How to handle EMC issues when multiple frequency converters are connected in parallel?

Addressing EMC issues when multiple frequency converters operate in parallel requires considering mutual interference and system-level coordination. When multiple units are connected in parallel, noise from each converter may couple through the power grid, grounding system, or space, resulting in superposition or new resonances. Remedial measures include: configuring each frequency converter with an independent input EMI filter to prevent noise crosstalk through the power grid; optimizing system grounding by connecting all frequency converter grounding terminals to a common grounding bus via low-impedance conductors to achieve equipotentiality and reduce interference caused by ground potential differences; maximizing the installation spacing between parallel frequency converters in the layout, or adding metal partitions between them; keeping output cables separate and avoiding bundling to reduce magnetic field coupling; considering using different carrier frequencies to stagger operation to avoid complete overlap of noise spectra, but attention must be paid to potential beat noise; for systems with a common DC bus, the filtering and wiring of the DC bus require special design to prevent noise propagation through the bus; and conducting system-level EMC testing to assess the overall interference level and specifically enhance filtering or shielding. Audiotech Electronics can provide high-power filters and grounding solutions suitable for parallel systems.