METHOD AND DEVICE FOR DETERMINING PARAMETERS OF A PASSIVE IMPEDANCE ADAPTER APPLICABLE TO VSC-HVDC

The invention discloses a method for determining a parameter of a passive impedance adapter applicable to VSC-HVDC, including the following steps: S1. obtaining a VSC-HVDC impedance, and obtaining a VSC-HVDC impedance curve X(ƒ) based on the VSC-HVDC impedance; S2. estimating an upper limit value of the main capacitor in the passive impedance adapter; S3. calculating an adapter parameter curve X(ƒ); S4. determining a value of the main capacitor and varying a value of the main resistor until min[X(/)- X(ƒ)] is maximized; determining whether min[X(ƒ)- X(ƒ)]>k holds; S5. If min[X(/)- X(ƒ)]>k does not hold, increasing the value of the main capacitor and performing steps S2-S4 until min[X(ƒ)-X(ƒ)]>k holds when the value of the main capacitor is within the range of the value of the main capacitor, storing the parameters in an available parameter set; S6. reducing the value of the main capacitor, and storing the parameters when min[X(/)- X(ƒ)]>k holds in the available parameter set; S7. selecting the available parameters from the available parameter set. The invention can realize the determination of the parameter of the passive impedance adapter, so that the positive impedance characteristic can be realized in the full frequency band of interest, and the risk of harmonic resonance is completely eliminated.