METHOD AND DEVICE FOR CALCULATING POWER FLOW IN AC-DC LINK SYSTEM AND AC-DC LINK SYSTEM CONTROL SYSTEM

摘要

PURPOSE: To provide a method for calculating the power flow in an AC-DC link system receiving AC power and consuming it by DC power. ;CONSTITUTION: First, a rated value of a DC link point voltage is initialized (s101). Based on this link point voltage and a DC load, a DC system power flow is calculated to obtain a link point power flow and bus voltage (s102). Based on this link point power flow, a load of bus in an AC system link point, that is, a load in the DC system including a power loss of a converter 35, as viewed from an AC system, is calculated (s103). Based on this load and voltage in an AC link point set by an operating pattern or the like, an AC system power flow is calculated (s104). Link point voltage by a result of power flow calculation is compared with the DC link point voltage given in the s102 (s105), and when a deviation is a fixed value or more, the DC link point voltage is corrected to a value obtained in the s104 (s106), and correction in repeated untill changing the DC link point voltage is reduced.;COPYRIGHT: (C)1996,JPO