How to match the common-mode inductor parameters of the PCS output in an energy storage system?

Matching the common-mode inductor parameters of the PCS output is crucial for filter design. The following parameters need to be carefully matched:

1. Rated current: Must be greater than the effective value of the maximum output phase current, with sufficient harmonic margin.

2. Impedance characteristics: Must have sufficiently high impedance in the target suppression frequency band (e.g., 150kHz-30MHz). For example, the numbers in the CM-L series models represent the impedance value (ohms) at a specific frequency, and must be selected based on the noise spectrum.

3. Saturation current: Must be much greater than the peak value of any potential transient unbalanced current to prevent inductor saturation and a sudden drop in impedance.

4. DC resistance (DCR): Affects conduction losses and temperature rise; must be within the allowable range for system efficiency.

5. Self-resonant frequency: Should be higher than the highest noise frequency to be suppressed. When selecting a model, actual measured noise data should be considered to ensure that the inductor provides sufficient attenuation at frequencies exceeding the standard and to coordinate with the X/Y capacitors to avoid resonance peaks.