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Rail transit grid-connected inverter controller

The rail transit grid-connected inverter controller developed by the company adopts three-level modulation technology and four-quadrant control technology. Four-quadrant control technology allows energy to flow bidirectionally. When the locomotive starts, the grid-connected inverter works in the rectification state, draws energy from the power grid, assists the locomotive traction converter to provide traction energy together, reduces the voltage drop of the DC bus when the locomotive starts, and makes the locomotive start more stable. When the locomotive is braking, the grid-connected inverter works in the energy feedback state, which can directly feedback the energy generated during the braking of the locomotive back to the grid, the feedback efficiency can reach 98%, and synchronously track the frequency, amplitude and phase of the grid, the feedback voltage waveform is close to the sine wave, the total harmonic content is less than 3%, and will not cause pollution to the grid.

Because the grid-connected inverter adopts three-level modulation technology, compared with the two-level modulation technology, the output voltage waveform is closer to the sine wave, and the harmonic content is greatly reduced, which can greatly reduce the front-end LCL filter volume, and is superior to the two-level modulation technology used by most companies at home and abroad in terms of cost and reliability. The design standard of this product has reached the advanced level of similar international products, and the design performance index has reached the leading level in China.

Seeking the cooperation of manufacturers with relevant qualifications in the country, we provide mature technology, jointly promote the quantification of products, and achieve win-win situation.