Multi-unit alternating-current low-pass device for thermal power plant

The utility model discloses a multi-unit alternating current low-pass device for a thermal power plant, which comprises a shell, an alternating current inlet wire main circuit breaker, a branch circuit breaker, a plurality of power modules, a direct current output terminal strip and a direct current output circuit breaker are arranged in the shell, and the direct current output terminal strip comprises a confluence terminal strip and a primary output terminal strip; the alternating-current inlet wire main circuit breaker, the branch circuit breakers, the power modules, the convergence terminal strip, the direct-current output circuit breakers and the primary output terminal strip are sequentially connected through wires. According to the utility model, the use requirements of a thermal power plant of a coal feeder or an air pre-heater frequency converter can be met, and a plurality of PM power module units are arranged in one screen cabinet in the main loop part, so that the on-site occupied area is effective