Multituned filter design method for HVDC system
Multituned filter design method for HVDC system
 CN 105,576,662 B
 Filed: 10/30/2015
 Issued: 07/14/2020
 Est. Priority Date: 10/30/2014
 Status: Active Grant
First Claim
Patent Images
1. A method of designing a multituned filter for a hvdc system, the method comprising:
 selecting input parameters for the multituned filter;
setting a resonant frequency of the multituned filter;
calculating an inductance value and a capacitance value as filter parameters of a multituned filter based on the input parameters and a resonant frequency;
combining the resistance value with the filter parameter and calculating a price from the combination; and
when the calculated price falls within a predetermined price range, storing a combined value of the resistance, the inductance and the capacitance,setting a minimum resistance and a maximum resistance of the resistance values in consideration of an amount of reactive power required for stabilization of a system or a load connected to the multituned filter, and designing the resistance values in consideration of the amount of reactive power for inductances and capacitances within a range in which filter impedances satisfy a predetermined threshold,the calculated price is calculated by considering the price and the number of the resistance, the inductance and the capacitance,the selecting input parameters for the multituned filter comprises;
selecting a first filtering frequency corresponding to the 11 th harmonic component and a second filtering frequency corresponding to the 13 th harmonic component;
the setting the resonant frequency of the multituned filter comprises;
setting the resonant frequency to a frequency range between the first filter frequency and the second filter frequency;
the method further comprises the following steps;
recalculating values of the inductance and the capacitance when the calculated price falls outside a predetermined price range; and
after storing the combined values of the resistance, inductance and capacitance, an optimization taking into account the filter performance loss is performed,the performing optimization that takes into account filter performance loss includes;
calculating a first objective function related to the price of each element corresponding to the combined value of the resistance, the inductance and the capacitance;
calculating a second objective function representing a performance loss of the element;
selecting weights for the first objective function and the second objective function; and
the suitability of the objective function integrated by the weights is evaluated.
Chinese PRB Reexamination
Abstract
The present invention proposes a method of designing a multituned filter (MTF) for a High Voltage Direct Current (HVDC) system, the method comprising selecting input parameters for the MTF, setting a resonance frequency of the MTF, calculating an inductance value (L) and a capacitance value (C) as filter parameters of the MTF based on the input parameters and the resonance frequency, combining the resistance value (R) with filter parameters and calculating a price from the combination, and storing the combined value of R, L and C when the calculated price falls within a predetermined price range.
6 Claims

1. A method of designing a multituned filter for a hvdc system, the method comprising:

selecting input parameters for the multituned filter; setting a resonant frequency of the multituned filter; calculating an inductance value and a capacitance value as filter parameters of a multituned filter based on the input parameters and a resonant frequency; combining the resistance value with the filter parameter and calculating a price from the combination; and when the calculated price falls within a predetermined price range, storing a combined value of the resistance, the inductance and the capacitance, setting a minimum resistance and a maximum resistance of the resistance values in consideration of an amount of reactive power required for stabilization of a system or a load connected to the multituned filter, and designing the resistance values in consideration of the amount of reactive power for inductances and capacitances within a range in which filter impedances satisfy a predetermined threshold, the calculated price is calculated by considering the price and the number of the resistance, the inductance and the capacitance, the selecting input parameters for the multituned filter comprises; selecting a first filtering frequency corresponding to the 11 th harmonic component and a second filtering frequency corresponding to the 13 th harmonic component; the setting the resonant frequency of the multituned filter comprises; setting the resonant frequency to a frequency range between the first filter frequency and the second filter frequency; the method further comprises the following steps; recalculating values of the inductance and the capacitance when the calculated price falls outside a predetermined price range; and after storing the combined values of the resistance, inductance and capacitance, an optimization taking into account the filter performance loss is performed, the performing optimization that takes into account filter performance loss includes; calculating a first objective function related to the price of each element corresponding to the combined value of the resistance, the inductance and the capacitance; calculating a second objective function representing a performance loss of the element; selecting weights for the first objective function and the second objective function; and the suitability of the objective function integrated by the weights is evaluated.


2. The method of claim 1, further comprising resetting the resonant frequency when the calculated price falls outside a predetermined price range.

3. The method of claim 2, further comprising, after resetting the resonant frequency, recalculating values of the inductance and the capacitance based on the reset resonant frequency.

4. The method of claim 1, further comprising, after storing the combined values of resistance, inductance, and capacitance:

calculating single harmonic components or total harmonic distortion of the values of the resistance, inductance and capacitance; and it is determined whether the calculated individual harmonic components or total harmonic distortion satisfy an allowable value.


5. The method of claim 4, further comprising connecting a load or system based on a combined value of resistance, inductance, and capacitance when the calculated single harmonic component or total harmonic distortion satisfies the allowable value.

6. The method of claim 4, further comprising changing a combination of combined values of resistance, inductance, and capacitance when the calculated single harmonic component or total harmonic distortion does not satisfy the allowable value.
Specification(s)