopts phase controlled rectifier technology, which will produce serious odd harmonics.

The chain SVG with delta connection can effectively control the unbalanced load of 27.5kV railway system based on Steinmetz balance compensation theory, and the harmonic generated by the load can be filtered based on active filter technology.

Compensation effect:

Related case

Typical application of RSVG in suppression subsynchronous oscillation in railway system -- Bombardier Qingdao Sifang

Qingdao Sifang Bombardier Railway Transportation Equipment Co., Ltd. (BST) was established in 1998. It is a Sino-foreign joint venture funded by China Sifang locomotive and Bombardier company. Its main products are high-speed railway and EMUs. (1) The parameters of test power supply in the plant area of Qingdao Sifang Bombardier railway transportation equipment Co., Ltd. are as follows: rated voltage: 27.5kV, rated capacity: 10MW (2) problem description: when eight CRHiEMUs were tested with pantograph rising at the same time, serious subsynchronous oscillation began to appear in the 27.5kV power grid, which led to the blocked pulse of all trains and could not operate normally. The figure below shows the voltage and current waveforms at 27.5kV side of eight test locomotives, and the voltage and current have serious subsynchronous oscillation problem. We know from the data after current FFT analyzing , the main harmonic components are 45 Hz and 55 Hz.