The active power control in the high-voltage dc transmission of electricity system

摘要

(57) Abstract The high-voltage dc transmission of electricity system, through direct current link (W1 and W2), it possesses the 1st and 2nd transformer substation (STN1 and STN2'') which is connected mutually, each transformer substation has the voltage source converter (CON1 and CON2). The 1st transformer substation possesses the 1st voltage measurement expedient (M5) in order to measure direct current voltage (Udc1) and the control means in order to control direct current voltage. The 2nd transformer substation possesses the active power control means (PRREG) which control active power flow (P2) on the basis of reference value (P2R and f₂ R). The aforementioned variable voltage control expedient controls the direct current voltage of the 1st transformer substation measurable quantity every of time of the aforementioned direct current voltage on the basis of only the 1st voltage reference value (Udc1R) which, corresponds to that active power of the 1st transformer substation variable voltage control in independence. The aforementioned 2nd transformer substation possesses the 2nd voltage measurement expedient (M6) in order to measure direct current voltage (Udc2). Power control expedient possesses the variable voltage control expedient (UdcREG) which controls the direct current voltage of the 2nd transformer substation direct current voltage of the time which was measured and on the basis of with 2nd voltage reference value (Udc2R), aforementioned 2nd voltage reference value 3rd voltage reference value (Udc2R'') and is drawn up the 2nd transformer substation on the basis of the voltage reference correction signal (UdcR) and the reference value (P2R and f₂ R) which are based on the value (P2 and f₂) which displays the active power which flows.